Parametric Study of the Effect of Cross-Frames on the Behaviour of Composite Steel-Concrete Girders Curved in Plan and Constructed with Shoring (original) (raw)
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The study of bridges in general and composite box girder bridges in particular, requires considerably more information than is contained in codes. A sound understanding of bridge behavior at all stages of loading is essential. Analysis and design of composite box girder bridges is complicated by many factors including composite interaction between the concrete deck and steel girder, local buckling of the thin steel walls making up the box, torsional warping, interaction between different kinds of cross-sectional forces, and the effect of horizontal bridge curvature on both local and global behavior. The aim of this article is to present a detailed description and explanation of the behavior of composite box girder bridge at several types of loading and under variety conditions. The present research addresses comparison using solid and shell element models of the composite box girder bridge. This task involves examining the stress patterns obtained using static three-dimensional finite element modeling. Comparisons made between stresses obtained for the composite box girder bridges according to many changes in the dimensions of the bridge. In the current study, composite boxes girder bridges analyzed with solid and shell elements using three dimensional finite element analyses and their behavior is investigated. Finally, the parametric investigations are performed on the composite box girder model to evaluate the effects of several important parameters on the behavior of the girder. The results from this study would enable bridge engineers to design composite box girder bridges more reliably and economically. ABSTRACT The study of bridges in general and composite box girder bridges in particular, requires considerably more information than is contained in codes. A sound understanding of bridge behavior at all stages of loading is essential. Analysis and design of composite box girder bridges is complicated by many factors including composite interaction between the concrete deck and steel girder, local buckling of the thin steel walls making up the box, torsional warping, interaction between different kinds of cross-sectional forces, and the effect of horizontal bridge curvature on both local and global behavior. A computer program depended on finite element method for simulating the behavior of composite box girders is used. The bridges are modeled as three-dimensional structures using commercially available software. The parameters considered in the study include types of cross section, locations, and magnitudes of loads; elements types, flanges width. The aim of this article is to present a detailed description and explanation of the behavior of composite box girder bridge at several types of loading and under variety conditions. The present research addresses comparison using solid and shell element models of the composite box girder bridge. This task involves examining the stress patterns obtained using static three-dimensional finite element modeling. Comparisons are made between stresses obtained for the composite box girder bridges according to many changes in the dimensions of the bridge. In the current study, composite boxes girder bridges are analyzed with solid and shell elements using three dimensional finite element analyses and their behavior is investigated. Finally, the parametric investigations are performed on the composite box girder model to evaluate the effects of several important parameters on the behavior of the girder. The results from this study would enable bridge engineers to design composite box girder bridges more reliably and economically.
Comparative Experimental Study of Behaviour for Straight and Horizontally Curved Composite Bridges
University of Khartoum Engineering Journal, 2019
GEOMETRIC, aesthetic, and economic considerations have led to the increased use of horizontally curved girders for highway bridges and interchange facilities which involve curved alignment. The current paper investigates the behavior of steel-concrete curved composite bridges. An experimental program was conducted to investigate the behavior of steel-concrete composite curved and straight bridges, through the comparison of the deflection and longitudinal slippage at failure state of the specimens under static load. Three different specimens were built, two were horizontally curved; one of the curved specimens with full interaction, while the other with partial interaction between the concrete and the steel girders, and the third one was straight. Each specimen has three I-girders acted parallel connected with X shape cross frames. All specimens dimension scaled as 1/10 in both length and radius of curvature, of Federal Highway Administration (FHWA) full scale model. The Models were ...