Abstract
AbstractIn order to study the progressive collapse resistance (PCR) performance of unequal-span reinforced concrete (RC) spatial beam-slab-column substructures, numerical analysis based on the experimental study of the PCR performance of RC structures under central column failure completed by Qian was carried out. A finite element (FE) model was established by the high precision FE software ANSYS/LS-DYNA, and the accuracy of the model was verified by comparing with experimental results. Based on the verified FE model, the extended parameters of the model were analyzed, including the effects of concrete strength, slab thickness and slab reinforcement ratio on collapse resistance of RC spatial beam-slab-column substructures and mechanism of load redistribution. The FE analysis results showed that the increase of concrete strength would increase the first peak load of the structure but weaken the deformation capacity of the member. Appropriately increasing the slab thickness can significantly improve the bearing capacity of the structure. And with the increase of the reinforcement ratio at the bottom of the slab, the resistance to catenary mechanism was improved obviously, but the deformation capacity of the structure was weakened. In the whole process of RC frame collapse, the contribution of the slab to resistance was about 46% on average according to load redistribution analysis.KeywordsRC beam-slab-column substructuresPushdown methodFEMProgressive collapse resistanceResistance mechanism
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