等高双方柱平均风压的阻塞效应

Blockage Effects on Mean Wind Pressure of Two Square Cylinders of Same Height

摘要:

基于同步测压技术，在均匀流场中研究了等高双方柱在3种不同布置情况下平均风压的阻塞效应.群体建筑投影面阻塞度的变化范围为2.7%~10.0%.风洞试验结果表明，在均匀来流中，群体建筑平均风压系数的阻塞效应和单体建筑的较为相似，阻塞效应对模型迎风面平均风压的影响可以忽略；但侧面和背风面平均负压随阻塞度增加显著增大.此外，基于风洞试验结果拟合了平均风压修正公式中的阻塞效应调整因子.对比单体建筑，群体建筑的阻塞效应调整因子更小，阻塞效应更加复杂.

Abstract:

Blockage effects on mean wind pressure of two square cylinders of the same height in three different layouts in uniform flow were investigated using the synchronous wind pressure measurement technique. Blockage ratios of projected areas of the building group change from 2.7% to 10.0%. The wind tunnel test results show that in uniform flow, the blockage effects on the mean pressure coefficient of the building group are similar to that of an isolated tall building. The blockage effects on mean pressure of the windward surface of the target building can be ignored, while those of side surfaces and leeward surface increase significantly with the increase of blockage ratio. In addition, adjustment factors in the formula for correcting blockage effects on mean pressure coefficient were fitted based on wind tunnel test results. Compared with an isolated building, adjustment factors for blockage effects of the building group are smaller, and blockage effects are more complicated.