Torsion Strengthening of RC Beams with External Lateral Pressure Using Steel Plates
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RESEARCH PAPER
Torsion Strengthening of RC Beams with External Lateral Pressure Using Steel Plates Khaled Fawzy1 · Mohamed A. Farouk2 Received: 28 November 2019 / Accepted: 4 November 2020 © Shiraz University 2020
Abstract A few procedures and techniques have been created for strengthening RC beams in bridges to update torsional strength. In this paper, an experimental investigation is directed on the enhancement of the torsional resistance of the RC beams by applying external lateral pressure along their spans through four angles arranged around the beam corners and associated with each other by welded steel strips. Eleven beams were exposed to pure torsional moment to study the behavior and performance of the strengthening RC beams. The fundamental studied parameters were the pressure intensities and their direction. The torque and the twist angle of the beams were recorded for different sidelong pressure amounts and their guidelines. The RC beams were modeled using the finite element method and analyzed (software program ANSYS-19) for comparison with the experimental work results. Results show substantial increase in the torsional efficiency using sidelong pressure of RC beams. Test beams that were strengthened with sidelong pressure in breadth direction showed better enhancement in the ultimate torsional moment as opposed to the beams that were strengthened with the same pressure in depth direction. Keywords RC beam · Strengthening · Torsion · Pressure · Finite element
1 Introduction Many structures are in need of some kind of rehabilitation and strengthening to overcome their deterioration that increases with time. Poor-quality construction materials, overload of structures, change in design code regulations, reinforcement corrosions and seismic loads can cause serious deterioration of existing structures. For economical consideration especially in bridges, it is more cost-effective to rehabilitate the deficient structures before replacement. Strengthening is often an essential portion to overcome an unsatisfactory poor situation. Torsion moments may be a governing factor in the design; these cases may include spandrel beams, edge beam carrying cantilever stair and curved beams in bridges. Owing to the difficulties in carrying out * Mohamed A. Farouk [email protected] Khaled Fawzy [email protected] 1
Civil Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt
Civil Engineering Department, Faculty of Engineering, Delta University for Science and Technology, Belkas, Egypt
2
practical experiments and reprehensive analyses, the study of torsional reinforcement of the structural elements did not get much attention. A research model test based on the Updated Compression Field Principle (MCFT) for the loading case of combination flexure and torsion in reinforced and prestressed concrete beams was predicated (Khaldoun and Michael 2003). Karayannis and Chalioris (2000) used a bilinear stress–strain relationship with a post-cracking tension softening branch for study a
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