复合张弦结构整体提升及张拉分析施工关键技术研究
Research on Key Construction Technologies for Integral Lifting and Tensioning Analysis of Hybrid String Structures
萍乡奥体中心体育馆钢结构屋盖采用了弦支穹顶与张弦梁复合结构体系。该结构形式复杂、施工场地受限,施工方案的选择直接影响场馆的施工质量与造价。文中结合有限元分析结果,从安全性、经济性、施工可行性的角度出发,对比弦支穹顶结构采用分块吊装与局部整体提升两类施工方案,并对两种张弦结构的施工张拉顺序进行对比分析。结果表明:弦支穹顶结构采用局部整体提升工艺,其综合经济性与成型质量更优;提升阶段对结构下部拉索施加一定的预拉力,可有效改善结构刚度不足引发的不均匀变形问题;复合张弦结构需先完成全部钢结构安装后方可开展张拉作业,该工程选择优先张拉张弦梁、后张拉弦支穹顶的工序,对结构受力与工期管控更有利。同时也总结了该工程累积提升、分级张拉、全过程施工监测等核心施工技术,整套施工流程安全可控、方案合理可行,可为同类复合张弦结构工程提供施工思路与实践参考。
The steel roof of the Pingxiang Olympic Sports Center gymnasium adopts a hybrid design of a suspen-dome and a beam string structure. Due to the complex structural design and limited site construction conditions, the selection of construction scheme for the gymnasium is of great significance for construction quality and cost. Combined with the finite element analysis results, a scheme comparison was made between sectional hoisting and partial integral lifting of the suspen-dome from the perspectives of safety, economy, and construction feasibility, and the construction tensioning sequences of the two string structures were analyzed. The results indicate that the partial integral lifting for the suspen-dome has better cost-effectiveness and quality reliability. At the same time, applying a certain level of pretension to the lower cables of the structure can mitigate uneven deformation caused by insufficient structural stiffness during the lifting process. For the hybrid string structure, the installation of steel structure must be completed before tensioning. In this project, tensioning the beam string structure prior to the suspen-dome is more advantageous for the structural stress and construction schedule. This article also summarizes other key construction technologies in this project, including cumulative lifting, graded tensioning and monitoring of the construction process. The construction process is safe and controllable, and the scheme is reasonable and effective, which can provide solutions and construction experience for similar structural buildings in the future.
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