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弦支穹顶是一种典型的由索、杆、梁单元组成的空间结构,可充分发挥预应力技术的优势来提高单层网壳的刚度和承载能力.近年来已有较多的研究和工程应用,如用于体育建筑、会展建筑等,但其建筑平面多为与穹顶球面(椭球面)网壳相应的圆形平面(椭圆形平面),比较单一,影响了推广应用范围.本文提出一种由上部单层柱面网壳和下部弦支体系组合而成矩形平面的弦支柱面网壳,对其结构型体进行了研究.根据单层柱面网壳网格类型和弦支形式提出了n环弦支单向斜杆正交正放网格型柱面网壳、n环弦支两向正交正放网格型柱面网壳、n环弦支联方网格型柱面网壳、n环弦支三向网格型柱面网壳等四种弦支柱面网壳.以单跨单波三环弦支单向斜杆正交正放网格型为例对弦支柱面网壳的受力特性进行了深入研究,探讨了预应力水平、杆件截面、矢跨比等参数变化对弦支柱面网壳内力和变位的影响,并对其特征值屈曲、非线性屈曲和基本模态进行了分析.分析研究结果表明,矩形平面的弦支柱面网壳是一种技术经济指标优越、有推广应用前景的新型空间结构.
Suspension dome is a typical space structure composed of cable, rod and beam units, which can make full use of the advantages of prestressing technology to improve the stiffness and bearing capacity of single-layer reticulated shell. In recent years, more studies and engineering Applications, such as sports buildings, convention and exhibition buildings, etc., but the construction of the plane mostly with the dome (ellipsoid) reticular shell corresponding to the circular plane (elliptical plane), a relatively simple, affecting the promotion of the application of this paper presents a This paper researches on the structure of a chord-supported reticulated shell with a rectangular plane composed of an upper monolayer reticular shell and a lower chordal support system.According to the single-layer cylindrical reticulated shell lattice type and chord form, n-ring chord single-dipole orthogonal orthogonally-grid reticulated shell, n-ring chord support two-way orthogonal orthogonally-grid reticulated shell, n-ring chord parallel grid mesh Shell and n-ring sill claw three-way grid-type cylindrical reticulated shell.Using the orthogonal orthogonality grid of single-span single-wave tricyclic chordal supporting beam as an example, The reticulated shell’s stress characteristics have been deeply studied. The influences of prestressing force, rod section, The results show that the reticulated shell with rectangular plane is a kind of technology with superior technical and economic indexes, A new type of space structure that has the prospect of popularization and application.