Journal articles: 'Reinforced concrete – Cracking'

1

Dong, Chun Min, Ke Dong Guo, and Jia Jia Sun. "A New Calculation Method for Cracking Width of Beam with High Strength Rebar." Advanced Materials Research 243-249 (May 2011): 415–18. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.415.

Full text

Abstract:

With the application of high strength concrete and rebar, the influence of concrete strength on cracking width of reinforced concrete beam with high strength rebar is becoming more and more important. To investigate the effect of concrete strength on cracking width of reinforced concrete beam with high strength rebar, the experiment including 6 simply supported T-beams with high-strength rebar and 2 beams with ordinary-strength rebar have been made. Then the relevant specifications advised in Code for Design of Concreter Structure (GB50010-2002) are revised according to the experiment results so as to considering the influence of concrete on cracking width. A new cracking width method considering the influence of concrete strength on cracking width for reinforced concrete beam with high strength rebar is proposed. Finally, the comparisons between predictions and experiment results have been conducted, which shown that the proposed new cracking width method agreed with experiment results well.

APA, Harvard, Vancouver, ISO, and other styles

2

Mohamed Sayed, Ahmed, Mohamed Mohamed Rashwan, and Mohamed Emad Helmy. "Experimental Behavior of Cracked Reinforced Concrete Columns Strengthened with Reinforced Concrete Jacketing." Materials 13, no. 12 (June 24, 2020): 2832. http://dx.doi.org/10.3390/ma13122832.

Full text

Abstract:

Reinforced concrete (RC) columns often need to be strengthened or rehabilitated to allow them to carry the loads applied to them. In previous studies, RC columns have been strengthened by jacketing, without considering the occurrence of cracking. In this study, the behavior of RC columns strengthened externally by jacketing after cracking is analyzed. The accuracy of the existing models was verified by analyzing the performance of fifteen RC columns with different cross-sections to determine the effect of new variables, such as the column size, amount of steel reinforcement, and whether the column was cracked or not, on the effectiveness of strengthening. The analysis demonstrated that this strengthening technique could effectively improve both the ductility and strength of RC column cross-sections. The results indicate that the model suggested by the ACI-318 code can predict the ultimate load capacity of RC columns without strengthening, or strengthened by RC jacketing before or after cracking, with higher accuracy and material efficiency. The RC columns without strengthening met the safety limit of the ACI-318 model. However, for strengthened columns, a reduction coefficient must be used to enable the columns to meet the safety limit, with values of 94% and 76% for columns strengthened before and after cracking, respectively. Furthermore, strengthening after cracking affects the ultimate load capacity of the column, with 15.7%, 14.1%, and 13.5% lower loads for square, rectangular, and circular columns than those strengthened before cracking, respectively.

APA, Harvard, Vancouver, ISO, and other styles

3

Nguyen, Duy-Liem, Duc-Kien Thai, and Dong-Joo Kim. "Direct tension-dependent flexural behavior of ultra-high-performance fiber-reinforced concretes." Journal of Strain Analysis for Engineering Design 52, no. 2 (February 2017): 121–34. http://dx.doi.org/10.1177/0309324716689625.

Full text

Abstract:

This research investigated the effects of direct tensile response on the flexural resistance of ultra-high-performance fiber-reinforced concretes by performing sectional analysis. The correlations between direct tensile and flexural response of ultra-high-performance fiber-reinforced concretes were investigated in detail for the development of a design code of ultra-high-performance fiber-reinforced concrete flexural members as follows: (1) the tensile resistance of ultra-high-performance fiber-reinforced concretes right after first-cracking in tension should be higher than one-third of the first-cracking strength to obtain the deflection-hardening if the ultra-high-performance fiber-reinforced concretes show tensile strain-softening response; (2) the equivalent bottom strain of flexural member at the modulus of rupture is always higher than the strain capacity of ultra-high-performance fiber-reinforced concretes in tension; (3) the softening part in the direct tensile response of ultra-high-performance fiber-reinforced concretes significantly affects their flexural resistance; and (4) the moment resistance of ultra-high-performance fiber-reinforced concrete girders is more significantly influenced by the post-cracking tensile strength rather than the tensile strain capacity. Moreover, the size and geometry effects should be carefully considered in predicting the moment capacity of ultra-high-performance fiber-reinforced concrete beams.

APA, Harvard, Vancouver, ISO, and other styles

4

Masmoudi, R., B. Benmokrane, and O. Chaallal. "Cracking behaviour of concrete beams reinforced with fiber reinforced plastic rebars." Canadian Journal of Civil Engineering 23, no. 6 (December 1, 1996): 1172–79. http://dx.doi.org/10.1139/l96-926.

Full text

Abstract:

This paper presents the results of an experimental investigation on the cracking behaviour of concrete beams reinforced with fiber reinforced plastic rebars. The effects of reinforcement ratio on the cracking pattern, crack spacing, cracking moment, and crack width are investigated. The test results indicate that the reinforcement ratio has no meaningful effect on the cracking moment, which can be calculated as recommended by the ACI code. Also, the use of the equations adopted by ACI and the European codes for the prediction of crack width of conventionally reinforced concrete members is investigated and due modifications are made. Both relationships show good correlation with the test results; and the prediction of crack width of concrete beams reinforced with these two types of fiber reinforced plastic rebars is now possible. Key words: beam, cracking behaviour, cracking moment, crack width, fiber reinforced plastic, flexure, rebars, reinforced concrete, reinforcement ratio.

APA, Harvard, Vancouver, ISO, and other styles

5

Choe, Gyeongcheol, Yasuji Shinohara, Gyuyong Kim, Sangkyu Lee, Euibae Lee, and Jeongsoo Nam. "Concrete Corrosion Cracking and Transverse Bar Strain Behavior in a Reinforced Concrete Column under Simulated Marine Conditions." Applied Sciences 10, no. 5 (March 5, 2020): 1794. http://dx.doi.org/10.3390/app10051794.

Full text

Abstract:

This study performed accelerated corrosion tests on reinforced concrete (RC) specimens reinforced with transverse steel bars to evaluate the concrete cracking and rebar strain behaviors caused by rebar corrosion. Seven RC specimens were created with variable compressive strengths, rebar diameters, and concrete cover thicknesses. To mimic in-situ conditions, the accelerated corrosion tests applied a current to the longitudinal bar and transverse bar for different periods of time to create an unbalanced chloride ion distribution. These tests evaluated the amount of rebar corrosion, corrosion cracking properties, and transverse bar strain behavior. The corrosion rate of the transverse bar was faster than that of the longitudinal bar, and cracking first occurred in the concreate around the transverse bar in the specimens with low concrete compressive strength and thin concrete cover. Corrosion cracking and rebar strain were greatly affected by the behavior of the corrosion products that resulted from the pore volume and cracking properties of the cement paste.

APA, Harvard, Vancouver, ISO, and other styles

6

Słowik, Marta. "Influence of tensile softening of concrete on crack development and failure in concrete and reinforced concrete beams." Bulletin of the Military University of Technology 68, no. 1 (March 29, 2019): 213–23. http://dx.doi.org/10.5604/01.3001.0013.1481.

Full text

Abstract:

In the paper, the own test results were presented. The experimental investigation was focused at determining the cracking and load capacity of beams made of concrete. The beams were characterized by different longitudinal reinforcement ratio from zero — plain concrete beams, through low ratio 0.12% — slightly reinforced concrete beams, middle ratio 0.9% — typical reinforced concrete beams, up to the ratios 1.3% and 1.8% — higher reinforced concrete beams. On the basis of the performed experiments and the results of numerical calculations, the process of crack’s formation and crack’s development in plain concrete, slightly reinforced concrete and reinforced concrete beams with different reinforcement ratio was described. When discussing cracking process in the beams, the contribution of strain softening of tensile concrete in the microcracked zone on the character of beams’ failure was analysed as well. Keywords: civil engineering, concrete and reinforced concrete members, cracking and load capacity.

APA, Harvard, Vancouver, ISO, and other styles

7

Barzegar, Fariborz, and William C. Schnobrich. "Post-cracking analysis of reinforced concrete panels including tension stiffening." Canadian Journal of Civil Engineering 17, no. 3 (June 1, 1990): 311–20. http://dx.doi.org/10.1139/l90-038.

Full text

Abstract:

In finite element analysis of reinforced concrete structures, the effect of bond forces between concrete and reinforcement, referred to as tension stiffening, is discussed. To account for this phenomenon, the post-cracking constitutive model for concrete is modified by assigning a linear strain softening branch to its stress–strain curve in the tensile stress direction. For analyzing orthogonally reinforced concrete panels, a simple procedure for determining the termination strain on the softening branch is then developed. Appropriate constitutive models for steel and uncracked concrete along with the post-cracking model to simulate the behavior of cracked reinforced concrete are implemented in a finite element program. Three orthogonally reinforced concrete test panels subjected to pure shear loadings causing inclined cracking are analyzed. It is shown that the adopted numerical procedures are capable of predicting the post-cracking responses, ultimate capacities, and modes of failure for the analyzed panels with good accuracy. The capabilities of the employed post-cracking model to simulate the crack shifting behavior observed during testing of a highly anisotropically reinforced panel is also demonstrated. Key words: reinforced concrete panels, finite element, post-cracking, tension stiffening, crack shifting, ultimate load.

APA, Harvard, Vancouver, ISO, and other styles

8

Lv, Li Bin, Mei Du, and Yong Xun. "Design and Production of Pre-Stressed Carbon Fabric Used in Fabric Reinforced Concrete Board." Applied Mechanics and Materials 174-177 (May 2012): 900–904. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.900.

Full text

Abstract:

Pre-stressed fabric reinforced concrete sheet is used to make permanent model or to reinforce the existing buildings, it will make the surface of reinforced concrete with steel bar tightness and better cracking resistance, it is beneficial to fully manifest the effect of high strength and high modulus before the sheet cracking; the pre-stressed method improves sheet rigidity, it is beneficial for the sheet to cooperate with structure of reinforced concrete. The paper introduced the designing process of carbon/glass braided fabric composite material, and illuminated selecting raw material, means of making fabric, specification and selecting impregnating agent, meanwhile it made simple measurement to the fabric.

APA, Harvard, Vancouver, ISO, and other styles

9

Rasmussen, Annette Beedholm, Jakob Fisker, and Lars German Hagsten. "Cracking in Flexural Reinforced Concrete Members." Procedia Engineering 172 (2017): 922–29. http://dx.doi.org/10.1016/j.proeng.2017.02.102.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Stochino, Flavio, Luisa Pani, Lorena Francesconi, and Fausto Mistretta. "Cracking of Reinforced Recycled Concrete Slabs." International Journal of Structural Glass and Advanced Materials Research 1, no. 1 (January 1, 2017): 3–9. http://dx.doi.org/10.3844/sgamrsp.2017.3.9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Giry, Cédric, Cécile Oliver-Leblond, Frédéric Dufour, and Frédéric Ragueneau. "Cracking analysis of reinforced concrete structures." European Journal of Environmental and Civil Engineering 18, no. 7 (January 28, 2014): 724–37. http://dx.doi.org/10.1080/19648189.2014.881756.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Lu, Zhao Hong, and Xiao Song Gu. "Cracking Behavior Analysis of Carbon Fiber Reinforced Concrete Beam." Applied Mechanics and Materials 204-208 (October 2012): 3082–85. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3082.

Full text

Abstract:

This paper analyzed the cracking behavior of carbon fiber reinforced concrete beam under static load using the finite element numerical analysis. By the way of finite element numerical simulation and the method of increasing the load gradually to analyze the carbon fiber content influence on the beam cracking, crack developing, beam deflection and beam average crack spacing. By comparing with the simulation result of common reinforced concrete beam test piece, it turned out that the carbon fiber reinforced concrete beam has a good cracking and deformation behavior under the same ratio of reinforcement. Under the same load, both the carbon fiber reinforced concrete beam and the common reinforced concrete beam have a small deformation, but the carbon fiber reinforced concrete beam showed a better resistance to deformation as the load increasing, its deflection increasing extent showed an obvious decrease compared with that of the common reinforced concrete beams. Its crack width can be revised by the common reinforced concrete beam rules.

APA, Harvard, Vancouver, ISO, and other styles

13

Martínez-Ibernón, Ana, Marta Roig-Flores, Josep Lliso-Ferrando, Eduardo J. Mezquida-Alcaraz, Manuel Valcuende, and Pedro Serna. "Influence of Cracking on Oxygen Transport in UHPFRC Using Stainless Steel Sensors." Applied Sciences 10, no. 1 (December 28, 2019): 239. http://dx.doi.org/10.3390/app10010239.

Full text

Abstract:

Reinforced concrete elements frequently suffer small cracks that are not relevant from the mechanical point of view, but they can be an entrance point for aggressive agents, such as oxygen, which could initiate the degradation processes. Fiber-Reinforced Concrete and especially Ultra High Performance Concrete increase the multi-cracking behavior, reducing the crack width and spacing. In this work, the oxygen availability of three types of concrete was compared at similar strain levels to evaluate the benefit of multi-cracking in the transport of oxygen. The types of concrete studied include traditional, High-Performance, and Ultra-High-Performance Fiber-Reinforced Concrete with and without nanofibers. To this purpose, reinforced concrete beams sized 150 × 100 × 750 mm3 were prepared with embedded stainless steel sensors that were located at three heights, which have also been validated through this work. These beams were pre-cracked in bending up to fixed strain levels. The results indicate that the sensors used were able to detect oxygen availability due to the presence of cracks and the detected differences between the studied concretes. Ultra High Performance Concrete in the cracked state displayed lower oxygen availability than the uncracked High Performance Concrete, demonstrating its potential higher durability, even when working in cracked state, thanks to the increased multi-cracking response.

APA, Harvard, Vancouver, ISO, and other styles

14

Li, Ke Liang, Zhong Zheng Yang, and Wei Ping Nie. "Fiber Reinforced Hydraulic Concrete Using Four Gradations of Aggregates." Advanced Materials Research 243-249 (May 2011): 4614–18. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4614.

Full text

Abstract:

Controlling crack of hyperbolic arch dam with a height of 305 m in Jinping hydropower station is an important problem. To improve the anti-cracking ability and reduce cracking risk of hydraulic concrete, polyvinyl alcohol (PVA) fiber and polypropylene thick fiber were used in hydraulic concrete using four gradations of aggregates. Indoor and productive tests were carried through to comparatively analyze workability, physical and mechanical properties and anti-cracking ability. Workability of fiber reinforced concrete was improved to be in favor of construction. When two kinds of fiber were used in concrete, the anti-cracking ability was greatly enhanced with lower elastic modulus-to-strength ratio and lager ultimate tensile strain. Concrete using PVA fiber had better anti-cracking ability than that of concrete using polypropylene thick fiber. PVA fiber reinforced concrete was applied in Jinping hydropower station. It is proved that PVA fiber reinforced concrete has good properties reaching design requirements of workability, compressive strength, ultimate tensile strain, frost resistance, permeability resistance.

APA, Harvard, Vancouver, ISO, and other styles

15

Wang, Chuan, Li Li Sui, Qing Duo Hao, and Qi Yu Lu. "Experimental Research on the Cracking Behavior of GFRP/Steel Wire Composite Rebar Reinforced Concrete Beam Based on Cracking Mechanics." Applied Mechanics and Materials 252 (December 2012): 17–22. http://dx.doi.org/10.4028/www.scientific.net/amm.252.17.

Full text

Abstract:

The different mechanical property determines the difference on cracking behavior between GFRP/steel wire composite rebar reinforced concrete beams and steel rebar reinforced concrete beams according to cracking mechanics. In order to study the cracking behavior of concrete beams reinforced with GFRP/ steel wire composite rebar, five simply-supported beams were tested under three-point static load. The test variables were beam section size and concrete cover depth. Based on analysis on the test results, the calculation methods of cracking capacity and maximum crack width were proposed, and the limit value of crack width was suggested.

APA, Harvard, Vancouver, ISO, and other styles

16

Bischoff, Peter H., and Richard Paixao. "Tension stiffening and cracking of concrete reinforced with glass fiber reinforced polymer (GFRP) bars." Canadian Journal of Civil Engineering 31, no. 4 (August 1, 2004): 579–88. http://dx.doi.org/10.1139/l04-025.

Full text

Abstract:

Tension stiffening and cracking of axial tension members is evaluated for concrete reinforced with steel (reinforcing ratio ρ = 2.0%) and glass fiber reinforced polymer (GFRP) bars (1.3%, 2.0%, and 2.9%), with shrinkage included in the analysis of the member response. Results show that because of a lower bar stiffness the GFRP-reinforced concrete exhibits greater tension stiffening than steel-reinforced concrete for any given value of axial member strain. Transverse cracking in the GFRP-reinforced concrete does not stabilize until much higher values of axial strain are reached, and longitudinal splitting cracks are also evident before cracking has stabilized. Crack widths in concrete reinforced with GFRP bars are larger because of their lower bar stiffness in combination with an increased crack spacing during the crack development stage. Tension stiffening of cracked reinforced concrete is taken into account using an average stress-strain response with a descending branch to model the concrete in tension. A tension stiffening factor is used to characterize this tensile property with an empirical relationship related to the reinforcing bar stiffness and independent of both concrete strength and reinforcing ratio. Results are also compared with the predicted member response based on the 1978 Comité Euro-International du Béton (CEB) CEB-FIP model code approach and American Concrete Institute (ACI) method of using an effective cracked section property for the transformed concrete area. This comparison shows that both methods are valid only for a limited range of reinforcing ratios.Key words: cracking, crack spacing, crack width, GFRP, reinforced concrete, tension stiffening.

APA, Harvard, Vancouver, ISO, and other styles

17

Li, Chang Yong, Hui Yang, Yang Liu, and Ke Ke Gao. "Flexural Behavior of Reinforced Concrete Beams Superposing with Partial Steel Fiber Reinforced Full-Lightweight Concrete." Applied Mechanics and Materials 438-439 (October 2013): 800–803. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.800.

Full text

Abstract:

To improve the flexural properties and lighten the weight of ordinary reinforced concrete beam (RCB), this paper develops a new type of superposed RCB in which the tensile zone was partially cast with the steel fiber reinforced full-lightweight concrete (SFRFLC). 10 beams with different height of SFRFLC were designed. Their flexural behaviors were measured including the concrete strain at mid-span cross section, the load vs deflection curve, the cracking load and the ultimate load. It may be concluded that the test beams damage in ductile, the concrete strains at mid-span cross section basically fit the assumption of plain cross section, the variations of load vs deflection curves are similar with obvious changes at the points of the cracking of concrete and the yield of tensile reinforcements, the cracking loads are almost equal, and the ultimate loads tends to decrease with the increasing height of SFRFLC. The SFRFLC and ordinary concrete work well together, the suitable height of SFRFLC is there should be further studied.

APA, Harvard, Vancouver, ISO, and other styles

18

Xing, Feng, Fa Guang Leng, and Wei Wen Li. "Properties of Cracking Resistance of Cemfiber Reinforced Concrete." Key Engineering Materials 280-283 (February 2007): 1765–70. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1765.

Full text

Abstract:

Polypropylene fiber is a new measure to prevent plastic cracks of concrete. Effects of the parameters, such as dosage and types of fibers, on the plastic cracks were studied systematically. The properties of cracking resistance of mortar, ordinary concrete and high performance concrete were investigated by using samples of two types in shape. The results show that: (1) polypropylene fibers may increase the cracking resistance of concrete further; (2) as smaller quantity of cement and higher quantity of aggregate as possible should be used to prevent concrete form cracking; (3) the main reason why polypropylene fibers increase cracking resistance of concrete is that they increase strain capacity of concrete at early age, decrease shrinkage strain, improve plastic tensile strength and decrease tensile stress of the capillary.

APA, Harvard, Vancouver, ISO, and other styles

19

Zhang, Peng, Qingfu Li, Yuanzhao Chen, Yan Shi, and Yi-Feng Ling. "Durability of Steel Fiber-Reinforced Concrete Containing SiO2 Nano-Particles." Materials 12, no. 13 (July 7, 2019): 2184. http://dx.doi.org/10.3390/ma12132184.

Full text

Abstract:

An experimental study was conducted to investigate the effect ofnano-SiO2 and steel fiber content on the durability of concrete. Five different dosages of nano-SiO2 particles and five volume dosages of steel fiber were used. The durability of concretes includes permeability resistance, cracking resistance, carbonation resistance, and freezing-thawing resistance, and these were evaluated by the water permeation depth, number of cracks, total cracking area per unit area of the specimens, carbonation depth of the specimens, and the relative dynamic elastic modulus of the specimens after freezing-thawing cycles, respectively. The results indicate that the addition of nano-SiO2 particles significantly improves the durability of concrete when the content of nano-SiO2 is limited within a certain range. With the increase of nano-SiO2 content, the durability of concrete first increases and then decreases. An excessive number of nano-SiO2 particles could have an adverse effect on the durability of the concrete. The addition of the correct amount of steel fibers improves the carbonation resistance of concrete containing nano-particles, but excessive steel fiber reduces the carbonation resistance. Moreover, the addition of steel fibers reduces the permeability resistance of concrete containing nano-particles. The incorporation of steel fiber enhanced the freezing-thawing resistance and cracking resistance of concrete containing nano-particles. With increasing steel fiber content, the freezing-thawing resistance of the concrete containing nano-particles increases, and the cracking resistance of the concrete decreases gradually.

APA, Harvard, Vancouver, ISO, and other styles

20

Gu, Hao Sheng, and Da Yu Zhu. "Flexural Behaviors of Concrete Slab Reinforced with GFRP Bars." Advanced Materials Research 243-249 (May 2011): 567–72. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.567.

Full text

Abstract:

This paper attempts to reveal the flexural behaviors of concrete slab reinforced with GFRP bars. Through flexural test, the deformation process and failure mode of concrete slabs reinforced with GFRP bars and steel bars are examined, respectively. The deflection, cracking load, ultimate load and concrete strain are compared between two kinds of concrete slabs. From the test results, it is clarified that the moment-deflection curve of GFRP reinforced concrete slab can be divided into two stages. Before concrete cracks the behaviors of two kinds of concrete slabs are almost the same. However, the deflection of concrete slabs reinforced with GFRP bars increases much faster after cracking and the stress-strain diagram is linear up to rupture with no discernible yield point. The ultimate load of concrete slabs reinforced with GFRP bars is 1.2 times of that of concrete slabs reinforced with steel bars. Based on the test results, finite element analysis is performed in order to study the influence of reinforcement ratio. Parameter analysis shows that the flexural rigidity of GFRP reinforced concrete slabs increases with the reinforcement ratio after cracking.

APA, Harvard, Vancouver, ISO, and other styles

21

Li, Qiang, Hong Fa Yu, and Jing Tong. "Full-Field Displacement and Strain Measurement: Application of Digital Image Correlation to Reinforcement Corrosion Induced Concrete Fracture and Cover Cracking." Applied Mechanics and Materials 738-739 (March 2015): 889–92. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.889.

Full text

Abstract:

Cracking of the cover concrete due to steel corrosion is considered as one of the major issues of durability of reinforced concrete (RC) structures. This paper tentatively studies the feasibility of DIC to reinforcement corrosion induced concrete fracture and cover cracking measurement. Advantages and limitations of DIC-based non-contact full-field measurement for corrosion induced concrete fracture and cover cracking are discussed. Drawbacks in this test need improvement are pointed out and test method for further study of whole process of simulating the real reinforced concrete cracking is put forward.

APA, Harvard, Vancouver, ISO, and other styles

22

Phan, Duy Nguyen. "A Method for Calculating Cracking Moment of FRP Reinforced Concrete Beam." Key Engineering Materials 896 (August 10, 2021): 141–47. http://dx.doi.org/10.4028/www.scientific.net/kem.896.141.

Full text

Abstract:

This paper presents an analytical method for calculating the cracking moment of concrete beams reinforced with fiber reinforced polymer (FRP) bars, which considers the non-linear behavior of concrete in the tension zone and the contribution of FRP reinforcement. Theoretical cracking moments obtained by the proposed method were verified with the experimental results and the theoretical results calculated according to ACI 440.1R-15. The comparison results show good agreement between theoretical and experimental data. A parametric study on the effect of longitudinal FRP reinforcement ratio and elastic modulus of FRP on the cracking moment of FRP reinforced concrete beams also were done by using the proposed method. The parametric study results show that both longitudinal reinforcement and modulus of elasticity of FRP significantly affect the cracking moment of FRP reinforced concrete beams. Moreover, parametric study results also clarify the weakness of ACI 440.1R-15 in determining the cracking moment of concrete beams reinforced with a large amount of FRP reinforcement ratio and with high modulus of elasticity of FRP.

APA, Harvard, Vancouver, ISO, and other styles

23

Xie, Jian Jun, Jun Lin Tao, Song Gu, Ting Lei, and Wen Jun Hu. "Experimental Research on Flexural Behavior of Recycled Concrete One-Way Slab Reinforced with CFRP." Advanced Materials Research 261-263 (May 2011): 120–24. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.120.

Full text

Abstract:

This paper is supported by National 863 Plans Projects and Sub-project of Science and Technology Department of Sichuan Province, through experimental research on flexural behavior of non-crack recycled concrete one-way slabs reinforced with CFRP, research the ultimate bearing capacity and maximum deflection of it, and comparative analysis the results with recycled concrete one-way slabs which is not been reinforced and reinforced with CFRP after post-cracking. The results show that, the ultimate bearing capacity is higher than the non-crack reinforced concrete slabs, at the same time the deflection is smaller. The ultimate bearing capacity of non-crack recycled concrete one-way slab reinforced with CFRP is lower than post-cracking recycled concrete one-way slab reinforced with CFRP, at the same time the deflection is greater. But found bearing capacity and deflection is lower than that post-cracking recycled concrete one-way slab reinforced with CFRP when experimental on flexural behavior of non-crack recycled concrete one-way slabs reinforced with CFRP, and do a preliminary analysis for this phenomenon.

APA, Harvard, Vancouver, ISO, and other styles

24

Banthia, N., R. Gupta, and S. Mindess. "Development of fiber reinforced concrete repair materials." Canadian Journal of Civil Engineering 33, no. 2 (February 1, 2006): 126–33. http://dx.doi.org/10.1139/l05-093.

Full text

Abstract:

Early age shrinkage cracking remains a critical concern for cement-based repairs and overlays. Fibers mitigate such cracking, but no standardized technique of assessing the performance of a given fiber exists. Recently, a novel technique of making such an assessment was developed at The University of British Columbia (UBC). In this test method, currently being balloted through the ASTM, an overlay of fiber reinforced concrete (FRC) material to be tested is cast directly on a fully matured sub-base with protuberances, and the entire assembly is subjected to controlled drying. Cracking in the overlay is then monitored and characterized. The technique was recently employed to develop "crack-free" overlay materials for two repair sites. One was a parking garage in Downtown Vancouver, British Columbia, and the other was the plaza deck at The UBC Aquatic Center. For the parking garage, a carbon fiber reinforced concrete and for the plaza deck, a cellulose fiber reinforced concrete were developed. Both overlays were instrumented with strain sensors and data were monitored over the Internet.Key words: fiber reinforced concrete, shrinkage cracking, strain monitoring, carbon fibers, cellulose fibers.

APA, Harvard, Vancouver, ISO, and other styles

25

Słowik, Marta. "The analysis of load carrying capacity and cracking of slightly reinforced concrete members in bending." Budownictwo i Architektura 2, no. 1 (June 11, 2008): 065–78. http://dx.doi.org/10.35784/bud-arch.2312.

Full text

Abstract:

Slightly reinforced concrete members are the members made by concrete with reinforcement less than minimum given in codes for reinforced concrete ones. Plain concrete and slightly reinforced concrete members in bending are treated in the same way during the dimensioning and the influence of longitudinal reinforcement on the load carrying capacity is not taken into account. The mechanism of work and crack formation in slightly reinforced concrete members is not completely recognized. The author’s own research program was made. The experiment was aimed at the determination of cracking moment and load carrying capacity of slightly reinforced concrete beams with different reinforcement ratio. Also plain concrete beams and the typical reinforced concrete beam were tested. The analysis of the obtained values of maximum bending moment and crack’s widths was made according to the reinforcement ratio. The analysis of test results shows how the presence of longitudinal steel bars in concrete members, even when reinforcement ratio is low, changes cracking process and influences the value of cracking moment in flexural members. On the basis of test results, the method how to calculate the load carrying capacity of slightly reinforced concrete elements in bending has been proposed.

APA, Harvard, Vancouver, ISO, and other styles

26

Elbadry, Mamdouh M., Hany Abdalla, and Amin Ghali. "Effects of temperature on the behaviour of fiber reinforced polymer reinforced concrete members: experimental studies." Canadian Journal of Civil Engineering 27, no. 5 (October 1, 2000): 993–1004. http://dx.doi.org/10.1139/l00-013.

Full text

Abstract:

Thermal characteristics of fiber reinforced polymer (FRP) reinforcement can be substantially different from those of concrete and conventional steel reinforcement. The influence of this difference on the behaviour of FRP reinforced concrete members is studied in this paper. Concrete beams reinforced with different types of FRP rebars are tested under the effects of temperature gradient while the rotation at the two ends of the beam are restrained. The bending moments and cracking developed by the thermal gradient are monitored. The results are compared with those obtained from tests on beams of the same dimensions but reinforced with steel bars. The behaviour of thermally cracked members is also investigated under mechanical load effects at both service and ultimate load levels. The potential cracking of the concrete cover caused by the transverse thermal expansion of FRP bars is examined by testing concrete cylinders. The experiments show the difference in thermal behaviour of glass and carbon FRP and steel bars.Key words: bond, concrete, cracking (fracturing), fiber reinforced polymers, loads (forces), reinforcement, temperature, tensile strength, thermal expansion, thermal stresses.

APA, Harvard, Vancouver, ISO, and other styles

27

Liang, Jiong Feng, Jian Bao Wang, and Jian Ping Li. "Experimental Research on Bending Performance of Concrete Beams Reinforced with CFRP-PCPs Composite Rebars." Applied Mechanics and Materials 438-439 (October 2013): 804–6. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.804.

Full text

Abstract:

The flexural behavior of concrete beams reinforced with CFRP-PCPs composite rebars was studied. Experimental results showed that the deflection of beams reinforced with highly prestressed prisms is at service loads coMParable to deflection of steel reinforced beam. Flexural cracks of CFRP-PCPs composite rebars reinforced beams are hairline before prism cracking, and widened after the prism cracking. When the concrete beam was reinforced with the prestressed concrete prisms, the crack width decreased as the prestress in the prism increased.

APA, Harvard, Vancouver, ISO, and other styles

28

Yang, Jian Yu, Zhen Lin Mo, Wei Jun Yang, and Wei Tan. "The Research of Anti-Cracking Performance of Ceramists Concrete Beams." Applied Mechanics and Materials 405-408 (September 2013): 2655–59. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2655.

Full text

Abstract:

This paper displays the crack load failure pattern and influences on crack load of reinforced ceramists concrete beams in different reinforcement ratio, concrete cover thickness and diameter of rebar through the experimental study of bending anti-cracking property of 8 reinforced ceramists concrete beams, and proposes the method of calculation cracking moment of normal section for ceramists concrete beam.

APA, Harvard, Vancouver, ISO, and other styles

29

Jalal, Asif, Luqmanul Hakim, and Nasir Shafiq. "Mechanical and Post-Cracking Characteristics of Fiber Reinforced Concrete Containing Copper-Coated Steel and PVA Fibers in 100% Cement and Fly Ash Concrete." Applied Sciences 11, no. 3 (January 25, 2021): 1048. http://dx.doi.org/10.3390/app11031048.

Full text

Abstract:

This experimental study investigated the effects of polyvinyl alcohol (PVA) and copper-coated steel (CCS) on the mechanical properties and the post cracking behavior of fiber reinforced concrete (FRC). In designing high-performance concrete mixes, cement replacement materials are the essential ingredients. Therefore, the research objective was to investigate PVA and CCS fiber’s post-cracking performance in 100% cement concrete and concrete with 80% cement and 20% fly ash. The fiber content was fixed as a 0.3% volumetric fraction. CSS fibers required 15% more superplasticizer to achieve the desired slump of fresh concrete than the PVA fibers. Simultaneously, CCS fibers showed a 10% higher compressive strength than the concrete made of PVA fibers. Both fibers exhibited a similar effect in developing tensile and flexural strength. PVA fibers showed a value of 47 Gpa of secant modulus, and CCS fibers resulted in 37 Gpa in 100% cement concrete. In post-cracking behavior, CCS fibers showed better performance than the PVA fibers. The reason for this is that CCS showed 2.3 times the tensile strength of the PVA fibers. In comparing the two concretes, fly ash concrete showed about 10% higher compressive strength at 56 days and about 6% higher tensile and flexural strength. Similarly, fly ash concrete showed more than 15% first crack strength and flexural toughness than the 100% cement concrete in post-cracking behavior. Fiber-reinforced concrete containing PVA or CCS fibers showed enhanced post-cracking characteristics and its use could be preferred in structural applications.

APA, Harvard, Vancouver, ISO, and other styles

30

Haddad, Rami H., and Ahmed M. Ashteyate. "Role of synthetic fibers in delaying steel corrosion cracks and improving bond with concrete." Canadian Journal of Civil Engineering 28, no. 5 (October 1, 2001): 787–93. http://dx.doi.org/10.1139/l01-037.

Full text

Abstract:

An experimental study was conducted to investigate the bond behavior between corroding reinforcing steel and surrounding synthetic fiber reinforced concrete. Pullout concrete and fiber reinforced concrete specimens were prepared at concrete cover to steel bar diameter ratios of 3.1 and 3.7 with three embedded lengths of 100, 200, and 300 mm. Fiber reinforced concrete was prepared using polypropylene at 0.15% and 0.30% or nylon fibers at 0.3% by mix volume. After moist curing for 90 days, pullout specimens, originally contaminated by up to 11 kg/m3 NaCl, were subjected to a special treatment to accelerate corrosion in steel. The bond stressslippage relationship was evaluated at different corrosion levels. The findings indicated that the use of fibers delayed initiation of cracking, due to steel corrosion, and improved the ultimate bond strength at cracking and post-cracking stages. The percentage improvement in ultimate bond strength at the latter stages reached as high as 52% and 87%, respectively. It was noticed that, prior to cracking, corrosion of steel bars resulted in an increase in bond strength, regardless of the concrete cover to bar diameter ratio used, or whether fibers were used or not. After cracking (due to steel corrosion), pullout specimens prepared with polypropylene fibers showed better resistance than that of corresponding ones with nylon fibers.Key words: fibers, reinforced concrete, corrosion, cracking, bond strength, slippage.

APA, Harvard, Vancouver, ISO, and other styles

31

G. Karayannis, Chris, Parthena-Maria K. Kosmidou, and Constantin E. Chalioris. "Reinforced Concrete Beams with Carbon-Fiber-Reinforced Polymer Bars—Experimental Study." Fibers 6, no. 4 (December 14, 2018): 99. http://dx.doi.org/10.3390/fib6040099.

Full text

Abstract:

Innovative reinforcement as fiber-reinforced polymer (FRP) bars has been proposed as alternative for the substitution of the traditional steel bars in reinforced concrete (RC) structures. Although the advantages of this polymer reinforcement have long been recognised, the predominantly elastic response, the reduced bond capacity under repeated load and the low ductility of RC members with FRP bars restricted its wide application in construction so far. In this work, the behavior of seven slender concrete beams reinforced with carbon-FRP bars under increasing static loading is experimentally investigated. Load capacities, deflections, pre-cracking and after-cracking stiffness, sudden local drops of strength, failure modes, and cracking propagation have been presented and commented. Special attention has been given in the bond conditions of the anchorage lengths of the tensile carbon-FRP bars. The application of local confinement conditions along the anchorage lengths of the carbon-FRP bars in some specimens seems to influence their cracking behavior. Nevertheless, more research is required in this direction. Comparisons of experimental results for carbon-FRP beams with beams reinforced with glass-FRP bars extracted from recent literature are also presented and commented. Comparisons of the experimental results with the predictions according to ACI 440.1R-15 and to CSA S806-12 are also included herein.

APA, Harvard, Vancouver, ISO, and other styles

32

Khalfallah, S. "Cracking analysis of reinforced concrete tensioned members." Structural Concrete 7, no. 3 (September 2006): 111–16. http://dx.doi.org/10.1680/stco.2006.7.3.111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Ramos, Ismael Sánchez, Omar Aït-Salem Duque, M’Consuelo Huerta Gómez de Merodio, and Natalia Pozhilova. "Cracking study of a reinforced concrete beam." Procedia Structural Integrity 1 (2016): 257–64. http://dx.doi.org/10.1016/j.prostr.2016.02.035.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Channakeshava, C., and K. T. Sundara Raja Iyengar. "Elasto‐plastic Cracking Analysis of Reinforced Concrete." Journal of Structural Engineering 114, no. 11 (November 1988): 2421–38. http://dx.doi.org/10.1061/(asce)0733-9445(1988)114:11(2421).

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Li, Chun Xia, and Shi Lin Yan. "Minimum Reinforcement Ratio of Concrete Beams Reinforced with FRP Bars." Advanced Materials Research 282-283 (July 2011): 553–56. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.553.

Full text

Abstract:

Based on the non-linearity stress strain relation of concrete, the cracking moment of plain flexural concrete member is established, and the flexural capacity of concrete beams reinforced with FRP bars is also obtained under FRP rupture-controlled failure. To prevent FRP rupture failure upon concrete cracking, the minimum reinforcement ration should be derived from simplified calculation, which may provide some theoretic guidance on design and construction for concrete structure reinforced with FRP bars.

APA, Harvard, Vancouver, ISO, and other styles

36

Solov’ev, S. A., and O. V. Yarygina. "RELIABILITY ANALYSIS OF REINFORCED CONCRETE FLEXURAL ELEMENT ON CRACKING BASED ON FRACTURE MECHANICS." Spravochnik. Inzhenernyi zhurnal, no. 283 (October 2020): 40–44. http://dx.doi.org/10.14489/hb.2020.10.pp.040-044.

Full text

Abstract:

The article describes a probabilistic approach to the reliability analysis of a flexural reinforced concrete element by the cracking criterion using the provisions of fracture mechanics. Two mathematical models of limit state are proposed for reliability analysis: with the evaluation of the critical stress intensity coefficient directly and through the design concrete compressive strength. On the basis of regression analysis, the relationship between the critical stress intensity coefficient and the design concrete compressive strength is established which can be used in the inspection of reinforced concrete structural elements. The influence of the design concrete compressive strength on the failure (cracking) probability of the flexural reinforced concrete element is analyzed. The numerical example of reliability analysis is given for the reinforced concrete beam by the criterion of cracking. It is noted that the required level of reliability should be set for each structural object individually based on the acceptable risk value using economic and non-economic losses.

APA, Harvard, Vancouver, ISO, and other styles

37

Solov’ev, S. A., and O. V. Yarygina. "RELIABILITY ANALYSIS OF REINFORCED CONCRETE FLEXURAL ELEMENT ON CRACKING BASED ON FRACTURE MECHANICS." Spravochnik. Inzhenernyi zhurnal, no. 283 (October 2020): 40–44. http://dx.doi.org/10.14489/hb.2020.10.pp.040-044.

Full text

Abstract:

The article describes a probabilistic approach to the reliability analysis of a flexural reinforced concrete element by the cracking criterion using the provisions of fracture mechanics. Two mathematical models of limit state are proposed for reliability analysis: with the evaluation of the critical stress intensity coefficient directly and through the design concrete compressive strength. On the basis of regression analysis, the relationship between the critical stress intensity coefficient and the design concrete compressive strength is established which can be used in the inspection of reinforced concrete structural elements. The influence of the design concrete compressive strength on the failure (cracking) probability of the flexural reinforced concrete element is analyzed. The numerical example of reliability analysis is given for the reinforced concrete beam by the criterion of cracking. It is noted that the required level of reliability should be set for each structural object individually based on the acceptable risk value using economic and non-economic losses.

APA, Harvard, Vancouver, ISO, and other styles

38

Annamaneni, Krishna Kiran, Bhumika Vallabhbhai Dobariya, and Krasnikovs Andrejs. "CONCRETE, REINFORCED BY CARBON FIBRE COMPOSITE STRUCTURE, LOAD BEARING CAPACITY DURING CRACKING." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (June 17, 2021): 232–37. http://dx.doi.org/10.17770/etr2021vol2.6655.

Full text

Abstract:

Different authors conducted studies on fiber reinforced concretes (FRC) with carbon fibres of different lengths and some results showed that concrete mix with homogeneously distributed short fibres in their volume have good strength and ultra-strain compared to normal plain concrete mix. However, this study is focused more on 3-dimensional (3D) carbon fibre reinforced plastic (epoxy) CFRP composite thin rods frame used as a reinforcement in concrete which shows good increase in loadbearing and ductility. Were investigated concrete mixes with superplasticizer, nano-silica, quartz sand, fine natural sand and gravels. Diagonal cross bracing carbon fibre epoxy frames were used as a reinforcement giving better ductility results. Proposed study approach is to show that the reinforced concrete with provided materials have an increased performance in terms of ductility, sustainability, and load bearing in cracked statement. Total, four groups of concrete and each group with three beams were casted and tested in this experiment, three groups with three different shapes of carbon frames and three beams without frames to compare the mechanical properties after 28 days. Failure mechanisms in any particular case were analysed.

APA, Harvard, Vancouver, ISO, and other styles

39

Ju, Hyunjin, Sun-Jin Han, Dichuan Zhang, Jong Kim, Wei Wu, and Kang Su Kim. "Estimation of Minimum Torsional Reinforcement of Reinforced Concrete and Steel Fiber-Reinforced Concrete Members." Advances in Materials Science and Engineering 2019 (March 10, 2019): 1–10. http://dx.doi.org/10.1155/2019/4595363.

Full text

Abstract:

The current code specifies a minimum torsional reinforcement ratio to prevent possible brittle failure after torsional cracking in concrete members. However, since there are many researches, in which even the concrete members with the minimum torsional reinforcement fail to secure sufficient reserved strength after torsional cracking, continuous research needs to be carried out. Accordingly, in the authors’ previous research, a minimum torsional reinforcement ratio was proposed based on the reserved strength concept and was extended to the steel fiber-reinforced concrete members in order to suggest the minimum fiber factor as the minimum torsional reinforcement ratio. In the present study, a pure torsion test was carried out on reinforced concrete and steel fiber-reinforced concrete members after a brief introduction on the above, and the proposed model was verified based on the test results. The test results of six torsional specimens were compared with those of the proposed model, and it was found that the proposed model provides a reasonable evaluation on the torsional failure mode of the specimen according to the reserved strength ratio.

APA, Harvard, Vancouver, ISO, and other styles

40

Vecchio, F. J., N. Agostino, and B. Angelakos. "Reinforced concrete slabs subjected to thermal loads." Canadian Journal of Civil Engineering 20, no. 5 (October 1, 1993): 741–53. http://dx.doi.org/10.1139/l93-099.

Full text

Abstract:

Eight large-scale reinforced concrete slab specimens were tested under combined thermal and mechanical load conditions. The specimens varied in the amount and orientation of the in-plane reinforcement provided. A three-phase loading regime was used to investigate thermal gradient effects at service and ultimate load conditions. The slabs experienced significant levels of stressing and cracking as a result of restrained thermal deformations. However, reductions in stiffness due to cracking and thermal creep caused rapid decays in the restraint forces developed. At ultimate load conditions, thermal load effects were minimal. Nonlinear finite element analysis procedures were used to investigate the theoretical response of the test slabs. Fairly accurate simulations of the specimens' behaviour were obtained. Important to achieving accurate results were the consideration of tension stiffening effects and out-of-plane shear behaviour. Key words: analysis, cracking, finite elements, plates, reinforced concrete, slabs, temperature, tests, thermal gradients.

APA, Harvard, Vancouver, ISO, and other styles

41

Wang, Yan Ming, Wen Wen Yang, Yong Sun, and Ke Liu. "Research on Compact Resistance Performance of Flexible Fiber and Rigid Fiber Reinforced Concrete." Advanced Materials Research 430-432 (January 2012): 277–80. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.277.

Full text

Abstract:

The fiber reinforced concrete with flexible fiber and rigid fiber respectively added into C30 plain concrete, curing under standard condition for 28 days, was used for impact resistance performance experiment. The flexible fiber is American Dura fiber and Chinese nylon fiber. The rigid fiber is Chinese steel fiber. The impact resistance property was evaluated by initial cracking times, final cracking times and impact toughness. The result shows that the impact toughness of steel fiber concrete, Dura fiber concrete and nylon fiber concrete is respectively 15.1, 3.4 and 2.7 times of the plain concrete. The fiber reinforced concrete improves the impact resistance property compared with the plain concrete. The impact resistance of rigid steel fiber reinforced concrete is increased greatly.

APA, Harvard, Vancouver, ISO, and other styles

42

Aiello, M., M. Leone, and L. Ombrse. "Cracking analysis of fibre-reinforced polymer-reinforced concrete tension members." Proceedings of the Institution of Civil Engineers - Structures and Buildings 157, no. 1 (January 2004): 53–62. http://dx.doi.org/10.1680/stbu.2004.157.1.53.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Chen, Xiang, Bo Wang Chen, and Ran He. "The Feasibility Experimental Study about Bamboo Reinforcement Applied in Concrete Pavement." Applied Mechanics and Materials 204-208 (October 2012): 1697–701. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.1697.

Full text

Abstract:

As a result of plain concrete pavement cracking phenomenon is more serious, leading to the late maintenance and repair costs are higher, resulting in the national great economic losses, it has taken many measures to alleviate the damage of pavement, of which the most widely used reinforced concrete. The use of reinforced concrete materials can effectively delay the pavement cracking phenomenon, but its cost is high. In this paper we consider the use of bamboo reinforcement in concrete pavement instead of steel, and compare the bending test of the two kids of board, the bamboo reinforced concrete board and a concrete board. The experiment indicated that, compared with ordinary concrete board, the ultimate strength of bamboo reinforced concrete plate has been grew 87.5%, and reinforced concrete plate has certain signs before failure, so the concrete reinforced with bamboo ribs can prolong the concrete crack time, but also greatly improve the concrete pavement flexural strength and crack resistance. Bamboo reinforcement applied in concrete pavement is entirely feasible, and it is good of the application development prospect about bamboo reinforcement.

APA, Harvard, Vancouver, ISO, and other styles

44

Yavaş, Altuğ, Umut Hasgul, Kaan Turker, and Tamer Birol. "Effective fiber type investigation on the shear behavior of ultrahigh-performance fiber-reinforced concrete beams." Advances in Structural Engineering 22, no. 7 (January 3, 2019): 1591–605. http://dx.doi.org/10.1177/1369433218820788.

Full text

Abstract:

In this study, the effects of different fiber types on shear behavior (cracking pattern, shear cracking strength, ultimate shear strength, and post-cracking deformability) of ultrahigh-performance fiber-reinforced concrete beams were investigated experimentally. For this purpose, 15 ultrahigh-performance fiber-reinforced concrete beams including different steel fiber types (two straight, two hooked, and one double hooked) with three volume fractions (0.5%, 1.0%, and 1.5%) were casted without shear reinforcement and tested under four-point loading until the failure. In addition to the experimental program, three existing numerical models proposed for the shear capacity of fiber-reinforced concrete beams were investigated to show the applicability of these models to the ultrahigh-performance fiber-reinforced concrete beams. The experimental results demonstrated that the straight fiber of 13 mm is the most effective fiber type in terms of the considered parameters. However, the addition of 13-mm straight fiber with 1.5% by volume into the ultrahigh-performance fiber-reinforced concrete beam changed the failure mode from the shear to flexure without shear reinforcement.

APA, Harvard, Vancouver, ISO, and other styles

45

Figueiredo, M. P., S. Maghous, and A. Campos Filho. "A multiphase model for reinforced concrete structures considering the concrete cracking." Revista IBRACON de Estruturas e Materiais 4, no. 2 (June 2011): 179–90. http://dx.doi.org/10.1590/s1983-41952011000200003.

Full text

Abstract:

Assessing the global behavior of reinforced materials from the individual properties of their components has been the subject of a considerable amount of experimental and theoretical works in the last years. The so-called multiphase model is an alternative generalization of the homogenization method and it relies upon the idea that, at the macroscopic scale, the reinforced concrete is a geometrical superposition of the matrix phase (concrete) and the reinforcing phase (steel bars). This technique was already successfully employed in several geotechnical structures. Considering the particular case of concrete structures, Figueiredo et al [1] analyzed the mechanical behavior of reinforced concrete flat slabs under prescribed loading using the multiphase model in elastoplasticity. The present contribution extents a previously numerical code to account for concrete cracking based on a smeared crack approach. Comparison with direct simulation results emphasizes the advantage of such multiphase model in terms of reduced computational cost.

APA, Harvard, Vancouver, ISO, and other styles

46

Chen, Xu Jun, Xiao E. Zhu, and Zhong Yang. "Study on Cracking Load of Normal Section for Concrete Beams Strengthened with BFRP Sheet." Applied Mechanics and Materials 578-579 (July 2014): 1343–46. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.1343.

Full text

Abstract:

Based on the calculation method of cracking load for reinforced concrete beam, the formula to calculate cracking load of normal section for concrete beams strengthened with BFRP sheet is established. The cracking load experiment of seven concrete beams strengthened with BFRP and three concrete beams strengthened with CFRP is conducted, and the results showed that fiber sheet layers and fiber sheet types have little effect on cracking load of concrete beams strengthened, the cracking load of beams strengthened mainly depends on the strength of concrete. The comparison between estimated values and test values of concrete beams strengthened indicates that the estimated values are slightly smaller, the formula can be used to calculate the cracking load of concrete beams strengthened.

APA, Harvard, Vancouver, ISO, and other styles

47

Li, Dan, Yu Ye Xu, Zheng He Qiu, and Yong Lin Zheng. "Numerical Simulation on the Torsion Behavior of '+'-Shaped Columns under the Actions of Pressure and Torque." Applied Mechanics and Materials 105-107 (September 2011): 796–99. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.796.

Full text

Abstract:

Nonlinear finite element analysis (FEA) for the torsion behavior of reinforced concrete '+'-shaped columns with various axial load ratios was carried out by the general software ANSYS. Then a comparison between the FEA calculations and the test results is made. The numerical examples show that: (1) the cracking torque and ultimate torque of reinforced concrete '+'-shaped columns under the combined actions of axial force and torque can be predicted with a reasonable accuracy. (2) the axial ratio has significant effects on the torsion behavior '+'-shaped columns. The cracking torque and ultimate torque of '+'-shaped columns increase with an increase of axial load ratio. Comparing with reinforced concrete '+'-shaped column with an axial load ratio of 0.063, the cracking torque and ultimate torque of reinforced concrete '+'-shaped columns with axial load ratios of 0.189 and 0.314 were increased by 28.3% and 71.9%, 79.4% and 96.0%, respectively.

APA, Harvard, Vancouver, ISO, and other styles

48

Ji, Haodong, Haoyu Jiang, Ruoyi Zhao, Ye Tian, Xianyu Jin, Nanguo Jin, and Jing Tong. "Fractal Characteristics of Corrosion-Induced Cracks in Reinforced Concrete." Materials 13, no. 17 (August 22, 2020): 3715. http://dx.doi.org/10.3390/ma13173715.

Full text

Abstract:

Based on the fractal geometry, a quantitative index describing the development degree of the internal corrosion expansion of reinforced concrete was proposed. This approach could describe the similarity and complexity of the development of corrosion-induced cracks in concrete simultaneously. Based on this approach, the influence of cracking pattern and coarse aggregate distribution on crack distribution was investigated. This study obtained the crack distribution of reinforced concrete by using the half-soaking galvanic accelerated corrosion method. The results showed that the cracking pattern was the main factor affecting the complexity of crack distribution. For cracks with the simplest cracking pattern, the presence of coarse aggregate and its surface irregularity greatly affected their development trend.

APA, Harvard, Vancouver, ISO, and other styles

49

Li, Chang Yong, Guang Xin Li, Wen Jing Shao, Qi Guo, and Rui Liu. "Shear-Crack Behaviors of Reinforced Full-Recycled Aggregate Concrete Beams." Applied Mechanics and Materials 438-439 (October 2013): 794–99. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.794.

Full text

Abstract:

On the basis of experimental results, this paper discusses the shear-crack behaviors such as shear-cracking force and shear-crack width of reinforced full-recycled aggregate concrete beams. The full-recycled aggregate concrete was developed for the sustainable development in civil engineering, in which the coarse aggregate was the recycled aggregate made of abandoned concrete, and the fine aggregate was the machine-made sand. Sixteen beams, six of them without stirrups, were tested with the shear-span ratio varying as 1.5, 2.0 and 3.0, and the ratio of stirrups varying from 0.19% to 0.35%. The results showed that the shear-cracking force of the beam was mainly affected by the shear-span ratio, the width of shear-cracks intersecting stirrups decreased with the increasing ratio of stirrups, but the maximum crack width almost exceeded the limit 0.3mm in the first class environmental condition specified in Chinese code GB50010-2010. Comparing the calculation results by substituting the test parameters of full-recycled aggregate concrete beams into the formula of ordinary reinforced concrete beams, the lower resistance of reinforced recycled concrete beam to shear-cracking, and the larger crack width intersecting stirrups should be noted in the structural design. Based on the test data, the formula for calculating the shear-cracking force and the shear-crack width of reinforced full-recycled aggregate concrete beams are suggested.

APA, Harvard, Vancouver, ISO, and other styles

50

Li, Yan Hui, Yang Yang Zhang, Jing Cun Wei, and Yun Feng Wu. "Analysis on Concrete Neutralization and Life Evaluation of Reinforced Concrete Chimney." Advanced Materials Research 671-674 (March 2013): 1672–75. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1672.

Full text

Abstract:

Through calculation and analysis on routine examination and neutralization of reinforced concrete chimney, the service life of concrete structure was evaluated only considering neutralization of concrete single factor. The results show that the neutralization of the reinforced concrete chimney was serious than that of other similar projects. The initiation time of reinforcement corrosion were 19.3a, cracking time of concrete cover were 27.35a.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Reinforced concrete – Cracking'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles