某航站楼钢屋盖复杂节点有限元分析

Finite Element Analysis of Complex Joints of Steel Roof of A Terminal Building

节点设计是空间钢结构设计的重要环节.某国际机场航站楼的钢结构屋盖为空间方管桁架体系,节点构造较为复杂,现有规范并未给出相关的承载力计算方法,为验证节点的安全性,采用ABAQUS有限元软件对关键节点进行力学性能分析,并在分析过程中考虑几何非线性和材料非线性的影响.有限元分析结果表明,本工程的节点在检验荷载作用下,节点承载力总体满足设计要求;对于承载力不满足设计要求的节点,合理设置加劲板可以有效缓解节点区的应力集中,增大节点安全储备.

Design of joints is an important process in steel truss structure analysis.The steel roof of an international airport terminal building is a spatial square tube truss system,and the joints are key parts of the truss structure.The strength and stiffness of the joints directly determine the mechanical properties of the truss system.The key joints of steel roof cover of an international airport terminal building were numerically analyzed by finite element software ABAQUS that takes into consideration geometrical nonlinearity and material nonlinearity.Finite element analysis results show that the bearing capacity of the joints under test loads generally meets the design requirements.For the joints whose bearing capacity does not meet the design requirements,the reasonable setting of stiffening plate can effectively relieve the stress concentration and raise the safety factor of the joint.