Box girder, due to its high torsional stiffness, is very appropriate for railway and highway longmedium span bridges. This type of cross section, subjected to transversely non-uniform loads, present warping and distortion phenomena. Accurate but time-consuming numerical procedures are available for determination of further strains and stresses caused by cross-section deformation. In this paper warping and distortion of box girders is evaluated through BEF analogy, by writing a 4th order differential equation. The problem is solved for practical cases of box girders by considering internal diaphragms stiffness. Graphs are supplied to designers and main design parameters affecting cross section deformation are underlined. The proposed methodology is shown through the use of graphs by developing numerical examples on actual bridge girders.
BEF Analogy for Concrete Box Girder Analysis of Bridges
RECUPERO, Antonino
2010-01-01
Abstract
Box girder, due to its high torsional stiffness, is very appropriate for railway and highway longmedium span bridges. This type of cross section, subjected to transversely non-uniform loads, present warping and distortion phenomena. Accurate but time-consuming numerical procedures are available for determination of further strains and stresses caused by cross-section deformation. In this paper warping and distortion of box girders is evaluated through BEF analogy, by writing a 4th order differential equation. The problem is solved for practical cases of box girders by considering internal diaphragms stiffness. Graphs are supplied to designers and main design parameters affecting cross section deformation are underlined. The proposed methodology is shown through the use of graphs by developing numerical examples on actual bridge girders.Pubblicazioni consigliate
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