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.
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