Numerical investigation on load redistribution capacity of flat slab substructures to resist progressive collapse

Weng, Yun-Hao; Qian, Kai; Fu, Feng; Fang, Qin

doi:10.1016/j.jobe.2019.101109

Cited by 68 publications

(27 citation statements)

References 22 publications

(53 reference statements)

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“…Similar to test set up in [ 21 , 22 , 23 , 24 , 25 ], as it shown in Figure 3 a,b, strain gauges are symmetrically arranged at 200 mm intervals on the CFRP bars and five strain gauges (BA120-05AA) are pasted at equal intervals on the front and back surface of concrete in the middle of the span. All strain gauges are connected to a strain tester (DONGHUA DH3816N, Jingjiang, Jiangsu, China) for measurement.…”

Section: Test Programmentioning

confidence: 99%

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

et al. 2021

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FRP (Fiber Reinforced Polymer) Bar reinforced coral concrete beam is a new type of structural member that has been used more and more widely in marine engineering in recent years. In order to study and predict the flexural performance of CFRP reinforced coral concrete beams, the flexural rigidity, crack morphology and failure mode of concrete were studied in detail. The results show that under the condition of similar reinforcement ratio, the flexural rigidity of CFRP reinforced coral concrete beam is significantly lower than that of ordinary reinforced concrete beam. Increasing the cross-section reinforcement ratio within a certain range can increase the bending stiffness of the test beam or reduce the deflection, but the strength utilization rate of CFRP reinforcement is greatly reduced. The short-term bending stiffness of the CFRP reinforced coral concrete beam calculated by the existing standard formula is obviously higher. This paper proposes a modified formula for introducing the strain inhomogeneity coefficient (ψ) of CFRP bars and considers the relative slip between CFRP bars and coral concrete to predict the short-term flexural stiffness of coral concrete beams reinforced by CFRP bars. The formula was verified with the test results, and it was proved that the formula has a good consistency with the test results.

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Section: Test Programmentioning

confidence: 99%

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

et al. 2021

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“…The failure modes of beams are key in resisting global collapse of a building 35,36,37 . Each specimen are shown in Figure 9 and Table 4.…”

Section: Test Results Analysismentioning

confidence: 99%

Flexural capacity of steel‐FCB bar‐reinforced coral concrete beams

Wang

Song

Huang

et al. 2020

Structural Concrete

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Steel‐fiber composite bar (SFCB) is a new technique with steel core embedded into the fiber‐reinforced polymer (FRP) bars, which solve the shortcomings of poor ductility and low stiffness of FRP‐reinforced concrete members. Based on the experimental study, flexural behavior of a new type concrete, SFCB bars‐reinforced coral concrete beams, is investigated. The deflection, failure mode, tensile strain, and ultimate flexural capacity of this new type of concrete beam are studied in detail through a series four‐points bending tests. The results show that the failure process of SFCB‐reinforced coral concrete beam can be divided into three main stages: elastic, cracking, and failure. Because exterior layer of SFCB bar is able to continue to withstand tensile stress after its steel core yield, hence, the flexural rigidity and flexural capacity of the beams both increase. The flexural stiffness of SFCB bars‐reinforced coral concrete beams is also increased, and the load‐deflection relation is more or less nonlinear. By using SFCB bars, the stiffness of the beams can be increased by about 20%. However, under high stress state, the relative slip between the carbon fiber and the concrete as well as that between the steel core and the carbon fiber cause tensile stress loss which weakened the flexural resistance of the SFCB bar‐reinforced coral concrete beam. The bonding performance between the round surface steel core and the carbon fiber is obviously weaker than that of the threaded surface steel core, and the steel core slip is more likely to occur under the higher tensile stress. When Using ACI440.1R‐15 and GB50608‐2010 to calculate the flexural capacity of the SFCB beams, the ratios of the theoretical value and the measured value from tests are 1.07 and 1.12, respectively. By introducing two new factors k1 and k2, a formula was developed through modification of the existing ones from ACI440.1R‐15 and GB50608‐2010 to calculate the ultimate flexural capacity of SFCB bar reinforced concrete beam which agrees as high as 93–99% with the experimental results.

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“…In this paper, four-point bending tests were performed, similar test procedure and instrumentation of [39][40][41][42][43] were adopted. The suitability of using the formulas from existing codes were examined.…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Steel-FRP, FRP and Steel-Reinforced Coral Concrete Beams in Their Flexural Performance

Wang

Zhang

Huang³

et al. 2020

Materials

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In this study, a comparative study of carbon fiber reinforced polymer (CFRP) bar and steel–carbon fiber composite bar (SCFCB) reinforced coral concrete beams was made through a series of experimental tests and theoretical analyses. The flexural capacity, crack development and failure modes of CFRP and SCFCB-reinforced coral concrete were investigated in detail. They were also compared to ordinary steel-reinforced coral concrete beams. The results show that under the same conditions of reinforcement ratios, the SCFCB-reinforced beams exhibit better performance than CFRP-reinforced beams, and stiffness is slightly lower than that of steel-reinforced beams. Under the same load conditions, the crack width of SCFCB beams was between that of steel-reinforced beams and CFRP bar-reinforced beams. Before the steel core yields, the crack growth rate of SCFCB beam is similar to the steel-reinforced beams. SCFCB has a higher strength utilization rate—about 70–85% of its ultimate strength. Current design guidance was also examined based on the test results. It was found that the existing design specifications for FRP-reinforced normal concrete is not suitable for SCFCB-reinforced coral concrete structures.

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Numerical investigation on load redistribution capacity of flat slab substructures to resist progressive collapse

Cited by 68 publications

References 22 publications

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

Flexural capacity of steel‐FCB bar‐reinforced coral concrete beams

Comparative Study of Steel-FRP, FRP and Steel-Reinforced Coral Concrete Beams in Their Flexural Performance

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