钢板剪力墙简化分析模型研究

Simplified Analytical Models of Steel Plate Shear Walls

钢板剪力墙是一种适用于高烈度区高层及超高层建筑抗震的新型抗侧力结构体系.在强震作用下,钢板剪力墙墙体将出现较大的面外变形,并沿对角线方向形成一系列的斜向拉力带,拉力带屈服进入塑性阶段承载,是典型的二维板单元非线性问题.由于墙板的二维非线性精细模型计算难度大、耗时长,需要采用合理的简化分析模型,以满足结构设计中高效性及准确性两方面的要求.本文总结和分析了近年来各国学者提出的钢板剪力墙简化分析模型,并利用ABAQUS建立了17个不同高厚比、不同宽高比的单层单跨钢板剪力墙的二维精细分析模型和5种主要简化分析模型.通过对107个模型的非线性推覆分析,广泛对比了各种简化分析模型对不同宽高比范围内的薄墙板及中厚墙板抗震性能模拟的准确性.在综合考虑分析效率及准确性的基础上,提出了不同设计范围内的钢板剪力墙结构简化分析模型的合理选择方案,并讨论了今后研究的发展方向.

Steel plate shear wall(SPSW)is a new type of lateral load-resisting system suitable for the seismic resistance of high-rise and super high-rise buildings in high seismic zones.Under strong earthquake effects,the wall panels of SPSWs will undergo large out-of-plane deformation and form a series of diagonal tension zones,which will resist the lateral load after yielding and enter the plastic zone,making this a typical2D nonlinear plate problem.Since the detailed2D model of the wall panel is difficult to analyze and time-consuming,it is necessary to adopt a reasonable simplified analytical model for the wall panel,in order to meet the requirements of both efficiency and accuracy during the design process.In this paper,various simplified analytical models for SPSWs proposed in recent years by scholars around the world were listed and discussed,and a series of one story-one bay SPSW models were constructed using ABAQUS for17different cases of wall height-to-thickness ratio and aspect ratio,each case with one detailed2D model and five major simplified models.Through nonlinear pushover analyses of107,models,the accuracy of the five simplified models in simulating the seismic behavior of thin and medium-to-thick wall plates under different ranges of aspect ratio is compared extensively.Based on both modeling efficiency and accuracy,a rational selection scheme is proposed for simplified analytical model of SPSWs in different design ranges,and future research directions are discussed.