刚性杆弦支穹顶实物加载试验研究

An experimental study on rigid suspendome structures

介绍了弦支穹顶体系的研究与应用现状,分析了半刚性弦支穹顶结构的优缺点,以半刚性弦支穹顶的概念为基础,以天津博物馆贵宾厅屋盖为工程背景,按照二阶段设计法中第二阶段结构特性提出并设计了刚性杆弦支穹顶结构。设计了实物加载试验方案,对该刚性杆弦支穹顶进行了静载试验研究,得到了刚性杆弦支穹顶结构内力及位移随加载历程的变化规律。分析比较了试验值与理论计算值,表明刚性杆弦支穹顶具有较好的受力性能。对刚性杆弦支穹顶和结构条件相同的天津博物馆多功能厅屋盖单层网壳进行了比较分析,结果表明刚性杆弦支穹顶具有受力性能优越,用钢量少,施工方便和造价低的优点,为其在工程中的进一步推广应用奠定了基础。

State of the art for suspendome research and application is introduced, and the structural performance of suspendome is analyzed. On the basis of half-rigid suspendome, rigid suspendome is proposed according to the two-stage method. The roof of the VIP Hall of Tianjin museum is designed as a rigid suspendome. A loading test plan on the structure is designed and the experimental study is performed under static load. The structural performance, such as deformation and internal force, with loading process are obtained. By comparing the experimental results with theo- retical analyses, the rigid suspendome is proved to exhibit a better mechanical performance. The rigid suspendome is compared with a single-layer dome of same geometry, used as the roof of the multi-purpose Hall of the Tianjin museum. The results indicate that the rigid suspendome has a number of advantages, including good structural performance, less steel consumption, convenient construction and low cost.