Experimental and Numerical Study on the Effect of Logitudinal Reinforcment Debonding at Beam-Column Connections

Authors

Faculty of Civil Engineering, University of Urmia, Urmia 5756151818, Iran

10.22034/ceej.2024.61245.2350

Abstract

     In concrete beams, plastic hinges form at the beam-column connections, playing a crucial role in providing the required ductility. Due to the high stress and strain in this area, failure typically initiates as flexural and flexural-shear cracks. High-rise concrete beams are prone to single cracks in the critical region, reducing the plastic hinge length. Additionally, the longitudinal strains applied to the reinforcement in this area are high, leading to the buckling of the longitudinal reinforcement. This study aims to improve the behavior of high-rise reinforced concrete beams under cyclic loading by introducing a rubber sheath to separate the reinforcement and concrete at the plastic hinge. Full-scale specimens were tested under cyclic loading and numerically analyzed. The primary goal is to enhance the behavior of high-rise reinforced concrete beams under cyclic loading by using a rubber sheath to separate the reinforcement and concrete. The rubber sheath separation not only improved shear behavior but also reduced crack width. The number of cracks and the extent of damage at the end of the test were significantly reduced in the concrete specimen with the rubber sheath. This reduction in damage increases structural safety and reduces repair costs after events such as earthquakes. In the final part of this study, a finite element model was developed, and modeling parameters in the reinforcement-concrete interaction models were examined to achieve a numerical model with results close to the experimental tests conducted in the laboratory.

Keywords

Main Subjects

References

Asgarpoor M, Gharavi A, Epackachi S, “Investigation of various concrete materials to simulate seismic response of RC structures. Structures, 2021, 29, 1322-1351. https://doi.org/10.1016/j.istruc.2020.11.042
Bao Y, Lew HS, Sadek F, Main J, “A simple means for reducing the risk of progressive collapse”, Concrete international, 2013, 35, 33-38. https://doi.org/10.1061/9780784413357.194
Bigaj A, Walraven J, “Size effects in plastic hinges of reinforced concrete members”, Heron, 2002, 47 (2), 79-80.
Broadhouse B, Neilson A, “Modelling reinforced concrete structures in Dyna3d”, Ukaea Atomic Energy Establishment, 1987.
Committee A, “Building code requirements for structural concrete (ACI 318-08) and commentary”, American Concrete Institute, 2008. https://doi.org/10.1201/9781420007657-41
Erhart T, “Tips and tricks for successful implicit analyses with LS-DYNA”, Dynamore GmbH, 2016.
Grassl P, Jirásek M, “Damage-plastic model for concrete failure”, International Journal of Solids and Structures, 2006, 43, 7166-7196. https://doi.org/10.1016/j.ijsolstr.2006.06.032
Hallquist JO, “LS-DYNA® keyword user’s manual: volumes I, II, and III LSDYNA R11”, Livermore, California: Livermore Software Technology Corporation, Livermore, 2018.
INSO Standard Specification for Ready-Mixed Concrete. Iran, 2016.
Jeppsson J, Thelandersson S, “Behavior of reinforced concrete beams with loss of bond at longitudinal reinforcement”, Journal of Structural Engineering, 2003, 129, 1376-1383. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:10(1376)
Kani G, “The riddle of shear failure and its solution”, ACI Journal Proceedings, 1964, 61, 441-468.
Kotsovos GM, Vougioukas E, Kotsovos MD, “Reducing steel congestion without violating seismic performance requirements”, ACI Structural Journal, 2013, 110, 427-436. https://doi.org/10.14359/51685600
Massone LM, López EE, “Modeling of reinforcement global buckling in RC elements”, Engineering Structures, 2014, 59, 484-494. https://doi.org/10.1016/j.engstruct.2013.11.015
Organization INS, “Hot-rolled steel bars for reinforcement of concrete-Specification and test methods (INSO 3132)”, Islamic Republic of Iran, 2013.
Ottosen NS, “A failure criterion for concrete”, Journal of the Engineering Mechanics Division, 1977, 103, 527-535. https://doi.org/10.1061/jmcea3.0002248
Panagiotou M, “Effect of hoop reinforcement spacing on the cyclic response of large reinforced concrete special moment frame beams”, Pacific Earthquake Engineering Research Center, 2013. https://dx.doi.org/10.14359/51740244
Pandey GR, “Enhancing shear capacity by controlling bond of reinforcement”, Proceedings of the Japan Concrete Institute, 2005, 27, 799-804.
Pathy S, Borrvall T, “Quasi-static simulations using implicit LS-DYNA”, 14th International LS-DYNA Users Conference, 2016 Detroit, MI, USA. 12-14.
Qu Y, Wu H, Xu Z, Liu X, Dong Z, Fang Q, “Safety assessment of generation III nuclear power plant buildings subjected to commercial aircraft crash Part II: Structural damage and vibrations”, Nuclear Engineering and Technology, 52, 397-416. https://doi.org/10.1016/j.net.2019.07.015
Ranasinghe K, Ashraf M, “Effect of bond on shear behavior of RC and PC beams: Experiments and FEM analysis”, Japan Concrete Institute, 2001, 23, 1057-1062.
SchwER L, “The Winfrith concrete model: Beauty or beast? Insights into the Winfrith concrete model”, 8th European LS-DYNA users conference, 2011, 23-24.
Schwer L, “Modeling rebar: The forgotten sister in reinforced concrete modeling”, 13th International LS-DYNA® Users Conference, 2014.
Takahashi Y, “Development of high seismic performance RC piers with object-oriented structural analysis”,  2002.
Takiguchi K, Okada K, Sakai M, “Deforming Characteristics of RC Members with and without Bond”, Transactions of the Architectural Institute of Japan, 1976, 249, 1-11. https://doi.org/10.3130/aijsaxx.249.0_1
Wang Z, Feng P, Zhao Y, Yu T, “FRP-confined concrete core-encased rebar for RC columns: Concept and axial compressive behavior”, Composite Structures, 2019, 222, 110915. https://doi.org/10.1016/j.compstruct.2019.110915
Winkelbauer BJ, Phase I Evaluation of Selected Concrete Material Models in LS-DYNA, 2015.
Wittmann F, Rokugo K, Brühwiler E, Mihashi H, Simonin P, “Fracture energy and strain softening of concrete as determined by means of compact tension specimens”, Materials and structures, 1988, 21, 21-32. https://doi.org/10.1007/bf02472525
Zhao M-Z, Lehman DE, Roeder CW, “Modeling recommendations for RC and CFST sections in LS-Dyna including bond slip”, Engineering Structures, 2021, 229, 111612. https://doi.org/10.1016/j.engstruct.2020.111612
Journal of Civil and Environmental Engineering
Volume 55, Issue 118 - Serial Number 118
Spring 2025
June 2025
Pages 107-123

Files

Share

How to cite

Statistics