不同参数钢筋混凝土核心筒抗震性能研究

为了研究钢筋混凝土核心筒的破坏机理和在不同参数下的抗震性能，该文采用基于性能结构分析软件PERFORM-3D，对钢筋混凝土核心筒在静力水平荷载作用下的受力性能进行了三维非线性数值模拟，通过与模型试验结果的对比，验证了所选弹塑性模型分析钢筋混凝土核心筒抗震性能的有效性和准确性。在此基础上，对混凝土核心筒进行参数分析，系统分析了轴压比、连梁跨高比、连梁纵筋配筋率、试件高宽比等不同参数对钢筋混凝土核心筒抗震性能的影响规律。计算结果表明，混凝土核心筒承载力随着轴压比的增大而提高，但当试验轴压比达到0.4后，承载力出现降低，变形能力随轴压比增大而降低；随着高宽比的增大，核心筒承载力降低，变形能力提高，同时，试件破坏模式也发生变化；增大连梁刚度较大地提高了试件承载力，但也严重降低了试件的延性变形性能。此外，通过核心筒试件的弹塑性损伤分析，得到核心筒试件损伤发展顺序以及各构件屈服情况。

RESEARCH ON SEISMIC PERFORMANCE OF REINFORCED CONCRETE CORE WALLS WITH DIFFERENT PARAMETERS

In order to study the failure mechanism and seismic performance of reinforced concrete core walls under different parameters, the concrete core walls under static horizontal loads are simulated using nonlinear analysis and performance assessment program PERFORM-3D. The validity and accuracy of an elastic-plastic model is verified by the comparison between the analytical predictions and test results. On this basis, the parameters on the seismic behavior of reinforced concrete core walls are analyzed, including the effects of axial compression ratio, coupling beam span-depth ratio, coupling beam longitudinal reinforcement rate and height to width ratio. According to the calculation results, the bearing capacity of concrete core walls is improved with the increase of the axial compression ratio. However, when the value of a test axial compression ratio reaches 0.5, bearing capacities are reduced. Deformation capacity reduces with the increase of axial compression ratio. With the increase of height to width ratio, the bearing capacity of concrete core walls is reduced but the deformation capacity is improved significantly. Moreover, the failure mode of core walls with different high aspect ratios is changed. With the increase of coupling beam stiffness, the bearing capacity of core walls increases while ductility deformation capacity reduces seriously. In addition, based on the elastic-plastic damage analysis of a core walls model, the damage development order and component yield situation of core walls are obtained.