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微波天线塔台由中心筒体和6层与筒体相连的悬挑环板组成,设置在大楼21层顶上。简体高35m,底部直径4.1m,环板最大悬挑跨度5.8m,荷载为5kN/m ̄2。为了增加筒体和板的刚度,提高板的抗裂度,在筒体纵向,环板的径向和环向均设置了预应力筋。为验证设计计算方法和预应力效果,进行了1/2比例的模型试验。试验表明,结构主要部位的计算应力和变形与试验值符合较好,采用预应力方法增强结构刚度和抗裂度是有效的。
The microwave antenna tower is composed of a central cylinder and six cantilevered ring plates connected to the cylinder and is placed on top of the 21st floor of the building. Simplified high 35m, the bottom diameter of 4.1m, the maximum cantilever span ring ring 5.8m, load 5kN/m ~ 2. In order to increase the rigidity of the cylinder and the plate and improve the crack resistance of the plate, prestressed tendons are set in the longitudinal direction of the cylinder in the radial direction and the circumferential direction of the ring plate. To verify the design calculation method and prestress effect, a 1/2 scale model test was performed. The test shows that the calculated stress and deformation of the main parts of the structure are in good agreement with the test values. It is effective to use the prestress method to enhance the structural rigidity and crack resistance.