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

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Title: Spatial time-dependent reliability analysis of reinforced concrete slab bridges subject to realistic traffic
Authors: Hajializadeh, Donya
Stewart, Mark G.
Enright, Bernard
O'Brien, Eugene J.
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Date: 2016
Abstract: 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 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 (WIM) 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 paper, a 2-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 are strongly correlated, the combined influence of correlation in load and resistance on probability of failure is small.
Funding Details: European Commission - Seventh Framework Programme (FP7)
Type of material: Journal Article
Publisher: Taylor and Francis
Journal: Structure and Infrastructure Engineering
Volume: 12
Issue: 9
Start page: 1137
End page: 1152
Copyright (published version): 2016 Taylor and Francis
Keywords: Slab bridgesTraffic loadingCorrosionTime-dependent reliability analysisCorrelationSpatial variabilityRandom field modelling
DOI: 10.1080/15732479.2015.1086385
Language: en
Status of Item: Peer reviewed 2016-10-13T12:16:06Z
Appears in Collections:Civil Engineering Research Collection

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