典型工程场地台风设计风剖面研究
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1.浙江金华甬金高速公路有限公司杭州科技分公司;2.浙江舟山跨海大桥有限公司;3.同济大学

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P429?????

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Investigation on wind profile of typhoon design in typical engineering sites
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    摘要:

    台风是控制我国沿海地区大跨、高耸结构的关键荷载,台风风剖面与常规良态风风剖面存在较大差异,合理估计台风设计风剖面对指导沿海结构抗风设计至关重要。本文首先选取了国内外8种主要规范/标准开阔地貌的风剖面与实测台风剖面进行对比,现行规范难于考虑台风剖面随高度的变化特征,且未纳入台风剖面随空间位置的演变内容。基于此,本文提出三种台风设计风剖面方法,分别是:基于规范建[1]议风剖面、不同高度相同重现期组合风剖面、基于特定高度重现期风速的真实风剖面,其中方法2和方法3中考虑了台风剖面随高度的变化特征。计算结果显示,方法2和3所得的风剖面均大于规范剖面,方法2获得的剖面与方法3的均值剖面较为接近,但方法2的剖面在真实台风中可能并不存在,且方法3的真实风剖面有接近一半高于方法2的结果。现行规范中推荐的风剖面可能低于台风实际风剖面,且基于不同高度处100年重现期的风剖面亦无法考虑台风真实剖面过程,若只考虑风致建筑物的静力响应,则台风设计风剖面可依照方法3的外包络进行选取。

    Abstract:

    Typhoon is the key load controlling the large span and tall structures in the coastal areas of China. There is a great difference between typhoon wind profile and conventional good wind profile. Reasonable estimation of typhoon design wind profile is very important to guide the wind resistance design of coastal structures. In this paper, the wind profiles of 8 major standard/standard open landforms at home and abroad were first selected to compare with the measured typhoon profiles. The current norms are difficult to consider the variation characteristics of typhoon profiles with height, and do not include the evolution of typhoon profiles with spatial location. Based on this, three wind profile methods for typhoon design are proposed in this paper, which are: the proposed wind profile based on the specification, the combined wind profile based on the same recurrence period at different heights, and the real wind profile based on the wind speed in the recurrence period at specific heights. Methods 2 and 3 consider the characteristics of the typhoon profile changing with height. The calculated results show that the wind profile obtained by method 2 and method 3 is greater than the standard profile, and the profile obtained by method 2 is close to the mean profile of method 3, but the profile of method 2 May not exist in real typhoons, and the real wind profile of method 3 is nearly half higher than the result of method 2. The wind profile recommended in the current specification may be lower than the actual wind profile of typhoon, and the wind profile based on the 100-year recurrence period at different heights cannot take into account the real profile process of typhoon. If only the static response of wind-induced buildings is considered, the design wind profile of typhoon can be selected according to the outer envelope of Method 3.

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  • 收稿日期:2024-07-12
  • 最后修改日期:2024-09-04
  • 录用日期:2024-09-04
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