实际瓦屋面双坡低矮建筑的风荷载特性的数值模拟研究

Numerical Investigation of the Characteristics of Wind Load Acting on the Actual Tile-Roof of Low-Rise Gable-Roofed Buildings

基于Fluent软件平台,采用雷诺应力模型(RSM),对一类实际瓦屋面双坡低矮建筑的风荷载特性进行了研究.首先通过对TTU标准模型的计算,验证了本文数值模拟方法的可行性并确定了合适的网格及计算参数.然后以实际瓦屋面双坡低矮建筑作为典型计算模型,对三种不同屋盖的体型系数进行了数值模拟,将实际瓦屋面模型与风洞试验模型进行了对比分析,并分析了不同风向下瓦片屋盖对于屋面风压的影响.结果表明,实际瓦屋面模型的风压值整体上比风洞试验简化模型的风压值要小,两模型的风压差值从0°风向到90°风向呈递减趋势,且迎风面各分块的风压差普遍大于背风面各分块的风压差.结果还表明,在各风向角下,瓦片屋盖对屋面风压的影响程度不一,且折线瓦对风压的影响相比波形瓦要大.

Based on Fluent soitware and Reynolds stress model（RSM）, the characteristics of wind load acting on the actual tile-roof of low-rise gable-roofed buildings were investigated with numerical simulation technique. First, the feasibility of numerical simulation technique was verified by means of TTU prototype building; and the suitable mesh and parameters were coni＇mned at the same time. Then the actual low-rise gabled-roofed building was used as a computational model, the shape coefficients of this building with three different roofs were calculated, the differences between the actual tile-roof model and the wind tunnel model were compared and analyzed, and the effects of tile-roof on shape coefficient under different wind directions were analyzed. The results show that, the wind pressure of the actual tile-roof model is smaller than the wind pressure of the simplified model of wind tunnel test as a whole, the wind pressure difference between the two models shows a decreasing trend in wind directions from 0° to 90°,and the difference is generally greater on the windward side than on the leeward side. The results also show that the impact of tile-roof on wind pressure is different under various wind directions, and the influence of fold-tile is larger compared with the pan-tile.