肋环人字型索穹顶受力特性及其预应力态的分析法

发布时间：2018-11-28 11:49

【摘要】：提出一种肋环人字型索穹顶,其形体构造设有两根人字型撑杆,改变了现有符合Fuller思想的张拉整体类索穹顶,如肋环型、葵花型、Kiewitt型、鸟巢型索穹顶只设单根撑杆即竖杆的特点。肋环人字型索穹顶上、下弦节点的索杆数均为6,与最常见的上下弦节点数为4的肋环型索穹顶相比,可改善结构的稳定性;上下弦节点错位布置,便于铺设环向折线形膜面。针对肋环人字型索穹顶提出确定预应力态的分析计算方法,该法从节点平衡方程入手,推导了不设和设有内孔的索穹顶预应力索杆内力的通用计算式。对不设和设有内孔两种形式特定参数的索穹顶给出了内力计算用表和算例分析。结果表明,结构预应力态杆件内力由内圈至外圈逐步增大,随结构矢跨比增大肋环人字型索穹顶的杆件内力减小。计算结果可供工程设计参考。
[Abstract]:This paper presents a kind of rib ring herringbone cable dome, which has two herringbone braces, which changes the existing tensioning integral cable dome, such as rib ring type, sunflower type, Kiewitt type, which accord with the idea of Fuller. The bird's nest cable dome has the characteristics of a single bracing rod or a vertical rod. The number of cable rods at the lower chord nodes on the manglyph cable dome of the rib ring is 6, which can improve the stability of the structure compared with the most common rib ring cable dome with 4 upper and lower chord nodes, and the upper and lower chord joints are dislocated, which is convenient to lay the circumferential folded linear membrane surface. Based on the equilibrium equation of the node, the general calculation formula of the internal force of the prestressed cable rod of the cable dome without or with internal holes is derived. The method is based on the analysis and calculation method of determining the prestress state of the rib ring manglyph cable dome. A table and an example for calculating the internal force of cable dome without or with two types of internal holes are given. The results show that the internal force of prestressed member increases gradually from inner circle to outer ring, and decreases with the increase of rise-span ratio. The results can be used for reference in engineering design.
【作者单位】：浙江大学空间结构研究中心;
【分类号】：TU399

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