Lateral cyclic performance of a CFRP retrofitted two-story RC frame with open ground story
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Lateral cyclic performance of a CFRP retrofitted two‑story RC frame with open ground story Birendra K. Karaiya1 · Romanbabu M. Oinam2 · Dipti Ranjan Sahoo1 · Ashok Gupta1 Received: 21 January 2020 / Accepted: 21 July 2020 © Springer Nature B.V. 2020
Abstract This study presents the cyclic performance of a reinforced concrete (RC) frame retrofitted using carbon fiber-reinforced polymer (CFRP) jackets. A damaged two-story non-ductile RC frame with the open ground story and the masonry-infilled top story was considered as the test specimen in the experimental investigation. Only shear-damaged ground story columns were retrofitted using CFRP jacketing. The retrofitted frame was subjected to a gradually-increasing reversed cyclic lateral loading to investigate its lateral strength, mode of failure, displacement ductility, and the energy dissipation potential. Test results showed that the retrofitted frame sustained a roof drift of 2.5% without any substantial reduction in the lateral resistance. An analytical investigation was also carried out to predict the lateral strength and displacement ductility of the retrofitted frame using the theoretical models available in the literature. The analytical model predicted the lateral strength of the retrofitted frame to a reasonable accuracy. Keywords Fiber-reinforced polymer · Reinforced concrete frame · Retrofitting · Seismic resistance · Soft-story · Structural failure List of symbols Ag Gross area of column section Ast Area of stirrup steel Asv Area of transverse stirrups b Width of FRP confined section * Dipti Ranjan Sahoo [email protected] Birendra K. Karaiya [email protected] Romanbabu M. Oinam [email protected] Ashok Gupta [email protected] 1
Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
2
Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Tirupati, Andhra Pradesh 517506, India
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Bulletin of Earthquake Engineering
h Depth of FRP confined section d Effective depth Ef Elastic modulus of FRP jacket Eloop Energy dissipated in any hysteretic loop at a drift level Er Double-modulus of steel F Peak lateral force in any cycle fc′ Unconfined compressive stress of concrete, fcc Confined compressive stress of concrete fl Average lateral pressure in orthogonal directions fs,crit Critical stress level in compression reinforcing steel fy Material yield stress of steel Keff Effective lateral stiffness of frame kf Effective confinement coefficients of FRP jacket kst Effective confinement coefficients of stirrups lp Length of plastic hinge Ls Shear span length My Yield flexural strength n Number of FRP jacket layer Pu Axial load on column s Longitudinal spacing of stirrups tf Thickness of FRP ply Vcon Shear strength of column concrete Vfw Shear strength contribution of FRP jacket 𝛽eq Equivalent viscous damping Δ Peak lateral displacement in any cycle 𝜀co Strain at peak stress of unconfined concrete 𝜀cc St
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