体育场悬挑屋盖空间风激动力响应和等效风荷载实用计算

本文推导了悬挑屋盖空间动力响应的理论公式,提出了等效静力风荷载实用计算方法。动力响应公式中考虑了空 间脉动风压分布和多个空间振型的贡献,且给出了显式表达式,工程应用方便;等效静力风荷载是基于惯性风荷载方法提 出的。结合等效风荷载的计算,本文利用两座体育场风洞试验的测压数据,拟合了其悬挑屋盖脉动风压谱的经验公式。经 工程算例表明,本文方法对悬挑屋盖的风振计算具有较理想的计算精度。

Practical method for spatial wind-induced dynamic response and equivalent wind load of cantilevered roofs of stadiums

This paper derives formulae for spatial wind-induced dynamic response of cantilevered roofs and presents calculation practical method for equivalent static wind load. In consideration of the distribution of fluctuating pressure and contribution of multiple spatial modes, exploit expression of dynamic response is given, which is easy to apply. Based on the concept of inertial wind load, equivalent static wind load can be obtained. According to pressure data given by wind tunnel tests of two stadiums, this paper presents empirical expressions of power spectrum density and coherent function of fluctuating wind pressure on cantilevered roofs and calculated equivalent static wind load. It is verified by an example that the accuracy of this method is acceptable.