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根据内蒙古伊旗全民健身体育中心工程设计的需要,对大跨度索穹顶结构进行抗火性能分析。以温度-结构耦合为基本方法,基于大空间空气升温模型,考虑高温下材料的非线性,分析了结构在不同火灾工况下的响应,得到火灾下索穹顶结构变形、节点位移、杆件预应力损失的基本规律。研究表明:肋环型索穹顶结构侧向刚度较弱,对偏心火灾敏感,火灾下的挠度超限和侧向变形是导致结构失效和非结构构件提前破坏的主要原因;脊索尤其内脊索是火灾下预应力损失较为严重的杆件,中撑杆侧向位移控制是肋环形索穹顶结构抗火设计的重点。针对肋环形索穹顶结构侧向刚度较弱的缺点,在中撑杆上节点部位加设一道环向杆件进行结构体系的改进,可使结构的抗火性能得到较大改善。
According to the needs of engineering design of Yiqian National Fitness Center in Inner Mongolia, the fire resistance performance of long-span cable dome was analyzed. Taking temperature-structure coupling as the basic method, the response of the structure under different fire conditions is analyzed based on the large-space air temperature rise model and the material nonlinearity under high temperature. The deformation of the cable dome under fire, the displacement of the node, The basic rules of stress loss. The results show that the lateral stiffness of the ribbed cable dome is weak and sensitive to eccentric fire. The deflection and lateral deformation of the ribbed cable dome are the main causes of structural failure and premature failure of non-structural components. The notochord, especially the inner ridges, is a fire Under the prestress more serious loss of the rod, the strut in the lateral displacement control rib ring cable dome structure is the focus of fire-resistant design. Aiming at the disadvantage that the lateral stiffness of the ribbed cable dome structure is weak, a ring bar is added to the node of the middle strut bar to improve the structural system, which can greatly improve the fire resistance performance of the structure.