轴压比与剪跨比对部分包覆钢-混凝土组合剪力墙抗震性能影响研究

Effects of axial compression ratio and shear span ratio on aseismic performance of PEC shear wall

与传统钢筋混凝土剪力墙相比,部分包覆钢-混凝土组合剪力墙(partially encased composite shear wall,PEC剪力墙)具有自重小、延性好和施工方便等特点。本文通过低周反复加载试验,探究6个PEC剪力墙试件在不同轴压比和剪跨比下的抗震性能,试验结果表明:PEC剪力墙试件均表现为典型的压弯破坏,滞回曲线较为饱满,耗能性能良好。试件极限层间位移角达1/56,超过罕遇地震下规范限值要求,具有良好的变形能力。随着轴压比的增大,试件的刚度和耗能能力呈先增大后减小的趋势,延性降低明显;随着剪跨比的减小,试件的承载力和刚度有较大幅度提高,但其耗能能力降低、刚度退化速度加快。

Compared with traditional reinforced concrete shear wall,partially encased steel-concrete composite(PEC)shear wall has characteristics of small self-weight,good ductility and convenient construction.Here,aseismic performances of 6 PEC shear wall specimens under different axial compression ratios and shear span ratioswere investigated with low cycle repeated loading tests.The test results showedthat PEC shear wall specimens all exhibit typical compression bending failurewith full hysteretic curves,and good energy dissipation performances;their ultimate inter-story displacement angles reach 1/56 to exceed the limit value of the code under rare earthquakes and have good deformation capacity;with increase in axial compression ratio,stiffness and energy dissipation capacity of specimens increase firstly and then decrease,and ductility decreases obviously;with decrease in shear span ratio,load-bearing capacity and stiffness of specimens increase greatly,but their energy dissipation capacity drops and their stiffness degradation speed accelerates.