Search results for "Box girders"

showing 3 items of 3 documents

Interaction between Longitudinal Shear and Transverse Bending in Prestressed Concrete Box Girders

2017

In box girder bridges, the quantity and distribution of reinforcement to be put in concrete elements of sections can be evaluated only by considering the deformation of the cross section in addition to the longitudinal analysis of the static scheme, establishing the entire state of stress of box sections. This leads to a need to evaluate the interaction between internal forces obtained by the global analysis and the ones obtained by the local analysis of the cross sections. The frame effect implies the elastic deformation of slabs and webs, whereas eccentrically applied loads lead to cross-section distortion with the loss of the box shape. Hence, the reinforcement is strongly influenced by …

EngineeringTransverse bendingBox girders bridges0211 other engineering and technologies020101 civil engineering02 engineering and technologyPlasticity0201 civil engineeringlaw.inventionPrestressed concreteInteraction domainslawGirder021105 building & constructionReinforcementCivil and Structural Engineeringbusiness.industryBox girders bridges; Interaction domains; Prestressed concrete; Shear; Thin-walled section; Transverse bending; Web; Civil and Structural Engineering; Building and ConstructionShearBox girderBuilding and ConstructionStructural engineeringWebSettore ICAR/09 - Tecnica Delle CostruzioniThin-walled sectionStress resultantsBending momentPrestressed concreteDeformation (engineering)businessJournal of Bridge Engineering
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Evaluation of web reinforcements in prestressed concrete box girders through shear-transverse bending domains

2020

In concrete box girders, the amount and distribution of reinforcements in the webs have to be estimated considering the local effects due to eccentric external loads and cross-sectional distortion and not only the global effect due to the resultant forces of a longitudinal analysis: shear, torsion and bending. This work presents an analytical model that allows designers to take into account the interaction of all these effects, global and local, for the determination of the reinforcements. The model is based on the theory of stress fields and it has been compared to a 3D finite element analysis, in order to validate the interaction domains. The results show how the proposed analytical mode…

thin-walled section0211 other engineering and technologies020101 civil engineeringbox girders bridges; interaction domains; prestressed concrete; shear; thin-walled section; transverse bending; web reinforcement02 engineering and technologyshear0201 civil engineeringlaw.inventionPrestressed concretelawGirder021105 building & constructionbox girders bridgesReinforcementCivil and Structural Engineeringinteraction domainsbusiness.industryprestressed concreteweb reinforcementtransverse bendingBuilding and ConstructionStructural engineeringSettore ICAR/09 - Tecnica Delle CostruzioniShear (geology)Transverse shear deformationbusinessGeology
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Symplectic analysis of thin-walled curved box girders with torsion, distortion and shear lag warping effects

2022

Shear lag effect and torsional and distortional warping can significantly affect the performance of thin-walled curved box girders used in modern bridge engineering. The structural behaviour of these bridges exhibits complexity due to coupled bending and torsion together with warping effects of non-uniform torsion, distortion and shear lag. A practical method of analysis, based on the symplectic approach, with the same perspective as the Higher Order Beam Theories, is presented for overcoming the difficulties of numerical approaches via the Finite Element Method. In this paper, the Hamiltonian Structural Analysis method implements the analysis of the shear lag effect together with non-unifo…

WarpingSymplectic ElasticityHamiltonian Structural AnalysisMechanical EngineeringShear-lagTimoshenko curved beamsDistortionBuilding and ConstructionCurved bridgesNon-uniform torsionGBTThin-walled beamsBox girdersHigher Order Beam TheoriesCivil and Structural Engineering
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