支座边界及屋面支撑对张弦桁架结构施工过程影响分析  

Impact Analysis of Boundary Condition and Roof Braces on the Construction Process of Truss String Structures

作　　者：姜子钦[1] 何志军[2] 丁洁民[2] 

机构地区：[1]清华大学土木水利学院,北京100084 [2]同济大学建筑设计研究院,上海200092

出　　处：《结构工程师》2010年第6期99-106,共8页Structural Engineers

摘　　要：以上海世博会主题馆张弦桁架结构体系为背景,采用推广的"状态确定"的施工过程逆向分析方法对该屋盖结构进行施工过程分析,研究了支座边界条件、屋面支撑刚度及其布置方式对结构在张拉过程中结构变形和杆件内力的影响,追踪了结构几何力学体系成形过程。分析结果表明:支座边界条件改变可能使得结构处于不利状态;屋面支撑系统刚度的降低,使结构在施工过程中响应十分剧烈,布置方式的改变影响结构的变形趋势,此两者均会使得结构处于不利状态。Based on the truss string structure of Theme Pavilion for Shanghai World Expo,retrogressive analysis method was adopted to simulate the construction process of the structure.The influence of the boundary conditions and roof braces on the structural performance was analyzed,including internal force and deformation.The whole forming process was traced during construction.The results show that the boundary conditions,the stiffness and distribution of the roof braces have significant influence on the structural mechanic behavior.The change of the boundary condition and the reduction of the stiffness of the roof braces may place the structure in the adverse state.And different roof braces distribution will affect the deformation tendency.Both of this change will make the structure in the adverse state.

关 键 词：张弦桁架 支座边界 屋面支撑 施工过程 逆向分析 

分 类 号：TU391[建筑科学—结构工程]