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Spatial time-dependent reliability analysis of reinforced concrete slab bridges subject to realistic traffic loading

Hajializadeh, D., Stewart, M.G., Enright, B. and OBrien, E. (2015) Spatial time-dependent reliability analysis of reinforced concrete slab bridges subject to realistic traffic loading Structure and Infrastructure Engineering, 12 (9). pp. 1137-1152.

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Resistance and loads are often correlated in time and space. The paper assesses the influence of these correlations on structural reliability/probability of failure for a typical two-lane reinforced concrete (RC) slab bridge under realistic traffic loading. Spatial variables for structural resistance are cover and concrete compressive strength, which in turn affect the strength and chloride-induced corrosion of RC elements. Random variables include pit depth and model error. Correlation of weights between trucks in adjacent lanes and inter-vehicle gaps are also included and are calibrated against weigh-in-motion data. Reliability analysis of deteriorating bridges needs to incorporate uncertainties associated with parameters governing the deterioration process and loading. One of the major unanswered questions in the work carried out to date is the influence of spatial variability of load and resistance on failure probability. Spatial variability research carried out to date has been mainly focused on predicting the remaining lifetime of a corroding structure and spatial variability of material, dimensional and environmental properties. A major shortcoming in the work carried out to date is the lack of an allowance for the spatial variability of applied traffic loads. In this article, a two-dimensional (2D) random field is developed where load effects and time-dependent structural resistance are calculated for each segment in the field. The 2D spatial time-dependent reliability analysis of an RC slab bridge found that a spatially correlated resistance results in only a small increase in probability of failure. Despite the fact that load effect at points along the length of a bridge is strongly correlated, the combined influence of correlation in load and resistance on probability of failure is small. © 2015 Informa UK Limited, trading as Taylor & Francis Group.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Stewart, M.G.
Enright, B.
OBrien, E.
Date : 6 October 2015
DOI : 10.1080/15732479.2015.1086385
Copyright Disclaimer : Copyright 2015 Taylor & Francis
Uncontrolled Keywords : correlation, corrosion, random field modelling, Slab bridges, spatial variability, time-dependent reliability analysis, traffic loading, Compressive strength, Concrete slabs, Concretes, Correlation methods, Corrosion, Deterioration, Probability, Reinforced concrete, Reliability, Structural analysis, Traffic surveys, Uncertainty analysis, Random fields, Slab bridges, Spatial variability, Time dependent reliability analysis, Traffic loading, Reliability analysis
Depositing User : Diane Maxfield
Date Deposited : 21 Mar 2019 17:14
Last Modified : 21 Mar 2019 17:14

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