钢管中心支撑滞回性能的数值模拟

Numerical modelling on cyclic performance of steel tubular braces in concentrically braced frame

在中心支撑钢框架结构体系中,支撑作为主要的抗侧力构件,其滞回性能直接影响结构的整体抗震性能。本文对单向铰接约束的圆钢管截面和椭圆钢管截面支撑构件进行了循环加载有限元模拟,研究了长细比、径厚比、截面形式等参数对滞回性能的影响。分析结果表明:长细比显著影响钢管支撑构件的承载能力,径厚比显著影响支撑的耗能能力,绕强轴弯曲的椭圆钢管支撑具有更好的耗能能力。

In concentrically braced framing system,the braces resist the lateral forces. Hysteretic performance of the braces may significant impact the seismic response of the system. In this paper,finite element analysis was conducted to simulate the cyclic behaviour of elliptical hollow section( EHS) and circular hollow sections( CHS) with pinned and fixed end conditions. The aims were to investigate the influence of the cross-section slenderness,member slenderness and section shape on the hysteretic performance. Numerical results show that the member slenderness affect on the ultimate load; the cross-section slenderness would significant impact on the energy dissipation capacity. In addition,EHS specimens dissipate more energy than its CHS counterparts.