销钉式防屈曲支撑在结构抗震加固中的应用研究

Applied Research of Pin Type BRB in Structural Seismic Strengthening

销钉式防屈曲支撑具有普通防屈曲支撑良好耗能的特点,本文对此支撑进行抗震加固分析。原结构存在超筋、层间位移角不满足规范限值的问题,采用非线性有限元软件SAP2000进行了加固抗震分析,对比了多遇地震作用下销钉式防屈曲支撑框架结构与普通防屈曲支撑框架结构模拟结果。结果显示装有销钉式防屈曲支撑的框架结构层间位移角与结构基底剪力减小率优于普通防屈曲支撑框架结构;罕遇地震作用下,采用Perform-3D有限元分析软件进行分析,分析结果表明:安装了销钉式防屈曲支撑的框架结构不仅能够满足抗震规范的层间位移角还有助于减小柱子所受压应变,并且销钉式防屈曲支撑耗能饱满,保证了框架结构的安全。

Pin type BRB has common BRBs good characteristics of energy dissipation,the brace com be used in the seismic reinforcement analysis. Because the over bar and the inter-story displacement angle of the structure are not satisfied with the requirement of the standard,therefore,the analysis of seismic strengthening is carried out by using the nonlinear finite element software SAP2000 pin type buckling restrained braced frame structure is compared with the general buckling brace frame structure under small earthquake. Analysis results show that; the interlayer displacement angle and the decrease rate of structural base shear in the frame structures with pin type BRBs is better than the general buckling restrained braced frame structure. Under severe earthquake,using PERFORM-3D finite element analysis software analysis,the frame structure with pin type BRBs restrained braced can not only satisfy the seismic code layer displacement,and can also reduce the pressure of the column strain,and the pin type BRB restrained brace is full of energy to ensure the safety of frame structure.