IDENTIFICATION OF DAMPING RATIOS OF SOIL-STRUCTURE SYSTEM SUBJECTED TO AMBIENT EXCITATION
Accurate evaluation of damping ratios of a system is a prerequisite for seismic design involving soil-structure interaction (SSI) effects. The investigations on determining the damping ratios of soil-structure systems, however, lack robustness due to the complexity of such systems. This study proposes a combined approach to obtain accurate damping ratios of SSI systems. Peak-picking (PP) method is employed to extract natural frequencies of the SSI system and damping ratios are derived using the stochastic subspace method. The advantages of the proposed approach are discussed with detailed description of the principle, experiments, and formula. In effort to demonstrate the feasibility and validity of the proposed technique, a practical example is presented. The results indicate the proposed method can effectively identify the damping ratios of soil-structure system subjected to ambient excitation. It is directly useful in damping ratios identification of an SSI system.
damping ratio soil-structure interaction system ambient ezcitation modal parameter identification
Zhi-Ying ZHANG Qiang PAN Chong-Du CHO Zhan-Chao GAO
Human Settlements and Civil Engineering College, Xian Jiaotong University, China State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092 Department of Mechanical Engineering, Inha University, Incheon 402751, Korea
国际会议
International Symposium on Geoenvironmental Engineering(国际环境岩土工程研讨会
杭州
英文
492-496
2009-09-08（万方平台首次上网日期，不代表论文的发表时间）