摘要
通过引入Pandey提出的敏感性指标,给出钢塔架关键杆件的识别方法。基于备用荷载路径设计法,对钢塔架结构在风荷载作用下的连续倒塌进行线弹性静力、非线性静力、线弹性动力、非线性动力等4种分析。结果表明:结构动力响应的大小取决于风荷载作用方向及关键杆件出现的位置;线弹性静力分析是偏于保守,非线性动力分析是更加精确的;建议采用非线性动力方法对钢塔架进行连续倒塌评估。通过失效杆件的等效反力卸载过程,模拟钢塔架连续倒塌的动力过程,提出了等效反力的初始持续时间t0(考虑初始状态)和卸载时间tp的计算方法。
By introducing the sensitivity index proposed by Pandey,the method of identifying the key members of the structure is put forward.Based on the alternate load path method,the progressive collapse analysis of the steel tower structure under wind load was conducted by 4 different methods： linear static analysis,nonlinear static analysis,linear dynamic analysis,nonlinear dynamic analysis.The results show that the structural dynamic response depends on the direction of wind load and the position of key members,and linear static analysis is conservative while nonlinear dynamic analysis is more precise.It is recommended that nonlinear dynamic analysis should be taken to assess the progressive collapse of steel tower structure.Through unloading the equivalent force of failure element,the dynamic process of progressive collapse of steel tower structure was simulated.The computational methods of the initial duration t0（considering initial state） and unloading time tp for equivalent force are presented.
出处
《工程力学》
EI
CSCD
北大核心
2013年第4期322-330,共9页
Engineering Mechanics
基金
江苏省自然科学基金项目(BK2009287)
江苏省产学研前瞻性联合研究项目(BY2012200,BY2009151)
关键词
钢塔架
连续倒塌
备用荷载路径设计法
关键杆件
敏感性
风荷载
steel tower structure
progressive collapse
alternate path load method
key member
sensitivity
wind load
