摘要
关键构件失效后,多层框架各层表现出不同的抗倒塌机制,空腹效应是一种重要的抗连续倒塌机制。采用考虑损伤与应变率的动力非线性分析,模拟已有多层框架拆柱试验,并提出空腹效应理论模型;改进抗震设计常用的中心支撑钢框架,在框架结构顶层布置水平支撑;并将水平支撑体系应用到俄亥俄综合大楼。研究结果表明,空腹效应是竖向构件对各层内力重分配的结果,体现了框架结构的整体受力特点,空腹效应与其它抗倒塌机制共同抵抗不平衡荷载;顶层水平支撑可以显著减小失效点处位移,发挥空腹效应作用,提高结构的抗连续倒塌性能;俄亥俄综合大楼的两根中柱失效后,支撑体系将失效跨的大部分重力传递到相邻结构。
Multi-story frame structures exhibit different anti-collapse mechanisms after key components failed.The Vierendeel action is one of the important anti-progressive collapse mechanisms.The dynamic non-linear analysis considering damage and strain rate was used to simulate column-removal tests by other scholars on multi-story frames,and a theoretical model of the Vierendeel action was proposed.Then,the steel concentrically braced frame commonly used in seismic design was improved,and horizontal bracing was arranged on the top story.Finally,the horizontal bracing system was applied to the Ohio Union building.The results show that the Vierendeel action is the result of the internal forces redistribution among the vertical members,which reflects the overall stress characteristics of the frame structure.The Vierendeel action and other anti-collapse mechanisms together resist the unbalanced load.The top horizontal bracing can significantly reduce the displacement at the failure point,play the role of Vierendeel action,and improve the progressive collapse resistance of the structure.After two middle-column of the Ohio Union building fail,the bracing system transfers most of the gravity of the failed span to the adjacent structure.
作者
乔惠云
魏建鹏
田黎敏
QIAO Huiyun;WEI Jianpeng;TIAN Limin(College of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fuzhou 350118,China;College of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第24期115-121,157,共8页
Journal of Vibration and Shock
基金
国家自然科学基金青年科学基金(51608433)
福建省科技厅引导性(重点)项目(2016H0004)
关键词
连续性倒塌
多层框架结构
中心支撑钢框架
动力效应
空腹效应
progressive collapse
multi-story frame structure
steel concentrically braced frame
dynamic effect
vierendeel action
作者简介
第一作者:乔惠云,女,博士,讲师,1981年生。
