Seismic Response Analysis of Composite Isolation Structures with Non-Classical Damping

Author:

Wang Jinghui12ORCID,Tan Ping123ORCID,Huang Tiancan3,He Xuefeng3,Zhou Fulin123,Zheng Xiaojun12

Affiliation:

1. School of Civil Engineering, Guangzhou University, Guangzhou 510006, P. R. China

2. Key Laboratory of Earthquake Resistance, Earthquake Mitigation and Structural Safety, Ministry of Education, Guangzhou 510006, P. R. China

3. Earthquake Engineering Research and Test Center, Guangzhou University, Guangzhou 510006, P. R. China

Abstract

In this paper, a physical index for quantitatively evaluating the non-proportional damping characteristics is proposed. Additionally, a direct design approach applicable to composite isolated structures (consisting of an upper damping structure and a base isolation system) is proposed for performance analysis of practical three-dimensional non-proportional damped structures. Furthermore, the elastic–plastic behavior of the structure under acceleration excitation is considered to determine the structural damage and response, improving computational accuracy and providing better solutions for the analysis and design of composite isolated structures. Analysis studies have shown that under rare and extremely rare earthquake events, structures designed using the complex modal response spectrum method (CM-RSM) exhibit less damage compared to those designed using the forced decoupling response spectrum method (FD-RSM) compared to the results obtained using the complex modal response spectrum method. For the seismic performance study of non-proportional damped structures, it is recommended to use the complex modal response spectrum method. With an increasing earthquake intensity, the proportion of energy dissipation due to the nonlinear strain energy dissipation of a structure increases, and the proportion of energy dissipation due to the isolators and dampers in the damping energy portion decreases.

Funder

National Key Research and Development Program

Innovative Research Group Project of the National Natural Science Foundation of China

Publisher

World Scientific Pub Co Pte Ltd

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