不同构造内置钢板-混凝土组合剪力墙轴压性能试验研究

Experimental study on embedded steel plate-concrete composite shear walls with various configurations under axial compression

为研究在高轴压比下内置钢板-混凝土组合剪力墙中钢板与混凝土墙体的协同工作性能,以北京中国尊大厦核心筒剪力墙为原型,进行了4个1/4缩尺的内置钢板-混凝土组合剪力墙轴压性能试验。4个试件的几何尺寸相同,区别在于钢板与混凝土连接构造不同。采用单向重复加载方法,分析了各试件的承载力、刚度退化、应力分布、变形能力等,进行了轴压承载力计算。结果表明：各试件达到极限承载能力时,钢板轴力分担比率在25%～32%之间,内置钢板的抗压能力得到发挥;与无拉结钢筋、无栓钉的试件相比,钢板中部设置长栓钉的试件承载力提高23.6%,轴向变形提高22.6%,刚度退化减缓17.42%,钢板与混凝土协同工作性能好;采用强度叠加理论进行内置钢板-混凝土组合剪力墙轴压承载力计算,试验结果与计算值吻合良好。

In order to research the collaborative work performance between steel plate and concrete wall with high axial compression ratio for embedded steel plate-concrete composite shear walls,four 1 /4 scaled wall specimens were tested under axial compression to simulate the core tube shear wall in China Zun Tower. The overall dimensions were identical for four specimens. The main test parameter was the constructional measure for the bonding between steel and concrete. The bearing capacity,stiffness degradation,strain distribution and deformation capacity were compared and analyzed with the method of one-way repeated loading. The axial compressive bearing capacity was calculated. The results show that the axial force sharing ratio of steel plate is between 25% and 32%,so the embedded steel plates behave well in compression at ultimate load. Compared with the specimen without lacing wires and studs,the bearing capacity and the axial deformation of the specimen with long studs are improved by 23. 6% and 22. 6%,the stiffness degradation is slowed down by 17. 42%. The specimen with long studs exhibits good collaborative work performance.The strength superposition theory is adopted when the axial compression bearing capacity of the embedded steel plateconcrete composite shear walls is calculated. The test results are in good agreement with the calculated values.