大跨度空间结构施工过程力学行为的研究

传统的结构设计一般只考虑结构在建成后运营期间受力状态是否满足要求,而未考虑施工过程中结构的受力特性,但施工状态与设计状态下的结构有很大差异。为了解决这一问题,应用非线性时变有限元方法来考虑施工过程中结构的时变效应,通过对一算例进行施工过程分析,全过程跟踪分析各施工阶段的力学性状,得出施工过程杆件内力和节点位移的演变规律,得出不考虑施工过程的时变效应对结构设计偏于不安全的结论,最后为大跨度结构的设计和施工提出指导性的建议。

Mechanical Behaviors of Large Span Space Structures in the Construction Process

Traditional structural design emphasizes checking whether a loaded structure satisfies design requirements without considering the construction process.There is a great difference in structures between the states in construction processes and design,however.To solve the above problems,a method of nonlinear time- varying mechanics was adopted to analyze the construction process of a structure.The structural characteristics in each construction stage were analyzed by time-varying mechanics and the variations of internal force and displacements obtained.We conclude that designs will not be safe if the time varying effect in the construction process analysis is not considered.We offer advice on the design and construction of large-span structures.