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浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (9): 1573-1578    DOI: 10.3785/j.issn.1008-973X.2013.09.009
    
Comparison of time domain and frequency domain methods to
obtain wind-induced responses of civil engineering structures
SHEN Guo-hui1, WANG Ning-bo2, REN Tao3, SHI Zhu-yuan3, LOU Wen-juan1
1.Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China；
2.China Northwest Building Design Research Institute, Xi’an 710003, China；
3.Zhejiang Institute of Architectural Design, Hangzhou 310006, China
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Abstract  

The problem whether the wind-induced responses of civil engineering structures obtained using the time domain method are equal to the responses obtained using the frequency domain method was investigated. Taking a high-rising building and a cooling tower as examples, the responses obtained using these two methods were compared, which were calculated under the same wind loading conditions. The reasons for the discrepancy between the two results were analyzed and the countermeasures to reduce the discrepancy were suggested. This study can be a good reference for the rational application of these two methods in solving the wind-induced responses of structures. Results show that the contribution of a certain vibration mode can be quantified by the strain energy of the mode in the frequency domain analysis. The calculating model is one of dominating factors leading to the discrepancy of the results obtained using the time and frequency domain methods. If the same calculating model is used, the results obtained using these two methods will be close. The treatment of structural damping during the calculating process is also a reason leading to the discrepancy of the results．

Published: 01 September 2013
CLC:  TU 312.1  
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Cite this article:

SHEN Guo-hui, WANG Ning-bo, REN Tao, SHI Zhu-yuan, LOU Wen-juan. Comparison of time domain and frequency domain methods to
obtain wind-induced responses of civil engineering structures. J4, 2013, 47(9): 1573-1578.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2013.09.009     OR     http://www.zjujournals.com/eng/Y2013/V47/I9/1573


建筑结构风致响应的时频域计算方法比较

针对结构风致响应的时域法结果和频域法结果是否一致的问题,以高层建筑和冷却塔为例比较两种方法在相同的风荷载条件时的响应结果,分析时域法和频域法产生结果差异的原因并给出减少差异的措施,为两种方法在求解结构风致响应的合理应用提供参考.研究表明：频域分析中根据各阶模态的应变能确定该阶模态的贡献程度；计算模型是影响时频域结果吻和程度的一个重要因素,如果两种方法采用相同的计算模型,那么两种方法得到的计算结果会非常接近；计算中结构阻尼的处理方式也是导致时频域计算结果差异的一个原因.

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