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提出了一种由索穹顶与单层网壳组合的空间结构形式,该结构不仅充分利用了索穹顶的受力特性,而且发挥了单层网壳便于铺设刚性屋面板的优势。给出了葵花型、肋环型、Kiewitt型、鸟巢型4种索穹顶结构与相应网格布置的单层网壳的组合结构形式,结构顶部可采用封闭和开口两种形式。定义了索穹顶与单层网壳之间连接杆的荷载传递系数、索穹顶和单层网壳的支座竖向反力分配系数。以葵花型索穹顶与单层网壳的组合结构为例,探讨了结构在均布荷载和集中荷载作用下的受力性能以及结构的矢跨比、预应力水平、网壳杆件截面等参数对结构受力性能的影响。计算结果表明,外荷载越小、矢跨比越小、预应力水平越大和网壳杆件截面越小,索穹顶承担的外荷载比例越大。
A space structure combining the cable dome with the single-layer reticulated shell is proposed. The structure not only makes full use of the stress characteristics of the cable dome, but also has the advantage of single-layer reticulated shell to facilitate the installation of rigid roofing panels. The combined structure of four types of domes with sunken, ribbed, Kiewitt and bird nest types and single-layer reticulated shells with corresponding grids is presented. The top of the structure can be closed and open. The load transfer coefficient of the connecting rod between cable dome and single-layer reticulated shell and the vertical reaction force distribution coefficient of the cable dome and single-layer reticulated shell are defined. Taking the composite structure of sunflower dome and single-layer reticulated shell as an example, the mechanical properties of the structure under uniform and concentrated loads, as well as the parameters of the span-span ratio, prestressing force, Impact on the mechanical behavior of the structure. The calculation results show that the smaller the external load, the smaller the ratio of sag and span, the larger the prestressing force and the smaller the cross section of the shell member, the greater the external load of the cable dome.