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Title |
Seismic Capacity Evaluation of Existing Medium-and low-rise R/C Frame Retrofitted by H-section Steel Frame with Elastic Pad Based on Pseudo-dynamic testing
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Authors |
김진선(Jin-Seon Kim) ; 이강석(Kang-Seok Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.4.83 |
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Keywords |
철근콘크리트; 내진보강; 내진성능; 유사동적실험; 내력증진법; 중·저층 Reinforced concrete; Seismic strengthening; Seismic capacity; Pseudodynamic; Strength increasing method; Medium-to-low-rise |
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Abstract |
In this study, to improve the connection performance between the existing reinforced concrete (R/C) frame and the strengthening member,we proposed a new H-section steel frame with elastic pad (HSFEP) system for seismic rehabilitation of existing medium-to-low-rise reinforced concrete(R/C) buildings. This HSFEP strengthening system exhibits an excellent connection performance because an elastic pad is installed between the existingstructure and reinforcing frame. The method shows a strength design approach implemented via retrofitting, to easily increase the ultimate lateralload capacity of R/C buildings lacking seismic data, which exhibit shear failure mechanism. Two full-size two-story R/C frame specimens were designedbased on an existing R/C building in Korea lacking seismic data, and then strengthened using the HSFEP system; thus, one control specimen and onespecimen strengthened with the HSFEP system were used. Pseudodynamic tests were conducted to verify the effects of seismic retrofitting, and theearthquake response behavior with use of the proposed method, in terms of the maximum response strength, response displacement, and degree ofearthquake damage compared with the control R/C frame. Test results revealed that the proposed HSFEP strengthening method, internally appliedto the R/C frame, effectively increased the lateral ultimate strength, resulting in reduced response displacement of R/C structures under large scaleearthquake conditions.
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