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对某大跨度曲面屋盖结构分批进行了风洞试验,第1批测点定义为同步测点,第2批测点定义为非同步测点。根据POD方法采用前若干阶本征模态重建了屋盖的风压场。通过同步测点的风压场预测非同步测点的风压场,并将其与实测非同步风压场进行对比。结果表明,预测风压场与实测风压场吻合较好,说明POD方法在风压预测应用中是有效的。根据随机振动理论,通过风荷载相干函数分析,建立同步与非同步风荷载的相关性,从而提出一种考虑非同步风场的风荷载计算方法。
The wind tunnel test was carried out in batches on a long span curved roof structure. The first batch of measuring points was defined as synchronous measuring points and the second measuring point was defined as asynchronous measuring point. According to the POD method, the wind pressure field of the roof is reconstructed by using some eigenstates before. The wind pressure field of asynchronous measuring point is predicted by the wind pressure field of synchronous measuring point and compared with the measured unsynchronized wind pressure field. The results show that the predicted wind pressure field is in good agreement with the measured wind pressure field, indicating that the POD method is effective in wind pressure prediction. According to the theory of random vibration, through the analysis of coherence function of wind load, the correlation between synchronous and unsynchronized wind load is established, and then a wind load calculation method considering unscented wind field is proposed.