กำลังเชิงดัดของการเสริมกำลังคานคอนกรีตเสริมเหล็กรับแรงดึง ด้วยแผ่นพอลิเมอร์เสริมเส้นใยคาร์บอนยึดติดจากภายนอก

Abstract

The undesired phenomenon of debonding failure initiated at the ends of the FRP plates can cause these bonded FRP plates to peel off before the design load is reached to the expected appropriate value. In this experimental study, it is concerned with the flexural response and strength capacity of the singly reinforced concrete beams strengthened by externally epoxy bonded carbon fiber-reinforced polymer (CFRP) plates together with providing plate-end wrapping on four sides of the beam section. The objective of the study has two-fold. The first is to investigate the load carrying capacity and deflection behavior of the beams and the second is to examine the effects of applied load position and concrete strength on the strengthened beams. The tested results are presented graphically in terms of load-deflection relationships. The first cracking load and the ultimate load for reinforced concrete beams are determined from both experiments and theoretical calculations. Furthermore, the yielding load and debonding load can be observed and obtained from the load-deflection relationships for control beams and strengthened beams, respectively.