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Seismic retrofit of non-ductile reinforced concrete frames with chevron braces
Date
2013-07-01
Author
ÖZÇELİK, RAMAZAN
Binici, Barış
Akpinar, Ugur
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The use of chevron braces for seismic strengthening of existing non-ductile reinforced concrete frames was investigated experimentally and numerically. Five strengthened and two as-built reference portal frame specimens were tested under a constant gravity load and increasing cyclic lateral displacement excursions. The test results indicated that steel brace retrofitting increased the lateral stiffness, strength and energy dissipation capacity significantly. Specimens strengthened with square hollow sections experienced significant strength degradation upon brace buckling, but a lateral strength of about 3.5 times the strength of bare frames was maintained up to a drift ratio of about 2% in all strengthened specimens. Non-linear cyclic analysis was conducted to simulate the behaviour of the test specimens. A satisfactory agreement with estimated and observed load-deformation responses was observed. Using test observations and simulation results, the deformation capacity limits of chevron brace strengthened deficient frames were discussed. A parametric study was conducted to investigate the effectiveness of the chevron brace retrofitting for different brace sizes and column axial loads. Finally, a non-linear time history analysis was performed for a building frame of a deficient existing four-storey three-bay reinforced concrete structure by using two chevron brace sections in this study.
Subject Keywords
Concrete structures
,
Rehabilitation, reclamation & renovation
,
Seismic engineering
URI
https://hdl.handle.net/11511/39390
Journal
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS
DOI
https://doi.org/10.1680/stbu.12.00002
Collections
Department of Civil Engineering, Article
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R. ÖZÇELİK, B. Binici, and U. Akpinar, “Seismic retrofit of non-ductile reinforced concrete frames with chevron braces,”
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS
, pp. 326–341, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39390.