Journal articles: 'Ribbed slab'

1

Zhang, Jing Shu, Huan Huan Nie, Yuan Long Yang, and Yuan Yao. "Research and Application of Pre-Stressed Concrete Composite Slabs." Applied Mechanics and Materials 166-169 (May 2012): 131–39. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.131.

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The pre-stressed concrete composite slab, which combines the advantages of cast-in-place slabs and precast slabs, has promising development prospects. In the paper, according to structural integrity, bond performance, sound insulation, thermal preservation and construction techniques, four categories composite slab, such as the composite slab with flat bottom panel (including the composite slab with bar truss reinforced precast concrete bottom panel), the concrete composite slab with precast ribbed panel, the composite slab with hollow bottom panel and the composite slab with sandwich bottom panel are studied. The composite slab with flat bottom panel has poor structural integrity, and its bond performance and crack resistance of edge joint details need to be improved; the composite slab with bar truss reinforced precast concrete bottom panel has enough bond force, but its storage and transportation are inconvenient; the concrete composite slab with precast ribbed panel has good structural integrity and convenient construction procedure; the composite slab with hollow bottom panel and the composite slab with sandwich bottom panel have functions of sound insulation and thermal preservation, however they are inadequacy to resist bending moment and have complex construction procedure. The concrete composite slab with precast ribbed panel is provided with good mechanical behavior, economy and practicability, and is worth further researching and promoting.

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Shi, X. M., C. S. Cai, George Voyiadjis, and Zhongjie Zhang. "Design of Ribbed Concrete Approach Slab Based on Interaction with the Embankment." Transportation Research Record: Journal of the Transportation Research Board 1936, no. 1 (January 2005): 181–91. http://dx.doi.org/10.1177/0361198105193600121.

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To alleviate the “bump” problem at bridge ends, a ribbed concrete approach slab (similar to slab-on-beam bridge decks) was proposed in place of the pile–column-supported approach span or flat slab system. The effect of given embankment settlement on the structural performance of a ribbed concrete approach slab with a span length of 60 ft and a width of 40 ft was investigated. The approach slab was modeled as a ribbed slab with a beam spacing of 32, 16, and 12 ft. A three-dimensional finite element analysis was conducted to model the interaction between the approach slab and the embankment soil. Finite element modeling techniques that simulate the separation of the slab and soil provide information on the effect of the embankment settlement on structural performance and beam design. The predicted internal forces provide design engineers with a scientific basis to design the approach slab properly, considering different levels of embankment settlements. Current AASHTO code specifications do not provide guidelines to design approach slabs considering the embankment settlement.

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Han, Gui Hua, Bing Wei Gao, Yun Fei Wang, Gui Tao Sun, Di Wu, and Jun Peng Shao. "Optimization Design on Ribbed Slab for Crossbeam of Heavy NC Gantry Moving Boring & Milling Machine." Applied Mechanics and Materials 121-126 (October 2011): 3386–90. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3386.

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In order to improve the dynamic characteristics of crossbeam of heavy NC gantry moving boring & milling machine, the ribbed slab structure of beam were analyzed and optimized with the finite element analysis software, and the comprehensive optimization method of the number, size and layout of ribbed slab were putted forward based on the classification of ribbed slab structure. According to the result of the finite element analysis, the internal type and horizontal spacing of ribbed slab are optimized to get the best number, spacing, thickness and height of ribbed slab; Under the required intensity, stiffness and stability conditions materials are distributed reasonably to reduce beam weight which make little deformation and the uniform stress distribution. The comprehensive optimization method study has reference value for ribbed slab structure design.

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Buka-Vaivade, Karina, Dmitrijs Serdjuks, Janis Sliseris, Andrejs Podkoritovs, and Raimonds Ozolins. "TIMBER-CONCRETE COMPOSITE RIBBED SLABS WITH HIGH-PERFORMANCE FIBRE-CONCRETE." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 16, 2021): 40–44. http://dx.doi.org/10.17770/etr2021vol3.6551.

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Composite of such renewable material as timber and the most popular man-made material as concrete offers many benefits. Such of them are high load-bearing capacity with low dead load and increased structural bending stiffness. Higher specific strength of high-performance concrete in comparison with ordinary concrete ensures more efficient use of the material. Addition of fibres can reduce the fragility and autogenous shrinkage cracks of high-performance concrete and makes it possible to design thinner layers of concrete for timber-concrete composite structures. Ribbed slabs as solution for the floor slabs, allows to reduce material consumption and to integrate engineering communications into the structures. The current study focuses on determining the effect of the use of high-performance fibre reinforced concrete for timber-concrete composite ribbed slabs with adhesive connection between layers, as the most effective connection type for composite action. The effect of the use of high-performance fibre reinforced concrete is determined by comparison of mid-span displacements of the ribbed slabs numerical models. Three-dimensional finite element models of timber and ordinary concrete composite ribbed slab and high-performance fibre reinforced concrete with additional longitudinal reinforcement ribbed slab are validated by experiment data. Developed numerical models makes it possible to predict the dependence of applied load on mid-span displacement in three-point bending with sufficient precision. Obtained results showed, that replacement of ordinary concrete layer by high-performance fibre reinforced concrete in timber-concrete composite ribbed slab with adhesive connection up to 1.68 times decrease vertical mid-span displacements.

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Qiu, Ji Sheng, and Guang Hong Xiong. "Pseudo-Plate Method of High-Strength Steel Fiber Concrete Multi-Ribbed Slab." Advanced Materials Research 368-373 (October 2011): 1626–31. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1626.

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Basing on the disadvantages of multi-ribbed slab in practice, a new high-strength steel fiber concrete (HSFC) composite multi-ribbed slab structure is introduced. Because adding steel fibers can improve the capacity of the concrete, it also can make some influence on the mechanic performance of HSFC multi-ribbed slab, such as elastic module, shear module, flexural rigidity, and torsion rigidity and so on. So by the analysis of the material and mechanic capacity and considering the influence of steel fiber, the formulas to calculate flexural rigidity, torsion rigidity, deflection and internal force of the new composite slab are given, in which the multi-ribbed slab is equivalent to orthotropic slab by the principle of stiffness coincidence. The study in this paper can provide some valuable theory references for further study and application of multi-ribbed slab.

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Zhao, Dong Qi, Yi Jun Tang, Hui Li, Gui Feng Song, and Feng Ling Guan. "The Application Research of Reinforced Concrete Multi-Ribbed Hollow Composite Slab in the Road Slab Culvert." Advanced Materials Research 368-373 (October 2011): 307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.307.

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Reinforced concrete cover in the road culvert cover design, in order to facilitate the construction, usually using precast reinforced concrete solid slab, but the overall cost is not low. This article researched a reinforced concrete multi-ribbed hollow composite slab, it based on the theory of reinforced concrete multi-ribbed slab structures, using a precast reinforced concrete ribbed slab as the bottom die, then poured reinforced concrete beams and panels rib ,and them constituted a whole stack of reinforced concrete ribbed hollow slab. This kind of cover, compared with the precast reinforced concrete solid cover, is not only good mechanical properties, high integrity, but also saving concrete, steel, and bottom slab appeared smooth and fine, lower construction cost.

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Samsudin, Amir Syafiq, Mohd Hisbany Mohd Hashim, Siti Hawa Hamzah, Afidah Abu Bakar, and Mohamad Firdaus Mohamad. "Modelling of Steel Fibre Reinforced Concrete Ribbed Slab under Multiple Ribbed Condition." Advanced Materials Research 1134 (December 2015): 127–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1134.127.

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Nowadays, demands in the application of fiber in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction of ribbed slab reduces the material and thus the cost but the strength of the structure also reduce due to the reducing material. This paper will focus on modelling behavior of ribbed slab reinforced with steel fibre using Lusas Modeller. The structure design is in full aspect to optimize the function of steel fibre and the slab rib capability. This research focus on modelling of multiple type of steel fibre ribbed slab consist of two ribbed slab, and also three ribbed slab in similar size of 1500mm x 1000mm x 75mm using concrete Grade 30. Load was applied until failure under three point loading system. It is importance to find the ultimate strength of the sample and the behavior of structure under vertical stress. Steel fibre is expected to reduce the issue of micro crack and enhance the performance of concrete.

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Li, B., X. Y. Ren, Y. Q. Lin, and L. L. Liu. "Fire Behavior of Continuous Assembled Monolithic Hollow-Ribbed Slabs." Advances in Civil Engineering 2020 (September 7, 2020): 1–14. http://dx.doi.org/10.1155/2020/2940894.

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To further understand the fire behavior of assembled monolithic hollow-ribbed (AMH) slab floor, a fire test was performed on six small-scale continuous AMH slabs (two by three). In this paper, the special designed furnace and relevant experimental phenomena are briefly introduced. Detailed experimental results in the form of furnace temperatures, temperature distributions, vertical deflections, and failure criteria are presented. The test data indicate that almost all the AMH slabs showed upward displacements during the fire tests, which is very distinct with the isolated AMH slab under fire. As the edge girders transformed into the frame girders gradually, the edge girders would show displacement plateaus. The integrity of the AMH slab under elevated temperature should receive more critical role to serve as its failure criterion compared with the load bearing function. Except fire environment, boundary constraint conditions also have a considerable effect on the elevated temperature deformations of the structural elements. At last, several rational suggestions are provided to improve the fire resistance of the AMH slabs.

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Yuan, Hai Jun, Lang Cao, and Liang Hao Deng. "Research on Out-Plane Bending Stiffness of Multi-Ribbed Slab Structure." Advanced Materials Research 838-841 (November 2013): 597–600. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.597.

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Floor loads of the large-bay floor can cause larger bending moment at the floor edges. So the shear-wall need to bear greater out-plane bending moment and this problem can not be ignored. multi-ribbed slab structure is a new wall. The paper Calculated out-plane bending-stiffness of multi-ribbed slab by using the equivalent-stiffness method. The results show that: the equivalent stiffness method is simple and ribbs should not be too large, width-height ratio control between 1 and 3, wall length is about 5.4m.

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SAMSUDIN, AMIR SYAFIQ, MOHD HISBANY MOHD HASHIM, SITI HAWA HAMZAH, and AFIDAH ABU BAKAR. "Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel." Scientific Research Journal 15, no. 1 (March 30, 2018): 15. http://dx.doi.org/10.24191/srj.v15i1.4165.

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Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction of ribbed slab reduces concrete materials and thus the cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2. The slab was tested under three-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. This research shows that SFRC Ribbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

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Samsudin, Amir Syafiq, Mohd Hisbany Mohd Hashim, Siti Hawa Hamzah, and Afidah Abu Bakar. "Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel." Scientific Research Journal 15, no. 1 (June 1, 2018): 15. http://dx.doi.org/10.24191/srj.v15i1.9353.

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Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction of ribbed slab reduces concrete materials and thus the cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2. The slab was tested under three-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. This research shows that SFRC Ribbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

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12

Li, Yun Zhang, and Jia Ding Wang. "Homogenization-Based Investigation on Equivalent Constitutive Relationship of Multi-Ribbed Slab Wall." Advanced Materials Research 1049-1050 (October 2014): 434–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.434.

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Multi-ribbed slab structure (MRSS) is a new structural system developed in recent years, with multi-ribbed slab wall as its main bearing member, which was an orthogonal anisotropic solid constituted by reinforced concrete ribs, frame and embedded solid body. It was suggested to employ asymptotic expansion-based homogenization method to establish the equivalent homogenized model. The method is that it considers the impact of rib relative width and the possion. The research results showed that: the macroscopic constitutive relationship of multi-ribbed wall based by the method has certain accuracy, can provide basis for multi-ribbed slab structure FEM analysis.

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13

SUPARLAN, NUR AIMAN, MUHAMMAD AZRUL KU AYOB, HAZRINA AHMAD, SITI HAWA HAMZAH, and MOHD HISBANY MOHD HASHIM. "Preliminary Investigation on the Flexural Behaviour of Steel Fibre Reinforced Self-Compacting Concrete Ribbed Slab." Scientific Research Journal 15, no. 1 (June 30, 2018): 31. http://dx.doi.org/10.24191/srj.v15i1.4166.

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A ribbed slab structure has the advantage in the reduction of concrete volume in between the ribs resulting in a lower structural self-weight. In order to overcome the drawbacks in the construction process, the application of steel fibre self-compacting concrete (SCFRC) is seen as an alternative material to be used in the slab. This preliminary investigation was carried out to investigate the flexural behaviour of steel fibre selfcompacting concrete (SCFRC) as the main material in ribbed slab omitting the conventional reinforcements. Two samples of ribbed slab were prepared for this preliminary study; 2-ribbed and 3-ribbed in 1 m width to identify the effect of the geometry to the slab’s flexural behaviour. The dimension of both samples is 2.5 m x 1 m with 150 mm thickness. The compressive strength of the mix is 48.6 MPa based on the cubes tested at 28 days. Load was applied to failure by using the four point bending test set-up with simple support condition. The result of the experiment recorded ultimate load carrying capacity at 30.68 kN for the 2-ribbed slab and 25.52 kN for 3-ribbed slab. From the results, the ultimate load of the 2-ribbed sample exceeds 3-ribbed by approximately 20%. This proved that even with lower concrete volume, the sample can still withstand an almost similar ultimate load. Cracks was also observed and recorded with the maximum crack width of 2 mm. It can be concluded that the steel fibres do have the potential to withstand flexural loadings. Steel fibre reduces macro-crack forming into micro-cracks and improves concrete ductility, as well as improvement in deflection. This shows that steel fibre reinforced self-compacting concrete is practical as it offers good concrete properties as well as it can be mixed, placed easier without compaction.

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Suparlan, Nur Aiman, Muhammad Azrul Ku Ayob, Hazrina Ahmad, Siti Hawa Hamzah, and Mohd Hisbany Mohd Hashim. "Preliminary Investigation on the Flexural Behaviour of Steel Fibre Reinforced Self-Compacting Concrete Ribbed Slab." Scientific Research Journal 15, no. 1 (June 1, 2018): 31. http://dx.doi.org/10.24191/srj.v15i1.9354.

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A ribbed slab structure has the advantage in the reduction of concrete volume in between the ribs resulting in a lower structural self-weight. In order to overcome the drawbacks in the construction process, the application of steel fibre self-compacting concrete (SCFRC) is seen as an alternative material to be used in the slab. This preliminary investigation was carried out to investigate the flexural behaviour of steel fibre self-compacting concrete (SCFRC) as the main material in ribbed slab omitting the conventional reinforcements. Two samples of ribbed slab were prepared for this preliminary study; 2-ribbed and 3-ribbed in 1 m width to identify the effect of the geometry to the slab’s flexural behaviour. The dimension of both samples is 2.5 m x 1 m with 150 mm thickness. The compressive strength of the mix is 48.6 MPa based on the cubes tested at 28 days. Load was applied to failure by using the four point bending test set-up with simple support condition. The result of the experiment recorded ultimate load carrying capacity at 30.68 kN for the 2-ribbed slab and 25.52 kN for 3-ribbed slab. From the results, the ultimate load of the 2-ribbed sample exceeds 3-ribbed by approximately 20%. This proved that even with lower concrete volume, the sample can still withstand an almost similar ultimate load. Cracks was also observed and recorded with the maximum crack width of 2 mm. It can be concluded that the steel fibres do have the potential to withstand flexural loadings. Steel fibre reduces macro-crack forming into micro-cracks and improves concrete ductility, as well as improvement in deflection. This shows that steel fibre reinforced self-compacting concrete is practical as it offers good concrete properties as well as it can be mixed, placed easier without compaction.

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Suparlan, Nur Aiman, Muhammad Azrul Ku Ayob, Hazrina Ahmad, Siti Hawa Hamzah, and Mohd Hisbany Mohd Hashim. "Preliminary investigation on the flexural behaviour of steel fibre reinforced self-compacting concrete ribbed slab." Scientific Research Journal 15, no. 1 (June 1, 2018): 32–45. http://dx.doi.org/10.24191/srj2018.15.1.32-45.

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A ribbed slab structure has the advantage in the reduction of concrete volume in between the ribs resulting in a lower structural self-weight. In order to overcome the drawbacks in the construction process, the application of steel fibre self-compacting concrete (SCFRC) is seen as an alternative material to be used in the slab. This preliminary investigation was carried out to investigate the flexural behaviour of steel fibre selfcompacting concrete (SCFRC) as the main material in ribbed slab omitting the conventional reinforcements. Two samples of ribbed slab were prepared for this preliminary study; 2-ribbed and 3-ribbed in 1 m width to identify the effect of the geometry to the slab’s flexural behaviour. The dimension of both samples is 2.5 m x 1 m with 150 mm thickness. The compressive strength of the mix is 48.6 MPa based on the cubes tested at 28 days. Load was applied to failure by using the four point bending test set-up with simple support condition. The result of the experiment recorded ultimate load carrying capacity at 30.68 kN for the 2-ribbed slab and 25.52 kN for 3 ribbed slab. From the results, the ultimate load of the 2-ribbed sample exceeds 3-ribbed by approximately 20%. This proved that even with lower concrete volume, the sample can still withstand an almost similar ultimate load. Cracks was also observed and recorded with the maximum crack width of 2 mm. It can be concluded that the steel fibres do have the potential to withstand flexural loadings. Steel fibre reduces macro crack forming into micro-cracks and improves concrete ductility, as well as improvement in deflection. This shows that steel fibre reinforced self-compacting concrete is practical as it offers good concrete properties as well as it can be mixed, placed easier without compaction.

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Soghair, H. M., A. G. Aly, M. H. Ahmed, and M. A. Farouk. "STRUCTURAL ANALYSIS OF RIBBED SLAB." JES. Journal of Engineering Sciences 36, no. 3 (May 1, 2008): 615–38. http://dx.doi.org/10.21608/jesaun.2008.116154.

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Fodzi, Nurulain Hanida Mohamad, and M. H. Mohd Hisbany. "Structural Effect of Using Steel Fiber Reinforcement on the Punching Shear of Self-Compacting Fiber Reinforced Concrete (SCFRC) Ribbed Slabs." Materials Science Forum 972 (October 2019): 99–104. http://dx.doi.org/10.4028/www.scientific.net/msf.972.99.

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—Ribbed slab is an ideal structure for architects and contractors. It has an attractive soffit appearance and also giving economical value when it is come in weight and material saving. Placing and finishing of concrete slab normally influence about 30% - 35% of overall cost of flooring system. Ribbed slab or also known as one-way joist slab system consist of regularly spaced concrete joist or ribs spanning in one direction, a reinforced concrete slab cast integrally with the ribs and beam span between the columns, perpendicular to the ribs. However the complexity of the structure itself has become an issue due to honeycomb and poor workmanship. To overcome this problem, the use of Self-Compacting Steel Fiber Reinforcement Concrete (SCFRC) could improve the workmanship quality and to minimize the occurrence of honeycomb in concrete. Steel fiber in concrete improved the resistance of reinforced structural members cracking, deflection and other serviceability condition. Thus, this alternative approach will be the main focus in this study.Punching shear strength in reinforced concrete slabs subjected to concentrated loads has received a lot of emphasis due to its importance in the structural system, this failure may take place due to in conservative design of slab overloading and deterioration of strength in concrete and reinforcement. The continuous improvement of the technology of SCFRC and the better knowledge on the mechanical behavior of this SCFRC ribbed slab are contributing to a larger field application of SCFRC. Determination of punching shear strength has received considerable attention by the engineering profession in recent years.

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Li, B., Y. Q. Lin, H. L. Zhang, and M. J. Ma. "Fire Behavior of the Assembled Monolithic Hollow-Ribbed Slabs." Advances in Civil Engineering 2019 (October 9, 2019): 1–10. http://dx.doi.org/10.1155/2019/8921502.

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This paper presents the results from the furnace tests conducted on two assembled monolithic hollow-ribbed (AMH) slabs consisting of the open box and the covered box, respectively. Detailed experimental data in the form of describing slab cracking or spalling, furnace temperatures, temperature distributions, and vertical deflections are presented. Comparison of the results from the two fire tests indicates that the covered box shows better fire resistance compared to the open box; thus, the covered box is recommended to adopt in structural fire-resistant design. However, they are both prone to cracking or spalling at their bottom surfaces during the fire tests, so the AMH slab still needs further optimum design to meet its requirements of fire resistance and service function. In addition, the sealing quality of congruent boxes also has a great influence on the fire resistance of the AMH slab.

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Elkelish, S., and Hugh Robinson. "Effective widths of composite beams with ribbed metal deck." Canadian Journal of Civil Engineering 13, no. 5 (October 1, 1986): 575–82. http://dx.doi.org/10.1139/l86-084.

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The effective width of the concrete slab of a composite beam is used in the determination of its moment resistance and service load moment for the purposes of structural design of the composite beam. It is usually assumed that the same effective width of the concrete slab may be used for both ultimate strength and elastic stage calculations.This paper presents the results of an analytical investigation of the variation of the effective width of composite beams and ribbed slabs formed by ribbed metal deck in both the elastic and inelastic stages and at ultimate load. A layered finite element method is used to model the composite beam. The influence of four variables on the effective width of the composite beams was studied, namely, type of loading, beam span to actual concrete slab width, ultimate compressive strength of the concrete, and steel beam size.It was found that the effect of the compressive strength of the concrete and the size of the steel beam have negligible influence on the effective width of the concrete slab. The effective width of the slab at ultimate load is of the order of 4% larger than that in the elastic range.The effective width used for the design of composite beams under a uniformly distributed load, which is the practical loading in most cases, is significantly different from that which should be used for any other type of loading.

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Samsudin, Amir Syafiq, Mohd Hisbany Mohd Hashim, Siti Hawa Hamzah, and Afidah Abu Bakar. "Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel." Scientific Research Journal 15, no. 1 (June 1, 2018): 17–29. http://dx.doi.org/10.24191/srj2018.15.1.17-29.

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Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction ofribbed slab reduces concrete materials and thusthe cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2. The slab wastested underthree-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. Thisresearch showsthat SFRCRibbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

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Vasilchenko, Alexey, Olexandr Danilin, Tatiana Lutsenko, and Artem Ruban. "Features of Evaluation of Fire Resistance of Reinforced Concrete Ribbed Slab under Combined Effect "Explosion-Fire"." Materials Science Forum 1038 (July 13, 2021): 492–99. http://dx.doi.org/10.4028/www.scientific.net/msf.1038.492.

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Calculations using the example of a reinforced concrete ribbed slab have shown that if, as a result of an explosion, due to cracks that have arisen, a part of the compressed concrete layer is turned off, then even while maintaining the bearing capacity of the slab, its fire resistance is significantly reduced. It is shown that on the basis of the proposed methodology for studying the behavior of bending elements under the combined effect of "explosion-fire", it is possible to take into account the necessary parameters of reinforced concrete ribbed slabs in the design and operation of structures of hazardous operations industrial facilities. Also, the proposed technique makes it possible to predict a relatively safe amount of explosive in the technological process of an hazardous operations industrial facility, without leading to catastrophic consequences.

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Huang, Wei, Xiang Ma, Bin Luo, Zeliang Li, and Yujiao Sun. "Experimental Study on Flexural Behaviour of Lightweight Multi-Ribbed Composite Slabs." Advances in Civil Engineering 2019 (October 13, 2019): 1–11. http://dx.doi.org/10.1155/2019/1093074.

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To develop new slabs with light weight and high rigidity as well as meet the requirements of use and facilitate construction, a large-span multi-ribbed composite slab (R-CS) with filled lightweight blocks is proposed based on systematic research. Static tests of the bending behaviour of the four pieces of the R-CS specimens and one ordinary concrete cast-in-place slab were carried out. The fracture distribution, bearing capacity, deflection, and load-strain curves of the tensile steel bars were analysed. The difference in the bending behaviour between the R-CS specimens and the cast-in-place slab and the influence of different structural forms on the bending behaviour of the R-CS samples were studied. By calculating the bearing capacity of the fully composite state, their composite performance was evaluated. The research shows that the bending failure process of the R-CS specimens is similar to that of the cast-in-place slab and the crack and deflection development as well as ductility are relatively good. The measured bearing capacity of the specimen can reach more than 70% of the theoretical calculation strength under the fully composite state. The composite performance is satisfactory.

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Qian, Kun, Tian Xia, Jie Zhang, and Quan Yuan. "Study on the Effect of Blocks on Seismic Performance of Improved Multi-Ribbed Slab Structure." Applied Mechanics and Materials 438-439 (October 2013): 1592–96. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1592.

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In order to confirm the calculation model of multi-ribbed slab structure and transmission of earthquake action, this paper improved existing multi-ribbed slab structure. The calculation model of improved multi-ribbed slab structure confirmed the stress relationship among three seismic fortification lines, and the transmission of earthquake action became clear, the same calculation model could be applied in structural analysis. For studying the features of characteristic parameters of restoring force changing in the first seismic fortification line, blocks, and correcting the parameters, the experimental study was carried out. The experiment shows that when a unidirectional horizontal load was applied, that blocks in grid frame could be regarded as a slanted strut that with specific section and elasticity, the ideal slanted struts nominal elastic modulus is roughly in 20~60 N/mm2.

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A. Abdulkareem, Taif, and Ashraf A. Alfeehan. "Effect of the Rib Depth to the Overall Beam Depth Ratio in the Lightweight One-Way Ribbed Slabs." International Journal of Engineering & Technology 7, no. 4.20 (November 28, 2018): 438. http://dx.doi.org/10.14419/ijet.v7i4.20.26239.

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The ribbed slabs provide a lighter and stiffer slab than an equivalent traditional slab with minimizing the total volume of the materials. Four one-way lightweight concrete panels, including one flat and three ribbed panels were cast and tested under two-point load as simply supported up to the failure. The main investigated variable is a ratio of the rib depth (d) to the overall beam depth (h). All the panels have the same concrete volume and the same steel reinforcement ratio. Also, the width of the rib is equal to the slab thickness as a constraint condition in all the panels. Data were recorded at the loading stages to determine the load capacity and the deflection. A nonlinear finite element analysis carried out by using ANSYS-15 software program to analyze the panels and to verify the results. Increase the (d/h) ratio improved the structural behavior by increase the carrying load capacity and reduces the deflection to a certain limit. Compatibility results have been obtained between the numerical and experimental work.

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Keleş, Yılmaz, Hüseyin Kasap, and Zeynep Yaman. "Evaluating the effects of different slab types on static and dynamic characteristics of structures." Challenge Journal of Structural Mechanics 7, no. 2 (June 23, 2021): 71. http://dx.doi.org/10.20528/cjsmec.2021.02.003.

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In this study, the effect of different types of slabs on dynamic characteristics of structures under the lateral loading was investigated. For this purpose, four different types of slabs namely, beamed slab, flat slab, one way ribbed (hollow core) slab and waffle slab have been modeled in buildings having 3, 4 and 5 storeys with the same geometric dimensions, in accordance to design and construction requirements (TS 500) and Turkish building seismic codes (TBDY, 2018). Seismic analysis calculations of the modeled buildings were done using the equivalent seismic load method. The assumed local soil class was taken from the geotechnical report as ZD. As a result of the analysis, natural periods, base shear forces, maximum horizontal displacements and relative storey drifts of the buildings were compared. Seismic analysis and calculations of the buildings were completed using SAP2000 finite element software.

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Yuan, Quan, Yuan Yuan Zhao, and Hai Tao Liu. "Research on the Formula of Vibration Period of Multi-Ribbed Composite Slab Structure." Advanced Materials Research 217-218 (March 2011): 712–16. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.712.

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As a new structural system with a bright prospect, multi-ribbed composite slab structure has the advantages of ecological materials and seismic performance. In this paper, the formula of vibration period of multi-ribbed composite slab structure is discussed. Based on the analysis of FEM model and the regression analysis of experimental data, an empirical formula was put forward. It has been shown that the calculated results fit well with the test results.

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Elkelish, M. S., and Hugh Robinson. "Longitudinal cracking of composite beams with ribbed metal deck." Canadian Journal of Civil Engineering 13, no. 6 (December 1, 1986): 733–40. http://dx.doi.org/10.1139/l86-108.

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An analytical study of the longitudinal cracking of composite beams with ribbed concrete slab on metal deck is presented. A layered finite element is used to model the composite beam in the analysis. The influence of six parameters on the development of the longitudinal crack is investigated in this study. These parameters are type of loading, compressive strength of the concrete slab, beam span to slab width ratio, thickness of the solid part of the slab, percentage of transverse reinforcement, and the existence of the metal deck. Three types of loading are considered, namely, uniformly distributed load over the entire slab area, single point load applied at mid-span of the beam, and two point loads applied at the third points of the span. The type of loading of composite beams has a significant effect on the location of the initial longitudinal crack.

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Zhang, Qi, Qian Feng Yao, Yin Zhang, Wei Huang, and Dong Bo Li. "Research on the Calculation Method of Vertical Seismic Capacity of the Multi-Ribbed Composite Slab." Advanced Materials Research 152-153 (October 2010): 1873–77. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.1873.

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On the basis of experimental study on 5 standard slabs’ vertical bearing capacity, the paper makes an in-depth analysis on the ratio of axial compression stress to strength, the ratio of height to thickness and the influence of embedded block on the axial bearing capacity of the slabs. By establishing finite element model of the slab, the paper analysis the influence factors by means of numerical simulation and establishing the theoretical calculation formula of the slab. Compared with the experimental results, it is showed that the accuracy of the theoretical calculation formula can meet the practical requirements, which provides theoretical calculation basis for engineering practice.

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Xu, Xiaoqing, and Zhujian Hou. "Experimental Study on One-Way BFRP Bar-Reinforced UHPC Slabs under Concentrated Load." Materials 13, no. 14 (July 10, 2020): 3077. http://dx.doi.org/10.3390/ma13143077.

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The application of fiber-reinforced polymer (FRP) bars and ultra-high performance concrete (UHPC) in the field of civil engineering is promising. An innovative FRP bar-reinforced UHPC short-ribbed bridge deck slab, with low self-weight and high structural performance, was proposed in this study. The behavior of one-way basalt FRP (BFRP) bar-reinforced UHPC slabs under concentrated load was experimentally investigated, and compared with that of a steel bar-reinforced UHPC slab. The ultimate capacity of the one-way BFRP bar-reinforced UHPC slab was 0.59 times that of the steel bar-reinforced UHPC slab, while its ductility was better. Increasing the reinforcement ratio and loading area was beneficial to the ductility of one-way BFRP bar-reinforced UHPC slabs. Moreover, the model proposed by EI-Gamal et al. was found to be suitable for evaluating the punching shear capacities of one-way BFRP bar-reinforced UHPC slabs. However, the model failed to consider the unique strain-hardening characteristics of UHPC, which led to conservative prediction.

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Zhang, Qi, Qian Feng Yao, Yin Zhang, Wei Huang, and Qi Xiang Yin. "Research on Optimization Design of the Lateral Stiffness Satio about the Frame-Supported Multi-Ribbed Structure." Advanced Materials Research 152-153 (October 2010): 954–58. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.954.

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By testing 4 pin standard frame-supported multi-ribbed composite slab’s mechanical proper- ties under the horizontal load’s funtion,it is got that the earthquake resistance performance influence of lateral stiffness satio to frame-supported multi- ribbed slabs.The reasonable value scope of stiffness satio between transformation layers is obtained by finite element analysis of seismic response of frame-support- ed multi-ribbed slab structures and provides theoretical basis to engineering design

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Qian, Kun, Gui Yan Dong, Jie Zhang, and Quan Yuan. "Study on the Effect of Grid Beam on Seismic Performance of Improved Multi-Ribbed Slab Structure." Advanced Materials Research 724-725 (August 2013): 1754–58. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.1754.

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In order to confirm the calculation model of multi-ribbed slab structure and transmission of earthquake action, this paper improved the existing multi-ribbed slab structure. The calculation model of improved multi-ribbed slab structure confirmed the stress relationship among three seismic fortification lines, and the transmission of earthquake action became clear, this calculation model could be applied in structural analysis. For studying the effect of characteristic parameters of restoring force changing in the second seismic fortification line on seismic performance, and correcting the parameters of grid beam, this paper analyzed push-over model of the second seismic fortification line to get the static pushover curve. According to the study, the amount of steel bar in grid beam and sectional dimension of grid beam made the major effect on characteristic parameters of restoring force in the second seismic fortification line, concrete grade of grid beam is a unconsidered factor. Nominal elastic modulus of filling materials didnt much affect the yield strength and yield displacement of the second seismic fortification line, but made significant effect on post-yield strength.

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Yang, Weijun, Yongda Yang, Jihua Yin, and Yushuang Ni. "Experimental Study on Mechanical Property of Stiffening-ribbed-hollowpipe Reinforced Concrete Girderless Floor with Four Clamped Edges Supported." Open Civil Engineering Journal 7, no. 1 (October 31, 2013): 170–78. http://dx.doi.org/10.2174/1874149501307010170.

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In order to study the basic mechanical property of cast-in-place stiffening-ribbed-hollow-pipe reinforced concrete girderless floor, and similarities and differences of the structural performance compared with traditional floor, we carried out the destructive stage loading test on the short-term load test of floor model with four clamped edges supported in large scale, and conducted the long-term static load test. Also, the thesis conducted finite element analysis in virtue of ANSYS software for solid slab floor, stiffening-ribbed-hollow-pipe floor and tubular floor. The experiment indicates that the developing process of cracks, distribution and failure mode in stiffening-ribbed-hollow-pipe floor are similar to that of solid girderless floor, and that this kind of floor has higher bearing capacity and better plastic deformation capacity. The finite element analysis manifests that, compared with solid slab floor, the deadweight of stiffening-ribbed-hollow-pipe floor decreases on greater level while deformation increases little, and that compared with tubular floor, this floor has higher rigidity. So stiffening-ribbed-hollow-pipe reinforced concrete girderless floor is particularly suitable for long-span and large-bay building structure.

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Hou, Xian Qin. "Calculation and Analysis of Composite Wall Frame by Finite Element." Applied Mechanics and Materials 578-579 (July 2014): 460–63. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.460.

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The lightweight frame structure with Multi-ribbed slab is a new energy-efficient residential architecture. The Multi-ribbed composite wall of the frame structure plays an important role as the main bearing components. This paper mainly discussed the mechanical performance of composite wall. A simplified frame-plane model was built based on the theoretical analysis of the composite wall. The professional calculating program has been designed and written by FORTRAN, and the calculation and analysis of the typical model has been completed with the program. Finally, the frame-plane simplified model was further calculated and analyzed by ANSYS. The method used in this paper may open a new approach for simulating and analyzing the mechanical performance in engineering practice and the result we got may provide some theory basis for the application of Multi-ribbed slab frame structure.

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Liu, Jiepeng, Shu Huang, Jiang Li, and Y. Frank Chen. "Vibration Behavior of Composite Slab with Precast Ribbed Panels due to Transient Impact." International Journal of Structural Stability and Dynamics 19, no. 12 (December 2019): 1950148. http://dx.doi.org/10.1142/s0219455419501487.

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Excessive floor vibrations due to human activities such as heel-drop and jumping can induce annoyance to occupants and cause a serious serviceability problem. Both field tests and finite element analysis were conducted to study the vibration behavior of the composite slab with precast ribbed panels (CSPRP), a relatively new floor system compared with the cast-in-place reinforced concrete (RC) slab. In addition, both heel-drop and jumping impacts were employed to generate the acceleration response of the floor, from which two important vibration characteristics of natural frequencies and damping ratios are obtained. A comparison of the vibration behavior of CSPRPs with RC slabs indicates that the former exhibits more satisfactory perceptibility in terms of vibration. Appropriate coefficients (i.e. [Formula: see text] and [Formula: see text]) with the root-mean-square and peak accelerations subjected to heel-drop and jumping excitations are proposed for both CSPRPs and RC slabs. Lastly, an extensive parametric study considering different boundary conditions, floor types, and floor spans was carried out using the finite element method. It is recommended to use CSPRP under 3.3[Formula: see text]m span in order to keep the fundamental frequency above 3.0[Formula: see text]Hz.

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Lau, T. L., and L. A. Clark. "Shear transfer between ribbed slab and internal column." Magazine of Concrete Research 59, no. 7 (September 2007): 507–16. http://dx.doi.org/10.1680/macr.2007.59.7.507.

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Lau, T. L., and L. A. Clark. "Shear transfer between ribbed slab and edge column." Magazine of Concrete Research 60, no. 6 (August 2008): 411–19. http://dx.doi.org/10.1680/macr.2008.60.6.411.

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Qian, Kun, Miao Wang, Jie Zhang, and Quan Yuan. "Study on the Effect of Grid Column on Seismic Performance of Improved Multi-Ribbed Slab Structure." Applied Mechanics and Materials 351-352 (August 2013): 910–14. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.910.

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In order to confirm the calculation model of multi-ribbed slab structure and transmission of earthquake action, this paper improved existing multi-ribbed slab structure. The calculation model of improved multi-ribbed slab structure confirmed the stress relationship among three seismic fortification lines, and the transmission of earthquake action became clear, the same calculation model could be applied in structural analysis. For studying the effect of characteristic parameters of restoring force changing in the second seismic fortification line on seismic performance, and correcting the parameters, this paper analyze push-over model of the second seismic fortification line to get the static pushover curve. According to the study, the amount of steel bar in grid column and sectional dimensions of grid beam made the major effect on characteristic parameters of restoring force in the second seismic fortification line. The growth of steel bar’s sectional area in grid framework and the yield strength are mainly in direct proportion. It is more reasonable that simultaneously alter steel bar’s sectional area in grid frame and dimensions of grid framework to adjust characteristic parameters of restoring force changing in the second seismic fortification line.

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Li, Ming, Zhe Zhe Sun, Wei Jian Zhao, and Yong Liu. "Research Progress on Reinforced Concrete Laminated Slab in China." Applied Mechanics and Materials 174-177 (May 2012): 263–67. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.263.

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The development of new generation prefabricated reinforced concrete structure is still at an early stage in China. Reinforced concrete laminated slab, as an important horizontal load carrying member, is paid much attention to in research. Based on the research results about it in China, the progress of which is summarized, including the form, characteristics and experimental research of sandwich laminated slab, anti-ribbed laminated slab, and hollow laminated slab etc. Finally, the further research is prospected.

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Wang, Yabo, H. T. Liu, G. F. Dou, C. H. Xi, and L. Qian. "Experimental Study of Multi-Ribbed One-Way Composite Slabs Made of Steel Fibre, Foam, and Normal Concrete." Archives of Civil Engineering 64, no. 2 (December 31, 2018): 79–96. http://dx.doi.org/10.2478/ace-2018-0018.

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Abstract This paper aims to study the effect of reinforcement configuration (steel fibre and rebar) on the mechanical performance of composite slabs of the same total steel contents. We manufactured four pieces of fullscale multi-ribbed composite prefabricated slabs with different reinforcement configurations by using steel fibrereinforced concrete, foam concrete, and normal concrete. The multi-ribbed composite prefabricated slab has many excellent properties, such as light weight, good thermal and sound insulation. Thus, it can be applied to fabricated structures. In addition, the composite prefabricated slabs with the same total steel contents but with different reinforcement configurations were studied under the same static load, and many technical indicators such as crack resistance capacity, yield load, ultimate load capacity, maximum deflection, destructive pattern, and stress of steel rebar were obtained. Results indicate reinforcement configuration has a significant effect on the mechanical performance of composite prefabricated slabs with the same total steel contents, and composite prefabricated slabs reinforced with longitudinal rebar and steel fibre (volume fraction is 1.5%) have the best mechanical performance and ductility.

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Zhou, Shuang Xi. "Preparation and Application of a Self-Thermal and Insulation-Ribbed Floor." Applied Mechanics and Materials 353-356 (August 2013): 2896–99. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2896.

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With the cementitious composite formwork without being removed, steel wire frame and formwork technology, a self-thermal and insulation-ribbed concrete floor is made. Through the tests of bend-bearing capacity of self-thermal and insulation-ribbed floor, the results show that the loads of the self-thermal and insulation-ribbed floor meet the limits on deflection requirements according to the design of concrete structures. Besides, the floor has a better thermal and soundproof function compare to the ordinary concrete beam and slab, and its comprehensive cost of construction is low.

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Jia, Ying Jie, Quan Yuan, and Qian Feng Yao. "Research on Shear Resistant Capacity and Reliability of Multi-Ribbed Composite Wall in High-Rise Building." Key Engineering Materials 302-303 (January 2006): 669–75. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.669.

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As a new structural system, MRSS (multi-ribbed slab structure) has some applications in multistory building. But theoretical investigation and application study on multi-ribbed composite wall in high-rise building should be developed with various factors composing shear resistant capacity of wall under complicated loads. By means of model test and numerical simulation with FEM (finite element method), shear resistant expression of slab in tall building is set up and reliability index of a representative wall under small earthquake is figured out. Sensitivity of each factor affecting shear strength is evaluated. These works disclose the wall’s load bearing mechanism and make the structure application more feasible and assure the new system safety in practice.

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Vasilyev, A. S., Olga Odinokova, and Veronika P. Nazarova. "Investigation of the Effect of Reinforcing Diaphragms Ribbed Panels on their Carrying Capacity." Materials Science Forum 974 (December 2019): 577–82. http://dx.doi.org/10.4028/www.scientific.net/msf.974.577.

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It has been established that structural analysis of ribbed panels on the carrying capacity of standard cross-sections is presented as reinforced concrete T-shaped or I-beams. However, this approach does not allow factoring in the effect of transversal ribs (diaphragms) on the accounting result for two groups of limit states. As a rule, transversal ribs are used in slabs with a greater width and serve mainly to provide its bending strength across the width mode transversely. It should be mentioned that a slab is calculated according to the beam theory based on structural mechanics models that characterize its behavior approximately in either direction along standard cross-sections. The theory of plate and shell can define the behavior under steady load of such a slab more precisely. However, applying this theory is attended with certain difficulties because of steel collaboration in multiple directions, as well as having material nonlinearity in the model. The work investigates ribbed floor panels which are modeled using modern software. The authors studied samples with prestressed and nonprestressed reinforcing as well as with or without transversal ribs. Finally, the authors find out that it is worth considering transversal ribs with regard to their reinforcement in stress calculations for standard cross-sections along a slab length. It can contribute to the development of correcting coefficients and specification of the section of the calculating theory of building constructions. The authors obtained innovative outcomes.

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Fahmy, E. H., and Hugh Robinson. "Analyses and tests to determine the effective widths of composite beams in unbraced multistorey frames." Canadian Journal of Civil Engineering 13, no. 1 (February 1, 1986): 66–75. http://dx.doi.org/10.1139/l86-010.

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This paper concerns the analysis and testing of 10 cantilever composite beams incorporating ribbed metal deck, representing the positive moment beam–column connections in an unbraced steel frame with composite floor beams. The positive moment beam–column connections arise from lateral forces on the unbraced frame. The effective widths of the slabs for strength and stiffness calculations have been determined from analysis. Agreement between the calculated strain distributions across the concrete slab width and the corresponding measured strain distributions was attained. Use of the calculated effective widths of the slab for strength together with a concrete strength of [Formula: see text] gave good agreement with the measured positive ultimate moment capacities of the cantilever composite beams subjected to upward end test loads.

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Yuan, Quan, Qian Feng Yao, and Ying Jie Jia. "Study on Hysteretic Model and Damage Model of Multi-Ribbed Composite Wall." Key Engineering Materials 302-303 (January 2006): 644–50. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.644.

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The use of composite materials in structural engineering is recent, and researchers need to investigate their behavior features. A new unit of multi-ribbed composite wall is introduced. A multi-ribbed composite wall is the main bearing-load member in multi-ribbed slab structures (MRSS). The bearing-load characteristics and seismic properties of the wall are different from those of other ordinary concrete members In order to study seismic behavior and durability of Multi-ribbed composite walls, experiments of 26 pieces of composite walls under cyclic loading were carried out, and then the hysteretic model of shear force–shear deformation is established. The hysteretic curves of typical composite walls are calculated. The calculated curves agree well with the experimental ones. The damage model is quantified. This study introduces a quantitative analysis means for evaluating seismic behavior aspects of damage and durability of multi-ribbed composite walls.

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Qian, Kun, Tian Xia, Jie Zhang, and Quan Yuan. "Study on the Effect of Outer Frame on Seismic Performance of Improved Multi-Ribbed Slab Structure." Advanced Materials Research 791-793 (September 2013): 330–34. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.330.

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This paper confirmed the calculation model of improved multi-ribbed slab structure and the stress relationship among three seismic fortification lines, offered the possibility of distributing earthquake action reasonably, provided the basis for optimal design. Comparing the similarities and differences between the improved multi-ribbed slab structure and energy-consumption braced frame; characteristic parameters of restoring force in the third seismic fortification line, outer frame, would be got by design and be adjusted. This paper analyzed the third seismic fortification line by numerical simulation and example analysis, the variation range of performance of the third seismic fortification line is got, this range can be adjusted by changing the influencing factors of three seismic fortification lines. The reasonable destruction mode of three seismic fortification lines could be achieved, namely the control design of three seismic fortification lines could be achieved.

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Kelpša, Šarūnas, Gediminas Rinkevičius, Tadas Zingaila, Mindaugas Augonis, and Vadimas Kitovas. "Coefficient of Moment of Inertia for Ribbed RC Slab Beams." Mechanics 25, no. 3 (July 1, 2019): 178–86. http://dx.doi.org/10.5755/j01.mech.25.3.22691.

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During the design process of monolithic ribbed slabs, engineers face a common issue how to correctly evaluate stiffness of the beams. When Bar and Plate elements are used for analysis of the slabs, the neutral axis of those members are in the same level, therefore the stiffness of (T) shape cross-section is not considered correctly in the calculations. In this case the internal forces are obtained incorrectly as well as deflections of the beams are overestimated. A simple method is discussed in this paper, which allows engineers to calculate internal forces and deformations of mentioned type slabs more accurately with FEM programs by using Bar and Plate elements. The method is based on Bar elements moment of inertia adjustment. After the comparative analysis of differences between moment of inertia of (T) and (+) shape cross-sections as well as deflection discrepancies, the adjustment coefficient expression is presented. In order to reflect the actual behaviour of ribbed slabs even more accurately the influence of shear deformations is also considered. In this case not only the member geometry but the material properties, loading scheme and even supports are taken into account in the calculations of the adjustment coefficient. Selection of the most appropriate (effective) flange width of (T) shape cross-section is also analysed in this paper. Comparative calculations were done using different effective flange widths beff calculated by EC2 (Eurocode 2), “STR” (Lithuanian Construction Technical Regulations) and ACI (American Concrete Institute) methods. In order to assess the reliability of the proposed calculation method and the calculation results all plates were also analysed using Solid elements. Application of the presented expressions of moment of inertia coefficient will allow engineers to evaluate stiffness of (Γ) and (T) shape cross section beams simply, fast and accurately enough for most of structural engineering calculations.

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Park, J. W., C. H. Kim, and S. C. Yang. "Ultimate Strength of Ribbed Slab Composite Beams with Web Openings." Journal of Structural Engineering 129, no. 6 (June 2003): 810–17. http://dx.doi.org/10.1061/(asce)0733-9445(2003)129:6(810).

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Qian, Kun, Tian Xia, Jie Zhang, and Quan Yuan. "The Application of Straw Concrete Wall Board in Constructional Engineering." Applied Mechanics and Materials 438-439 (October 2013): 1607–11. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1607.

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Constructional engineering was always faced with the threaten of earthquake and the problem of large energy consumption. As a new type of green building material, straw concrete has better ductility than normal concrete. In the straw concrete multi-ribbed slab structure, as the filling material of wall board, straw concrete improved the energy dissipation and deformability of wall board. When the load was applied, the filling blocks, grid frame and outer frame in straw concrete wall board work cooperatively, have good mechanical properties. The straw concrete wall board has advantages that light, high strength, energy conservation and seismic resistance. Considering the effect of different components in straw concrete wall board, this paper proposes the formula of vertical bearing capacity of straw concrete wall board to provide the basis for engineering application. The construction of straw concrete multi-ribbed slab structure include three processes that steel bar bind, blocks prefabrication and integral pouring, which fits for field fabrication in the building construction site.

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Zheng, Xian Chun, Zhi Qiang Li, and Si Zhong Sun. "Application of Formwork Technology in Engineering." Applied Mechanics and Materials 170-173 (May 2012): 3141–44. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3141.

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Installing and dismantling the formwork are not easy in cast-in-situ multi-ribbed slab construction,the formwork technology overcomes the difficult problem.This paper mainly introduces the construction technology and quality standards of the plastic formwork.Through the engineering practice,the author sums up the advantages of this technology.

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Chang Peng, and Li Qiangjun. "Pseudo-Dynamic Tests and Numerical Analysis of Multi-Ribbed Slab Structure." International Journal of Digital Content Technology and its Applications 7, no. 1 (January 15, 2013): 395–403. http://dx.doi.org/10.4156/jdcta.vol7.issue1.46.

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Journal articles on the topic 'Ribbed slab'

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