两边连接屈曲约束钢板墙动力分析简化模型研究

Research on simplified model for dynamic analysis of beam-connected buckling restrained steel plate shear wall

为简化两边连接屈曲约束钢板墙的动力分析,在等效支撑模型的基础上提出用等效桁架模型代替两边连接屈曲约束钢板墙。等效桁架模型的支撑点取在屈曲约束钢板墙与梁传力的合力点处,斜杆的截面面积和材料强度分别按与两边连接屈曲约束钢板墙的初始刚度和屈服承载力相等进行换算,竖杆的截面面积取屈曲约束钢板墙横截面面积的一半,材料强度与屈曲约束钢板墙相同。对三个不同层数和不同跨数的平面屈曲约束钢板墙-框架结构及相应的等效支撑模型和等效桁架模型分别进行了模态分析和地震响应分析,结果表明两种简化模型的地震响应均与原型结构吻合较好,但等效桁架模型能更准确地模拟原型结构的动力特性,具有更好的适用性。

In order to simplify the dynamic analysis of buckling restrained steel plate shear wall( BRW),equivalent truss model was presented to simulate the beam-connected BRW based on the equivalent brace model. The brace point of equivalent truss model is at the resultant point of transmission forces from BRW to boundary beam. The cross-section area and material strength of diagonal brace can be calculated according to the initial stiffness and yield capacity of the beamconnected BRW. The cross-section area of vertical rod is equal to half of the cross-section area of BRW in horizontal direction,and the material strength of vertical rod is as same as the steel plate in BRW. The accuracy of the simplified model was validated by modal analysis and seismic response analysis comparing to three specimens of framed BRWs structures with different storey and span. The results show that the seismic responses of the two kinds of simplified models are all in good agreement with the framed BRWs structures,but the equivalent truss model can more accurately simulate the dynamic characteristics such as natural frequency and vibration mode of the framed BRWs structures. Thus,the equivalent truss model has better applicability.