【摘要】 设计6个型钢轻骨料混凝土柱-轻骨料混凝土梁组成的框架中间节点试件,对其抗震性能进行非线性有限元分析。分析中引入型钢和轻骨料混凝土黏结滑移本构关系,考虑钢骨形式、配箍率和轴压比对节点抗震性能的影响。分析试件的滞回曲线、骨架曲线和等效黏滞阻尼系数,得到钢骨形式、配箍率和轴压比对节点抗震性能的影响规律。计算表明:型钢轻骨料混凝土柱-轻骨料混凝土梁组成的框架节点具有较好的抗震性能;增加配箍率、采用十字形钢骨可提高节点的延性和抗震耗能能力;增加轴压比可提高节点的承载力,但使节点的延性和耗能能力下降。更多还原

【Abstract】 Six frame middle joint specimens were designed with steel lightweight aggregate concrete column and lightweight aggregate concrete beam in order to study the anti-seismic properties. Such influence factors as steel shape, stirrup ratio and axial compression ratio were considered and the bond-slip constitutive relationship was introduced in the nonlinear finite element analysis. Nonlinear finite element analysis was carried out about the hysteresis curves, skeleton curves of the specimens and equivalent viscous damping coefficient, thus, the steel shape, stirrup ratio and axial compression ratio influence laws on seismic behavior of the joints were obtained. Calculation results show that the designed joints have good seismic performance; increasing the stirrup ratio, using cross steel shape can improve the ductility and seismic energy dissipation capacity of the joints; increasing the axial compression ratio can improve the bearing capacity of the joints, but declines the ductility and energy dissipation capacity.更多还原