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Title: Stochastic Finite Element Approach to Assess Reliability of Fiber-Reinforced Polymer-Strengthened Concrete Beams

Author(s): Connor Petrie and Fadi Oudah

Publication: Structural Journal

Volume: 120

Issue: 6

Appears on pages(s): 193-204

Keywords: fiber-reinforced polymer; random fields; reinforced concrete; reliability analysis; spatial variability; stochastic finite element

DOI: 10.14359/51739096

Date: 11/1/2023

This paper presents a novel framework to assess the reliability of externally bonded (EB) fiber-reinforced polymer (FRP)- strengthened steel-reinforced concrete (RC) beams by considering the spatial variation of concrete and concrete-FRP bond interface properties. The spatial variation is considered by developing resistance models using nonlinear stochastic finite element (FE) simulation, where the concrete properties are represented using three-dimensional (3-D) random fields and the concrete-FRP bond strengths are represented using two-dimensional (2-D) random fields. The framework was developed, automated, and applied to select configurations of RC beams strengthened using carbon FRP. A parametric analysis consisting of 3000 nonlinear stochastic FE models was performed to assess the effect of spatial variability on the reliability index of members designed using CSA S806, CSA S6, and ACI 440.2R. Analysis results verified the developed framework and indicated the sensitivity of analysis results to variations in the spatial properties of the considered beams.