局部削弱型防屈曲约束支撑有限元数值分析

为实现防屈曲约束支撑定点屈服并兼具可装配的功能,文中提出一种新形式的装配式局部削弱型防屈曲约束支撑。为研究该新型防屈曲约束支撑的性能,采用ABAQUS有限元软件对试件进行数值模拟。研究结果表明,局部削弱可以实现定点屈服,但开孔不宜过大,否则出现严重的局部屈曲。间隙和较小的初始缺陷对构件性能基本无影响。随着加劲肋的增多,构件的滞回曲线越饱满。内芯构件的屈服点越低,耗能系数越大。

FINITE ELEMENT NUMERICAL ANALYSIS OF LOCALLY WEAKENED BUCKLING RESTRAINED BRACES

In order to realize the fixed-point yielding and assembly function of buckling-resistant braces, a new type of assembled partial weakened buckling-resistant braces is proposed in this paper. In order to study the performance of the new buckling-resistant brace, ABAQUS finite element software was used to simulate the specimen. The results show that the local weakening can achieve the fixed-point yield, but the opening should not be too large, otherwise serious local buckling will occur. The clearance and small initial defects have little effect on the performance of the component. With the increase of stiffeners, the hysteretic curves of members become fuller. The lower the yield point is, the greater the energy dissipation coefficient is.