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Bridge Edge Beams: LCCA and Structural Analysis for the Evaluation of New Concepts
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0001-9190-3050
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: urn:nbn:se:kth:diva-181808OAI: oai:DiVA.org:kth-181808DiVA: diva2:900643
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
List of papers
1. Life-cycle cost analysis as a tool in the developing process for new bridge edge beam solutions
Open this publication in new window or tab >>Life-cycle cost analysis as a tool in the developing process for new bridge edge beam solutions
2016 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 12, no 9, 1185-1201 p.Article in journal (Refereed) Published
Abstract [en]

Currently in Sweden, the life-cycle measures applied on bridge edge beams may take up to 60% of the total costs incurred along the road bridges’ life span. Moreover, significant disturbances for the road users are caused. Therefore, the Swedish Transport Administration has started a project to develop alternative edge beam design solutions that are better for society in terms of cost. The purpose of this article is to investigate whether these proposals can qualify for more detailed studies through an evaluation and comparison based on a comprehensive life-cycle cost analysis. The alternatives including the standard design are applied to typical Swedish bridges. The impact of the values of the parameters with the largest influence is investigated by sensitivity analyses. Results with different life-cycle strategies are shown. The positive influences in the total life-cycle cost of a stainless steel reinforced solution and of the enhanced construction technique are estimated. The concrete edge beam integrated with the deck seems to be favourable, which is in line with international experience observed. Different designs may be appropriate depending on the bridge case and the life-cycle strategy. The Swedish Transport Administration will carry out a demonstration project in a bridge with one of the proposals.

Place, publisher, year, edition, pages
Taylor & Francis, 2016
Keyword
bridge decks, bridge edge beam system, bridge maintenance, bridges, edge beams, infrastructure planning, Life-cycle costs, sensitivity analysis
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-181806 (URN)10.1080/15732479.2015.1095770 (DOI)000379180200014 ()2-s2.0-84955124708 (Scopus ID)
Note

QC 20160812

Available from: 2016-02-04 Created: 2016-02-04 Last updated: 2017-11-30Bibliographically approved
2. The influence of the edge beam on the structuralbehavior of bridge deck overhangs
Open this publication in new window or tab >>The influence of the edge beam on the structuralbehavior of bridge deck overhangs
(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:nbn:se:kth:diva-181807 (URN)
Note

QS 2016

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

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