Title: Size Effect on Stress-Strain Model of Carbon Fiber- Reinforced Polymer Transverse Steel Reinforcement- Confined Concrete

Author(s): Yun Tian, Jikai Zhou, Fengtong Bi, and Xiyao Zhao

Publication: Structural Journal

Volume: 119

Issue: 4

Appears on pages(s): 85-95

Keywords: carbon fiber-reinforced polymer; reinforced concrete cylinders; size effect; stress-strain model; transverse steel reinforcement

DOI: 10.14359/51734654

Date: 7/1/2022

Abstract:
The stress-strain relationship of concrete with carbon fiber-reinforced polymer (CFRP) and transverse steel reinforcement (TSR) is characterized by size effect. Uniaxial compression tests of CFRP-TSR-confined reinforced concrete cylinders in different sizes under different confinements were carried out. It was found that the stress-strain relationship of CFRP-TSR-confined reinforced concrete has a noticeable size effect and constraint effect. The deformation capacity of confined concrete improves with the increase of constraint. When the specimen size is small, ductility improvement is more evident due to the constraint effect. The confining effect of CFRP and TSR cannot be linearly superimposed, and the interaction must be considered to reflect the enhanced development of the combined constraint. A stress-strain model of CFRP-TSR-confined reinforced concrete considering size effect is proposed. It has been proven to be applicable for single CFRP or TSR-confined conditions and verified by existing literature data.