Structural Monitoring and Maintenance Volume 5, Number 3, September 2018 , pages 325-343 DOI: https://doi.org/10.12989/smm.2018.5.3.325 |
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Optimal design of bio-inspired isolation systems using performance and fragility objectives |
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Fan Hu, Zhiguo Shi and Jiazeng Shan
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Abstract | ||
This study aims to propose a performance-based design method of a novel passive base isolation system, BIO isolation system, which is inspired by an energy dissipation mechanism called \'sacrificial bonds and hidden length\'. Fragility functions utilized in this study are derived, indicating the probability that a component, element, or system will be damaged as a function of a single predictive demand parameter. Based on PEER framework methodology for Performance-Based Earthquake Engineering (PBEE), a systematic design procedure using performance and fragility objectives is presented. Base displacement, superstructure absolute acceleration and story drift ratio are selected as engineering demand parameters. The new design method is then performed on a general two degree-of-freedom (2DOF) structure model and the optimal design under different seismic intensities is obtained through numerical analysis. Seismic performances of the biologically inspired (BIO) isolation system are compared with that of the linear isolation system. To further demonstrate the feasibility and effectiveness of this method, the BIO isolation system of a 4-storey reinforced concrete building is designed and investigated. The newly designed BIO isolators effectively decrease the superstructure responses and base displacement under selected earthquake excitations, showing good seismic performance. | ||
Key Words | ||
bio-inspired isolator; seismic performance; fragility; optimal design | ||
Address | ||
Fan Hu: Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China; Department of Civil and Environmental Engineering, University of California, Berkeley CA, 94704, United States Zhiguo Shi and Jiazeng Shan:Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China | ||