Seismic Performance Evaluation of Reinforced Concrete Buildings Retrofitted with a New Concrete Filled Tube Composite Strengthening Systemopen access
- Authors
- Baek, Ho-Jin; Jung, Ju-Seong; Lee, Kang-Seok; Lee, Bok-Gi
- Issue Date
- Dec-2023
- Publisher
- MDPI
- Keywords
- reinforced concrete; CFT; composite strengthening; seismic performance; pseudo-dynamic test; nonlinear dynamic analysis
- Citation
- Applied Sciences-basel, v.2023, no.13, pp 1 - 29
- Pages
- 29
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Sciences-basel
- Volume
- 2023
- Number
- 13
- Start Page
- 1
- End Page
- 29
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/117744
- DOI
- 10.3390/app132413231
- ISSN
- 2076-3417
- Abstract
- This study proposes a concrete-filled tube composite strengthening system (CCSS), which
is a new concept that can improve and supplement the vulnerability of existing CFT seismic strengthening
methods. The CCSS seismic reinforcement method is easy to construct and integrates with
the existing frame and reinforcement. It is one of the seismic strengthening methods that allows
the simple calculation of the required amount of seismic reinforcement and can efficiently increase
the strength when applied to existing reinforced concrete (R/C) buildings with non-seismic details
dominated by shear failure. To examine the seismic safety of the proposed CCSS, two framework
specimens were prepared based on an existing R/C building with non-seismic details. A pseudodynamic
test was conducted on the unreinforced framework specimen and the framework specimen
reinforced with CCSS to verify the seismic strengthening effect of applying CCSS to the existing
R/C framework, i.e., in terms of the load–displacement characteristics and seismic response control
capability. Based on the pseudo-dynamic test results, restoration of the force characteristics was proposed
for the nonlinear dynamic analysis of the building reinforced with CCSS. Nonlinear dynamic
analysis was conducted based on the proposed restoration of the force characteristics, and the results
were compared with the pseudo-dynamic test results. Finally, for the commercialization of CCSS,
nonlinear dynamic analysis was conducted on the existing whole R/C building with non-seismic
details that was reinforced with CCSS. The seismic strengthening effect was then verified by examining
the seismic response load, displacement characteristics, and the degree of seismic damage to the
members based on the ductility ratio before and after seismic strengthening. The study results show
that under a design basis earthquake with a magnitude of 200 cm/s2, the unreinforced R/C building
exhibits shear failure, and light seismic damage is expected on the CCSS-reinforced building.
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