Reliability-Based Design Provisions for Flexural Strength of Fiber-Reinforced Polymer Prestressed Concrete Bridge Girders

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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

Volume: 116

Issue: 1

Appears on pages(s): 251-260

Keywords: bridge girders; fiber-reinforced polymers (FRP); prestressed concrete; reliability; strength reduction factor; transition region

Date: 1/1/2019

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.