Universal Equivalent Static Wind Loads of Fluctuating Wind Loads on Large-Span Roofs Based on POD Compensation
Universal Equivalent Static Wind Loads of Fluctuating Wind Loads on Large-Span Roofs Based on POD Compensation
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DOI：
10.1260/1369-4332.18.9.1443
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发表时间：
2015-08
影响因子：
2.6
通讯作者：
Wuyi Sun;M. Gu;Xuanyi Zhou
中科院分区：
文献类型：
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作者：
Wuyi Sun;M. Gu;Xuanyi Zhou
在现有等效风荷载方法的基础上，结合POD补偿，提出了大跨度屋盖脉动风荷载的补偿静风荷载方法，降低了现有方法对给定目标响应可能产生的较大误差。在这两种方法中，首先在风洞试验的基础上计算结构脉动风荷载的TRS和POD振型。得到了现有方法产生的未补偿的ESWL及其近似的ESWLS响应。在补偿ESWLS方法中，使用现有方法中的RR和ESWLS诱导的响应之间的响应差值作为TRs的补偿值。现有方法根据补偿值构造补偿后的POD模式和相应的补偿贡献因子，分别插入到POD模式矩阵和贡献因子向量中，形成新的POD模式矩阵和新的贡献因子向量。修正后的ESWLS分布由上述新矩阵和新向量的乘积表示。最后，将补偿后的ESWL方法应用于实际复杂大跨度屋盖。计算结果表明，补偿ESWL法具有物理意义明确、计算原理简单、计算精度高等优点，若能更合理地确定TRs，则可满足工程设计的需要。
Based on an existing equivalent static wind loads (ESWLs) method, this paper, with the help of POD compensation, presents a compensated ESWLs method of fluctuating wind loads on large-span roofs, which lowers the possible considerable errors produced in the existing method for those given target responses (TRs). In the two methods, TRs and POD modes of fluctuating wind loads on the structure based on the wind tunnel test are firstly computed. The uncompensated ESWLs and their approximate ESWLs-induced responses caused by the existing method are acquired. In the compensated ESWLs method, the response differences between TRs and ESWLs-induced responses in the existing method are used as the compensated values of TRs. According to the compensated values, the compensated POD mode and corresponding compensated contribution factor are constructed and respectively inserted to POD mode matrix and contribution factor vector in the existing method, which form a new POD mode matrix and a new contribution factor vector. The modified ESWLs distribution is then expressed by the product of above new matrix and new vector. The compensated ESWLs method is finally applied to an actual complex large-span roof. The computational results demonstrate that the compensated ESWLs method has the merits of clear physical meaning, simple computational principles and high computational accuracy, and it maybe meets the needs of the engineering designs if TRs are determined more reasonably.