冷弯薄壁型钢龙骨式剪力墙抗震性能简化及精细化数值模拟研究

Simplified and Refined Numerical Simulation on Seismic Behavior of Cold-Formed Thin-Walled Steel Framed Shear Walls

龙骨式剪力墙作为冷弯薄壁型钢龙骨体系结构的主要抗侧力单元,其抗侧性能是由覆面板、龙骨骨架及其间的自攻螺钉连接的性能决定。建立了基于自攻螺钉连接性能的精细化的冷弯薄壁型钢龙骨式剪力墙的有限元数值模型,并将龙骨与覆面板自攻螺钉连接的恢复力模型引入到剪力墙数值模型中,进行了墙体抗震滞回性能的数值模拟分析。结果表明,计算所得龙骨式剪力墙的弹性刚度、承载力以及变形等特征参数与试验结果吻合较好,该模型能够较为准确地反映龙骨式剪力墙的抗震滞回性能。在此基础上,提出了龙骨式剪力墙数值模拟的简化方法,为房屋整体结构抗震性能的数值分析提供了支撑。

The seismic behavior of framed shear wall,which is the main lateral force resistant assembly of cold-formed thinwalled steel frame,is governed by the behavior of sheathing boards,framed studs and screw connections between framed studs and sheathing boards.A refined finite element numerical model of shear wall is built based on the behavior of screw connections between framed studs and sheathing boards,and a numerical analysis is carried out.The numerical results,including elastic stiffness,shear capacity and peak-point deformation,agree well with the test results,this indicates the numerical model can reflect the seismic behavior of framed shear walls.At last,a simplified numerical method for seismic behavior of framed shear walls is proposed based on the refined numerical simulation of framed shear walls.This can provide support for the future numerical study on seismic behavior of integral buildings.