Seismic mobile shaker testing of full-scale RC building frames with high-strength NSM-FRP hybrid retrofit system
- Authors
- Shin, Jiuk; Jeon, Jong-Su; Wright, Timothy R.
- Issue Date
- Oct-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- NSM-FRP hybrid retrofit; Seismically-vulnerable reinforced concrete building frame; Two-stage retrofit design process; Full-scale dynamic test
- Citation
- COMPOSITE STRUCTURES, v.226, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- COMPOSITE STRUCTURES
- Volume
- 226
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/12497
- DOI
- 10.1016/j.compstruct.2019.111207
- ISSN
- 0263-8223
- Abstract
- Past seismic events have led to the premature failure of many existing seismically-vulnerable reinforced concrete building frames due to their inadequate column details. To ensure the ductile behavior of the non-ductile building frames, a hybrid retrofit system combining high-strength near surface mounted bars (flexural retrofit) with carbon fiber reinforced polymer sheets (shear retrofit) can be installed to the seismically-vulnerable columns. This study presents the experimental dynamic assessment of the non-ductile building frames retrofitted with the hybrid system. To prevent the column shear failure due to the flexural strengthening, a two-stage design procedure for the hybrid retrofit system was proposed. The full-scale dynamic testing was performed on the retrofitted test frame to realistically measure dynamic responses and quantify the retrofit effects. The hybrid retrofit system reduced the peak inter-story drift of the first-story columns by about 25% and their hinge rotation by approximately 76%. Additionally, the retrofit system can uniformly distribute the damage or drift over the entire structure, i.e. mitigation of soft-story mechanism.
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