文档介绍：2
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第 40 卷第 4 期建筑结构 2010 年 4 月
钢框架结构动力连续倒塌分析
王铁成1 ,2 , 刘传卿1
(1 天津大学建筑工程学院,天津 300072 ; 2 天津市土木工程结构及新材料重点实验室,天津 300072)
[摘要] 采用可考虑塑性分布的梁柱单元模拟材料非线性,并建立了考虑初始变形的动力连续倒塌分析模型。通
过对钢框架结构进行详细的连续倒塌分析,研究了底层柱失效时间对结构响应的影响和竖向荷载传力路径以及梁
的受力机理,并对框架破坏后的连续倒塌状况进行了评估。结果表明,失效时间小于自振周期时,失效时间的长短
对框架的动力响应有显著影响;局部破坏导致上部结构形成新的竖向传力路径,上部不平衡的竖向荷载由失效柱
相邻的柱承担;结构在局部承重柱失效后上部梁中弯矩内力发生重分布现象,失效柱上方的梁端弯矩作用方向发
生改变,且弯矩值明显增大。文中按我国规范设计的框架结构在单根柱失效的情况下不会发生连续倒塌。
[关键词] 连续倒塌; 动力分析; 失效时间; 弯矩重分布
Dynamic progressive collapse analysis of steel frame structure
Wang Tiecheng1 ,2 , Liu Chuanqing1
(1 School of Civil Engineering , Tianjin University , Tianjin 300072 , China ;
2 Tianjin Key Laboratory of Civil Engineering Structure and New Materials , Tianjin 300072 ,China)
Abstract :Using the beam column element considering the distributed plasticity to simulate the inelastic behavior , the model with
initial deformation condition for dynamic progressive collapse analysis was constructed. Through the detailed analysis of a steel
frame structure , the effect of failure time on structure dynamic response was investigated , the new vertical load path and the load
carrying mechanism of beams were analyzed , and eventually the resistance to progressive collapse of the frame was evaluated. It is
shown that when the period of failure time is less than the structural nature period , the effect of failure