Reliability-based design provisions for flexural strength of fiber-reinforced polymer prestressed concrete bridge girders

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, ß T = 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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  • English

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  • Accession Number: 01715665
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 9 2019 4:22PM