Performance of Concrete Beam Strengthened with Prestressed Sprial Steel Wires

Abstract

In view of the defects and limitations of the existing reinforcement methods, it is necessary to put forward a reinforcement method with better interfacial bond performance, more convenient construction and economical reinforcement. A new reinforcement technique with prestressed spiral steel wires was presented, and one control beam, three strengthened beams under monotonic loading were tested. Under the same initial prestressing level, the amount of reinforcement and different groove sizes, the flexural capacity, load-deflection relationship, crack and deformation of reinforced concrete beams were systematically investigated. Results show that the reinforcement technique can significantly improve the first-crack load, steel-yielding load, ultimate load of the beams, and improve the service performance of the strengthened beams. The high performance of the spiral steel wires is allowed for better utilization. The conclusions obtained in the study are of important reference value to direct the similar engineering practice.