基于ABAQUS抗震钢板剪力墙的弹塑性动力分析模块

ABAQUS Based Module for Elasto-Plastic Dynamic Analysis of Aseismic Steel Plate Shear Walls

钢板剪力墙的条带模型(Strip Model,SM)不仅能准确地模拟出钢板的屈曲后行为,而且能明显地节省计算资源。因此,基于ABAQUS平台,开发出抗震钢板剪力墙条带模型的用户单元子程序(称为UEL for SM)。为验证此子程序的有效性,使用ABAQUS和该子程序对一个4层单跨钢板剪力墙的试验模型结构进行了建模与数值分析。在模型结构每层、每个方向设置10个条带,则每层总计20个条带。通过单调加载分析发现2%屈服后强化模量与初始弹性模量比能够更准确地模拟钢板的试验结果;进而进行循环加载的数值模拟。数值验证表明,在模型结构层间位移角小于1/40时,开发的用户单元子程序结果与试验结果吻合很好。

Strip model ( SM) using tension-only strips is capable of predicting the post-buckling behavior of steel plate shear walls ( SPSWs) with economical computation costs. This paper presents a user subroutine developed for evaluating seismic resistance of SPSW ( named UEL for SM) ,in commercial finite element software ABAQUS. The validity of UEL for SM is established through comparing against the test results on a four-floor single-bay of SPSW. It is found that under monotonic loading,utilizing a ratio of 2% of post-yield strain hardening to initial elastic modulus for steel plates achieved better fit with test results. Thus,the analysis was carried out on SPSW under cyclic loading using the above post-yield to elastic modulus ratio. The predictions from UEL for SM are compared to those obtained from experiments,and a good agreement is obtained when the story drift is smaller than 1/40.