层数和跨数对薄钢板剪力墙地震力折减系数的影响

Effect of Storeys and Spans on Response Modification Factor and Displacement Amplification Factor of Thin Steel Plate Shear Walls

基于薄钢板剪力墙的等效拉杆理论,利用SAP2000有限元分析软件,并采用改进的能力谱法,通过6个算例研究了层数和跨数对按剪力墙板抗剪承载能力设计的抗弯钢框架薄钢板剪力墙体系在中震下地震力折减系数R、超强系数R_Ω、延性折减系数R_μ和大震下位移放大系数C_d的影响。结果表明：中震下R的变化范围为2.55~2.81,与我国《建筑抗震设计规范》隐含的地震力折减系数2.8125相差不大,R_Ω变化范围为2.51~2.91,R_μ的变化范围为0.9~1.1,大震下C_d的变化范围为3.51~4.12。结构的跨数对R和R_Ω的影响规律都不明显,对R_μ和大震下C_d的影响可以忽略;结构的层数影响较为明显,R、R_μ和大震下C_d都随层数的增加而减小,R_Ω则随层数的增加而增加。

Based on the theory of equivalent tension rod for the thin steel plate shear wall,the improved capacity spectrum method was adopted by the finite element software SAP2000.The effect of storeys and spans on the response modification factor R,overstrength factor R_Ω,ductility reduction factor Rμunder moderate earthquake and displacement amplification factor Cdunder severe earthquake of moment resisting steel frame-thin steel plate shear walls designed by the shear capacity of plate was investigated by six examples.The results show that Rranges from2.55 to 2.81 similar to the 2.8125 that implied in Code for seismic design of buildings,R_Ω is from2.51 to 2.91,Rμranges from 0.9to 1.1under moderate earthquake and Cdis from 3.51 to 4.12 under severe earthquake.The influencing rule of spans on Rand R_Ω isn′t obvious and the spans has almost no effect on R_μ and Cd.The effect of storeys is very obvious,R and Rμunder moderate earthquake and Cdunder severe earthquake decreases with increasing storey,whereas R_Ω increases with increasing storey.