约束屈曲支撑受力性能及高阶模态分析

Analysis of mechanical behavior and high-order mode of buckling-restrained bracing

应用ANSYS对约束屈曲支撑在静力往复荷载作用下的受力性能进行模拟,通过计算得到支撑滞回曲线以及其内部应力分布状况.追踪支撑内核高阶模态屈曲的过程,结果表明约束屈曲支撑具有良好的耗能特性.通过对14个不同缝隙和5个不同摩擦系数的约束屈曲支撑进行计算,得出缝隙和摩擦力对约束屈曲支撑内力的影响.应确定合理的缝隙尽量减小磨擦力.

The bearing performance of buckling-restrained brace under horizontal low cycle loading BRB was simulated by using commercial software ANSYS. The supporting hysteretic carve and distribution of the internal forces of buckling-restrained brace were obtained by means of computation and high-order mode buckling process was tracked down. The results demonstrated that there was a good energy consumption characteristics with this kind of bracing. The influence of the gap between core steel-plate and exterior concrete as well as friction force of BRB on internal forces was obtained through analysis of fourteen models with different gaps and five models with different friction coefficients, so that reasonable gaps should be determined and the friction decreased.