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低矮房屋屋面实测峰值风压分析
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Analysis of the Field Measured Suction Peak Pressure Coefficients on the Flat Roof of a Low-rise Building
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    摘要:

    通过作者研制的一套可移动实验房及测试系统对近地登陆台风风速和房屋表面风压进行同步观测,研究登陆台风近地边界层风场和低矮房屋风效应.基于0801“浣熊”台风实测数据,分析了实验房屋面角部区域局部峰值负压分布特征和相关性,探讨了角部区域峰值压力时间和空间的平均拆减效应.结果发现,峰值负压系数大于现行规范规定值;并运用广义极值概率模型极值III型对角部测点峰值负压进行极值分析,角部测点峰值负压系数与其实测峰值负压相比要大26.4%.相对良态天气条件,在台风天气作用下低矮房屋屋面角部区域局部易形成较高吸力远大于现行规范推荐值.

    Abstract:

    full-scale moveable instrumented low-rise building was constructed and implemented to measure the wind velocity and the associated building surface pressures during typhoon landfalls. The major objective of the field study was to further understand the typhoon-generated wind characteristics and the wind effects on the low-rise building under extreme wind conditions. Based on the pressure data measured on a roof corner of the experimented building during the 0801 typhoon Neoguri, it was shown that high local suctions were observed under the oblique flows, the pressure distribution and the cross-correlation coefficients between various taps of a roof corner area. The observed minimal pressure-coefficients were higher than those recommended for the design of the corner zone by current design building codes. The Generalized Extreme Value (GEV) distributions were used to fit the peak suction pressure coefficients,and it was found that the Type III Extreme Value distribution matched the data well. It was revealed that the predicted upper limits of the peak pressure coefficients were more than 20% higher in magnitude than the highest values actually measured. Compared with those obtained under non-typhoon wind climates, the corner section of the roof experienced higher local suctions during typhoons.

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李秋胜,胡尚瑜,戴益民,李正农.低矮房屋屋面实测峰值风压分析[J].湖南大学学报:自然科学版,2010,37(6):11~16

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