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

作     者：Pan Danguang Chen Genda Wang Zuocai 

作者机构：Department of Civil Engineering University of Science and Technology Beijing Department of Civil Architectural and Environmental Engineering Missouri University of Science and Technology Department of Civil Engineering Hefei University of Technology 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2014年第13卷第4期

页      面：653-670页

核心收录：

学科分类：081405[工学-防灾减灾工程及防护工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0813[工学-建筑学] 0802[工学-机械工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China under Grant No.51078032 the Visiting Scholar Foundation of China Scholarship Council the Center for Infrastructure Engineering Studies at Missouri University of Science and Technology 

主　　题：Rayleigh damping response spectral analysis structural dynamics structural analysis optimization method 

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.