论文部分内容阅读
下击暴流作用于建筑物将产生严重破坏,虽然其引起的风荷载已有较多研究,但均局限于无降雨的干下击暴流作用情况。目前,已有研究表明风雨环境下的建筑风驱雨(wind-driven rain,WDR)可能产生较显著的雨压荷载,因此对有降雨的湿下击暴流作用下建筑立面WDR雨压开展研究十分必要。基于建筑WDR数值模拟方法,引入欧拉多相流模型,采用RNG k-ε湍流模型封闭求解N-S方程,模拟求解湿下击暴流的建筑WDR场,侧重考虑建筑距风暴中心位置及雨强变化的情况,分析迎风面WDR雨压分布特性并与干下击暴流作用下的纯风压进行比较。结果表明:随着建筑远离风暴中心,雨压存在先增大后又减小的现象;迎风面沿竖直中心线上同处的雨压可达纯风压的20%,且迎风面较大风压、雨压均出现在建筑底部位置,因此湿下击暴流风压与雨压联合作用将比较显著,需要考虑其对建筑的影响。
Downburst will exert serious damage on the buildings. Although the wind loads caused by it have been studied more, they are all limited to the action of the storm under the condition of no rainfall. At present, studies have shown that wind-driven rain (WDR) under wind and rain conditions may produce more significant rain load, and therefore the WDR rain pressure on the building facade is affected by the rainstorm rainstorm with rainfall Research is necessary. Based on the WDR numerical simulation method, the Euler multiphase flow model is introduced, and the RN equations are closed with the RNG k-ε turbulence model to simulate the WDR field of the building with wet-thunderstorm flow. The emphasis is placed on the location of the storm from the building and the change of rainfall intensity The wind pressure distribution on the windward WDR is analyzed and compared with the pure wind pressure under the action of the downburst. The results show that as the building moves away from the storm center, the rain pressure first increases and then decreases. The rain pressure on the upwind surface along the vertical centerline reaches 20% of the pure wind pressure, Both pressure and rain pressure appear at the bottom of the building. Therefore, the combined effect of wind pressure and rain pressure on wet-blow storm flow will be more significant, and the impact on the building needs to be considered.