自复位预制预应力混凝土框架梁柱节点抗震性能分析

Analysis for seismic behavior of self-centering precast prestressed concrete frame beam-column joints

为获得抗震性能与工作性能更优异的预制混凝土框架梁柱节点,本研究提出了一种自复位预制预应力混凝土框架梁柱节点,并运用有限元软件分析了预应力筋张拉应力、柱轴压比、混凝土强度等因素对节点在低周往复荷载下的骨架曲线、延性系数、刚度退化、滞回曲线、耗能能力等抗震性能的影响。结果表明:本研究提出的自复位预制预应力混凝土框架梁柱节点具有较好的耗能性能;提高预应力筋的张拉应力可以提高节点抗震性能;在一定范围内提高柱的轴压比可以提高节点抗震性能,但超过一定范围后则影响不显著;混凝土强度对节点抗震性能的影响较不明显。总体来说,该节点形式具有良好的抗震性能,可以作为装配式框架结构梁柱节点的一种有效选择。

In order to obtain precast concrete frame beam-column joint with better seismic performance and work performance,a kind of self-centering precast prestressed concrete frame beam-column joints is proposed.The effects of stretching control stress,axial compression ratio of the column and concrete strength on the skeleton curve,ductility coefficient,stiffness degradation,hysteretic curve and energy dissipation capacity of joints under low cycle load are analyzed by the finite element software.The results show that selfcentering precast prestressed concrete frame beam-column joints have better energy dissipation capacity;Increasing the tensile stress of the prestressed reinforcement can improve the seismic behavior of joints;improving the axial compression ratio of the column in a certain range can improve the seismic behavior of joints,but the effect is not obvious beyond a certain range;the influence of concrete strength on seismic behavior of joints is not obvious.On the whole,the joint form has excellent seismic behavior and can be used as an effective choice for beam-column joint of assembly frame structure.