钢管混凝土叠合柱—混凝土梁节点滞回性能的有限元分析
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摘要
本文在考虑反复荷载作用下混凝土材料的刚度损伤和恢复,以及钢材的包辛格效应的基础上建立了钢管混凝土叠合柱—钢筋混凝土梁节点在柱端恒定轴压力和梁端往复侧向力共同作用下的有限元分析模型。有限元模型考虑了几何非线性和材料非线性的影响,并合理考虑了节点核心区各组件之间的接触作用。采用有限元模型模拟了4榀组合节点试件的滞回试验,计算的破坏模态和荷载—位移滞回曲线均和试验结果吻合良好。利用有限元模型对节点受荷全过程的工作机理进行了细致分析,结果可为此类组合节点的工程抗震设计提供参考和依据。
With considering the stiffness damage and recovery of concrete and Bauschinger effect of steel under cyclic loading,this paper developed a nonlinear finite element analysis(FEA) model of concrete encased concrete filled steel tube(CFST)column to concrete beam joints under constant axial load in the column and incremental laterally cyclic load at the beam ends.The interaction between different components inside the joint zone are taken into consideration in the FEA model,where both material and geometric nonlinear are included as well.The predicted results generally agree well with the test results,in terms of failure mode and load versus displacement hysteretic curves.Then the behaviour analysis of the composite joint were conducted by using the FEA model,and the analytical results of this paper could provide basis and reference to the seismic design of this type of composite joints in practical engineering.
引文
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