高轴压比、低剪跨比双钢板-混凝土组合剪力墙拟静力试验研究

QUASI-STATIC TEST ON LOW SHEAR-SPAN RATIO COMPOSITE SHEAR WALL WITH DOUBLE STEEL PLATES AND INFILL CONCRETE UNDER HIGH AXIAL COMPRESSION RATIO

双钢板-混凝土组合剪力墙可减小墙体厚度、提高承载力和延性,为研究双钢板-混凝土组合剪力墙高轴压比下的抗震性能,完成了5个剪跨比为1.0的双钢板-混凝土组合剪力墙试件的拟静力试验,研究了剪力墙在低周往复荷载作用下的受力性能和破坏模式等,分析了轴压比、距厚比等因素对抗震性能的影响。试验结果表明:低剪跨比试件发生弯剪破坏;墙体钢板在平均位移角1/83时发生局部屈曲,初始屈曲形态受距厚比影响显著;试件峰值荷载、位移延性系数、刚度等受轴压比、距厚比的影响较小;试件平均极限位移角达1/72、平均有效破坏位移角达1/52,具有良好的变形能力;距厚比增大,试件滞回性能稳定性降低;试件耗能随变形增大而迅速增长,抗震性能良好。建议低剪跨比双钢板-混凝土组合剪力墙轴压比限值取0.7。

The composite shear wall with double steel plates and inflll concrete has advantages of reducing wall thickness and increasing capacity and ductility. In order to study the seismic performance of a composite shear wall with double steel plates and infill concrete under a high axial compression ratio, quasi-static tests on five composite shear walls with double steel plates and inflll concrete of the shear span ratio of 1 were conducted. The seismic performance and failure modes were observed under low cyclic lateral loads, and the axial compression ratio and distance to thickness ratio on the seismic performance were analyzed. The results indicate that the failure mode of specimens is the flexural-shear failure. Local buckling occurs when the average displacement angle reaches 1/83, and the form of initial buckling is significantly affected by the distance to thickness ratio of steel plate. The specimen peak load, displacement ductility factor and stiffness are less infuenced by axial compression ratio and distance to thickness ratio. The average ultimate displacement angle of the specimens reaches 1/72, and the average effective failure displacement angle is up to 1/52, showing good deformability. The stability of hysteretic behavior of the specimens reduces with the distance to thickness ratio increased. Energy dissipation capacity increases rapidly with the increase of deformation, showing a good seismic performance. The axial compression ratio of a low shear-span ratio composite shear wall with double steel plates and inflll concrete is recommended to take 0.7.