Strengthening of pre-cracked RC beams at Shear region using carbon fiber reinforced polymer

• Main Authors: Islam, S. M. Zahurul, Ahmed, Bulbul, Islam, Md. Mohayminul, Zaman, Md. Tanvir, Nisat, Md. Nazmul Hasan, Rakib, Md. Mahade Hasan, Ayatulla, Md
• Format: Conference Proceeding
• Language: English
• Subjects: Bearing strength; Carbon fiber reinforced plastics; Carbon fiber reinforcement; Composite materials; Concrete structures; Debonding; Earthquake damage; Failure modes; Fiber reinforced polymers; Geological faults; Load carrying capacity; Overloading; Reinforced concrete; Shear; Strengthening
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0130405

Carbon Fiber Reinforced Polymer (CFRP) is one of the most promising composite materials for strengthening of reinforced concrete structures. Shear failure is a common phenomenon in Reinforced Concrete (RC) beam due to seismic action, design, and construction faults, change in application and implementation, damage for overloading and corrosion. The objective of this research is to investigate the shear behavior of pre-cracked RC beams strengthened using CFRP. A series of tests have been conducted to strengthen the RC beam by CFRP. Nine RC beams including one reference beam and another eight initially cracked beam were tested in this study with varying different CFRP length. Hydraulic controlled universal testing machine was used for four-point loading system. The failure loads, failure modes and the load-deformation behavior of reference beam and CFRP strengthen beam were also presented in this paper. Reference RC beams were failed by common shear pattern while initially cracked CFRP strengthened RC beams were failed at the middle of beam and interfacial debonding. Mainly, debonding failure was observed at ultimate loading conditions. Strengthening of pre-cracked RC beams at shear region using CFRP was provided better performance than reference beam. Based on test results, it was found that the structural performance of CFRP strengthening pre-cracked RC beam is significant than reference RC beam. The load carrying capacity improved significantly and varied 14.36%-39.06% for different strengthening technique. Therefore, it can be concluded that the better performance can be attained by CFRP strengthening in shear region damaged RC beam with appropriate technique.