An Identification Method for Damping Ratio of In Situ Building

Abstract:

Damping evaluation is of great importance in predicting the dynamic response of systems. To get the accurate damping ratios of a system, many identification methods have been proposed and developed. But only few of them achieved accurate results for in-situ buildings due to the fact that the responses are significantly influenced by noise. This paper proposes a new method to accurately identify the damping ratios of in-situ buildings. The method is based on ambient excitation technique which requires no artificial excitation applied to SSI system and to measure output-only. The damping ratio identification is then performed by combining the improved random decrement method and Ibrahim time domain method. To demonstrate the validity of the proposed approach, a case study is performed and the results are compared with the conventional peak-peaking method results. The results show the proposed method can effectively identify the modal parameter of either frequencies or damping ratios of in-situ buildings subjected to ambient excitation.

• Periodical: Advanced Materials Research (Volumes 446-449)
• Pages: 556-560
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.446-449.556
• Online since: January 2012
• Authors: Zhi Ying Zhang, Qing Sun, Zheng Yang
• Keywords: Building, Damping, Excitation, Identification, Soil-Structure Interaction (SSI)

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