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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Reliability-Based Design Provisions for Flexural Strength of Fiber-Reinforced Polymer Prestressed Concrete Bridge Girders
Author(s): Fei Peng and Weichen Xue
Publication: Structural Journal
Appears on pages(s): 251-260
Keywords: bridge girders; fiber-reinforced polymers (FRP); prestressed concrete; reliability; strength reduction factor; transition region
Abstract:This paper develops reliability-based design provisions for flexural strength of prestressed concrete bridge girders with bonded fiber-reinforced polymer (FRP) tendons, focusing on strength reduction factors and the transition region between tension-controlled and compression-controlled sections. First, a total of 48 bridge girders covering a wide range of design scenarios are considered to conduct stochastic simulation. Subsequently, the statistical parameters of resistance are evaluated based on Monte-Carlo simulation. Then, the first-order second-moment method is applied to calibrate strength reduction factors to meet a uniform target reliability level, βT = 3.5, specified in AASHTO LRFD. Finally, a probabilistic analysis of flexural failure modes is conducted to determine a transition region in terms of ratio of provided-to-balanced reinforcement (ρb < ρ ≤ 1.5ρb) instead of the traditional net tensile strain limits in ACI 440.4R-04. As a result, this study recommends strength reduction factors of 0.80 for tension-controlled sections, 0.85 for compression-controlled sections, and a linear variation in the transition region.
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