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

Articles in Press

Document Type : Original Article

Authors

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.

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Journal of Structural and Construction Engineering

Articles in Press, Accepted Manuscript
Available Online from 17 November 2023

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History

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

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