Integral abutment bridges under thermal loading : numerical simulations and parametric study.
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2016-06-01
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Alternative Title:A report of the findings of ICT project R27-115 : analysis of superstructures of integral abutment bridges.
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Abstract:Integral abutment bridges (IABs) have become of interest due to their decreased construction and maintenance costs in
comparison to conventional jointed bridges. Most prior IAB research was related to substructure behavior, and, as a result, most
limit states that have been considered in design guidelines have been based on substructure considerations. However, integral
abutment construction also affects superstructure behavior and demands, and superstructure properties directly influence
substructure behavior. This report presents numerical simulations evaluating the behavior of IABs with composite steel I-girders
subjected to temperature changes consistent with seasonal fluctuations in the state of Illinois. Nonlinear bridge models are
introduced in which key parameters are varied, such as span length, pile size, and skew. Other parameters that were deemed of
less importance, like various pile and soil conditions, are studied as well. Three-dimensional finite element model results indicate
that longitudinal bridge movement is directly dependent on IAB effective expansion length (EEL), regardless of other bridge
design parameters. Structural responses such as girder superstructure elastic stress and pile substructure inelastic strain are
influenced by EEL, pile type and size, superstructure rotational stiffness, and bridge skew. Results presented herein suggest that
superstructure geometry—including bridge skew—should be considered in IAB substructure design and that thermally induced
stresses and strains should be considered in superstructure and substructure design.
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