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为了获悉高温对方钢管柱与钢梁外伸端板连接弯矩-转角关系特性和破坏机理的影响,该文利用ABAQUS有限元程序建立了高温下方钢管框架外伸端板连接节点的有限元理论模型,进行高温下节点非线性全过程受力分析。研究了不同温度下端板宽度﹑柱轴压比﹑螺栓直径等参数对连接弯矩-转角关系的影响规律。研究表明:端板宽度﹑柱轴压比、螺栓直径﹑钢材强度和钢管厚度对高温下节点抗弯承载力影响较大;端板宽度﹑螺栓直径﹑钢材强度和钢管厚度对高温下节点初始刚度影响较大;此类节点在常温下抗弯承载力和初始刚度较高,破坏区仅在钢梁受压翼缘;随着温度增大,节点抗弯承载力和初始刚度逐渐降低,破坏区扩大到节点区域;当温度超过500℃时,破坏区由节点区域发展到钢管柱。
In order to know the relationship between the moment-rotation angle and the failure mechanism of the steel tube column and the steel beam extension end plate, a finite element model of the connecting node of the steel pipe frame overhanging end plate under high temperature was established by ABAQUS finite element program , Under high temperature non-linear stress analysis of the whole process. The influences of end plate width, axial compression ratio, bolt diameter and other parameters on the connection moment-rotation angle under different temperatures were studied. The results show that the width of the end plate, the axial pressure ratio of the column, the diameter of the bolt, the strength of the steel and the thickness of the steel pipe greatly influence the flexural strength of the joints under high temperature. The width of the end plate, the diameter of the bolt, the strength of the steel and the thickness of the steel tube, The bending moment and the initial stiffness of these joints are higher at room temperature, and the failure zone is only on the flange of the steel beam. As the temperature increases, the flexural capacity and initial stiffness of the joints decrease gradually, Expanding to the node area; when the temperature exceeds 500 ℃, the destruction of the area from the node area to the steel column.