实腹式配钢的型钢混凝土十字形异形柱的抗震性能

Seismic Behaviors of Solid-Web Steel-Reinforced-Concrete Cross-Shaped Columns

为研究实腹式配钢的型钢混凝土(SSRC)十字形异形柱的抗震性能,对4根不同轴压比、配钢率和加载方向的SSRC十字形异形柱进行了低周反复加载试验,记录了试件各阶段的开裂、变形及破坏特点,得到了其荷载-位移滞回曲线、荷载-位移骨架曲线,以及刚度退化、强度衰减、位移延性、耗能能力等力学性能.根据试验结果,对比分析了轴压比、配钢率和加载方向对SSRC十字形异形柱抗震性能的影响.结果表明:剪跨比较大时,试件发生弯曲破坏;SSRC十字形异形柱具有良好的延性、塑性变形能力和耗能能力;与空腹式配钢的型钢混凝土十字形异形柱相比,SSRC十字形异形柱抗震性能良好.

In order to investigate the seismic behaviors of solid-web steel-reinforced-concrete（ SSRC） cross-shaped columns,four column specimens with various axial compression ratios,steel ratios and loading directions were tested by low-cycle reversed loading experiments,and the crack,deformation,failure characteristics of these columns were recorded. Then,the load-displacement hysteretic curves and skeleton curves of the four columns were obtained,and their mechanical properties,namely,stiffness and strength degradation,displacement ductility and energy dissipation capacity,were analyzed. Finally,according to the experimental results,the effects of axial compression ratios,steel ratios and loading directions on the seismic behaviors of SSRC cross-shaped columns were discussed. The results indicate that（ 1） the failure mode of the specimens with large shear span ratio is a bending failure; and（ 2） SSRC cross-shaped columns have favorable ductility,plastic deformation capacity and energy dissipation capacity. In addition,as compared with lattice-style steel reinforced concrete（ LSRC） cross-shaped columns,SSRC cross-shaped columns show better seismic behavior.