不同轴压比下ECC双钢板混凝土组合剪力墙的抗震性能

Seismic performance of ECC double-steel-concrete composite shear walls with different axial compression ratios

为分析不同轴压比下ECC双钢板混凝土组合剪力墙的抗震性能,利用有限元软件建立了4组轴压比分别为0.3、0.4、0.5、0.6的ECC双钢板混凝土、普通双钢板混凝土的组合剪力墙模型,对比分析不同轴压比下ECC双钢板混凝土组合剪力墙的滞回曲线、骨架曲线、刚度退化、延性和耗能能力。结果表明:在高轴压比下,ECC双钢板混凝土组合剪力墙结构的滞回曲线捏拢效果十分明显,拥有更好的延性;轴压比为0.6时峰值荷载最大,相较于轴压比为0.3~0.4时的峰值荷载和极限荷载明显滞后,其承载能力和变形能力更好。高轴压比下ECC材料发挥作用更早,其等效粘滞系数更高,耗能能力更好。轴压比为0.6时结构抗震性能最佳。

This paper is an attempt to analyze the seismic performance of ECC double steel plate concrete composite shear walls under different axial compression ratios.The study involves developing models tailored to four groups of ECC double steel plate concrete composite shear wall with axial compression ratios of 0.3,0.4,0.5 and 0.6 by finite element software and comparing and analyzing the hysteresis curve,skeleton curve,stiffness degradation,ductility and energy dissipation capacity of the ECC double-steel-concrete composite shear wall under different axial compression ratios for the ordinary double-steel-concrete composite shear wall model.The results show that under the high axial compression ratio,ECC double steel plate concrete composite shear wall structure has the very obvious hysteretic curve pinching effect,displaying a better ductility;at the axial compression ratio of 0.6,there occurs the largest peak load and compared with the ratio of 0.3-0.4,its peak load and ultimate load lag significantly,showing a better bearing capacity and deformation capacity;under high axial compression ratio,ECC materials operate earlier,displaying a higher equivalent viscosity coefficient and a better energy dissipation capacity;and the axial compression ratio of 0.6 gives the structure the optimal seismic performance.