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为了研究钢管混凝土框架梁柱半刚性连接的抗火性能,利用ABAQUS软件进行了火灾作用下钢管混凝土柱与钢梁外伸端板连接节点的热力耦合性能的数值模拟。确定了高温下钢材和核心混凝土的材料本构关系模型,建立了考虑楼板影响的钢管混凝土框架外伸端板连接节点的有限元计算模型,对三面受火和外荷载共同作用下节点的受力全过程进行了分析。详细分析了荷载比、螺栓预紧力、防火保护层厚度、材料特性、构件几何尺寸等参数对节点耐火极限的影响。结果表明,荷载比、螺栓预紧力、防火保护层厚度和钢梁截面高度对组合节点耐火极限的影响较显著。该研究结果将为火灾下半刚性钢管混凝土框架的设计理论提供科学依据。
In order to study the fire resistance of semi-rigid connections of CFST beams and girders, the numerical simulation of thermo-mechanical coupling of concrete-filled steel tubular columns with outrigger end plates under fire by ABAQUS software was carried out. The constitutive model of material between steel and core concrete at high temperature was established. The finite element model was established for the connection of overhanging end plate of CFST frame considering the effect of slab. The stress on the joint under the joint action of fire and external load on three sides The whole process was analyzed. The effects of load ratio, bolt pretightening force, thickness of fire protection layer, material properties and component geometry on the fire resistance of joints were analyzed in detail. The results show that the load ratio, bolt pretightening force, the thickness of fire protection layer and the height of the section of steel beam have a significant impact on the fire resistance of the combined joints. The results of this study will provide a scientific basis for the design theory of semi-rigid CFST frames under fire.