Optimization of oblique Angle Design of Abutments and piers, and piers Shape of Continuous Prestressed Concrete Box Girder Bridges: Static Analysis part 1
Ali Fadhil Naser
Dr. Ali Fadhil Naser,  Ministry of Higher Education & Scientific Research , Foundation of Technical Education, Al-Mussaib Technical College, Iraq.
Manuscript received on March 29, 2014. | Revised Manuscript received on April 12, 2014. | Manuscript published on April 30, 2014. | PP: 113-121  | Volume-3, Issue-4, April 2014. | Retrieval Number:  D2901043414/2013©BEIESP

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Abstract: Skewed bridges are normally used to cross roadways, waterways, or railways that are not perpendicular to the bridge structure at the intersection. It is required when it is often not possible to arrange that a bridge spans square to the feature that it crosses, particularly where it is important to maintain a relatively straight alignment of a roadway above or below the bridge. The pier shape has important effect on the structural performance of the bridge structure according to the location conditions. The main aims of this study are to select the optimal design of piers shape and skew angles in the prestressed box girder bridge, to study the effects of pier shape and skew angles on the static structural responses. There are 120 bridge model are used in this study. FEM of SAP2000 Ver. 14.0.2 is used in the analysis. The results of structural analysis show that the pier shape and skew angle has significant effects on the static responses of the bridge structure. For vertical displacement, the optimal models are skew angle of bridge structure is range from 36 degree to 54 degree and the solid rectangular pier (skew abutments and skew piers). The models of two square piers (skew abutments and without skew piers) and 48 skew angle is the optimal models for bending moment. For tensile stress, the model of skew angle 48 degree and the model of solid rectangular pier (skew abutments and skew piers) is the optimal model. It can be concluded that the skewed models gives good results than straight model.
Keywords: Bridge, Box girder, Bending moment, Vertical displacement.