Title:
Dual Potential Capacity Model for FRP-Reinforced Concrete Members Failed in Shear (Prepublished)
Author(s):
Deuckhang Lee and Min-Kook Park
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
aggregate interlock; compression zone; dual potential capacity model; fiber reinforced polymer; FRP bar; FRP stirrup; shear
DOI:
10.14359/51743307
Date:
10/10/2024
Abstract:
Fiber-reinforced polymer (FRP) reinforcements have been utilized in versatile forms to enhance durability performance and consequently to attain longevity of concrete structures in recent construction practices. The shear strength of FRP-reinforced concrete (FRP-RC) beams holds significant importance in structural design. However, there exists inherent analytical uncertainty concerning shear in concrete members due to the distinctive material characteristics of FRP bars compared to conventional steel reinforcements, such as their low axial stiffness and bond properties. This study aims to identify the shear resistance mechanisms developed under combined actions between concrete and FRP reinforcements. To this end, the dual potential capacity model (DPCM) is extended to FRP-RC beam members subjected to shear and flexure, and an attempt was also made to derive a simplified method. To validate the proposed approaches, a total of 437 shear test results from RC members incorporating FRP bars were utilized. Findings indicate that the proposed methods can provide an acceptable level of analytical accuracy. In addition, a significant shift in the shear failure mode of FRP-RC members with no stirrup was observed from the compression zone to the cracked tension zone as the FRP reinforcement ratios increased. Conversely, when FRP stirrups were added, the shear failure mode was mostly dominated by the compression zone.