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现行钢结构规范虽然提供了钢管结构相贯节点的验算方法,但并未考虑弯矩对节点承载能力的不利影响。而实际工程中,偏心相贯节点以及部分特定结构的相贯节点,可能承受不可忽略的弯矩作用,若仍按规范方法验算,则可能造成安全隐患。结合实际工程,利用通用有限元分析程序ANSYS,对方钢管偏心相贯节点进行有限元分析,验算弯矩和轴力共同作用下节点的承载能力,对不满足要求的节点提出2种补强措施,并验算补强后的节点强度,为实际工程设计提供参考。
Although the current code of steel structure provides the checking method for the joints of steel pipe structure, it does not consider the adverse effect of bending moment on the bearing capacity of the node. In practical engineering, the intersection of the node of eccentricity and some specific structures may bear the bending moment which can not be neglected. If it is still calculated according to the standard method, it may cause potential safety hazard. Combined with the actual project, the common finite element analysis program ANSYS was used to carry out the finite element analysis of the eccentric steel tubular cross-section joints to check the bearing capacity of the joint under the joint action of bending moment and axial force. Two kinds of reinforcement measures were proposed for the nodes that did not meet the requirements. And check the strength of the node after reinforcement for the actual engineering design to provide a reference.