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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2010, Vol. 11 Issue (5): 325-334    DOI: 10.1631/jzus.A0900155
Mechanics and Civil Engineering     
Perturbation spectrum method for seismic analysis of non-classically damped systems
Wei Guo, Hong-nan Li, Zhen Guo
State Key Laboratory of Coastal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China, Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  Fundamental principles from structural dynamics, random theory and perturbation methods are adopted to develop a new response spectrum combination rule for the seismic analysis of non-classically damped systems, such as structure-damper systems. The approach, which is named the perturbation spectrum method, can provide a more accurate evaluation of a non-classically damped system’s mean peak response in terms of the ground response spectrum. To account for the effect of non-classical damping, all elements are included in the proposed method for seismic analysis of structure, which is usually approximated by ignoring the off-diagonal elements of the modal damping matrix. Moreover, as has been adopted in the traditional Complete Quadratic Combination (CQC) method, the white noise model is also used to simplify the expressions of perturbation correlation coefficients. Finally, numerical work is performed to examine the accuracy of the proposed method by comparing the approximate results with exact ones and to demonstrate the importance of the neglected off-diagonal elements of the modal damping matrix. In the examined cases, the proposed method shows good agreement with direct time-history integration. Also, the perturbation spectrum method leads to a more efficient and economical calculation by avoiding the integral and complex operation.

Key wordsSeismic response      Non-classical damping      Perturbation technique      Response spectrum method      Forced decoupling method      Pseudo excitation     
Received: 08 April 2009      Published: 27 April 2010
CLC:  TU311.3  
Cite this article:

Wei Guo, Hong-nan Li, Zhen Guo. Perturbation spectrum method for seismic analysis of non-classically damped systems. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(5): 325-334.

URL:

http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0900155     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2010/V11/I5/325

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