Title: Stiffness Reduction Factor for Slender Concrete Column Reinforced with Fiber-Reinforced Polymer Bars
Author(s): Fei Peng, Weichen Xue
Publication: Structural Journal
Appears on pages(s):
Keywords: column; effective flexural stiffness; fiber–reinforced polymer (FRP); reinforced concrete; reliability analysis; slenderness effect; stiffness reduction factor
North American technical committees are currently devoting enormous efforts to incorporate 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 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 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.