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常州市体育馆弦支穹顶,采用Levy型索杆体系以及外部联方型和内部凯威特型网格单层网壳。与常规已研究的弦支穹顶相比,其高矢跨比使网壳具有较大刚度,其椭圆抛物面外形使屋盖在水平风载作用下既存在风吸区也存在风压区。结合工程进行了高矢跨比椭圆抛物面弦支穹顶的风振时域分析,研究了网壳和索杆系的风振响应,在风振作用下,拉索索力和支座竖向反力减小,但拉索未松弛,风载未超过恒载;索杆系应力的均值和波动范围较小;网壳的纵轴和横轴上的响应变化规律较为一致,最大竖向位移出现在靠近中心的2~4环;网壳内环的竖向位移风振系数比较均匀,外环波动较大。通过统计风振响应参数,探讨了整体风振系数的计算方法。基于响应均值和最大值的线性关系,采用风振响应与平均风静力响应的最大值之比作为适用于风载静力分析的整体风振系数,并提出不同风向下的建议值。方法简便,无需判定奇点和统计各样本响应时程。风振响应分析结论及整体风振系数计算方法和结果,可为类似结构的抗风设计提供参考。
Changzhou Gymnasium Slingshot dome, using Levy rod system and the external joint type and internal Kaiweite grid single-layer reticulated shell. Compared with the conventional chordal dome, the high sagittal ratio makes the reticulated shell more rigid. The elliptical parabolic shape makes the roof have both wind-suction zone and wind-pressure zone under horizontal wind load. Wind-induced vibration analysis of high-span-to-elliptical paraboloid chordal dome was carried out in combination with engineering work. The wind-induced vibration responses of reticulated shell and cable ties were studied. Under wind vibration, But the cable did not loosen and the wind load did not exceed the dead load. The mean value and fluctuation range of stress in the cable rod system was small. The response regularities on the longitudinal and horizontal axes of the reticulated shell were consistent, and the maximum vertical displacement appeared close to Center of the 2 ~ 4 ring; reticular shell inner ring vertical displacement wind vibration coefficient is relatively uniform, the outer ring fluctuations. Through the statistical wind-induced response parameters, the calculation method of the overall wind-induced vibration coefficient is discussed. Based on the linear relationship between the mean value and the maximum value, the ratio of the wind-induced response to the maximum of the average wind-induced response is adopted as the overall wind-induced vibration coefficient suitable for wind-load static analysis and proposed values under different wind directions are proposed. The method is simple, no need to judge the singularities and statistical sample response time. Wind-induced vibration response analysis and the overall wind-induced vibration coefficient calculation method and results for similar structures provide a reference for the wind-resistant design.