Experimental and numerical programs were carried out to study the Girder Distribution Factors (GDF) for the curved steel I-Girder bridges under Iraqi Standard bridge live loads, the dimension of the five simply supported bridge models was scaled down by (1/10) from full scale simply supported of 30m central span, which was designed according to AASHTO LRFD 2012 [1]. The model central span is 3.0 m and the carriageway central radii are 30 m, 15m or 10m. Girder spacing of the first two models is 175 mm with an overall carriageway width of 650mm. Girder spacing of the other three bridge models is 200mm with the overall carriageway width of 700 mm. Overall depth of the composite section was 164 mm, these models manufacturing and testing under Iraqi Standard bridge live loads and the experimental results show that the curvature has a significant effect, while the girder spacing has a little effect on GDF. AASHTO 1993 method were conservative comparing with the experimental results, while there is a good convergence with Courbon’s method. The ANSYS Worckbench 14.5 commercial software was adopted to build up the Finite Element model. Results have shown that the numerical model was slightly stiffer than the experimental test bridge model. A good agreement was obtained between the numerical and experimental results in estimating the GDF under Iraqi Standard bridge live loads for all models.
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