轻型钢框架支撑体系振动特性与抗震性能分析

ANALYSIS ON DYNAMIC CHARACTERISTICS AND SEISMIC BEHAVIOR OF CENTRICALLY BRACED STEEL FRAME

摘要: 为了分析不同支撑形式对钢框架结构体系振动特性的影响，利用PKPM软件设计了X型、V型和人字型3种不同支撑形式的12层钢框架支撑结构，提供了主要构件的尺寸和结构的振动特性，再利用有限元软件ANSYS和SAP2000对3种不同支撑的自振特性分别进行了分析，探明了不同支撑形式对该结构体系的动力特性的影响；利用ANSYS软件进行了El-Centro波和上海人工二波输入下的多遇和罕遇地震的弹塑性时程分析，探讨了不同支撑形式的结构地震响应。分析结果表明，V型和人字型对结构刚度的提高比X型的支撑明显，前二种支撑效果非常接近，分析结果可供工程设计人员在结构选型时参考。

Abstract: In order to analyze dynamic characteristics of steel frames with different pattern of braces, three structures with X braces, V braces and inverted V braces were designed utilizing PKPM software. Finite element analyses on these structures were carried out by using ANSYS and SAP2000 to investigate the effects of brace pattern on structural stiffness. Then, time history analysis using El-Centro wave and SHW2 wave were performed. Results show that V braces and inverted V braces are close in improving dynamic characteristics of structures and more effective than X braces.