United States Department of Transportation
i
Load Distribution on Highway Bridges Based on Field Test Data: Phase III
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1998-07-01
[PDF-5.51 MB]
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Abstract:The studies on wheel load distribution are carried out in three phases. Studies in Phase I were focused on straight slab-on-girder, solid slab, voided slab and double Tee bridges. The existing analytical and field load distribution methods were reviewed for different bridge types. The grillage analogy concepts were presented together with the cross sectional properties of different bridge types for grillage analogy idealization, field test procedures and methodologies. Several parameters such as span length, bridge width, slab thickness, edge beam and number of lanes are considered in the parametric studies of solid and voided slab bridges. One hundred sixty study cases were carried out to evaluate the various parameters affecting load distribution of slab-on-girder bridges. The load distribution factors from the analysis of double Tee simply supported bridges are compared with those based on the AASHTO and LRFD codes. The studies in Phase II were focused on wheel load distribution of the skew slab-on-girder and skew solid slab bridges. The various parameters affecting load distribution of skew simply supported slab-on-girder bridges were studied using finite element method and data from the field tests are used to verify the analytical results. Analytical and field studies on the wheel load distribution of skew simply supported solid slab bridges are presented and compared with those based on the AASHTO and LRFD codes. The finite element method and field test data were used to investigate the continuous skew and straight slab-on-I girder bridges and compute the corresponding wheel load distribution factors. The present studies in Phase III were mainly directed towards the analyses of comprehensive field test data, shear load distribution of continuous slab-on-girder bridges, and effects of diaphragms and shoulders on the wheel load distribution factors. The main parameters that affect shear load distribution are compared for single and multiple span bridges. The study on shear load distribution focuses on five main parameters: spacing between the girders, variation of skew angle, variation in the number of spans, ratio between adjacent two spans, and span length. The effect of diaphragms on wheel load distribution was first evaluated for a field test bridge and compared with a finite element model of the actual bridge. The diaphragm parameters that affect the wheel load distribution were studied to evaluate the effect of each parameter. The main conclusions based on the studies in Phases I, II, and III are presented in this report.
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