Abstract
The primary objectives of this study were to experimentally investigate the shear characteristicsof the interface between an existing RC column and a reinforced concrete (RC) beam added to the existing RC column, and to propose a formula for estimating the shear capacity of the beam-column interface. The major test variables consisted of concrete strength, added steel reinforcement ratio and shear span to depth ratio. Failure characteristics, displacements at the loading point, slips of the beam-column interface, and shear capacities of the beam-column interface were analyzed. Test results indicate that both the shear capacity of the beam-column interface and the corresponding interfacial slip increased with a decrease in shear span to depth ratio. In addition, as concrete strength grew, the shear capacity of the beam-column interface increased, but the interfacial slip corresponding to the interfacial shear capacity remained almost unchanged. Moreover, both the shear capacity of the beam-column interface and the corresponding interfacial slip increased with an increase in the longitudinal steel reinforcement ratio of the added RC beam. A formula for predicting the shear capacity of the beam-column interface was developed. The test results validate the proposed formula and provide important guidance for the design of the RC beam added to the existing RC column.
Similar content being viewed by others
References
Achillopoulou D, Karabinis A (2013) Investigation of shear transfer mechanisms in repaired damaged concrete columns strengthened with RC jackets. Structural Engineering and Materials 47(4):575–598, DOI: https://doi.org/10.12989/sem.2013.47.4.575
Achillopoulou D, Pardalakis T, Karabinis A (2014) Interface capacity of repaired concrete columns strengthened with RC jackets. Transactionsof the Všb — Technical University of Ostrava Civil Engineering 14(2):1–14, DOI: https://doi.org/10.2478/tvsb-2014-0014
Allen RTL, Edwards SC, Shaw JDN (1974) The repair of concrete structures. The repair of concrete structures. Taylor and Francis Group, London, UK, 1–22
Branco FAB, Silva VD, Júlio ENBS (2005) Concrete-to-concrete bond strength: Influence of an epoxy-based bonding agent on a roughened substrate surface. Magazine of Concrete Research 57(8):463–468, DOI: https://doi.org/10.1680/macr.2005.57.8.463
Breveglieri M, Aprile A, Barros JAO (2014) Shear strengthening of reinforced concrete beams strengthened using embedded through section steel bars. {iEngineering Structures} 81:76–87, DOI: https://doi.org/10.1016/j.engstruct.2014.09.026
Cavaco E, Camara J (2017) Experimental research on the behaviour of concrete-to-concrete interfaces subjected to a combination of shear and bending moment. Engineering Structures 132:278–287, DOI: https://doi.org/10.1016/j.engstruct.2016.11.041
Cheng M, Ma J (2018) Experimental study on shear behavior of the interface between new and old concrete with reinforced. KSCE Journal of Civil Engineering 22(5):1882–1888, DOI: https://doi.org/10.1007/s12205-017-2007-6
Climaco JCTS, Regan PE (2001) Evaluation of bond strength between old and new concrete in structural repairs. Magazine of Concrete Research 53(6):377–390, DOI: https://doi.org/10.1680/macr.2001.53.6.377
Fakhruddin M, Nakamura T, Matsumoto K, Niwa J (2015) Shear behavior of RC interface for connecting the old and new slabs. The seventh regional symposium on infrastructure development (RSID 7), November 5–7, Bangkok, Thailand
GB 50010-2010 (2010) Code for design of concrete structures. GB 50010-2010, China Architecture and Building Press, Beijing, China (in Chinese)
Giurgiutiu V, Lyons J, Petrou M, Laub D, Whitley S (2001) Fracture mechanics testing of the bond between composite overlays and a concrete substrate. Journal of Adhesion Science and Technology 15(11):1351–1371, DOI: https://doi.org/10.1163/15685610152599386
Júlio ENBS, Branco FAB, Silva VD (2004) Concrete-to-concrete bond strength: Influence of the roughness of the substrate surface. Construction and Building Materials 18(9):675–681, DOI: https://doi.org/10.1016/j.conbuildmat.2004.04.023
Júlio ENBS, Branco FAB, Silva VD, Lourenco JF (2006) Influence of added concrete compressive strength on adhesion to an existing concrete substrate. Building and Environment 41(12):1934–1939, DOI: https://doi.org/10.1016/j.buildenv.2005.06.023
Júlio ENBS, Dias-da-Costa D, Branco FAB, Alfaiateb JMV (2010) Accuracy of design code expressions for estimating longitudinal shear strength of strengthening concrete overlays. Engineering Structures 32(8):2387–2393, DOI: https://doi.org/10.1016/j.engstruct.2010.04.013
Li G (2003) A new way to increase the long-term bond strength of new-to-old concrete by the use of fly ash. Cement and Concrete Research 33(6):799–806, DOI: https://doi.org/10.1016/S0008-8846(02)01064-5
Lv N, Li HM (2013) The research of several problems that merit attention in use of rebar-planting anchorage technique for reforming and strengthening buildings. Applied Mechanics and Materials 351–352:1333–1336, DOI: https://doi.org/10.4028/www.scientific.net/AMM.351-352.1333
Momayez A, Ehsani MR, Ramezanianpour AA, Rajaiea H (2005) Comparison of methods for evaluating bond strength between concretesubstrate and repair materials. Cement and Concrete Research 35(4):748–757, DOI: https://doi.org/10.1016/j.cemconres.2004.05.027
Nie JG, Wang YH, Zhang XG, Fan JS, Cai CS (2012) Mechanical behavior of composite joints for connecting existing concrete bridgesand steel-concrete composite beams. Journal of Constructional Steel Research 75(7):11–20, DOI: https://doi.org/10.1016/j.jcsr.2012.02.019
Niwa J, Fakhruddin M, Matsumoto K, Sato Y, Yamada M, Yamauchi T (2016) Experimental study on shear behavior of the interface between old and new deck slabs. Engineering Structures 126:278–291, DOI: https://doi.org/10.1016/j.engstruct.2016.07.063
Patnaik AK (2001) Behavior of composite concrete beams with smooth interface. Journal of Structural Enginering 127(4):359–366, DOI: https://doi.org/10.1061/(ASCE)0733-9445(2001)127:4(359)
Rahman R, Dirar S, Jemaa Y, Theofanous M (2018) Experimental behavior and design of reinforced concrete exterior beam-column joints strengthened with embedded bars. Journal of Composites for Construction 22(6):04018047, DOI: https://doi.org/10.1061/(ASCE)CC.1943-5614.0000883
Santos PMD, Júlio ENBS (2011) Factors affecting bond between new and old concrete. ACI Materials Journal 108(4):449–456
Santos P, Júlio E, Silva VD (2007) Correlation between concrete-to-concrete bond strength and the roughness of the substrate surface. Construction and Building Materials 21(8):1688–1695, DOI: https://doi.org/10.1016/j.conbuildmat.2006.05.044
Santos DS, Santos P, Dias-da-Costa D (2012) Effect of surface preparation and bonding agent on the concrete-to-concrete interface strength. Construction and Building Materials 37(37):102–110, DOI: https://doi.org/10.1016/j.conbuildmat.2012.07.028
Shin HC, Wan Z (2010) Interfacial shear bond strength between new and old concretes. 7th international conference on fracture mechanics of concrete and concrete structures (FraMCoS-7), May 23–25, Jeju, Korea
Suh J, Kim CG, Park HG, Hong GH, Kang SM (2015) Horizontal shear strength on various PC types of composite beams. The 2015 word congress on advances in structural engineering and mechanics, August 25–29, Incheon, Korea
Wang H, Zhang X, Jia L, Xia F (2011) Experimental study on mechanicalbehaviors of column underpinning joints under the influence of shear-span ratio of the underpinning beam. Engineering Mechanics(S2):192–197 (in Chinese)
Xu YL, Shao ZM, Shen WD (1988) Bond strength between reinforcing bars and concrete. Building Science (4):8–14 (in Chinese)
Acknowledgements
The work reported in this paper was financially supported by Sub-project of the National Key Research and Development Program of China (No. 2017YFC1501204) and the National Natural Science Foundation of China (Nos. U1804137/51879243/51608489/ 51708511).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wang, XL., Jin, LL., Li, K. et al. Experimental Study on Interfacial Shear Performance of RC Beams Added to Existing RC Columns. KSCE J Civ Eng 24, 3388–3396 (2020). https://doi.org/10.1007/s12205-020-2362-6
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12205-020-2362-6