Title: Stiffness Reduction Factor for Slender Concrete Column Reinforced with Fiber-Reinforced Polymer Bars

Author(s): Fei Peng and Weichen Xue

Publication: Structural Journal

Volume: 120

Issue: 1

Appears on pages(s): 203-213

Keywords: column; effective flexural stiffness; fiber-reinforced polymer (FRP); reinforced concrete (RC); reliability analysis; slenderness effect; stiffness reduction factor

DOI: 10.14359/51737237

Date: 1/1/2023

Abstract:
North American technical committees are currently devoting enormous efforts to incorporating the design of concrete columns reinforced with fiber-reinforced polymer (FRP) bars in the upcoming edition of FRP-reinforced concrete (RC) structures design codes. This paper attempts to develop reliability-based design provisions for slender FRP-RC columns. Firstly, effective flexural stiffness equations of slender FRP-RC columns in the available technical literature were reviewed, and their model errors were evaluated based on a large experimental database of 160 slender columns. Subsequently, an analytical procedure based on Monte Carlo simulations was developed to perform a rigorous reliability analysis of slender FRP-RC columns. On this basis, sensitivity analyses were performed to examine the influence of various design parameters on the reliability index. The stiffness reduction factors were then calibrated to achieve a predetermined target reliability index. Finally, the stiffness reduction factors for slender FRP-RC columns were proposed in a convenient form for design procedures, depending on the effective flexural stiffness equation used.