Title:
Dual Potential Capacity Model for Deep Reinforced Concrete Members Strengthened by Fiber-Reinforced Polymer Composites
Author(s):
Deuckhang Lee
Publication:
Structural Journal
Volume:
121
Issue:
6
Appears on pages(s):
33-46
Keywords:
ggregate interlock; composites; compression zone; deep beam; dual potential capacity model (DPCM); fiber-reinforced polymer (FRP); shear
DOI:
10.14359/51740853
Date:
11/1/2024
Abstract:
For the past several decades, there has been an ongoing academic
challenge to understand the shear-transfer mechanism in reinforced
concrete (RC) members, particularly in those with small
shear span-depth ratios, also known as deep beams. Analytical
uncertainty regarding shear strength inevitably increases when
those deep members are strengthened in shear using externally
bonded fiber-reinforced polymer (FRP) composites. This study
aims to investigate the complex, interrelated effects of short shear
span-depth ratios and FRP composites on RC deep beam members.
To this end, the fundamental formulations of the dual potential
capacity model (DPCM) are extended to RC deep members reinforced with externally bonded FRP composites. The proposed
model can consider the various types of FRP composites, fiber
bonding configurations, and fiber layouts, and various failure
modes of concrete and FRP reinforcements are also reflected. A
total of 131 shear test results of RC deep and short members with
externally bonded FRP composites are carefully collected, and
those are added to the existing database of RC slender members
strengthened with FRP composites. On this basis, the proposed
approach is verified by comparing test results with analysis results,
and a reasonable level of analytical accuracy is achieved. The
statistical data distribution of strength ratios between the test and
analytical results is consistent across a range of shear span-depth
ratios from approximately 0.7 to 4.0. Overall, the proposed DPCM
approach provides a useful tool for analyzing the shear strength of
RC deep beam members strengthened with externally bonded FRP
composites.