Influence of Skew Angle on Reinforced Concrete Slab Bridges

Menassa, Carol C.; Mabsout, Mounir; Tarhini, Kassim; Frederick, Gerald R.

doi:10.1061/(asce)1084-0702(2007)12:2(205)

Cited by 54 publications

(23 citation statements)

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“…Finally, transverse and secondary moments can develop in skewed slab bridges, and no guidance on their magnitude is given in bridge codes. Menassa et al (2007) concluded on the flexural behavior of skewed slabs that the decrease in longitudinal moments with a higher skew angle is offset by the transverse-moment increase. They recommend a three-dimensional finite-element analysis for skew angles beyond 20°.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Straight and Skewed Slab Bridges

2012

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Results of an investigation aimed at determining bending moments and shear forces, required to design skewed concrete slab bridges using the equivalent-beam method are presented in this paper. Straight and skewed slab bridges were modeled using grillage and finite-element models to characterize their behavior under uniform and moving loads with the objective of determining the most appropriate modeling approach for design. A parametric study was carried out on 390 simply supported slabs with geometries covering one to four lane bridges of 3-to 20-m spans and with skew angles ranging from 0 to 60°. The analyses showed that nonorthogonal grillages satisfactorily predict the amplitude and the transverse distribution of longitudinal bending moments and shear forces, and can be used for the analysis of skewed slab bridges. Results of the parametric study indicated that shear forces and secondary bending moments increase with increasing skew angle while longitudinal bending moments diminish. Equations are proposed to include, as part of the equivalent-beam method for skew angles up to 60°, the increase of shear forces and the reduction of longitudinal bending moments. Equations are also given for computing secondary bending moments. A simplified approach aimed at determining the corner forces for straight and skewed bridges is proposed as an alternative to a more-refined analysis. The analyses indicated the presence of high vertical shear stresses in the vicinity of free edges that justifies suggesting to provide shear reinforcement along the slab free edges.

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Section: Introductionmentioning

confidence: 99%

Analysis and Design of Straight and Skewed Slab Bridges

2012

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“…These factors have been determined based on a parameter study with linear finite element models. A similar approach, but leading to different factors, is available from Canada (Theoret, Massicotte, & Conciatori, 2012) and similar studies have been carried out in the United States (Menassa, Mabsout, Tarhini, & Frederick, 2007). The number of experiments available in the literature is very limited (R. J. ; R.J. Cope, Rao, & Edwards, 1983;Cusens, 1987), and a first conclusion of these experiments is that the failure mode changes as the skew angle increases and the position of the wheel prints is kept unchanged.…”

Section: Shear Capacitymentioning

confidence: 99%

Collapse test and moment capacity of the Ruytenschildt reinforced concrete slab bridge

Lantsoght

Veen

Boer

et al. 2016

Structure and Infrastructure Engineering

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“…More sophisticated 3D models using the shell and beam elements are also proposed to study this subject [6,12,9,13,14,15]. Regarding the behavior of the skew bridges under the traffic loads, the most of the work about this subject has been performed on the FE models using the combination of shell and beam elements and assisted by experimental testing [16,17,18,19,20,21]. The FE models give a good approximation but require the end user more effort to introduce information in modelling the structure such as element types and sizes, dimension, material properties, connection types, etc.…”

Section: Introductionmentioning

confidence: 99%

Analytical and simplified models for dynamic analysis of short skew bridges under moving loads

Nguyen

Ruigómez

2019

Advances in Structural Engineering

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Skew bridges are common in highways and railway lines when non perpendicular crossings are encountered. The structural effect of skewness is an additional torsion on the bridge deck which may have a considerable effect, making its analysis and design more complex. In this paper, an analytical model following 3D beam theory is firstly derived in order to evaluate the dynamic response of skew bridges under moving loads. Following, a simplified 2D model is also considered which includes only vertical beam bending. The natural frequencies, eigenmodes and orthogonality relationships are determined from the boundary conditions. The dynamic response is determined in time domain by using the "exact" integration. Both models are validated through some numerical examples by comparing with the results obtained by 3D FE models. A parametric study is performed with the simplified model in order to identify parameters that significantly influence the vertical dynamic response of the skew bridge under traffic loads. The results show that the grade of skewness has an important influence on the vertical displacement, but hardly on the vertical acceleration of the bridge. The torsional stiffness really has effect on the vertical displacement when the skew angle is large. The span length reduces the skewness effect on the dynamic behavior of the skew bridge.

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Influence of Skew Angle on Reinforced Concrete Slab Bridges

Cited by 54 publications

References 1 publication

Analysis and Design of Straight and Skewed Slab Bridges

Analysis and Design of Straight and Skewed Slab Bridges

Collapse test and moment capacity of the Ruytenschildt reinforced concrete slab bridge

Analytical and simplified models for dynamic analysis of short skew bridges under moving loads

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