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Seismic behavior of strengthened RC columns under combined loadings
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SYSNO ASEP 0556934 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Seismic behavior of strengthened RC columns under combined loadings Author(s) Huang, H. (CN)
Guo, M. (CN)
Zhang, Wei (UTAM-F) RID, ORCID, SAI
Huang, M. (CN)Number of authors 4 Article number 05022005 Source Title Journal of Bridge Engineering. - : American Society of Civil Engineers - ISSN 1084-0702
Roč. 27, č. 6 (2022)Number of pages 16 s. Publication form Print - P Language eng - English Country US - United States Keywords combined loadings ; damage ; seismic ; strengthened ; RC columns OECD category Civil engineering Method of publishing Limited access Institutional support UTAM-F - RVO:68378297 UT WOS 000782623800002 EID SCOPUS 85126756594 DOI 10.1061/(ASCE)BE.1943-5592.0001871 Annotation Twenty-five reinforced concrete (RC) columns of section size 250 × 250 mm were designed and tested to study the seismic response considering the effect of loading case, strengthening method, and the predamage level, containing 21 columns reinforced with high-performance ferrocement laminate (HPFL)-bonded steel plates (BSPs), i.e., the intact strengthened columns (ISCs), earthquake-damaged strengthened columns (EDSCs), corrosion-damaged strengthened columns (CSCs) and coupled-predamaged strengthened columns (CPSCs). The bearing capacity of the specimens under the four different types of loading methods is ranked as follows: uniaxial compression–bending–shear (CBS) members, biaxial CBS members, biaxial CBS-torsion (CBST) members, and uniaxial CBST members. Compared with nonstrengthened specimens, the cracks of the strengthened RC columns are more fully developed, and the failure modes have been changed after strengthening. The failure modes and load–deformation curves had little significant difference for the strengthened RC columns with different damage under combined loading levels. The bearing capacity of strengthened RC columns with the applied loading of 400 kN improved, which increased to 60.1%–114.7%, 29.9%–103%, 65.2%–127%, and 49.2%–104.5% for ISCs, EDSCs, CSCs, and CPSCs, respectively. Moreover, the bearing capacity of specimens decreased due to the existence of horizontal eccentricity. Finally, based on the degraded trilinear restoring force model, the strengthened influence coefficient for loading α and displacement β and the torsion influence coefficient for loading γ and displacement ξ were introduced. A modified restoring force model of RC columns was presented, reflecting the loading method, predamage level, and strengthening method. The theoretical calculation values align with the test load–deformation curves, and the mean absolute error is almost less than 15%. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2023 Electronic address https://doi.org/10.1061/(ASCE)BE.1943-5592.0001871
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