双肢短肢剪力墙的弹塑性分析

应用带刚域的弹塑性杆单元来模拟短肢剪力墙的连梁和墙肢,并考虑剪切变形影响,分析了水平侧向荷载作用下双肢短肢剪力墙的弹塑性过程,并研究了肢强系数、整体性系数、翼缘宽度和连梁配筋率等参数其塑性性能的影响。结果表明,水平侧向荷载作用下,短肢剪力墙的连梁先于墙肢屈服,所有的连梁都屈服后,剪力墙还有较大的承载能力和变形能力。最后,底层墙肢随着荷载的增加达到屈服极限,结构丧失承载能力;在墙肢截面和配筋率一定时,随着肢强系数的增加、整体性系数的减小和连梁配筋率的降低,短肢剪力墙的承载能力降低,延性增加;而随着墙肢翼缘宽度的增加,短肢墙的承载力和延性都增加。因此在设计中,通过合理选择这些参数,可以使短肢剪力墙具有较高的承载力和良好的延性。

ELASTOPLASTIC ANALYSIS OF SHEAR WALL WITH DOUBLE SHORT LIMBS

Considering the influence of shear deformation,the frame elements with rigid arms were adopted to simulate the coupling beams and limbs of short limb shear walls and the elastoplastic processes of them under lateral loading were analyzed.The influences of limb strength coefficients,integral coefficients,flange widths of limbs,and the reinforcement ratios in coupling beams on nonlinear behavior of the wall were investigated.The results indicate that with the increase of limb strength coefficient as well as the decrease of integral coefficient and the rebar ratio in coupling beams,the load capability of short limb shear wall decreases,however,its ductility increases on condition that the cross sections and their rebar ratios keep constant.In addition,with the increase of flange width of limbs,both the load capability and ductility of the wall increase.Therefore,by reasonable choosing these parameters mentioned above in design,the wall can be made with better performances in load capacity and ductility.