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1
Wen Jing, Dickson Fong, and Lau Teck Leong. "Effect of Aggregate Size on Punching Strength of Reinforced Concrete Slabs." Applied Mechanics and Materials 835 (May 2016): 450–54. http://dx.doi.org/10.4028/www.scientific.net/amm.835.450.
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This paper reports test results of flat slab cast from micro-concrete and normal concrete subjected to concentric punching shear. Although the punching shear failure mechanism of micro-concrete slabs was very similar to that of normal-concrete slabs, the punching shear capacity is reduced to about 73% due to the reduction in transferred shear stresses across shear cracks by aggregate interlock. Therefore, a shear retention factor of 0.7 is suggested to be applied in estimating the punching shear strength of micro-concrete slabs.
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Bujňáková, Petra, and Jakub Mečár. "Optimization of a flat slab with different type of punching reinforcement." Pollack Periodica 16, no. 1 (March 25, 2021): 52–57. http://dx.doi.org/10.1556/606.2020.00256.
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AbstractSeveral types of punching shear reinforcements are available for increase of the maximum resistance against punching shear failure of flat slabs. Conventional punching shear reinforcement in form of stirrups or double headed studs are in use for decades. They are well known due to their simplicity and good performance. A new type of punching reinforcement has been developed for the case, where the flat slab exposed to extreme load and resistance of conventional type of punching shear reinforcement is not sufficient. Another designs point out that new construction system can reduce the amount of CO2. This paper presents some results of parametric study focused on design of the flat slab using different types of punching shear reinforcement and considering the concrete consumption.
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PEREIRA FILHO, M. J. M., M. V. P. FREITAS, D. F. A. SANTOS, A. J. C. NASCIMENTO, and M. P. FERREIRA. "Slabs strengthened for punching shear with post-installed steel and CFRP connectors." Revista IBRACON de Estruturas e Materiais 12, no. 3 (June 2019): 445–78. http://dx.doi.org/10.1590/s1983-41952019000300002.
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Abstract Structural accidents due to punching shear failures have been reported in flat slab buildings. Design recommendations presented by codes can lead to entirely different punching shear resistance estimates for similar situations. Furthermore, design codes do not present guidelines for the design of punching shear strengthening of existing slabs. This paper uses a database with 118 experimental results to discuss the performance of theoretical estimates of punching shear resistance using ACI 318, Eurocode 2 and ABNT NBR 6118 in the case of slabs without shear reinforcement. Another database with results of 62 tests on slabs strengthened with post-installed steel and CFRP dowels is used to evaluate the performance of these strengthening techniques and to propose adaptations in codes to allow their use in punching shear strengthening situations of existing slab-column connections.
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Wu, Linfeng, Tiancan Huang, Yili Tong, and Shixue Liang. "A Modified Compression Field Theory Based Analytical Model of RC Slab-Column Joint without Punching Shear Reinforcement." Buildings 12, no. 2 (February 17, 2022): 226. http://dx.doi.org/10.3390/buildings12020226.
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RC slab–column structures are widely used because of the advantages of small space occupation for horizontal members, easy construction and good economy. However, slab–column joints are prone to punching shear failures, which deteriorates structural safety. This paper provides an analytical model to predict the punching shear capacity of the RC slab–column joint. A database of 251 test results is established for the shear punching capacity of slab–column joints without punching shear reinforcement. The performance of existing design codes in predicting the shear resistance of slab–column joints is investigated and compared based on the database. Then, based on the modified compression field theory (MCFT) model, an equation for calculating the punching shear resistance of slab–column joints without punching shear reinforcement is established. The prediction results of the analytical model are enhanced by using the regression analysis method. The model proposed in this paper is based on both reliable theoretical and the summary of a large number of test results, which has higher prediction accuracy than the design codes.
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Ahmed, Ebada, Boshra Eltaly, Fatma El-Zhraa, and Magdy Tayel. "Resisting punching shear stress in reinforced concrete slabs." MATEC Web of Conferences 162 (2018): 04025. http://dx.doi.org/10.1051/matecconf/201816204025.
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Punching shear failure is a major problem encountered in the design of reinforced concrete flat slabs. The utilization of shear reinforcement via shear studs or other means has become a choice for improving the punching shear capacity. In this study, a new alternative of reinforcement modalities were tested and demonstrated the effect of self-compact concrete on the punching shear capacity, beside that compared between the difference codes to identify the suitable one for determining the position of critical section of punching shear. Nevertheless, in this investigation, the proposed reinforcement system is examined for interior columns only. An experimental work consisting of six specimens: five of them were cast with normal reinforced concrete and one was cast with self-compact strength concrete. The obtained results indicate that the proposed shear reinforcement system has a positive effect in the enhancement of the punching shear capacity of interior slab–column connection of self-compact strength concrete.
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Majtánová, Lucia, Jaroslav Halvonik, and Ján Hanzel. "The Maximum Punching Capacity of Flat Slabs." Solid State Phenomena 259 (May 2017): 232–37. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.232.
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Two ways how to determine maximum punching resistance of flat slabs with shear reinforcement are currently used. The first way is verification of the concrete strut capacity at the column periphery defined as VRd,max. The second limit is defined as kmax multiple of the punching shear resistance without shear reinforcement VRd,c. The values of kmax are proposed usually in between 1.4 and 2.0. Results of the experimental tests are presented in the paper that were focused on above mentioned limits, whether failure of the struts can precede any other form of punching failure that is limited by kmax*VRd,c. Two experimental slab samples reinforced with high amount of shear reinforcement that increased punching capacity above capacity of the concrete struts were tested together with two slab samples cast without shear reinforcement. Comparison has shown that punching resistance of flat slab with shear reinforcement has been 1.7 times higher than resistance without shear reinforcement. While some standards allow for use kmax value of 1.9 in this case. This indicates that limits based only on the kmax factors may overestimate actual maximum punching shear resistance.
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Megally, Sami, and Amin Ghali. "Seismic behavior of slab-column connections." Canadian Journal of Civil Engineering 27, no. 1 (February 15, 2000): 84–100. http://dx.doi.org/10.1139/l99-052.
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Brittle punching failure of flat plates can occur as a result of transfer of shearing forces and unbalanced moments between slabs and columns. During an earthquake, the unbalanced moments transferred between slabs and columns can produce significant shear stresses that increase the likelihood of brittle failure. This brittle punching failure mode must be avoided for seismic-resistant flat plate structures. The most common punching strengthening methods are provision of the slab-column connections with drop panels or shear reinforcement or use of high strength concrete in the slab at the vicinity of the connections. This paper compares the effect of these punching strengthening methods on the ductility of slab-column connections. The results of a part of an extensive experimental program conducted on edge slab-column connections, without and with shear reinforcement, are presented. The experiments show that provision of stud shear reinforcement results in seismic-resistant slab-column connections, in which brittle punching failure is avoided in severe earthquakes. The connections with stud shear reinforcement can undergo ductile deformations associated with up to 5% lateral interstorey drift ratio, without loss of resistance to punching due to gravity loads. Key words: concrete design, ductility, energy dissipation, flat slabs, lateral drift, moment transfer, punching, seismic, shear strength, slab-column connections, stiffness, stud shear reinforcement.
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Qadan, Hani, Amjad A. Yasin, Ahmad B. Malkawi, and Muhmmad I. M. Rjoub. "Punching Shear Strength Prediction for Reinforced Concrete Flat Slabs without Shear Reinforcement." Civil Engineering Journal 8, no. 1 (January 1, 2022): 167–80. http://dx.doi.org/10.28991/cej-2022-08-01-013.
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Failure of flat slabs usually occurs by punching shear mode. Current structural codes provide an experience-based design provision for punching shear strength which is often associated with high bias and variance. This paper investigates the effect of adding a horizontal reinforcement mesh at the top of the slab-column connection zone on punching the shear strength of flat slabs. A new equation considering the effect of adding this mesh was proposed to determine the punching shear strength. The proposed equation is based on the Critical Shear Crack Theory combined with the analysis of results extracted from previous experimental and theoretical studies. Moreover, the equation of load-rotation curves for different steel ratios together with the failure criterion curves were evaluated to get the design points. The investigated parameters were the slab thicknesses and dimensions, concrete strengths, size of the supporting column, and steel ratios. The model was validated using a new set of specimens and the results were also compared with the predictions of different international design codes (ACI318, BS8110, AS3600, and Eurocode 2). Statistical analysis provides that the proposed equation can predict the punching shear strength with a level of high accuracy (Mean Square Error =2.5%, Standard Deviation =0.104, Mean=1.0) and over a wide range of reinforcement ratios and compressive strengths of concrete. Most of the predictions were conservative with an underestimation rate of 12%. Doi: 10.28991/CEJ-2022-08-01-013 Full Text: PDF
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Fillo, Ľudovít, Tomáš Augustín, Veronika Knapcová, and Jana Vaskova. "Punching Resistance Verification of Footings." Solid State Phenomena 249 (April 2016): 179–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.249.179.
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The presented paper will bring new aspects of punching resistance verification of concrete column footings and foundation slabs coming from influence of ground stresses distribution on punching verification of flat footings and from new design criteria which depend on the maximum punching resistance defined from crushing of concrete struts (a criterion for limitation of maximum shear forces at the vicinity of the columns) and on the maximum punching resistance defined from shear-bending failure with shear reinforcement, limited by coefficient kmax.
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Chen, Cheng-Chih, and Shun-Long Chen. "Strengthening of Reinforced Concrete Slab-Column Connections with Carbon Fiber Reinforced Polymer Laminates." Applied Sciences 10, no. 1 (December 30, 2019): 265. http://dx.doi.org/10.3390/app10010265.
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This study presents the structural behavior and punching shear strength of the concrete slab-column connections strengthened with carbon fiber reinforced polymer (CFRP) laminates. The variables considered for the twelve specimens included the compressive strength of the concrete, the ratio of the tensile steel reinforcement, and the amount of the CFRP laminates. Square concrete slabs were simply supported along four edges. During the test, monotonically concentrated load was applied to the stub column located at the center of the slab. The punching shear strength, stiffness, and mode of failure were investigated. Test results demonstrated that increasing the compressive strength of concrete, ratio of the steel reinforcement, and amount of the CFRP laminates led to an increase in the punching shear strength of the slabs. Moreover, the CFRP laminates were effective in appreciably increasing the punching shear strength of the slab-column connections. An analytical approach was conducted to calculate the punching shear strength of the slab-column connections strengthened with CFRP laminates. Based on the theory of reinforced concrete members, the application of the CFRP laminates increased the flexural strength of the slab and resulted in an increase of the effective depth of the slab section. Consequently, the punching shear strength was increased. The results of the analytical calculation revealed that the analytical work accurately predicted the experimental punching shear strength.
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Ozden, Sevket, Ugur Ersoy, and Turan Ozturan. "Punching shear tests of normal- and high-strength concrete flat plates." Canadian Journal of Civil Engineering 33, no. 11 (November 1, 2006): 1389–400. http://dx.doi.org/10.1139/l06-089.
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Experimental research was conducted to investigate the punching shear performance of flat plates. A large number of slab specimens of normal- and high-strength concrete were tested under concentric and eccentric loads. The effects of flexural reinforcement and the use of steel fiber reinforcement were investigated. Experimental expressions were developed for the computation of residual slab strength. Experimentally observed punching shear capacities were compared with those from the provisions of Canadian Standards Association (CSA) standard CSA-A23.3-04. The results indicate that concrete strength plays an important role in punching capacity and slab rigidity. Slabs with a higher percentage of flexural reinforcement show an increase in punching capacity. The use of steel fibers results in improved strength and stiffness while also enhancing the postpeak deformability and residual strength. The empirical expressions developed provide reasonably good predictions of residual slab capacities. CSA-A23.3-04 expressions result in conservative punching shear capacity predictions for concentrically loaded slabs and provide good agreement with the experimentally observed punching shear capacities for eccentrically loaded slabs.Key words: reinforced concrete, flat plate, punching shear, strength, high-strength concrete, eccentric loading, slab re inforcement ratio, steel fiber reinforced concrete.
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Sherif, Alaa G., and Walter H. Dilger. "Critical review of Canadian Standards Association standard CSA-A23.3-94 provisions for punching shear strength of edge column–slab connections." Canadian Journal of Civil Engineering 30, no. 6 (December 1, 2003): 1069–80. http://dx.doi.org/10.1139/l03-053.
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The purpose of this paper is to critically review the punching shear strength provisions of the Canadian Standards Association standard CSA-A23.3-94 for edge column–slab connections. Tests from the literature and our own experiments are used to study the most important parameters affecting the punching shear strength of edge slab–column connections. Based on the test results the eccentric shear stress model is evaluated for edge column connections, and improvements are suggested.Key words: edge column–slab connections, flat concrete plates, shear strength, punching shear, shear reinforcement, moment transfer.
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Chung, Joo Hong, Hyun Ki Choi, Chang Sik Choi, and Hyung Suk Jung. "Punching Shear Design Method of Voided Slabs." Key Engineering Materials 754 (September 2017): 333–36. http://dx.doi.org/10.4028/www.scientific.net/kem.754.333.
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This study presents punching shear design method of voided slab in accordance with arrangement of voids around columns. According to previous studies, the slab-column connection of voided slabs is weaker than that of the solid slab due to the lack of cross-sectional area of concrete by voids. In this study, it is assumed that the arrangement of voids exert influence on the punching shear strength of voided slabs. To verify the assumption, finite element analysis was conducted related with previous test results. The variable of FE analysis was a distance between voids and column face. Based on FE analysis and test results including previous studies, punching shear design method is suggested which can consider the arrangement of voids around columns. The suggested design method is based on the punching shear design method in ACI-318. As a result, it can predict the punching shear strength of voided slabs according to arrangement of voids around column.
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MUSSE, T. H., E. A. P. LIBERATI, L. M. TRAUTWEIN, R. B. GOMES, and G. N. GUIMARÃES. "Punching shear in concrete reinforced flat slabs with steel fibers and shear reinforcement." Revista IBRACON de Estruturas e Materiais 11, no. 5 (October 2018): 1110–21. http://dx.doi.org/10.1590/s1983-41952018000500011.
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Abstract Steel fibers in reinforced concrete increase the performance of slab-column connection once they increase ductility and energy absorption capacity of the concrete. The use of fibers in flat slabs may increase strength and change the mode of failure. The objective of this work is to present an experimental evaluation of punching shear strength of reinforced concrete flat slab with steel fibers and punching shear reinforcement. Eight square slabs, size 1800 mm by 1800 mm by 130mm, were loaded until failure by punching shear around the column. The models were divided in two groups, depending on the type of the concrete used (with or without steel fibers). The steel fiber volume used in the slabs of second group was of 0.9%. Each group was composed of four slabs: one without shear reinforcement and three with shear reinforcement (studs) distributed radially around the column. The use of steel fibers increased the ultimate strength of all flat slabs. In one of the slabs, the association of steel fibers with shear reinforcement changed the failure surface from outside to inside the punching shear reinforcement region.
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Yankelevsky, David Z., and Orit Leibowitz. "Punching shear in concrete slabs." International Journal of Mechanical Sciences 41, no. 1 (January 1999): 1–15. http://dx.doi.org/10.1016/s0020-7403(97)00086-6.
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Marčiukaitis, Gediminas, and Remigijus Šalna. "ANALYSIS OF RESEARCH AND DESIGN MODELS FOR THE PUNCHNING SHEAR OF FLAT RC SLABS." Engineering Structures and Technologies 2, no. 3 (September 30, 2010): 93–100. http://dx.doi.org/10.3846/skt.2010.13.
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The paper presents the review and analysis of the existing methods and models for calculating punching shear strength. The analysis of the existing design methods has showed that there is no unified theory about calculating punching shear strength. The models are similar in the way that fictitious shear stresses act in the fictitious shear area and are mainly obtained from the test results that may differ in their values. Therefore, the difference between the results obtained employing various calculation methods can be as high as 1,37 times, whereas the difference between the results of theoretical calculations and test research may vary up to 1,8 times. These facts clearly demonstrate that punching shear phenomena are not completely analyzed and require additional researches. The paper also proposes an in-deep analysis of famous analytical punching shear calculation models suggested within the last 50 years like Kinnunen and Nylander (1960), Moe (1961), Breastrup et al. (1976), Georgopoulos (1989), Broms (1990), Hallgren (1998), Menetrey (2002) and Theodorakopoulos (2002). The development of the above mentioned design models, the main assumptions and an algorithm for calculating punching shear strength are discussed in the article. The review of the existing models for calculating punching shear strength has also revealed that two main model types can be distinguished: type 1 – failure occurs when the compression zone is cut by shear and compression stress; type 2 – failure occurs when tensile stresses in concrete punching cone exceeds its tensile strength. A comparison between theoretical models and test results performed by different authors demonstrate that more accurate results can be obtained by calculating punching shear strength using the first types of models. The analysis has revealed it is purposeful to search for more effective reinforcing methods that can change the character of failure from brittle to plastic. A more effective replacement of reinforcement and the behaviour of concrete taking into account complex stress state in the failure zone should be applied.
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Mashrei, Mohammed, and Alaa Mahdi. "An Adaptive Neuro-Fuzzy Inference Model to Predict Punching Shear Strength of Flat Concrete Slabs." Applied Sciences 9, no. 4 (February 25, 2019): 809. http://dx.doi.org/10.3390/app9040809.
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An adaptive neuro-fuzzy inference system (ANFIS)-based model was developed to predict the punching shear strength of flat concrete slabs without shear reinforcement. The model was developed using a database collected from 207 experiments available in the existing literature. Five key input parameters were used to build the model, which were slab effective depth, concrete strength, reinforcement ratio, yield tensile strength of reinforcement, and width of square loaded area. The output parameter of the model was punching shear strength. The results from the adaptive neural fuzzy inference model were compared to those from the simplified punching shear equations of ACI, BS-8110, Model Code 2010, Euro-Code 2, and also experimental results. The root mean square error (RMSE) and the correlation coefficient (R) were used as evaluation criteria. Parametric studies were presented using ANFIS to assess the effect of each input parameter on the punching shear strength and to compare ANFIS results to those from the equations proposed in commonly used codes. The results showed that the ANFIS model is simple and provided the most accurate predictions of the punching shear strength of two-way flat concrete slabs without shear reinforcement.
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Zabulionis, Darius, Dainius Šakinis, and Povilas Vainiūnas. "STATISTICAL ANALYSIS OF DESIGN CODES CALCULATION METHODS FOR PUNCHING SHEER RESISTANCE IN COLUMN‐TO‐SLAB CONNECTIONS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 12, no. 3 (September 30, 2006): 205–13. http://dx.doi.org/10.3846/13923730.2006.9636394.
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This paper analyses the compliance of the design codes calculation methods for punching shear resistance in reinforced concrete slabs STR 2.05.05:2005, E DIN 1045–1, ENV 1992–1‐1 EC 2, prEN 1992–1 [Final draft] EC 2, Model Code CEB‐FIP 1990, BS 8110, ACI 318–99 to the experimental data. It has been analysed whether the difference in the results of the mean punching shear resistance received according to these methods and through experiments is statistically significant, when the level of significance value is 0,05. To analyse the significance of the difference of the means Student t test was used. An analysis was carried out to find out which methods show the least different resistance results from the experimental data. According to this analysis, a classification of methods was made. Student t test was applied to analyse in which methods the ratio between the punching shear resistance results obtained and the punching shear resistance results received through experiment is statistically insignificant. The level of significance value considered was 0,05. It has been determined that almost in all cases the difference between the punching shear resistance results received experimentally and theoretically is statistically significant. It has also been found out that generally the punching shear resistance can be calculated by applying the prEN 1992–1 [Final draft] EC 2 method. The best method to describe the punching shear resistance in minimally reinforced slabs is ACI 318. The worst results are obtained by applying ENV 1992–1‐1 EC 2 and E DIN 1045–1 methods.
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Choi, Kyoung-Kyu, Gia Toai Truong, Seon-Du Kim, and In-Rak Choi. "Punching shear behaviour of shear reinforced concrete slabs." Proceedings of the Institution of Civil Engineers - Structures and Buildings 168, no. 6 (June 2015): 402–20. http://dx.doi.org/10.1680/stbu.14.00062.
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Lyčka, Lukáš, and Petr Štěpánek. "Strut-and-Tie Model for Predicting the Punching Shear of Flat Slabs with Shear Reinforcement." Solid State Phenomena 259 (May 2017): 178–83. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.178.
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The purpose of this paper is to describe a framework of the proposed method for predicting the punching shear of flat slabs with shear reinforcement. The proposed method is based on a strut-and-tie model. Current methods of predicting the punching shear strength of flat slabs could be divided into these categories: models based on empirical equations, physical models, analytical methods and finite element methods. Most of the current codes in force would be best described as empirical formulations. Physical model for prediction of punching shear is described in Model Code 2010. Proposed method for flat slabs with shear reinforcement is based mainly on a strut-and-tie model and therefore could be considered as an analytical method.For the purpose of demonstrating the effectiveness of the proposed method, the method is compared with some of the main methods currently in use, such as Eurocode EC2, American code ACI 318 and Model Code 2010. The comparison consists of results of more than 98 experiments of punching shear on the flat slabs with shear reinforcement, gathered from publications from all around the world.
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Choi, Hyun Ki. "The Effect of Anchorage Strength with Anchorage Capacity in Flat Plate." Key Engineering Materials 627 (September 2014): 245–48. http://dx.doi.org/10.4028/www.scientific.net/kem.627.245.
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The punching shear on the flat plate slab-column connection can bring about the reason of the brittle punching shear failure which may result of collapsing the whole structure. From the development of residential flat plate system, the shear reinforcement is developed for preventing the punching shear. This study proposed 3 reinforcements that are increased to bond capacity using lateral bar, the structure test is performed. As performed test result, because slabs not keep enough bond length, slab is failed before shear reinforcement's yield strength duo to anchorage of slip. According to result, FEM analyzed an effect of slab thickness and concrete compressive. The study suggests shear strength formula that possible a positive shear reinforcement in slab-column connection.
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Park, Cheol Woo, Jong Sung Sim, and Tai Sik Lee. "Punching Shear Strength Considering Cumulative Damage for FRP Strengthened Bridge Decks under Fatigue Loading." Key Engineering Materials 324-325 (November 2006): 1313–16. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1313.
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This study investigates the punching shear strength of concrete bridge decks strengthened with various fiber reinforced polymer (FRP) materials, carbon fiber sheet (CFS), glass fiber sheet (GFS) and carbon fiber grid (CFG). This study performed fatigue loading tests on the strengthened bridge decks with different fatigue loading levels. Based on the experimental results, a damage index was determined considering the damage mechanics and was applied to the plastic punching shear strength model for the evaluation of the punching shear strength with respect to the number of fatigue loading cycles. The developed model seems to successfully estimate the punching shear strength of damaged bridge decks with sufficient reliability. It is anticipated, therefore, that the developed model may help improving the design of strengthening of damaged bridge deck panels.
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Han, Ju Hong, and Dun Bin Wang. "The Analysis of Punching Shear Strength for Concrete Slabs Based on the Unified Strength Theory." Advanced Materials Research 919-921 (April 2014): 1853–59. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1853.
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Based on the mechanism of punching shear and patterns of failure of Specimen,using the unified strength theory and rigid-plastic models,the punching strength of reinforced concrete slabs supported on four sides is obtained.The theoretical formula of punching shear strength for concrete slab is given.The calculated results are in good agreement with the experimental results.
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Chung, Joo Hong, Hyun Ki Choi, Seung Chang Lee, and Chang Sik Choi. "Punching Shear Strength of Biaxial Hollow Slab with Donut Type Hollow Sphere." Key Engineering Materials 452-453 (November 2010): 777–80. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.777.
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This paper presents the punching shear capacities of biaxial hollow slab with donut type hollow sphere. Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A biaxial hollow slab system is widely known as one of the effective slab system which can reduce self-weight of slab. According to previous studies, the hollow slab has weakness in slab-column connection. In addition, the present code does not provide a clear computation method for the punching shear strength of hollow slab. In this study, the special type of cage was used to improve punching shear capacities and fix the hollow spheres in critical section. To verify the punching shear capacities of this biaxial hollow slab, punching shear tests were performed. Four test specimens were used for test parameters. One was conventional RC slab and three were hollow slabs. The test parameter was the areas of critical section which were determined by the number of hollow spheres in critical section.
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Gardner, N. J. "Punching shear provisions for reinforced and presfressed concrete flat slabs." Canadian Journal of Civil Engineering 23, no. 2 (April 1, 1996): 502–10. http://dx.doi.org/10.1139/l96-054.
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The validity of the CSA A23.3-94 code provisions for punching shear were compared with the punching shear results of 142 reinforced concrete flat slabs, 16 prestressed concrete flat slabs with unbonded tendons, and 17 flat slabs with unbonded prestressed and supplementary bonded reinforcement. The code prediction equations are not capable of direct verification against experimental results without using a correction factor. Using a justifiable correction factor, the CSA A23.3-94 provisions are appropriately conservative for reinforced concrete slabs but the scatter is large. However, it was concluded that the CSA A23.3-94 provisions are not conservative for prestressed concrete flat slabs. An equation is proposed to calculate the punching shear capacity of reinforced concrete and prestressed concrete slabs, which has a smaller coefficient of variation than the punching shear provisions of CSA A23.3-94, for symmetrically loaded interior columns. The critical section of the proposed method is the perimeter of the column, which is easier to justify than an arbitrary critical perimeter half the effective depth of slab from the column. Key words: reinforced concrete, prestressed concrete, flab slabs, punching shear.
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Ghoreishi, Mehrafarid, Ashutosh Bagchi, and Mohamed Sultan. "Review of the Punching Shear Behavior of Concrete Flat Slabs in Ambient and Elevated Temperature." Journal of Structural Fire Engineering 4, no. 4 (December 1, 2013): 259–80. http://dx.doi.org/10.1260/2040-2317.4.4.259.
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There are a number of benefits associated with two-way concrete flat slab construction for office buildings, parking garages and apartments - for example, reduced formwork, prompt erection, flexibility of partitions, and minimal increase in story heights. However, concrete flat slabs could be quite vulnerable to punching shear failure in the event of a fire. The objective of the present article is to provide a state of the art review of the existing research and the issues associated with concrete flat slabs in fire and elevated temperature. There are a number of experimental and analytical studies on the punching shear behavior of concrete flat slabs in ambient conditions, available in the literature. Based on these studies, it is found that punching shear capacity in ambient condition is affected by many factors, which may not remain constant during a fire exposure. Only a limited number of studies on concrete flat slabs for punching shear failure in fire are available. This paper reviews the available experimental and analytical studies, standards and codes to address the research gap in estimating of punching shear strength of concrete flat slab-column connections without shear reinforcement.
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Kang, Tae Jin, Kyung Ho Jung, Jong Kyoo Park, Jae Ryoun Youn, and Seung Goo Lee. "Effect of Punching Density on the Mechanical and Thermal Properties of Needle-punched Nonwoven Carbon/Phenolic Composites." Polymers and Polymer Composites 10, no. 7 (October 2002): 521–30. http://dx.doi.org/10.1177/096739110201000704.
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The effects of changes in the fibre orientation on the mechanical properties of nonwoven composites were investigated through 3-point bending, short beam shear and tensile tests. Oxidized polyacrylonitrile(PAN) carded webs were needle-punched, and then carbonized to fabricate carbon composites with phenolic resin. The interlaminar shear, tensile and flexural strengths increased with increasing punching density. However, the rate of increase reduced and interlaminar shear and tensile strengths decreased with excessive punching density. The erosion rate and the insulation index were calculated by means of a torch test. The ablation resistance increased with increasing punching density, but no significant increase in the erosion rate with increasing punching density above 477 penetrations per square centimetre was found. The thermal conductivity of needle-punched nonwoven carbon/phenolic composites increased with increasing punching density.
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Abdelkhalik, Amr, Tamer Elafandy, Amr Abdelrahman, and Alaa Sherif. "Tests of Slab-Column Connections Subjected to Reversed Cyclic Moments in Addition to Different Levels of Gravity Shear Load." Solid State Phenomena 292 (June 2019): 146–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.292.146.
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Reinforced concrete flat slab-column structures are widely used because of their practicality. However, this type of structures can be subjected to punching-shear failure within the slab-column connections. Without shear reinforcement, the slab-column connection can undergo brittle punching failure, especially when the structure is subjected to lateral loading in seismic zones. This research is a part of an extensive investigation about the punching shear behaviour of interior RC slab-column connections under seismic loading. The main objective is to discuss the effect of the gravity shear level on the punching shear behaviour[1].The current paper represents only the results of the first four tested specimens without shear reinforcement. The first specimen was tested subjected to vertical gravity load only without cyclic loading while the other three specimens were tested under different vertical loads V which was kept constant during testing in addition to a reversed displacement controlled cyclic loading which was increased up to punching shear failure. The gravity load V was chosen as 0.4, 0.6 and 0.8 V0 respectively, where V0 is the vertical load causing punching shear failure according to ACI318-14[2]. All tested specimens have the same slab dimensions of 2000x2000mm, slab thickness 200mm, flexural reinforcement ratio of 1.62% and the same column dimensions 250mm x 250mm. Finally, the experimental results are analyzed and compared to international codes such as American Code ACI318-14 and Euro Code EC2-2004[3]. In light of these results, some preliminary conclusions are presented.
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Yang, Qiu Ning, Ming Jie Mao, and Sumio Hamada. "Data Base for Punching Shear Strength of Reinforced Concrete Slabs and Evaluation for CCES Equation." Applied Mechanics and Materials 90-93 (September 2011): 933–39. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.933.
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Several equations for punching shear strength of the reinforced concrete slab have been proposed in the world. These equations have their own factors affecting the strength. There are numerous test data for punching shear strength of RC slabs, which have been obtained by numerous researchers. A database with approximately 300 specimens has been structured through the present study. In the present study seven equations for punching shear strength are evaluated based on the database. CCES equation is also evaluated from the present database.
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Nováček, Jan, and Miloš Zich. "Study of Flat Slabs Strengthening against Punching Shear." Solid State Phenomena 249 (April 2016): 221–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.249.221.
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The paper focuses on punching shear strengthening of flat slabs. In the study, different, in practice commonly used systems of strengthening are introduced, systems used less frequently are also mentioned. Chosen methods of strengthening are modeled using FEM software considering material nonlinearity and crack development in structures. 3D models with brick finite elements and discrete modeling of reinforcement are used. The way of modeling of the structure itself is verified against known results of tests of concrete slabs under punching shear. Comparison of individual systems of strengthening is performed from the viewpoint of absolute value of punching shear resistance and it is supplemented by calculation of punching shear resistance according to design code EC 1992. Simultaneously, results are compared to the approach of Critical Shear Crack Theory that places great emphasis on deformation capacity of the slab itself, which can be easily determined from FEM models which allow for material nonlinearity.
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Trung, Nguyen Tuan, and Pham Thanh Tung. "Investigation of the effects of opening size and location on punching shear resistance of flat slabs using Abaqus." Journal of Science and Technology in Civil Engineering (STCE) - HUCE 15, no. 4 (October 31, 2021): 136–47. http://dx.doi.org/10.31814/stce.huce(nuce)2021-15(4)-12.
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The paper presents a numerical study on the effects of opening size and location on punching shear resistance of flat slabs without drop panels and shear reinforcement using ABAQUS. The study proposes an ABAQUS model that is enable to predict the punching shear resistance of flat slabs with openings. The model is validated well with the experimental data in literature. Using the validated numerical model, the effects of opening size and location on the punching shear resistance of flat slabs are then investigated, and the numerical results are compared with those predicted by ACI 318-19 and TCVN 5574:2018. The comparison between experimental and numerical results shows that the ABAQUS model is reliable. The punching shear resistances calculated by ACI 318-19 and TCVN 5574:2018 with different opening sizes and locations are agreed well to each other, since the design principles between two codes now are similar.
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Abbas, Abdulnasser M. "NON-LINEAR ANALYSIS TO IMPROVE PUNCHING SHEAR STRENGTH IN FLAT SLAB USING Z-SHAPE SHEAR REINFORCEMENT." Muthanna Journal of Engineering and Technology 7, no. 1 (October 6, 2019): 65–70. http://dx.doi.org/10.52113/3/mjet/2019-7-1/65-70.
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Currently, flat slabs become one of the widely used structures due to its architectural benefits such as uncomplicated formwork, flexibility and minimum construction time. However, these structures are relatively weak to resist the punching shear due to a considerable lowering in stiffness induced from the development of cracks that resulting from axial and seismic loads. Moreover, the punching failure is considered a brittle failure caused by the transferring of unbalanced moments and shear forces between the structural members. Unfortunately, this may cause a catastrophic collapse, especially in the region of the slab-column. Therefore, many experimental and theoretical studies were done to improve the punching strength of the flat slab. In the current work; a finite element three-dimensional non-linear analysis has simulated by ABAQUS tool to investigate the structural behaviour of flat slab. Two specimens have considered, the first is a flat slab reinforced by ordinary steel reinforcement. While in the second one, a Z-shape shear rebar improvement has been added to the slab-column connection. The proposed model has reflected a reasonable enhancement to the flat slab. The analysis considers different parameters such as punching shear forces, deformations, and stresses of Von-Mises. The outcomes indicate that punching shear strength is increased by approximately 11.1%, and the deflections are decreased by 77.3% when the Z-shape reinforcement is used. In the meantime, stress concentrations were reduced and move from the slab-column connection.
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SANTOS, D. F. A., A. F. LIMA NETO, and M. P. FERREIRA. "Punching shear resistance of reinforced concrete footings: evaluation of design codes." Revista IBRACON de Estruturas e Materiais 11, no. 2 (April 2018): 432–54. http://dx.doi.org/10.1590/s1983-41952018000200011.
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Abstract Punching is a possible failure mode for slender footings and it may lead a structure to ruin through progressive collapse. Although footing present different geometric characteristics, their punching shear design is based on the empirical methods used for flat slabs. This paper uses experimental results from 216 tests to evaluate the performance of design code recommendations presented by ACI 318 (2014), ABNT NBR 6118 (2014) and Eurocode 2 (2010) to estimate the punching shear resistance of reinforced concrete footings. Great dispersion between theoretical and experimental results was observed, being evident that the test system affects the punching shear capacity of footings. The more complex method proposed by Eurocode 2 resulted in a better correlation with experimental results.
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Cantone, Raffaele, Beatrice Belletti, Luca Manelli, and Aurelio Muttoni. "Compressive Membrane Action Effects on Punching Strength of Flat RC Slabs." Key Engineering Materials 711 (September 2016): 698–705. http://dx.doi.org/10.4028/www.scientific.net/kem.711.698.
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The design of reinforced concrete flat slabs in practice can be governed at failure by punching shear close to concentrated loads or columns. Punching shear resistance formulations provided by codes are calibrated on the basis of experimental tests on isolated slabs supported on columns in axisymmetric conditions. Nevertheless, the behavior of flat slabs can be different than isolated specimens due to the potentially beneficial contributions of moment redistributions and compressive membrane actions. Accounting for the significance of these effects, nonlinear finite element analyses are performed with the crack model PARC_CL implemented in Abaqus. This paper aims to investigate a series of punching shear tests on slabs with and without shear reinforcement, different reinforcement ratios and loading conditions accounting for the potential contribution to the enhancement of the punching strength due to compressive membrane action (CMA). The numerical results with a multi – layered shell modeling are then post – processed adopting the failure criterion of the Critical Shear Crack Theory (CSCT). The results pointed out the significant outcomes and differences between standard specimens and actual members showing how the current codes of practice may underestimate the punching capacity.
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Vinh, Tran Xuan, Nguyen Trung Hieu, Pham Xuan Dat, and Nguyen Manh Hung. "Evaluation of punching shear capacity of two-way RC slabs without transverse reinforcement according to different provisions." Journal of Science and Technology in Civil Engineering (STCE) - NUCE 15, no. 3 (August 16, 2021): 171–84. http://dx.doi.org/10.31814/stce.nuce2021-15(3)-14.
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Currently, RC flat slabs are being used commonly because of their advantages. Punching shear failure is one of the governing failure modes of RC flat slabs without column capital and drop panels. In this paper, the provisions for predicting the punching shear capacity of two-way reinforced concrete (RC) flat slabs without shear reinforcement including ACI 318-19, Eurocode 2 and TCVN 5574:2018 provisions are reviewed by mean of considering the influences of the main parameters (effective depth, compressive strength of concrete, loaded area, reinforcement ratio). A total of 169 test results collected from the literature were used to compare with the provisions. The aim of this study was to evaluate the level of applicability of predicting the punching shear capacity of two-way RC flat slabs according to these provisions. The comparison results indicated that the Eurocode 2 provision provides the most accurate prediction of punching shear capacity of two-way RC flat slabs.
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Zardi, Muhammad. "PERILAKU PUNCHING SHEAR PADA HUBUNGAN KOLOM BULAT DENGAN FLAT SLAB AKIBAT BEBAN TEKAN AKSIAL." Jurnal Teknik Sipil Unaya 1, no. 1 (February 27, 2019): 1–14. http://dx.doi.org/10.30601/jtsu.v1i1.1.
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The aim of the tests was to investigate the influence of concrete strength, the eccentricity of the column and the use of shear reinforcement in flat slabs on punching shear. The research specimens are 8 units of flat slabs. Flat slab size 1400 x 1400 mm2 with thickness of 120 mm. Flat slabs were connected with circular column with dimension 225 mm of diameter and 200 mm of height. Flat slabs were made in to 2 variations of concrete strength, e.i. 30 MPa and 60 MPa, 2 variations of shear reinforcement, e.i. without shear reinforcement and with shear reinforcement and 2 variations of eccentricity that, e.i. without eccentricity and with eccentricity. Each treatment has 1 specimen. Each specimen has 6 cylinder specimens. Cylinder specimens used as a concrete strength control for main specimen (flat slab). The tests showed that the concrete strength had a strong influence on punching shear strength. This is shown by capacity increase of 42.78%; 54.00%; 46.59% and 0.02%. The value is ratio between the maximum load of the specimens with 60 MPa and 30 MPa at the same eccentricity and the same shear reinforcement. The eccentricity of column reduce the capacity of punching shear. This is shown by 3 specimens decrease in capacity of 3.70%; 36.75% and 7.30%. Only 1 specimen that increase in capacity of 9.27%. The value is ratio between the maximum load of the specimens with 40 mm eccentricity and 0 mm eccentricity at the same compressive strenght and the same shear reinforcement. The use of shear reinforcement does not always increase the punching shear capacity. There are 2 observations that increased capacity (52.07% and 65.37% at the centric load) and 2 observations decreased capacity (0.12% and 4.92% at the eccentric load). The value is ratio between the maximum load on the specimens using shear reinforcement with the specimens that do not use shear reinforcement at the same compressive strenght and the same eccentricity.The use of shear reinforcement increase punching shear capacity of flat slab at the centric load condition. The use of shear reinforcement decrease punching shear capacity of flat slab at the eccentric load condition.
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Ghali, Amin, and Sami Megally. "Design for punching shear in concrete: critical review of Canadian Standard CSA-A23.3-94." Canadian Journal of Civil Engineering 23, no. 2 (April 1, 1996): 444–56. http://dx.doi.org/10.1139/l96-048.
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The requirements of the new Canadian Standard CSA-A23.3-94 "Design of concrete structures" to avoid punching failure of slabs at their connections with columns are critically reviewed. Changes are proposed to avoid unsafe design and to cover practical situations not adequately treated by the Standard. Key words: columns, connections, flat concrete plates, punching shear, reinforced concrete, shear reinforcement, shear strength, stud shear reinforcement, slabs.
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Salman, Donia, Rabab Allouzi, and Nasim Shatarat. "Punching shear behaviour of flat slabs with different reinforcement schemes: openings and rectangularity effects." International Journal of Structural Integrity 12, no. 4 (April 29, 2021): 589–612. http://dx.doi.org/10.1108/ijsi-08-2020-0079.
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PurposeThe main goal is to investigate the effect of size and location of opening and column size on the punching shear strength. Openings are often needed in order to install mechanical and electrical services. This process takes away part of the concrete volume which is responsible for resisting the shear forces and any unbalanced moment. Furthermore, the application of rectangular columns in flat slabs is commonly used in practice as they provide lateral stiffness to the building. They are also utilised in garages and multi-storey buildings where these elongated cross-sectional columns reduce the effective span length between adjacent columns.Design/methodology/approachThis research is a numerical-based investigation that is calibrated based on a thirteen previously tested and numerically calibrated slab specimens with no openings. A parametric study is conducted in this study to consider the effect of other parameters, which are the size and location of opening and the rectangularity ratio of column in order to evaluate their effect on the punching shear capacity. A total of 156 models are developed to study these factors. Additionally, the predicted shear carrying capacity of the simulated slabs is calculated using the ACI318–19 and Eurocode (EC2-04) equation.FindingsThe presence of openings reduced the punching shear capacity. The small opening's location and orientation have almost no effect except for one slab. For slabs of large openings, the presence of openings reduced the punching capacity. The punching capacity is higher when the openings are farther from the column. The numerically obtained results of slabs with rectangular columns show lower punching capacity compared to slabs of squared columns with the same length of the punching shear control perimeter. The punching capacity for all slabs is predicted by ACI318–19 and Eurocode (EC2-04) and it is found that Eurocode (EC2-04) provided a closer estimation.Originality/valueThe slabs considered for calibration were reinforced with four different punching shear reinforcement configurations, namely; ordinary closed rectangular stirrups, rectangular spiral stirrups, advanced rectangular spiral stirrups and circular spiral. Generally, there has been limited research on concrete flat slabs with openings in comparison with other subjects related to structural engineering (Guan, 2009) and no research on punching shear with openings of slabs reinforced with these reinforcement schemes. The available research focussed on the effects of openings on the flexural behaviour of reinforced concrete slabs includes Casadei et al. (2003), Banu et al. (2012) and Elsayed et al. (2009). In addition, experimental tests that examined slabs supported on rectangular columns are very limited.
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Grabski, Maciej, and Andrzej Ambroziak. "Shear Cap Size Selection Method Based on Parametric Analysis of ACI-318 Code and Eurocode 2 Standard." Materials 13, no. 21 (November 3, 2020): 4938. http://dx.doi.org/10.3390/ma13214938.
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The scope of the paper is to propose a method for determining the size of shear caps in a slab–column-connections-reinforced concrete structure. Usually, shear heads are used to enhance slab–column connection, especially when the transverse reinforcement does not give the required punching shear load capacity. The dimensions of the shear head should provide the punching shear resistance of the connection inside and outside the enhanced region. The process of selecting the size of the shear head is iterative. The parametric analysis of the ACI 318 code and EC2 standard has the objective of indicating which control perimeter (inside or outside the shear head) has a decisive impact on the punching shear capacity of the connection. Based on the analysis, the authors propose methods for selecting the dimensions of the shear head with practical application examples. The paper is intended to provide scientists, civil engineers, and designers with guidelines to design the process of the slab–column connections with the shear caps.
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Guan, Hong, and Yew-Chaye Loo. "Failure analysis of columnslab connections with stud shear reinforcement." Canadian Journal of Civil Engineering 30, no. 5 (October 1, 2003): 934–44. http://dx.doi.org/10.1139/l03-058.
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The design of a flat plate structure is generally governed either by serviceability limits on deflection or punching shear strength of the columnslab connections. To increase the strength of a columnslab connection, a new type of shear reinforcement, referred to as shear stud, is gaining popularity in practice. In this paper, a nonlinear layered finite element method (LFEM) is used to investigate the effectiveness of the shear studs in increasing the punching shear strength of edge and corner columnslab connections. In total, nine large-scale reinforced concrete slabs of a flat plate floor in the vicinity of edge and corner columns, tested previously in the laboratory, are analysed. All the slabs contained stud shear reinforcement (SSR) except a control slab where no SSR was provided. The test variables were the column size and the ratio of stud spacing to slab thickness. The punching shear strengths, loaddeflection responses, and crack patterns predicted by the LFEM are compared with the experimental results. The numerical investigation confirms the accuracy and effectiveness of the LFEM in predicting the strength of columnslab connections with SSR.Key words: columnslab connection, concrete flat plate, punching shear, stud shear reinforcement, finite element analysis.
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Holmes, Niall, and Eoin Byrne. "Effects of Posttensioning Slippage on 2-Way Spanning Concrete Slabs." Advances in Civil Engineering 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/980840.
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This paper investigates the effect of improper posttensioning of a 2-way spanning concrete slab subject to a central point load. Due to plate slippage alone, the support conditions only offered a 1-way spanning action which could have led to premature failure with dangerous consequences. Posttensioning can strengthen a flat slab against punching shear by controlling deflections and cracking under service loads compared with traditional punching shear reinforcing methods leading to more slender structures and economic solutions for longer spans. However, if the method is not properly applied, these thinner floor plates can fail in a brittle and sudden manner by punching at ultimate limit state and excessive deflection in serviceability. Concrete slabs containing traditional shear reinforcement performed adequately and demonstrated that the critical punching shear perimeter, defined as twice the depth of the slab, was confirmed from measured deflections and crack pattern analysis.
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Kara, Ilker, and Besian Sinani. "Prediction of Punching Shear Capacity of Two-Ways FRP Reinforced Concrete Slabs." Spring 2017 5, no. 2 (May 1, 2017): 1–7. http://dx.doi.org/10.33107/ijbte.2017.5.2.03.
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An innovative solution to the corrosion problem is the use of fiber-reinforced polymer (FRP) as an alternative reinforcing material in concrete structures. In addition to the non corrodible nature of FRP materials, they also have a high strength-to-weight ratio that makes them attractive as reinforcement for concrete structures. Extensive research programs have been carried out to investigate the flexural behavior of concrete members reinforced with FRP reinforcement. On the other hand, the shear behavior of concrete members, especially punching shear of two-way slabs, reinforced with FRP bars has not yet been fully explored. The existing provisions for punching of slabs in most international design standards for reinforced concrete are based on tests of steel reinforced slabs. The elastic stiffness and bonding characteristics of FRP reinforcement are sufficiently different from those of steel to affect punching strength. In the present study, the equations of existing design standards for shear capacity of FRP reinforced concrete beams have been evaluated using the large database collected. The experimental punching shear strengths were compared with the available theoretical predictions, including the CSA S806 (CSA 2012), ACI-440.1R-15 (ACI 2015), BS 8110 (BSI 1997), JSCE (1997) a number of models proposed by some researchers in the literature. The existing design methods for FRP reinforced concrete slabs give conservative predictions for the specimens in the database. This paper also presents a simple yet improved model to calculate the punching shear capacity of FRPreinforced concrete slabs. The proposed model provides the accurate results in calculating the punching shear strengths of FRP-reinforced concrete slender slabs.
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Silfwerbrand, Johan. "Punching shear capacity of RC slabs." Cement and Concrete Composites 24, no. 6 (December 2002): 489–90. http://dx.doi.org/10.1016/s0958-9465(01)00064-6.
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Mota dos Santos Junior, Paulo Sergio, Andre Gonçalves Malcher da Silva, and Denio Ramam Carvalho de Oliveira. "CFRP laminate as punching shear reinforcement." Engineering Structures 237 (June 2021): 112072. http://dx.doi.org/10.1016/j.engstruct.2021.112072.
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Wang, Xiao Wei, Wen Ling Tian, Zhi Yuan Huang, Ming Jie Zhou, and Xiao Yan Zhao. "Analysis on Punching Shear Behavior of the Raft Slab Reinforced with Steel Fibers." Key Engineering Materials 400-402 (October 2008): 335–40. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.335.
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The thickness of the raft slab is determined by punching shear. The raft slab is commonly thick, which causes concrete volume is large. Mass concrete can bring disadvantage to the foundation. In order to increase the bearing capacity and reduce the thickness, it is suggested that the raft slab to be reinforced by steel fibers. There are five groups of specimens in this paper. S1 is the common reinforced concrete slab. S2 and S3 are concrete slabs reinforced by steel fibers broadcasted layer by layer when casting specimen. S4 and S5 are concrete slabs reinforced by steel fibers mixed homogeneously when making concrete. The punching shear tests of these slabs were done. The test results indicate that the punching shear capacity of the slab reinforced with steel fibers is higher than that of concrete slab, the stiffness and crack resistance of the steel fibers reinforced concrete slab are better than those of the common concrete slab and the punching shear of the slabs with different construction methods of steel fibers is similar. It analyses the punching shear behavior of the slab reinforced with steel fibers and suggests the ultimate bearing formula. The calculative values are coincided with the measured values well.
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Ju, Minkwan, Kyoungsoo Park, and Cheolwoo Park. "Punching Shear Behavior of Two-Way Concrete Slabs Reinforced with Glass-Fiber-Reinforced Polymer (GFRP) Bars." Polymers 10, no. 8 (August 9, 2018): 893. http://dx.doi.org/10.3390/polym10080893.
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This study investigated the punching shear behavior of full-scale, two-way concrete slabs reinforced with glass fiber reinforced polymer (GFRP) bars, which are known as noncorrosive reinforcement. The relatively low modulus of elasticity of GFRP bars affects the large deflection of flexural members, however, applying these to two-way concrete slabs can compensate the weakness of the flexural stiffness due to an arching action with supporting girders. The test results demonstrated that the two-way concrete slabs with GFRP bars satisfied the allowable deflection and crack width under the service load specified by the design specification even in the state of the minimum reinforcement ratio. Previous predicting equations and design equations largely overestimated the measured punching shear strength when the slab was supported by reinforced concrete (RC) girders. The strength difference can be explained by the fact that the flexural behavior of the supporting RC beam girders reduces the punching shear strength because of the additional deflection of RC beam girders. Therefore, for more realistic estimations of the punching shear strength of two-way concrete slabs with GFRP bars, the boundary conditions of the concrete slabs should be carefully considered. This is because the stiffness degradation of supporting RC beam girders may influence the punching shear strength.
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Pang, Rui, Longji Dang, Hongmei Ni, Shuting Liang, and Qianqian Li. "Experimental study on punching shear behavior of hollow floor slab-column reinforced connection." Advances in Structural Engineering 22, no. 7 (December 21, 2018): 1531–43. http://dx.doi.org/10.1177/1369433218819565.
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This article presents an experimental study on hollow floor slab-column-reinforced connections, which are enhanced by installing locally solid zone of slab around the column and hidden beam in the floor. To investigate the punching-shear behavior of hollow floor slab-column-reinforced connections, six hollow floor slab-column-reinforced connections under vertical load were conducted on three types of connections with different thickness, namely, two hollow floor slab-column-reinforced connections without punching component, two hollow floor slab-column-reinforced connections with bent-up steel bars, and two hollow floor slab-column-reinforced connections with welding section steel cross bridging. Meanwhile, the strength, stiffness, failure mode, and ductility of hollow floor slab-column-reinforced connections with punching components were obtained and compared with the hollow floor slab-column-reinforced connections without punching component. The results showed that hollow floor slab-column-reinforced connections had the double failure characteristics including punching shear and flexural failure, and flexural failure was the main failure mode as a result of installing hidden beam. The hollow floor slab-column-reinforced connections with punching components exhibited higher initial stiffness and higher loading capacity than hollow floor slab-column-reinforced connections without punching components, but welding section steel cross bridging have a better on improving the connections’ punching-shear capacity than bent-up steel bars.
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Trekin, Nikolay, and Dmitrii Pekin. "Experimental research of punching shear mechanism of reinforcing concrete slab." E3S Web of Conferences 97 (2019): 04032. http://dx.doi.org/10.1051/e3sconf/20199704032.
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The analysis of various regulatory methods for calculating reinforced concrete slabs for pushing and comparing with experiment results is made. The tested sample, measuring equipment and test bench are described. Sizes and materials for experimental prototype were chosen by existing beamless and capless slabs of monolithic reinforced concrete superstructures with column grid from 8×8 to 9×9 m. Experimental research results of reinforcing concrete plate structure are presented for study purpose of stress-strain state when punching shear collapse occurring. Various aspects and observations obtained during the test are given. The comparison of the tested slab fragment with the complete response of slab structure is performed. Analysis of tested sample stress-strain state and punching bearing capacity calculations results in according to existing regular standards were made. Main criterias of punching shear collapse were determined and new procedure for punching calculation of RC concrete slabs was offered basing on significantly new approach in punching bearing capacity defining.
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Yooprasertchai, Ekkachai, Yonlada Tiawilai, Theerawee Wittayawanitchai, Jiranuwat Angsumalee, Panuwat Joyklad, and Qudeer Hussain. "Effect of Shape, Number, and Location of Openings on Punching Shear Capacity of Flat Slabs." Buildings 11, no. 10 (October 17, 2021): 484. http://dx.doi.org/10.3390/buildings11100484.
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Experimental evidence have proved that punching shear capacity of flat slabs deteriorate with the presence of openings located within the critical perimeter around columns. It is understood that this deterioration varies inversely with the distance of openings from column’s face. However, effect of the shape of openings on punching shear capacity is not well known. This study presents experimental results of 14 flat specimens to investigate the effects of the number (2 and 4), shape (circular, square, and rectangular), and location (1 and 4 times of slab’s thickness from column’s face) of openings on punching shear strength. It was found that circular openings had least influence on punching capacity followed by square and rectangular openings, respectively. Further, placing openings at a distance of four times the slab’s thickness from column’s face had minimal impact on punching capacity. Further, increasing the number of openings from 2 to 4 substantially reduced the punching capacity. An effort was made to predict the punching capacities of all specimens using the descriptive equations of ACI 318-19 and Eurocode 2. Mean of the ratio of experimental to analytical results and standard deviation of ACI equations were found to be more accurate than those of Eurocode 2 predictions.
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Lee, Sang-Sup, Jiho Moon, Keum-Sung Park, and Kyu-Woong Bae. "Strength of Footing with Punching Shear Preventers." Scientific World Journal 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/474728.
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The punching shear failure often governs the strength of the footing-to-column connection. The punching shear failure is an undesirable failure mode, since it results in a brittle failure of the footing. In this study, a new method to increase the strength and ductility of the footing was proposed by inserting the punching shear preventers (PSPs) into the footing. The validation and effectiveness of PSP were verified through a series of experimental studies. The nonlinear finite element analysis was then performed to demonstrate the failure mechanism of the footing with PSPs in depth and to investigate the key parameters that affect the behavior of the footing with PSPs. Finally, the design recommendations for the footing with PSPs were suggested.