ANALYSIS OF POST-TENSIONED BEAMS STRENGTHENED BY CFRP FOR FLEXURE

Roopa K.M., Jagannatha Reddy

Abstract: Pre-stressing is generally having more application in long span bridges. Repair or upgradation is done for Pre-stressed concrete structures to increase their load carrying capacity, stiffness to conquer the loss of Pre-stressing force due to construction and moving load. Since bridges cannot be reconstructed or replaced completely, repair and retrofitting is more suitable. In this experiment four number of Post-tensioned beams were cast to study the effect of Carbon Fiber Reinforced Polymer (CFRP) strengthened beams under flexural behavior. With different wrapping technique using CFRP Sheets parameters like deflection, ultimate load carrying capacity and pattern of cracking are also studied under static loading. CFRP were wrapped with full Ustripped for one beam, full U-Wrapping for one beam and another beam wrapped for soffit of beam by using technique called wetlay-up. Remaining one beam is considered as Control beam and compared with the strengthened beams. From the result of experimental work, it has shown that ultimate load carrying capacity and crack strength has been enhanced.

Keywords: CFRP, Flexure, Post-tensioned, Strengthening beams

DOI: https://doi.org/10.15623/ijret.2016.0507013