弦支穹顶结构模型张拉成型试验研究

弦支穹顶结构是由上部单层网壳和下部索杆弦支系统组成的大跨预应力杂交结构.本文以一实际弦支穹顶工程为背景,制作了跨度为8m的缩尺模型,并进行了两种张拉成型方案试验.试验结果与施工模拟理论分析结果基本一致,表明模型设计和试验方法合理,理论分析采用的施工张拉模拟法可靠.考虑到环索节点存在较大摩擦力,本文认为施工工程张拉成形时采用斜索张拉法优于环索张拉法.

Experimental research on tension process of suspen-dome structural model

Suspen-dome is a kind of large-span prestressed hybrid structure, consisting of an upper singlelayer lattice shell and a lower cable-strut system. To simulate the construction process of suspen-dome, a scaled model structure with a span of 8m was made first. And the construction process with two tensioning schemes were then studied. The comparison between the theoretic value and the experimental value verified the model design and experiment methods were reasonable and the construction simulation method was reliable. Considering the relatively large frictions at the node of the hoop cable and strut, it is better to tension diagonal cable than tension cable hoop in the real project.