爆炸下钢柱破坏时间及残余承载力对钢框架连续倒塌的影响

建立钢框架连续倒塌单自由度(SDOF)分析模型，研究钢柱破坏时间及其残余承载力对钢框架连续倒塌的影响规律，发现钢柱破坏时间越长、残余承载力越大，结构位移响应越小.以SDOF模型响应的理论解为基础，得出在钢框架倒塌计算中是否考虑钢柱破坏时间的界限标准：当钢柱破坏时间与连续倒塌的SDOF模型周期比τ<0.2时，可忽略破坏时间的影响；当τ>3.0时，可采用静力方法计算结构响应；当0.2
The influence law of failure time and residual bearing capacity of the steel columns on progressive collapse of steel frames was studied by using a single degree of freedom (SDOF) model. The displacement of the steel frames decreases as the failure time and residual bearing capacity of the steel columns increase. On the basis of the theoretical solution of the SDOF model, boundary condition of the model was determined to consider the failure time effect. τ was defined as the ratio of the failure time to natural period of the SDOF model. For τ<0.2, the failure time can be ignored. For τ>3.0, a static method can be used to estimate the structure behavior. However, for 0.2