钢管混凝土柱是由钢管和混凝土组合在一起所形成的构件，它能充分发挥两种材料的优点，利用钢管对混凝土的约束效应，提高了核心混凝土的承载能力，而核心混凝土的存在使钢管不产生局部屈曲。在工程实践中，钢管混凝土柱与钢梁体系具有广泛的应用范围和良好的综合性能。但是钢管混凝土柱与梁的连接还存在着诸多问题，特别是钢管混凝土柱与梁连接的节点受力性能还需进一步研究。 本文利用ANSYS对钢管混凝土结构内加强环式节点采用实体建模方法进行了有限元数值模拟计算。考虑内加强环的宽度、内加强环厚度、轴压比n(n=N/fbh)和钢管壁的厚度对内加强环节点受力性能的影响，建立了12个有限元模型试件，根据有限元计算结果，对结构在循环荷载下的的滞回性能、钢管和内加强环的应力、内加强环节点的破坏机理等进行了系统分析。研究结果表明：在循环荷载作用下，结构的滞回曲线饱满，呈纺锤形，没有明显的刚度退化和捏缩现象，表现出良好的耗能能力；当加强环板宽度在(1/16~1/10)D范围内取值时，内加强环式节点性能最能有效的发挥；随着内加强环厚度的增大，节点区承载力明显提高，取加强环的厚度与梁翼缘厚度相同时，加强环受力较好，并且经济；随着钢管混凝土柱柱端轴压力的增大，节点的承载力有所提高，轴压比在0.4~0.8范围时，在极限状态下，内加强环的应力均未超过屈服应力具有一定的安全储备；随着钢管壁厚的增加，梁柱连接处的刚度变大，节点的承载力提高，但是结构的延性大幅降低，因此含钢率(a)应控制在0.052~0.074为宜；在循环荷载作用下，内加强环连接节点区，首先在梁根部翼缘与柱连接处产生屈服，翼缘压曲，在梁端形成塑性铰，随后梁腹板失稳，结构破坏。

The concrete-filled steel tubular column possesses advantages over either pure steel or concrete columns. As a kind of composite structure, the steel tube can provide effective confinement to the core concrete, at the same time the core concrete can prevent the steel tube form buckling. Concrete-filled steel tubular column with steel beam has been widely used in high buildings for its favorable integration performance. But the CFST column connected beam have a lot of questions, need to study deeply. Grounded on the theoretical analysis, we make use of ANSYS to conduct the finite element analysis of the enforced inner loop joint with solid modeling. We establish twelve F.E.models , for considering the behavior influence of the enforced inner loop joint by becoming width of enforced loop plane, thickness of enforced loop plane, axial compression ratio and thickness of steel tubular. We analyse the hysteretic performance of structure, stress of steel and enforced inner loop plane, the destruction mechanism of enforced inner loop joint by finite element calculation results. The analytical result is: the hysteretic curve of Enforced inner Loop Joint is full and spindle in cyclic loading. Structure have not obviously stiffness degradation and Knead shrinkage phenomenon, structure have well energy dissipation capacity. Width of enforced loop joint in (1/16~1/10)D will be the most effective. With thickness of enforced loop plane increased, the bearing capacity of joint has been improved obvious，So the thickness of enforced loop plane is important factors that affect bearing capacity of joint. When the enforced loop plane after a certain range, ductility of structures has reduce greatly, This is disadvantage to developing of the plastic hinge and resist earthquake. With concrete-filled steel tubular (CFST) column in the end of the pressure increases the bearing capacity of joint has been improved obviously, axial compression ratio in (0.4≤n≤0.8), stress in Enforced inner Loop haven’t exceeded yield stress in LIMIT STATES, With the thickness of steel tubular, stiffness in the connecting place of the beam and the column of the CFST column have been improved , the bearing capacity of joint also is improved, but ductility of structures has markedly dropped, so steel ratio should control in (0.052≤a≤0.074). In cyclic loading, the area of enforced inner loop joint, the end flange of beam first achieve to yield, buckling and forming plastic hinge, then structure produce damage.