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采用有限元分析方法研究平面管桁架,分析其分别在跨中和节点受静载时变形发展的全过程,确定管桁架的破坏模式;对管桁架相贯点最不利应力发展过程进行分析,确定相贯点应力发展次序.分析结果表明:管桁架在跨中受静载时,变形主要以受荷处局部变形和受荷节间整体变形为主;节点受静载时,变形主要以受荷处局部变形为主,整体变形较小.
The finite element analysis method is used to study the whole process of the deformation of the flat tube truss under static load. The failure modes of the tube truss are determined. The most unfavorable stress development process of the tube truss is analyzed, The results show that when the pipe truss is subjected to static load in the span, the deformation is mainly dominated by the local deformation of the load-bearing part and the overall deformation of the load-bearing internode. When the node is subjected to static load, the deformation mainly depends on the load Local deformation at the main deformation of the smaller.