体育场月牙形大跨悬挑屋盖风荷载特性

Wind load on the crescent-shaped long-span cantilevered roof in stadium

风荷载是大跨悬挑屋盖的主要控制性载荷,本文以灵武体育中心为例,采用同步测压风洞试验技术,对体育场中最常采用的双侧布置的月牙形大跨悬挑屋盖平均风压、脉动风压、极值风压分布进行了研究,为该类结构的抗风设计提供参考.试验结果表明:不同风向角下,由于月牙形悬挑屋盖倾角的变化,来流在屋盖表面形成不同的特征湍流;对于屋盖整体而言,平均风荷载、脉动风荷载随风向角变化均匀,处于来流下游的悬挑屋盖平均风荷载、脉动风荷载均较处于来流上游的悬挑屋盖大.悬挑屋盖上表面极值风压数值普遍大于下表面,且变化更为剧烈.

Wind load is the main control High-frequency-pressure-integration wind load of the crescent-shaped long-span cantilevered roof. In this paper, tunnel testing was carried out to investigate the mean, the fluctuating and the extreme wind load distributions on the crescent-shaped cantilevered roofs located on opposite sides, utilizing the Lingwu Sports Center as an example. The purpose of this sign of the same types of structures. The test results show paper was to offer a reference for wind force proofing de- that： different characteristic turbulence was formed on the roof surface in different wind directions due to the changes of the roof inclination. For the whole roof, the mean wind load and fluctuating wind load change evenly with the wind direction, and the values of the mean wind load and fluctuating wind load of the roof on the downstream of the oncoming flow were bigger than that of the roof on the upstream of the oncoming flow. The extreme wind load on the upper surface of the roof is generally bigger than that on the lower surface and changes more violently.