双面叠合剪力墙压弯性能的数值模拟分析

    Numerical Study on Behavior of Double-superimposed RC Shear Wall Under Axial Compression and Bending Combination

    • 摘要: 双面叠合剪力墙是一种半预制剪力墙,由2片预制墙板和后浇混凝土通过桁架钢筋连接成整体.为研究其压弯性能,本文利用有限元软件ABAQUS进行双面叠合剪力墙的数值模拟,对轴压比、混凝土强度、边缘构件形式、插筋面积和配箍面积等参数进行分析.模拟结果发现:随着轴压比的增大,墙肢承载力增大,峰值前抗侧刚度增加,同时峰值后变形能力下降,承载力下降加快;高轴压比墙肢受内外混凝土强度变化较低轴压比墙肢更明显;墙肢承载力及变形能力受边缘构件形式影响不大,可采用含预制边缘构件的双面叠合剪力墙提升整体预制率;增加纵筋的搭接钢筋面积可以避免墙肢损伤集中于水平接缝处,使部分损伤转移至搭接区上部,同时墙肢承载力略有提升但峰值后承载力退化加剧;箍筋加密可提升墙肢变形能力.

       

      Abstract: Double-superimposed reinforced concrete shear wall (DRCSW) is a semi prefabricated shear wall structure, which is constituted by two prefabricated panels and cast-in-situ concrete layer. These three parts of concrete are connected by truss. To study the behavior of DRCSWs under axial compression and bending combination, ABAQUS has been used in this paper. Some tested specimens of DRCSW have been predicted to calibrate the numerical modelling method adopted and parameter studies have been carried out. The parameters considered include concrete strength, axial force ratio, boundary elements construction method, overlapped reinforcement bar area and stirrup layout in boundary elements. It has been concluded that increasing axial compression ratio will increase the peak load of the wall and lateral stiffness before peak load while decrease the deformation capacity of the wall. The change of concrete strength on the DRCSW under high axial compression ratio is more obvious than that under low axial compression ratio. The peak load and deformation capacity of the walls are almost the same no matter the boundary element is precast or cast-in-site. The DRCSW with prefabricated boundary elements is more favorable for structure industrial manufacture. Increasing the overlapped reinforcement bar area in the wall boundary elements will slightly improve the bearing capacity of the wall but increase the capacity degradation ratio after the peak load and the damage zone will transfer from the wall bottom to the upper end area of the overlapped reinforcement bar. Increasing the stirrup ratio can improve the deformation capability of the DRCSW.

       

    /

    返回文章
    返回