矩形平面索穹顶结构的模型试验研究

Model experimental research on rectangular cable dome

为了了解矩形平面Geiger型索穹顶结构的受力性能,设计并加工了一长边4.7m、短边3.4m的矩形平面索穹顶结构试验模型,并对该结构试验模型的预应力、自振频率及多种荷载工况下的多级静力加载等内容进行了理论分析和试验研究。研究结果表明:矩形平面Geiger型索穹顶结构与圆形平面Geiger型索穹顶结构具有相似的静力性能,它在满跨均布荷载作用下具有良好的受力性能,但不利于承受半跨均布荷载。且结构第一阶自振频率较低,自振频率随初始预应力的增大而增大,提高结构预应力水平可以改善结构刚度。

In order to understand the mechanics properties of rectangular cable domes, a rectangular cable dome model with the size of 4.7 m × 3.4m is designed and fabricated. Then experiments on the model are conducted, including the prestress applying, measuring of the natural frequencies and loading experiments of several conditions. The experimental results match well with the analytical results, which indicates that the rectangular cable dome has the same static property as the circular cable dome. Moreover, it has good force bearing capacity under full-span load, but not ideal for bearing half-span load. Besides, the structure＇s natural frequency is low and increases with its initial prestress, so the stiffness of the structure can be improved by increasing its initial prestress.