摘要
交错桁架结构体系的纵向为多跨框架结构,结构纵向可以通过设置(耗能)支撑的方式改善其抗震性能。而横向为单跨(大跨度)交错桁架体系,研究和试验结果表明,交错桁架横向在地震作用下桁架边跨的腹杆一般首先进入塑性,发生破坏,从而在局部形成空腹桁架,桁架的刚度和承载力大幅度下降,这对整榀桁架的受力非常不利,甚至可能会出现整体倒塌。因此,《交错桁架钢结构设计规程》对该结构形式在高烈度区的应用做出了明确的限制。本文以一幢10层的交错桁架结构为例,采用Push-over的方法分析该结构体系的破坏过程,研究结构构件的屈服顺序和机制,并通过设置耗能支撑的方式提高交错桁架结构的抗震性能,探索交错桁架结构应用于高烈度区的可行性,并对设计提供参考。
The longitudinal of staggered truss structure system is multi-span frame structure.The seismic performance of staggered truss structure can be improved by setting(energy dissipation)braces.The research and test results show that the web members of the side span of the staggered truss generally enter the plastic damage first under the earthquake action,thus forming the hollow truss locally,and the stiffness and load-bearing capacity of the truss decrease greatly,which is very weak for the whole truss,and may even collapse as a whole.Therefore,the Code for the Design of Staggered Truss Steel Structures clearly limits the application of this structural form in high intensity areas.Taking a 10-storey staggered truss structure as an example,this paper uses Push-over method to analyze the failure process of the structure system,studies the yielding sequence and mechanism of structural components,and improves the seismic performance of staggered truss structure by setting energy dissipation braces,and explores the feasibility of applying staggered truss structure to high intensity areas.It provides reference for design.
作者
徐继东
王平山
安东亚
XU Ji-dong;WANG Ping-shan;An Dong-ya(East China Architectural Design Research Institute Co.Ltd.,Shanghai 200011)
出处
《河南城建学院学报》
CAS
2020年第3期7-12,共6页
Journal of Henan University of Urban Construction
基金
国家重点研发计划课题(2017YFC0703809)。
