Resilience-based retrofitting of existing urban RC-frame buildings using seismic isolation
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EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
October, 2020
DOI: https://doi.org/10.1007/s11803-020-0599-1
Earthq Eng & Eng Vib (2020) 19: 839-853
Resilience-based retrofitting of existing urban RC-frame buildings using seismic isolation Yang Cantian1†, Xie Linlin2,3‡, Li Aiqun1,2,3§, Zeng Demin3§, Jia Junbo3§, Chen Xi4* and Chen Min3# 1. School of Civil Engineering, Southeast University, Nanjing 211189, China 2. The Research and Development Joint Center of Energy Dissipation Technology of Southeast University and Forceset Corporation, Southeast University, Nanjing 211189, China 3. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China 4. Beijing Institute of Architectural Design, Beijing 100045, China
Abstract:
The improvement of the seismic resilience of existing reinforced-concrete (RC) frame buildings, which is essential for the seismic resilience of a city, has become a critical issue. Although seismic isolation is an effective method for improving the resilient performance of such buildings, target-oriented quantitative improvements of the resilient performance of these buildings have been reported rarely. To address this gap, the seismic resilience of two existing RC frame buildings located in a high seismic intensity region of China were assessed based on the Chinese Standard for Seismic Resilience Assessment of Buildings. The critical engineering demand parameters (EDPs) affecting the seismic resilience of such buildings were identified. Subsequently, the seismic resilience of buildings retrofitted with different isolation schemes (i.e., yield ratios) were evaluated and compared, with emphasis on the relationships among yield ratios, EDPs, and levels of seismic resilience. Accordingly, to achieve the highest level of seismic resilience with respect to the Chinese standard, a yield ratio of 3% was recommended and successfully applied to the target-oriented design for the seismic-resilience improvement of an existing RC frame building. The research outcome can provide an important reference for the resilience-based retrofitting of existing RC frame buildings using seismic isolation in urban cities.
Keywords: existing urban RC frame building; retrofitting using seismic isolation; seismic resilience; yield ratio
1 Introduction Over the last 30 years, modern cities in China have seen an increase in the number of reinforced-concrete (RC) frame buildings, including hospitals, schools, offices, and government buildings, which are essential for the seismic resilience of a city. To evaluate and improve the seismic resilience of a city, it is necessary to first quantify the seismic resilience of typical existing RC Correspondence to: Xie Linlin, The Research and Development Joint Center of Energy Dissipation Technology of Southeast University and Forceset Corporation, Southeast University, Nanjing 210096, China Tel: +86-15652316896 E-mail: [email protected] † PhD Candidate; ‡Associate Professor; §Professor; *Senior Engineer; # Fo
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