超薄加劲钢板剪力墙受剪性能试验研究及数值分析

Experimental study and numerical analysis of shear behavior of ultrathin stiffened steel plate shear walls

对于超薄加劲钢板剪力墙,由于钢板超薄,采用传统焊接工艺将导致严重的焊接变形,故需要采用改进焊接工艺,即将钢板墙在加劲肋处断开,进行弯折组合后焊接并形成加劲肋。为研究采用改进焊接工艺完成的超薄加劲钢板剪力墙的受剪性能,进行了足尺试件的受剪性能试验,研究了钢板墙的受剪破坏形态、滞回特性、承载能力及耗能能力等,验证了在竖向加劲肋位置采用的改进连接构造及焊缝工艺满足受剪承载力要求,并对不同钢柱截面、不同墙宽高比对钢板墙受剪性能的影响进行了对比分析。结果表明:采用改进工艺的钢板剪力墙满足受剪承载力要求且具有稳定的耗能能力,随着钢柱截面积增大,钢板墙的侧移刚度、峰值荷载均有所增加,相应的极限位移、耗能能力有所下降;随着墙宽高比减小,钢板墙的侧移刚度、屈服荷载、峰值荷载均相应降低,相应的极限位移、耗能能力有所提高。采用通用有限元分析软件ANSYS对超薄加劲钢板剪力墙的受剪性能试验进行了数值模拟,有限元结果与试验结果总体吻合良好,有限元分析可以很好地模拟超薄加劲钢板剪力墙的全受力过程和破坏模式。

In ultrathin stiffened steel plate shear walls,the traditional welding process may lead to serious welding deformation due to the rather small thickness of the plate.To address this issue,a new welding process is needed,in which the steel plate wall is broken at the location of the stiffener and then welded and combined to form a stiffener.In order to study the shear behavior of ultrathin stiffened steel plate shear walls adopting the new welding process,this paper presented experiments of full-scale specimens,whose shear failure pattern,hysteretic properties,load-carrying capacity and energy dissipation capacity were studied.It was verified that the new joint construction and the welding process used in the vertical stiffener can meet the requirements of shear capacity,and the influence of different steel column sections and wall width-to-height ratios on the shear resistance of steel walls were compared.The results indicate that the steel plate can meet the requirements of shear capacity and has a stable energy dissipation capacity.With the increase of size of steel column section,the lateral stiffness and bearing capacity increase,while the ultimate displacement and energy dissipation decrease.With the decrease of wall width-to-height ratio,the lateral stiffness,yield capacity and peak bearing capacity of steel plate walls decrease correspondingly,and the corresponding ultimate displacement and energy dissipation capacity increase.The general finite element analysis software ANSYS was used to simulate the shear behavior of ultrathin stiffened steel plate shear walls adopting the new welding process.The finite element results are in good agreement with the experimental results,and exactly simulate the full load-carry process and failure mode of ultrathin stiffened steel plate shear walls.