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The influence of the edge beam on the structuralbehavior of bridge deck overhangs
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0001-9190-3050
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Skanska Sweden.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0002-5447-2068
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Bridge edge beams in Sweden may incur up to 60% of the life-cycle measures along thebridge’s life span. In addition, road works results in traffic disturbances and, thus, increaseduser costs. Consequently, the Swedish Transport Administration started a project to developsolutions that can become better for the society in terms of cost. A life-cycle cost analysis wascarried out to evaluate which proposals could qualify for more detailed studies and a demonstrationproject. The results showed that a solution without edge beam may result optimal.Even though such design solution might still fulfill the functional requirements of the edgebeam, a structural analysis should be performed to evaluate its robustness.The aim of this paper is to study the influence of the edge beam on the structural behaviorof bridge deck slab overhangs. A non-linear 3D finite element model in the commercial softwareABAQUS was developed for this purpose and validated using experimental data availablein the literature. The load-displacement curves and the failure modes are observed. Theshear and bending moment capacity of the overhang is studied. An assessment of existingdesign methods is presented in light of the load capacity obtained for each case.The results show that the edge beam contributes to a higher load capacity of the bridgeoverhang than of that without edge beam. The shear capacity of the slab is more efficientlydistributed, due to a stiffening effect in the critical cross section close to the transversal freeedge. Therefore, the effect of removing the edge beam should be investigated for the bridgecase at hand to account for the loss of robustness compared to a case with an edge beam. Existing design methods should be reviewed in order to account for the influence of an edgebeam.

National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-181807OAI: oai:DiVA.org:kth-181807DiVA: diva2:900641
Note

QS 2016

Available from: 2016-02-04 Created: 2016-02-04 Last updated: 2016-02-05Bibliographically approved
In thesis
1. Bridge Edge Beams: LCCA and Structural Analysis for the Evaluation of New Concepts
Open this publication in new window or tab >>Bridge Edge Beams: LCCA and Structural Analysis for the Evaluation of New Concepts
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Bridge edge beams in Sweden may involve up to 60% of the life-cyclemeasure costs incurred along the road bridge’s life span. Moreover, usercosts as means of traffic disturbances are caused. Consequently, the SwedishTransport Administration started a project to find better alternativeedge beam design proposals for the society.The goal of this thesis is to contribute to the development of bridgeedge beam solutions that can result better for the society in terms of totalcost and still fulfill the functional requirements, through the evaluation ofnew concepts. A life-cycle cost analysis was carried out to assess the proposedalternatives. The results served as a guidance to identify alternativesthat could qualify for more detailed studies. One such proposal wasa solution without edge beam. Since the edge beam is known to distributeconcentrated loads, the removal of such member could lead to loss ofrobustness of concrete bridge deck slabs. Thus, a structural analysis todetermine the influence of the edge beam was performed through nonlinearfinite-element modelling validated from experimental evidenceavailable in the literature. An assessment of the existing calculationmethods for the overhang slab is also presented.The results show that the edge beam behaves as a load-carrying memberwhich contributes to a wider distribution of shear forces. An increasedload resisting capacity for reinforced concrete bridge deck overhang slabswas documented. The removal of the edge beam would imply loss of robustnessin the bridge, which might have to be counteracted by an increaseof the thickness of the deck slab.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. xix, 89 p.
Series
TRITA-BKN. Bulletin, ISSN 1103-4270 ; 137
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-181808 (URN)
Presentation
2016-02-12, B1, Brinellvägen 23, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20160205

Available from: 2016-02-05 Created: 2016-02-04 Last updated: 2016-02-05Bibliographically approved

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