开孔建筑内压风洞试验及其与国内外规范对比

Wind Tunnel Study of Internal Pressure of Opening Buildings and its Comparison with National and International Codes

摘要:

通过风洞试验研究开孔建筑孔口周边外压与内压的相关性以及湍流强度、风向角和开孔率对内压的影响，并将风洞试验结果与国内外现行风荷载规范进行对比，分析各国规范的优势和不足。研究表明，开孔结构内压与孔口周边外压在时程上具有高度的同步性，但是斜风向角时在功率谱上存在很大的差异，内压均值响应随湍流度和开孔率的增大而增大。我国规范和美国ASCE7-16均较大低估了内压系数的大小，而澳大利亚/新西兰AS/NZS 1170.2：2011对内压系数的取值与风洞试验结果吻合较好。

Abstract:

Wind tunnel tests were conducted to study the correlation of the internal pressure of opening buildings and the external pressure around the orifice， as well as the effects of turbulence intensity， wind direction and opening ratio on the internal pressures. In addition， the wind tunnel test results were compared with national and international codes， and advantages and disadvantages of these codes were also analyzed. It is found that the internal pressure of the opening building is highly synchronous with the external pressure around the orifice in the time history， but it is quite different in the power spectrum at oblique wind angles. The mean internal pressure responses increase with the increase in turbulence intensity and opening ratio. Both the Chinese load code and the American ASCE7-16 greatly underestimated the internal pressure coefficient， while the internal pressure coefficients proposed by AS/NZS 1170.2：2011 are in good agreement with the wind tunnel test results.