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![Geometry of Curved Precast Concrete Girders Bridges. Alawneh et al. [3]](profile/Arthur-Reboucas/publication/357489226/figure/fig1/AS:11431281088162882@1664980845372/Geometry-of-Curved-Precast-Concrete-Girders-Bridges-Alawneh-et-al-3.png)
Source publication
The present study focuses on comparative parametric analysis of curved precast concrete bridges using straight and curved I-girders. The live load bending moment distribution for girders was studied using the bridge curvature and its relationship with the results obtained for a straight bridge. FEM 3D models were developed with restrictions on the...
Contexts in source publication
Context 1
... already mentioned, Alawneh [3] developed a methodology for the construction of precast concrete curved girders with straight sections connected in predefined positions to achieve the desired curvature. Figure 3 shows the proposed geometry. According to Cho et al. [5], the application of curvature in precast prestressed concrete girders is very advantageous, since the steel girders, mostly used in this type of curved layout, have low stiffness to warping. ...
Context 2
... the load 02 case for the straight bridge, it was found that approximately 25% of the total bending moment of the bridge was distributed for each of the girders, that is, there was an equal distribution. However, as shown in Figure 23, when we observed the studied curve bridge models the largest portion of the bending moment is intended for the external girder (G1), which corresponds to the studies of Kim et al. [7], Barr et al. [16] and Acosta et al. [14]. This probably occurs due to the eccentricity in relation to the center of gravity of the deck; the greater length of this girder in relation to the others, and the greater portion of area around its extension. ...
Context 3
... from Figure 23 it was observed that there was an increase in the portion of the bending moment in the outer girder with the increase in the curvature. In the curved bridge with lower L/R, for example, there was an increase of 4% in the bending moment in the outer girder, even with an increase in the total bending moment of only 2%. ...
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Citations
... In addition to the vertical constraint, the support at one end also constrains the tangential displacement, while the other extremity constrains tangential and radial displacements. Rebouças et al. [17] successfully applied these conditions in order to perform a similar analysis. ...
... Considering the influence of curvature, although the MF's in the central girders are not affected by the change of radius, the factors in the external girders increase while decreasing in the internal girders. This behavior is compatible with what was verified by Acosta and González [7] and Rebouças et al. [17]. Furthermore, regarding the widening stiffness, there are no relevant changes due to the variation of this parameter. ...
The study proposes to analyze the distribution of bending moment due to live load in curved bridges that have undergone a process of widening, considering the influence of concrete’s strength variation. The results show that the bending moment redistribution is more significant the higher the stiffness in the widenings. In addition, the redistribution induced by the variation of stiffness depends on the live load positioning but, generally, it results in the migration of bending moments to the stiffer regions, relieving the original girders. The curvature did not significantly alter the response induced by the stiffening of the widened segments. Also, the divergences found between the MEF and the V-load Method results for models with uniform and variable stiffness were similar. Finally, the Modification Factors (MF) proved to be more sensitive to the influence of curvature than to the concrete strength in the widenings.
