湖南大学学报（自然科学版）2016，Vol.43Issue(5)：1-8,8.
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∗
Effects of Steel Column’s Failure Time and Residual Bearing Capacity on Progressive Collapse of Steel Frames Subj ected to Blast
摘要
Abstract
The influence law of failure time and residual bearing capacity of the steel columns on pro-gressive collapse of steel frames was studied by using a single degree of freedom (SDOF)model.The dis-placement 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.τwas defined as the ratio of the failure time to natural period of the SDOF model.Forτ<0.2,the failure time can be ignored.Forτ>3.0,a static method can be used to estimate the structure behavior.However,for 0.2<τ<3.0,the failure time should be considered in the progressive collapse analysis.When the resistance model is ideal elastic-plastic and rigid-plastic,the equiv-alent SDOF model of the steel columns can be theoretically analyzed to determine the calculation method of the failure time.Considering the deformation of the steel columns after explosion as the initial state,the calculation process for the residual bearing capacity of the steel columns is gained by combining with nu-merical calculations.The results show that the failure time and residual bearing capacity significantly influ-ence on the progressive collapse of the steel frames,and those effects should be considered in the progres-sive collapse analysis.关键词
钢框架/连续倒塌/破坏时间/残余承载力/单自由度模型Key words
steel frame/progressive collapse/failure time/residual bearing capabicity/single degree of freedom model分类
建筑与水利引用本文复制引用
李国强,杨涛春,陆勇,陈素文..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∗[J].湖南大学学报（自然科学版）,2016,43(5):1-8,8.基金项目
国家自然科学基金国际合作与交流项目(51120185001),Projects of International Cooperation and Exchanges NSFC (51120185001) （51120185001）
