Title:
Dual-Potential Capacity Model for Fiber-Reinforced Polymer-Reinforced Concrete Members Failed in Shear
Author(s):
Deuckhang Lee and Min-Kook Park
Publication:
Structural Journal
Volume:
122
Issue:
1
Appears on pages(s):
77-89
Keywords:
aggregate interlock; compression zone; dual potential capacity model; fiber reinforced polymer; FRP bar; FRP stirrup; shear
DOI:
10.14359/51743307
Date:
1/1/2025
Abstract:
Fiber-reinforced polymer (FRP) reinforcements have been used
in versatile forms in recent construction practices to enhance
durability performance and, consequently, to attain longevity of
concrete structures. The shear strength of FRP-reinforced concrete
(FRP-RC) beams holds significant importance in structural design.
However, inherent analytical uncertainty exists 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) was 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 used. 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 stirrups 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.