Document Type : Original Article
Authors
1
PhD Candidate, Department of Civil Engineering, Mahabad Branch, Islamic Azad University,Mahabad, Iran
2
Associate Professor, Department of Environmental Engineering, Urmia University of Technology, Urmia, Iran.
3
Assistant Professor, Department of Civil Engineering, Mahabad Branch Islamic Azad University, Mahabad, Iran
10.22065/jsce.2023.381530.3031
Abstract
Reinforced concrete shear walls have a wide range of applications as one of the main lateral load-bearing elements in the construction industry. Implementation constraints often require the use of longitudinal rebar lap-spliced. The presence of rebar lap-spliced allows for longitudinal rebar slippage in the connection zone, which, if it occurs, leads to a reduction in ductility and undesirable seismic performance of the wall. To further investigate this issue, after validating the numerical results with obtained previous laboratory experiments, the behavior of 24 wall models with different longitudinal rebar diameters, lap-spliced lengths, percentage of longitudinal rebar, and rebar debonding were studied numerically and using finite element analysis. The selected models, considering bond strength and slippage at the connection zone, were examined under gravity and cyclic lateral loading using numerical and finite element methods. By comparing the obtained results, including hysteretic curves, ductility, energy dissipation, rebar strain, and crack propagation, with walls using continuous rebar, it was demonstrated that the presence of lap-spliced in the wall causes rebar slippage in the connection zone. Additionally, in walls with 18mm and 20mm rebars diameter, ductility was reduced by approximately 2 times. The results indicated that the ductility of walls with lap-spliced can be increased by up to 50% using debonding methods.
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