Y形偏心支撑竖向布置方式对结构抗震性能的影响

Effects of Vertical Layout of Y-shaped Eccentrically Braces on Seismic Performance of Structure

为了研究支撑竖向布置不同的Y形偏心支撑钢框架的抗震性能,采用有限元分析软件ABAQUS对3个支撑竖向布置和构造不同的试件进行模拟循环加载,分析试件在循环荷载作用下的破坏机理、滞回性能、延性及耗能能力。研究结果表明:Y形偏心支撑钢框架是一种典型的双重抗震结构体系,具有良好的滞回性能;竖向正反交替布置的Y形偏心支撑中,与耗能梁段直接相连的框架梁跨中节点受力较大,可采用加厚腹板等方式加强,本文给出了设计方法;局部加强后,竖向正反交替布置的Y形偏心支撑钢框架具有与传统Y形偏心支撑钢框架同样良好的抗震性能,可应用于实际工程。

In order to research the seismic performance of Y-shaped eccentrically braced steel frames with different vertical layout of braces,finite element analysis software ABAQUS is used to apply cyclic loads on 3 specimens with different vertical layout of braces and constructional details,and the failure mechanism,hysteretic behavior,ductility and energy-dissipation of specimens are analyzed. The research results show that Y-shaped eccentrically braced steel frame is a typical dual seismic resistant structure system with a good hysteretic behavior. The midspan of beam,which is connected with links in the Y-shaped eccentrically braced steel frame with the vertical layout that Y-shaped braces turns positive and negative,bears more force and needs to be reinforced by increasing thickness of web. The corresponding design method is put forward in this article. The reinforced Y-shaped eccentrically braced steel frame with the vertical layout that Y-shaped braces turns positive and negative,which also can be used in engineering,has the equally good seismic performance as the traditional Y-shaped eccentrically braced steel frame.