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Experimental and analytical studies of sub-standard RC frames retrofitted with buckling-restrained braces and steel frames
- Source :
- Bulletin of Earthquake Engineering. 18:2389-2410
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Existing reinforced concrete (RC) buildings designed according to outdated codes may lack sufficient strength, stiffness or ductility to meet the seismic performance criteria of current codes. To enhance the system stiffness and re-centering capability, an elastically designed supplementary steel frame (SF) is installed in parallel with the BRBs. Near full-scale cyclic tests are conducted on such retrofit schemes for performance evaluation. The retrofitted specimens showed stable hysteretic behavior up to the retrofit target story drift of 1/150 as proposed in the Japanese seismic regulations. Tests demonstrate that the proposed system is feasible and increases both strength, ductility, and damping to an adequate seismic performance level while the elastic steel frame is effective in providing post-yield stiffness and re-centering capability even when the RC frame is subjected to moderate inelasticity. Special emphasis is placed on the composite behavior of RC members and SF. A simplified composite interaction model is proposed and results from the developed model show good agreement with the experimental data. Ductility demands are shown to concentrate in the BRBs as per the design intent.
- Subjects :
- 021110 strategic, defence & security studies
business.industry
Computer science
Frame (networking)
Emphasis (telecommunications)
0211 other engineering and technologies
Stiffness
02 engineering and technology
Building and Construction
Structural engineering
Rc frames
Geotechnical Engineering and Engineering Geology
Reinforced concrete
Geophysics
Buckling
Steel frame
medicine
medicine.symptom
business
Ductility
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 15731456 and 1570761X
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Bulletin of Earthquake Engineering
- Accession number :
- edsair.doi.dedup.....da8157df8d69edb3f0f791d759646144