双钢板-混凝土组合剪力墙变形能力分析

基于纤维法和精细材料本构模型，编制了双钢板-混凝土组合剪力墙的截面分析程序，并通过已有试验验证了分析结果的准确性。通过对6379个不同参数的双钢板-混凝土组合剪力墙的计算分析，得到了影响剪力墙截面变形能力的主要因素有考虑钢板作用的轴压比、混凝土强度、墙身的材料配比和暗柱混凝土的约束效应。研究结果表明：回归分析得到的双钢板-混凝土组合剪力墙截面极限曲率的计算公式满足精度要求并偏于安全；在此基础上，提出了双钢板-混凝土组合剪力墙基于位移的设计方法。同时，根据国内规范的设计方法，给出了双钢板-混凝土组合剪力墙的轴压比限值：对于C50以下的混凝土，双钢板-混凝土组合剪力墙的设计轴压比的限值为0.45；对于C50以上的混凝土，设计轴压比的限值可建议按n_2d,lim=-0.004f_cu+0.625计算。

Deformability analysis of composite shear walls with double steel plates and infill concrete

Based on the fiber section analysis method and refined material constitutive model, a section analysis program for the composite shear walls with double steel plates and infill concrete was developed. The program was verified to be accurate by the available test results. From analysis of the calculated results of 6 379 composite shear walls with double steel plates and infill concrete, axial compression ratio, concrete strength, steel content ratio and confinement of concrete in the boundary columns were found to be the main factors that affect the deformability of composite shear walls with double steel plates and infill concrete. Research results show that simplified formulas for calculating the ultimate curvature obtained from the parameter study is accurate enough and on the safe side. On these basis, a displacement-based design approach for composite shear walls with double steel plates and infill concrete was proposed. For the Chinese design code, upper limit values for the axial compression ratio were provided: for concrete strength below C50, the upper limit value of the axial designed compression ratio was 0.45; for the concrete strength above C50, the upper limit value of the axial designed compression ratio can be calculated using formula n _2d,lim=-0.004f_cu+0.625.