摘要
以中车科技文化展示中心大型空间管桁架钢结构项目为研究对象,通过敏感性分析,合理选取结构关键构件,并运用等效荷载瞬时卸载法对各失效工况下的剩余结构进行连续倒塌的动力分析,评估结构抗连续倒塌的能力。此外,探讨在不同荷载、不同最大应力比情况下,结构动力放大系数值变化的规律。分析结果表明:该结构在采用备用荷载路径设计法进行抗连续倒塌分析时,等效荷载P的加载时间t0取30倍剩余结构自振周期可以满足精度要求;在静力分析时,结构动力放大系数值随结构最大应力比增大而增大,随作用荷载的增大而减小。
The CRRC culture centre of science and technology was analyzed to discuss the progressive collapse of large space tube truss structure. The sensitivity analysis method was applied to choose the important components of the whole structure,which was based on conceptual estimate. The alternate path method（ AP method） was used to evaluate the capability of the resistance to progressive collapse. The paper discussed the regular pattern of the dynamic increase factor（ DIF） with the changes of the loading and the maximum of stress ratio. The results demonstrated that when using the alternate path method to analyze the structure,the reasonable value on the unloading time of equivalent load was 30 of the vertical vibration period of component failure model; the DIF increased with the increase of the maximum of stress ratio,and decreased with the increase of the load.
作者
舒兴平
卢宇洁
卢倍嵘
刘泽龙
SHU Xingping LU Yujie LU Beirong LIU Zelong(Steel Structural Institute of Civil Engineering College, Hunan University, Changsha 410082, China Hunan University of Science and Technology, Xiangtan 411201, China)
出处
《工业建筑》
CSCD
北大核心
2017年第10期146-152,共7页
Industrial Construction
基金
国家自然科学基金项目(51278178)
关键词
大型空间管桁架结构
连续性倒塌
备用荷载路径设计法
动力放大系数
large space tube truss structure
progressive collapse analysis
the alternate path method
dynamicincrease factor
