【作者】 蓝声宁；

【导师】 闫月梅；

【作者基本信息】 西安科技大学 ， 结构工程， 2004， 硕士

【摘要】 型钢混凝土结构将是今后高层建筑应用的主要结构形式之一，然而目前对于这种结构的研究还不完善。为了对型钢混凝土节点受力性能有更好的了解，有必要对其进行非线性有限元分析。本文应用有限元分析软件ANSYS对钢梁—型钢混凝土柱节点在低周反复荷载作用下进行模拟。本文采用分离式有限元模型，型钢和钢筋混凝土分别选用不同的单元，钢筋混凝土部分采用整体式模型，将钢筋弥散到混凝土中，忽略了型钢混凝土节点核心区各构件间的粘结滑移性能，用非线性有限元方法分析了节点的受力性能。根据有限元计算结果，对型钢和混凝土的应力应变进行分析，得到了节点的三种失效模式：梁铰型、混合型和节点核心区剪切型。然后分析了节点的滞回特性，并与纯钢结点作比较。通过计算结果表明：对于失效模式为梁铰型的节点，型钢和钢筋混凝土分别选用不同的单元，钢筋混凝土部分采用整体式模型，能够节省计算时间，同时又能满足计算精度要求；对于失效模式为节点核心区剪切型的节点，则计算结果产生一定的误差。 在此基础上，对失效模式为核心区剪切型节点的影响参数做了的分析。分析表明：轴压比对节点的开裂荷载和极限荷载的提高是有利的，而且随之增大而提高，然而轴压比的增大不但增强了效应，而且导致了节点刚度的退化，因此轴压比应该受到限制；节点抗剪承载力随着型钢腹板厚度的增大而提高；混凝土强度对节点的开裂荷载和极限荷载的影响也比较明显，随着混凝土强度的提高而提高。最后探讨了节点抗剪承载力计算公式。更多还原

【Abstract】 Steel reinforced concrete structure will be one of main structures used in high buildings in the future, But the research on properties of this structure isn’t sophisticated. In order to develop a more thorough understanding of the behavior of SRC beam-column joints，the study on nonlinear finite element analysis is very necessary. In this paper, the SRC column and steel beam joints are analyzed by the ANSYS nonlinear finite element software under low reversed cyclic loading. Separate-finite element model is adopted in this letter. Different element types are used in the models. Integral-finite element model is adopted in reinforced concrete and steel bars are diffused in concrete. Bond-slip behavior is not taken into account between all components on the core of the SRC joints. The behavior of joints is analyzed by nonlinear finite element method. According to result of calculation, three failure types are obtained by analyzing the stress and strain of shaped steels, that is beam failure type, mixed failure type and shear failure type. After that the hysteresis loops are analyzed, which are compared with steel joints. The result showed the finite element models can economize time of calculation and satisfy request of calculation accuracy for the joints of beam failure type. However, it showed the models can produce a little error for the joints of shear failure type. On the basis of these, An analysis is developed for influence parameters that have some influence on joints’ behavior. The results show that axial ratio has a good effect on crack loading and ultimate loading. That the higher axial ratio is, the higher crack loading and utmost loading is. However increment of axial ratio can enhance force-displacement effect and degenerate stiffness of joints, so axial ratio must be limited. The shear-resistant capacity of SRC column and steel beam joint is improved with increase of the thickness steel web of column. Concrete strength grade has a good and visible effect on crack loading and ultimate loading. That the higher Concrete strength grade is, the higher crack loading and ultimate loading is. Lastly, an equation to calculate ultimate shear-resistant capacity of SRC column <WP=4>and steel beam joint is discussed.更多还原