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按照刚性脊索穹顶结构的思路,将常规肋环型索穹顶中的脊索替换为三铰拉梁,提出了一种三铰拉梁式肋环型索穹顶结构。制作了1个直径为6 m的三铰拉梁式肋环型索穹顶结构模型,对其张拉成型过程和不同静力荷载作用下的结构响应进行了数值模拟和试验研究。结果表明:张拉成型过程中,斜索和环索的索力逐渐增大,拉梁局部变形逐渐减小,结构整体由存在较大平面外偏移的松弛状态逐渐刚化成型;竖向荷载作用下,三铰拉梁式肋环型索穹顶整体变形较小,拉梁中铰局部变形是预应力设计和位移控制的关键;结构整体为柔性空间体系,对非对称荷载作用较为敏感;卸载后,结构可以恢复初始的形状与内力,呈现弹性特征。有限元模型可以较好地模拟结构在张拉成型和加载过程中的位形和受力规律,可用于三铰拉梁式肋环型索穹顶结构的受力性能分析。
According to the idea of rigid chord dome structure, the chord of conventional rib ring cable dome is replaced by three-hinged beam, and a three-hinged beam-type rib ring cable dome structure is proposed. A three-hinged beam-ribbed cable dome with a diameter of 6 m was fabricated. The numerical simulation and experimental study on the structural response of the three-hinged beam-arch ribbed cable dome under tension and compression processes and different static loads were carried out. The results show that during the tensioning process, the cable forces of the oblique cable and the ring cable gradually increase, and the local deformation of the tension beam decreases gradually. The whole structure is gradually rigidified by the relaxation state with the large out-of-plane displacement. The vertical load The whole deformation of the middle hinge is the key to the prestress design and displacement control. The whole structure is a flexible space system, which is sensitive to the asymmetric load. After unloading, Structure can restore the initial shape and internal force, showing the elastic characteristics. The finite element model can well simulate the configuration and stress law of the structure during tensioning and loading, and can be used to analyze the mechanical behavior of the three-hinged beam-type ribbed cable dome.