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上海2010年世博会日本馆外形复杂、建筑高度低,考虑到近地面湍流规律的复杂性,对该建筑分别进行了稳态与非稳态数值风洞仿真计算。通过比较两种方法计算得到的平均风压,讨论了数值计算的准确性。在此基础上,研究了该复杂体型建筑的平均风压与脉动风压的分布特性,获得了可用于指导类似结构整体抗风设计和局部抗风设计的规律。鉴于《荷载规范》在低矮房屋围护结构设计中的空白,本文提出采用数值风洞非稳态计算的方法获取阵风系数,与采用规范数值相比该方法获得的表面风荷载更符合实际,能使设计更加安全、经济。
Shanghai World Expo 2010 Shanghai Japan Pavilion complex shape, low building height, taking into account the near-surface turbulence of the complexity of the building were carried out steady-state and unsteady numerical wind tunnel simulation. By comparing the average wind pressure calculated by the two methods, the numerical accuracy is discussed. On this basis, the distribution characteristics of the average wind pressure and fluctuating wind pressure of the complex body building are studied, and the laws that can be used to guide the overall wind resistance design and local wind resistance design of the similar structure are obtained. In view of the blank of “Code of Load” in the design of enclosure structure for low-rise buildings, this paper proposes to obtain the gust coefficient by numerical wind tunnel non-steady-state calculation method, which is more realistic than the wind load obtained by this method. Make design more secure and economical.