弦支穹顶结构研究进展与工程实践

Research Progress and Engineering Practice on Suspen-Dome Structure

弦支穹顶结构是基于张拉整体概念并综合了单层网壳和索穹顶结构的优点后发展起来的一种预应力大跨度网格结构体系。本文在分析弦支穹顶提出的背景和力学原理的基础上,论述了国内外对弦支穹顶结构形态分析、优化设计、静动力性能、施工控制理论及其试验研究等方面的研究进展,总结了弦支穹顶相关的研究内容和研究结论。结合国内外近20项实际工程的应用,对弦支穹顶的跨度、上部网壳结构形式、下部张拉整体部分的布置、预应力施加方式、撑杆上节点和撑杆下节点等结构特性进行了分析总结,针对目前常用的预应力设计方法、节点构造、预应力张拉方案,提出了供工程应用参考的建议。指出了温度效应研究、考虑索撑节点滑移摩擦的动力反应分析、索力的测试及其补偿技术、超大跨度弦支穹顶设计理论等5项亟待解决的弦支穹顶关键课题。

Suspen-dome structure is a new type of pre-stressed long span spatial structure. It integrates the advantages of cable dome and single-layer latticed shell based on the tensegrity system concept. In this paper, Based on the analysis of background and mechanical principle, research states of suspen-dome, such as form-finding analysis, optimization design, static and dynamic behaviors, construction control theory and so on, arc reviewed, and the characteristics of all research methods are also analyzed. some main information of all suspen-domc projects are summarized such as span, type of upper dome, type of bottom tensegrity systems, prestressing method, upper joint of strut, bottom joint of strut and so on. Five key problems needed to solve are presented in this paper, such as dynamic analysis considering the friction between cable and joints, temperature effects, testing and compensation technique of cable force, design theory of long sIJan suspen dome and so on.