复式钢管混凝土外环板节点抗震性能有限元分析

Finite element analysis of seismic behaviors of external stiffening ring joint between composite concrete-filled steel tubular column and steel beam

为了研究复式钢管混凝土外环板节点的抗震性能,通过有限元模拟软件ABAQUS设计并建立了加肋和不加肋两个新型复式钢管混凝土外环板节点模型。模型中为钢管和混凝土分别赋予了不同的本构关系,经过设置分析步,边界条件,加载力等过程,得到了两种节点的破坏形态、承载能力、变形特征等。分析结果表明:两个模型计算得到的滞回曲线均为纺锤形,滞回环饱满,节点破坏均为梁端塑性铰破坏,加肋试件可提高节点的承载力和延性。新型节点整体性强,满足结构设计强柱弱梁及强节点弱构件的设计原则,具有较好的抗震性能,可以应用到工程设计实践中。

In order to study the seismic behavior of the new type of connection between composite concrete-filled steel tubular column and steel beam,two models were built including the joints with and without ribs using the finite element simulation software ABAQUS. Steel and concrete were chosen to use different stress-strain relationship. Then the models were realized by the analysis steps,the boundary conditions and the loading forces. The failure modes,hysteresis curves and deformation were compared for these two models. The hysteresis curves are fusiform and the hysteresis loop is full,and both models failed as plastic hinges at beam ends. The ribbed specimen has the stronger bearing capacity and better ductility. The finite element analysis results showed that the new joints with good seismic behavior can easily achieve the anti-seismic design principle of strong column-weak beam and strong joint-weak member,and can be used as a reference for the later engineering design.