아웃케이블 공법을 적용한 프리스트레스 철근콘크리트 보의 휨보강 성능

Flexural Strengthening Capacities in Prestressed concrete Beams Applied to Outcable technique

A strengthening technique for reinforced concrete beams using external unhanded reinforcement offers advantages in speed and simplicity of installation over other, established, strengthening techniques. The purpose of this paper is to investigate the capabilities of a new retrofitting technique, namely external prestressing out cable, for flexural strengthening of beams. The paper provides a general description of structural behavior of beams strengthened using the technique. Results of four physical tests on strengthened reinforced concrete beams are reported and compared. It is shown that the technique can provide greater strength enhancement to lightly reinforced sections and that provision of deflectors enhances efficiency.