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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<τ<3.0时,需考虑破坏时间对结构连续倒塌的影响.通过对钢柱等效SDOF模型的理论分析,当其抗力模型分别为理想弹塑性和刚塑性条件时,求得柱子破坏时间的近似计算方法,并以爆炸作用后柱子变形为初始状态,结合数值方法给出钢柱残余承载力计算过程.通过对钢柱的破坏时间和残余承载力对结构倒塌影响的算例分析,表明钢柱的破坏时间(越长)和残余承载力(越大)对结构抗倒塌起有利作用,在结构抗倒塌计算时不可忽略.
The continuous collapse single-degree-of-freedom (SDOF) analysis model was established to study the influence of steel column failure time and its residual bearing capacity on the continuous collapse of steel frame. The longer the steel column failure time, the larger the residual bearing capacity and the displacement response Based on the theoretical solution of the response of SDOF model, the criterion for whether the failure time of steel columns is taken into account in the calculation of steel frame collapse is obtained: when the ratio of failure time of steel columns to SDOF model with continuous collapse τ <0.2, When τ> 3.0, the static response can be calculated using the static method. When 0.2 <τ <3.0, the influence of failure time on the continuous collapse of the structure must be considered. By the theory of the equivalent SDOF model When the resistance model is ideal elastic-plasticity and rigid plasticity, respectively, the approximate calculation method for the failure time of the column is obtained. After the explosion, the deformation of the column becomes the initial state, and the calculation of the residual bearing capacity of the steel column Through the analysis of the influence of the failure time and the residual bearing capacity of the steel column on the structural collapse, it is shown that the failure time (longer) and the residual bearing capacity Role in the anti-collapse structural calculation can not be ignored.