大跨度曲面木屋盖风荷载特性的风洞试验研究

大跨度曲面屋盖风荷载特性复杂,大规模木屋盖工程在实际工程应用中相对少见。通过对海口市民游客中心这个大跨度曲面木屋盖工程的风洞试验研究,系统地分析了在不同风向角下曲面木屋盖风荷载的平均压力系数分布规律、等效静风荷载分布规律和整体风荷载效应的分布规律。试验研究结果表明:屋面整体风荷载效应主要表现为上吸作用;屋盖内外表面的平均风压系数主要受风向角和测点位置的影响,表现出复杂的波动性规律,部分重要测点处存在多个平均风压系数极值和主风向角工况。在整体设计计算过程中,除了需要考虑最大上吸工况外,也要考虑下压风工况的不利作用;在局部设计计算中,应重点考虑出现极值的重点区域和特异点。

Wind tunnel test study on wind load characteristics of large-span curved wooden roof

Wind load characteristics of large-span curved roof are complex, and large scale wooden roof construction is rare in practical engineering applications. Based on the wind tunnel test of the large-span curved wooden roof of Haikou Citizen Tourist Center, the distribution law of average pressure coefficient, equivalent static wind load and overall wind load effect of curved wooden roof under different wind directions were systematically analyzed. The test results show that the overall wind load effect of the roof is mainly the suction effect;the average wind pressure coefficient of the inner and outer surface of the roof is mainly affected by the wind direction angle and the location of the measuring points, showing a complex fluctuation law, and there are several average wind pressure coefficient extreme values and the main wind angle working conditions at some important measuring points. In the whole design and calculation process, in addition to the maximum suction condition, it is also necessary to consider the adverse effect of the downdraft condition. In the local design calculation, the key areas and special points with extreme value should be considered.