带有斜撑的钢桁架数值简化分析及抗震性能

Numerical simplified analysis and seismic performance of steel truss with diagonal braces

为了探究带有斜撑的钢桁架结构简化分析及抗震性能,基于有限元软件ABAQUS6.10平台,对以往试验中的试件进行模型简化分析.利用位移延性系数和等效粘滞阻尼系数来评价该结构的抗震性能,数值分析中普通支撑采用B31梁单元,屈曲约束支撑采用T3D2桁架单元.结果表明,采用T3D2桁架单元模拟屈曲约束支撑,采用B31梁单元模拟普通支撑是合理的.通过考察结构的滞回性能、延性系数及等效粘滞阻尼系数,表明带有屈曲约束支撑的钢桁架结构具有良好的抗震性能.

In order to explore the simplified analysis and seismic performance of steel truss with diagonal braces,the simplified analysis for the samples from the previous experiments was carried out based on the finite element software ABAQUS6. 10 platform. The seismic performance of the structure was evaluated with the displacement ductility coefficient and equivalent viscous damping coefficient. In the numerical analysis,the B31 beam element was used for the ordinary braces,and the T3D2 truss element was used for the buckling restrained braces. The results showthat it is reasonable to simulate the buckling restrained braces with the T3D2 truss element and to simulate the ordinary braces with the B31 beam element. Through studying the hysteretic behavior,ductility coefficient and equivalent viscous damping coefficient of the structure,it is noted that the steel truss structure with the buckling restrained braces has good seismic performance.