Post-Fire Mechanical Performance Evaluation Method of Reinforced Concrete Slabs
Reinforced concrete(RC)slabs are among the most vulnerable structural components to damage in fires,necessitating the post-fire evaluation of their load-bearing capacity and subsequent re-inforcement.A finite element model for analyzing the post-fire mechanical performance of RC slabs was proposed.In this model,the variations in material constitutive relations during heating,cooling,and post-fire stages were considered.The impact of concrete protective layer spalling on temperature distribution and mechanical properties of the slabs under high temperatures was also taken into consid-eration.Building on this model,another finite element model for evaluating the load-bearing perfor-mance of RC slabs reinforced after fire exposure was also proposed.Both models employed element birth-death technology to simulate concrete spalling under high temperatures and post-fire reinforce-ment.The models could be used to evaluate the post-fire mechanical performance of reinforced RC slabs.The analysis revealed significant reductions in the post-fire load-bearing capacity of RC slabs,with noticeable residual deflection;however,reinforcement was able to substantially restore this capac-ity.
国家科技期刊平台
NSTL
万方数据
维普
