Title:
Investigating the Bend Strength of CFRP Spirals in Reinforced Concrete Elements
Author(s):
Acuna
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/23/2024
Abstract:
Fiber-Reinforced Polymer (FRP) materials represent a promising alternative to traditional steel reinforcement in reinforced concrete (RC) structures. While FRP bars exhibit perfect elasticity, their inability to be bent post-production requires careful consideration of manufacturing-induced bends. This study focuses on the often-overlooked impact of stirrup bends, specifically those made of carbon fibers (CFRP), when used as transverse reinforcement. Current industry practices often report the strength of CFRP stirrups based solely on their straight portions, disregarding the influence of the stirrup bend. This research addresses this gap by presenting the findings of 40 experimental tests conducted on 20x20 in. CFRP spiral bends, conforming to ASTM D7914. These results are then compared with direct tensile tests conducted on the straight portions, adhering to ASTM D7205. Preliminary data indicates that the strength of the bend can be as low as 30% of the straight portion, emphasizing the importance of considering this factor in the design process.