轴压比对框架节点抗震性能影响的数值模拟分析

运用ANSYS有限元分析软件制作3个相同的钢筋混凝土框架节点模型,在控制竖向轴压力的条件下,当轴压比分别为0.3,0.5,0.7时,对其进行低周反复加载,研究框架节点的抗震性能,包括裂缝开展情况、延性、耗能能力等的变化规律。研究结果表明:在一定程度内,随着框架柱端轴压力的增加,框架节点核心区混凝土的约束作用逐步增强,节点核心区的剪切变形被有效地限制,而抗剪承载力、耗能能力得到了一定的提高。

A Numerical Simulation Analysis of the Influence of Axial Compression Ratio on the Seismic Capacity of Frame Nodes

Three identical reinforced concrete frame node models have been made by utilizing ANSYS finite element analysis software. A reversed low cycle loading has been made on the seismic capacity of frame nodes, under the control of vertical shaft pressure, with its axial compression ratios being 0.3, 0.5, 0.7. A research has thus been conducted on the seismic capacity of frame nodes, as well as the change regulation of crack development, ductility, and energy dissipation capacity. The results show that, to a certain extent, with the increase of frame column end shaft pressure, the restraint effect of concrete in the core area of frame nodes gradually increases, the shear deformation in the core region of the frame nodes is effectively limited, and the shear bearing capacity and energy dissipation ability is improved to some degree.