Seismic Behavior of Repaired and Externally FRP-Jacketed Short Columns Built with Extremely Low-Strength Concrete
Publication: Journal of Composites for Construction
Volume 26, Issue 1
Abstract
Short columns with deficiencies of low-strength concrete and large spacing of transverse reinforcement are quite common in construction practice in many developing countries in seismically active regions. Therefore, it is important to retrofit this type of column to avoid negative consequences in the case of severe damage. External fiber–reinforced polymer (FRP) jacketing is one of the most practical methods to retrofit reinforced concrete (RC) frame members against shear actions. However, knowledge of the seismic behavior of FRP-retrofitted RC short columns is still limited. Thus, the aim of this study was to investigate the seismic response of FRP-retrofitted low-strength RC short columns with and without predamage through the testing of 11 short column specimens representing old and deficient RC buildings. Accordingly, the results of a research program on the seismic behavior of such columns and on their repair and FRP retrofitting, covering experimental and analytical phases, are presented. In the experimental phase, test results obtained for short columns, FRP-retrofitted short columns, and repaired and retrofitted short columns are documented. Test results provide important knowledge about the effects of extremely low-strength concrete, and of different levels of predamage on the behavior of FRP-retrofitted substandard short columns. In the analytical phase, the performance of relevant design documents in predicting the shear strength of such columns retrofitted with FRP jacketing was tested through the comparison of predicted and experimental results.
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Acknowledgments
The authors express their grateful thanks to I.H. Basegmez, D. Akgun, Y. Candan, O. Incecik, and C. Demir for their assistance during tests. The BASF chemical company provided the repair and retrofitting materials. Thanks are due to TUBITAK (The Scientific and Technological Research Council of Turkey) for providing the grants to continue this research at Purdue University.
Notation
The following symbols are used in this paper:
- b
- width of specimen;
- Ef
- elastic modulus of FRP;
- Es
- Young’s modulus of steel;
- compression strength of FRP confined concrete;
- compression strength of unconfined concrete;
- ft
- tensile strength of FRP;
- h
- depth of specimen;
- L
- length of shear span;
- sf
- clear spacing between FRP strips;
- tf
- nominal thickness of FRP;
- Vc
- contribution of concrete to shear strength of column;
- Vexp
- experimental shear strength capacity;
- Vf
- contribution of FRP to shear strength of column;
- Vmax
- maximum shear force limit;
- Vr
- total shear strength capacity;
- Vs
- contribution of steel to shear strength of column;
- wf
- width of discrete FRP strips;
- δ
- lateral displacement;
- δVexp
- lateral displacement at peak load (Vexp);
- δ0.85Vexp
- lateral displacements at 85% of the peak load on the descending branch of the shear force-drift ratio relationship;
- ɛy
- yield strain;
- ɛsh
- hardening strain;
- ɛsmax
- strain corresponding to maximum stress;
- ɛsu
- ultimate tensile strain of steel;
- μ
- ductility coefficients; and
- ρ
- density of FRP.
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Journal of Composites for Construction
Volume 26 • Issue 1 • February 2022
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© 2021 American Society of Civil Engineers.
History
Received: Mar 7, 2020
Accepted: Oct 6, 2021
Published online: Dec 14, 2021
Published in print: Feb 1, 2022
Discussion open until: May 14, 2022
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