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
Abstract:
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.