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在原始宏观模型的基础上构建了适用于大开洞混凝土剪力墙的改进宏观计算模型。剪力墙中的框架柱、梁由刚体、轴力弹簧和剪切弹簧构成;墙板由钢筋拉杆和混凝土压杆构成。在改进模型中考虑了原始模型所忽略的洞口附加钢筋以及与其相交的钢筋拉杆和混凝土压杆的影响,使钢筋拉杆、混凝土压杆与附加钢筋在洞边形成拉压杆节点,从而使分析结果更贴近于大开洞剪力墙的实际受力状态。以洞口面积相同但开洞位置不同的两片带框架剪力墙作为分析对象,运用改进宏观计算模型对水平承载力-层间变形角关系、刚度及洞口位置不同所引起的杆件应力分配情况进行研究,并与试验结果进行对比。结果表明,改进模型构筑简便,极限承载力的计算值精度较原始模型大为提高,能够把握开洞剪力墙剪切变形的关键特征。
Based on the original macroscopic model, an improved macroscopic calculation model suitable for large-opening concrete shear walls is constructed. The frame column in the shear wall consists of a rigid body, an axial force spring and a shear spring. The wall plate consists of a steel bar and a concrete pressure bar. In the improved model, the influence of the additional rebar in the hole and the tie bars and concrete pillars which are neglected by the original model are neglected, and the tie bars of the concrete tie bar, concrete tie bar and additional rebar are formed on the edge of the hole so that the analysis result More close to the actual opening of the shear wall stress state. Taking two pieces of frame-shear wall with the same hole area and different hole positions as the analysis objects, the stress distribution of the bars caused by the difference of the horizontal bearing capacity, the deformation angle, the stiffness and the location of the hole is analyzed by using the improved macro calculation model Study, and compared with the test results. The results show that the improved model is easy to construct and the calculated value of ultimate bearing capacity is much higher than the original model, which can grasp the key features of shearing deformation of open shear walls.