Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Experimental and Numerical Investigation of Cyclic Behavior of RC Beams Using Anti-buckling System of Wrapped Steel Sheet in Plastic Hinge Region

Document Type : Original Article

Authors
Amir Jabbari 1
Saeed Tariverdilo 2
Mohammad Reza Sheidaii 2
1 PhD Student, Structural Engineering, Department of Civil Engineering, Urmia University International Campus, Urmia, Iran
2 Professor, Engineering Faculty, Civil Engineering Department, Urmia University, Urmia, Iran
10.22065/jsce.2023.409497.3188
Abstract
In reinforced concrete moment frames, the plastic hinge regions of concrete beams provide most of the demanded deformations of the structure. That is why there are always strict rules regarding the distance between transverse reinforcements in different seismic design regulations, which makes them difficult to implement in the construction process. In the plastic hinge regions of the concrete beams with high heights, the main rebars with low diameter are prone to buckling under the effect of a low number of cyclic loads, which we know as low cycle fatigue. In this study, we introduced a new system to prevent the buckling of longitudinal reinforcements in the plastic hinges. Experimental and numerical studies were conducted on full-scale specimens with cyclic loading. The new system employs two bent steel sheets to prevent the buckling of longitudinal reinforcements and to improve the lateral restraint and ductility of the plastic hinge by confining the concrete core of the beam. The laboratory samples were two 5-meter specimens. Unlike the first sample, the second one used the anti-buckling system of the perforated sheet. The showed that the steel plate prevented the longitudinal reinforcement from buckling outward in the plastic hinges. The numerical models were analyzed using finite element software LS-Dyna, which confirmed the positive performance of this system.
Keywords
Buckling
Reinforced Concrete Beam
Plastic Hinge
Cyclic Behavior
Longitudinal Rebars

Subjects

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  • Receive Date 03 August 2023
  • Revise Date 08 October 2023
  • Accept Date 17 November 2023