Lakshmi Devi Nalamothu
Independent Researcher
India
Abstract
This study investigates the seismic performance of retrofitted reinforced concrete (RC) buildings through nonlinear static pushover analysis. The objective is to evaluate the effectiveness of various retrofit techniques in improving the seismic capacity and ductility of existing RC structures, which are often vulnerable to seismic hazards due to inadequate original design or deterioration over time. The research incorporates different retrofitting schemes such as steel jacketing, FRP (Fiber Reinforced Polymer) wrapping, and shear wall addition. Using pushover analysis, capacity curves are developed for both the original and retrofitted structures, enabling comparison of base shear, displacement capacity, and performance levels. The findings demonstrate significant enhancement in strength and deformation capacity post-retrofit, affirming pushover analysis as a reliable tool for seismic performance evaluation in retrofit design. The study also discusses the practical implications for engineering design and seismic rehabilitation strategies.
Keywords Seismic performance, Reinforced concrete, Retrofitting, Pushover analysis, Structural capacity, Ductility, Fiber reinforced polymer.
REFERENCES
Bracci, J. M., & Kunnath, S. K. (1997). Seismic performance and retrofit evaluation of reinforced concrete buildings using pushover analysis. Journal of Structural Engineering, 123(1), 3–14. ascelibrary.org
Chopra, A. K., & Goel, R. K. (2002). A modal pushover analysis procedure for estimating seismic demands for buildings: Theory and preliminary evaluation. Earthquake Engineering & Structural Dynamics, 31(3), 561–582. ui.adsabs.harvard.edu
Fajfar, P. (2000). A nonlinear analysis method for performance-based seismic design (the N2 method). Earthquake Spectra, 16(3), 573–592. pubs.geoscienceworld.org
Gupta, A., & Krawinkler, H. (2000). Adaptive spectra-based pushover procedure for seismic evaluation of structures. Earthquake Spectra, 16(2), 367–391. researchgate.net
Antoniou, S., & Pinho, R. (2004). Development and verification of a displacement-based adaptive pushover procedure. Journal of Earthquake Engineering, 8(5), 643–661. ascelibrary.org
Stanly, S., Subramani, V., & Subramani, P. (2017). Pushover analysis of retrofitted reinforced concrete structure using steel and CFRP jacketing. In Proceedings of the National Conference on Emerging Trends in Civil Engineering (NCETCE). researchgate.net
Krawinkler, H., & Seneviratna, G. D. P. K. (1998). Pros and cons of a pushover analysis of seismic performance evaluation. Engineering Structures, 20(4–6), 452–464. digitalcommons.calpoly.edu
Hernández-Montes, E., Kwon, O.-S., & Aschheim, M. (2004). An energy-based formulation for first- and multiple-mode nonlinear static (pushover) analyses. Journal of Earthquake Engineering, 8(1), 69–88. journal.ut.ac.ir
Paret, T. F., Sasaki, K., Elibeck, D. K., & Freeman, S. A. (1996). Approximate inelastic procedures to identify failure mechanisms from higher-mode effects. In 11th World Conference on Earthquake Engineering, Acapulco, Mexico. apps.peer.berkeley.edu
