偏心支撑半刚接钢框架的模态分析  

Modal analysis of eccentrically braced semi-rigid steel frames

作　　者：石艳[1] 郭兵[1] 田海兰[1] 

机构地区：[1]山东建筑大学土木工程学院,济南250101

出　　处：《建筑结构》2010年第S1期187-190,共4页Building Structure

摘　　要：将偏心支撑与半刚接钢框架相结合,是一种新型的框架支撑体系。偏心支撑可以弥补半刚接钢框架的刚度不足,同时又不降低其延性和耗能能力。运用ANSYS有限元分析软件,建立了4榀6层的半刚接钢框架(1榀框架无偏心支撑,3榀框架有偏心支撑)有限元模型,对框架试件进行模态分析。研究节点初始刚度、支撑条件等因素对框架自振周期的影响。根据分析得出:偏心支撑半刚接钢框架的刚度主要由支撑提供,梁柱的半刚性连接对结构的自振周期无显著影响。在相同参数下,支撑类型对结构自振周期有影响。There formed a new type of braced resistant steel frame,which combined eccentrically braces and steel frames with semi-rigid connections.Eccentrically braces increase the lateral stiffness of steel frames with semi-rigid connections and meanwhile maintain its ductility and energy dissipations.ANSYS was employed to model semi-rigid steel frames with four different support types.Modal analysis of the frames was studied to investigate the dynamic property of eccentrically braced semi-rigid steel frames,which was influenced by rotational stiffness of connections,eccentrically braced type and so on.It is concluded that the stiffness of eccentrically braced semi-rigid steel frames is supported mainly by the supports.The semi-rigid connection has no significant effect on the natural cycle.The types of eccentrically braced have effect in the same parameters.

关 键 词：偏心支撑钢框架 半刚性连接 ANSYS 模态分析 

分 类 号：TU391[建筑科学—结构工程]