Title: Size Effect on Strength of Reinforced Concrete Cylinders Confined by Carbon Fiber-Reinforced Polymer and Transverse Stirrup Reinforcement

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

Publication: Structural Journal

Volume: 118

Issue: 2

Appears on pages(s): 263-272

Keywords: bearing capacity; carbon fiber-reinforced polymer; reinforced concrete cylinders; size effect; transverse stirrup reinforcement

DOI: 10.14359/51729357

Date: 3/1/2021

Abstract:
The objective of this paper is to understand the influence of size effect on the bearing capacity of reinforced concrete (RC) cylinders confined by carbon fiber-reinforced polymer (CFRP) and transverse stirrup reinforcement (TSR). The uniaxial compression tests of CFRP-TSR-confined RC cylinders in different sizes (150, 190, and 240 mm [5.910, 7.486, and 9.456 in.]) under different confinements (CFRP sheets of one, two, and three layers, and TSR of 1.54% and 2.31% ratio) were conducted. From the test results, it can be found that the larger the diameter of RC cylinders, the more obvious the size effect of the bearing capacity, and the impact of CFRP on size effect is far higher than that of TSR. Without considering size effect, the uniaxial compression bearing capacity of the large-size specimens can be overestimated. Therefore, a compressive strength model and a bearing capacity design equation of CFRP-TSR-confined RC cylinders considering size effect are established.