Suboptimal Rayleigh damping coefficients in seismic analysis of viscously-damped structures

被引：0
作者：
Danguang Pan
Genda Chen
Zuocai Wang
机构：
[1] University of Science and Technology Beijing,Department of Civil Engineering
[2] Missouri University of Science and Technology,Department of Civil, Architectural, and Environmental Engineering
[3] Hefei University of Technology,Department of Civil Engineering
来源：
Earthquake Engineering and Engineering Vibration | 2014年 / 13卷
关键词：
Rayleigh damping; response spectral analysis; structural dynamics; structural analysis; optimization method;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
An optimization method for the consistent evaluation of two Rayleigh damping coefficients is proposed. By minimizing an objective function such as an error term of the peak displacement of a structure, the two coefficients can be determined with response spectral analysis. The optimization method degenerates into the conventional method used in current practices when only two modes of vibration are included in the objective function. Therefore, the proposed method with all significant modes included for simplicity in practical applications results in suboptimal damping coefficients. The effects of both spatial distribution and frequency content of excitations as well as structural dynamic characteristics on the evaluation of Rayleigh damping coefficients were investigated with a five-story building structure. Two application examples with a 62-story high-rise building and a 840 m long cable-stayed bridge under ten earthquake excitations demonstrated the accuracy and effectiveness of the proposed method to account for all of the above effects.
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页码：653 / 670
页数：17
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