双钢板内填混凝土短肢组合剪力墙抗震性能试验研究

摘要

To study the seismic behavior of the short-limb composite shear wall with double steel plates and infill concrete,an one-bay,two and half-story and one-third scale specimen was tested under low reversed cyclic loading.The failure mechanism,hysteretic behavior,ductility,stiffness degradation and energy dissipation of this test specimen were evaluated.Test results show that hysteretic curves of the specimen are full,its deformability and energy-dissipation capacity are excellent,and its lateral stiffness is high.Under low reversed cyclic loading,the web yielded and went into plasticity firstly,followed by the flange of both ends of the coupling beam,the column foot,and the bottom of the shear wall.The tensile fracture of the flange of the coupling beam at the second floor resulted in the failure of specimen.The line rigidity of shear wall is obviously larger than that of coupling beam,and under horizontal loading,the moments at both ends of coupling beam are large,indicating that they shall be the weak parts of the structure.To prevent the damage of connection between beam and free edge of shear wall,the side columns around the free edge of shear wall could be arranged.At the peak load of specimen,its top drift reached 1/50.Additionally,the drift and energy dissipation for the first floor were less than those of the second floor.In the elastic stage and under the same lateral load,the shear strain at the web of coupling beam was the maximum,the normal strain at the foot of side column was relatively large,but the shear strain of the steel plate of shear wall was comparatively small.The FEM results using ABQUS agreed well with the test results.%为了研究双钢板内填混凝土短肢组合剪力墙的抗震性能,进行了2层半单跨1/3缩尺试件的低周反复加载试验,分析了试件在循环荷载作用下的破坏机理、滞回性能、延性、刚度退化规律以及耗能能力.试验结果表明:双钢板内填混凝土短肢组合剪力墙滞回曲线饱满,耗能能力强,延性好,水平刚度较大;循环荷载作用下,连梁腹板首先屈服进入塑形,接着连梁两端翼缘、柱脚和剪力墙底部进入塑性;第2层连梁两端翼缘拉断,导致试件失效;剪力墙的线刚度远高于连梁的线刚度,水平荷载作用下连梁两端弯矩大,为结构的薄弱部位;为避免剪力墙自由边底部与梁连接部位发生破坏,在自由边处应设置边柱加强;试件达到峰值荷载时,顶点位移角为1/50;双钢板内填混凝土短肢剪力墙试件底层变形比2层小,耗能相对2层少;弹性范围内同一水平荷载作用下,连梁腹板的剪应变最大,边柱柱脚的正应变较大,剪力墙钢板的剪应变较小.ABAQUS有限元分析结果与试验结果吻合较好.