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Box-action giving new life-time to old steel bridges
Ramboll, Box 850, 97126, Luleå, Sweden.ORCID iD: 0000-0002-9627-4713
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-8353-9225
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
2018 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

When strengthening existing I-girder composite bridges one idea is to make the cross section act like a box section, by adding a horizontal truss between the bottom flanges. This means that eccentric loads produce a torque that is transferred by shear forces around the section. The magnitude of the effects coming from introducing such a framework between girders is addressed in this article. The fatigue resistance will be improved by the reduced stress ranges and increased amount of tolerated load cycles and extend the lifetime of the details, and by so the lifetime for the bridge. The work described in the paper is part of the European R&D project Prolonging Life Time of Old Steel and Steel-Concrete Bridges (ProLife), RFCS 2015-00025.

Place, publisher, year, edition, pages
2018.
National Category
Infrastructure Engineering
Research subject
Structural Engineering; Steel Structures
Identifiers
URN: urn:nbn:se:ltu:diva-87572OAI: oai:DiVA.org:ltu-87572DiVA, id: diva2:1604721
Conference
9th International Symposium on Steel Bridges. Prague, Czech Republic (Steel Bridges 2018), September 10-11, 2018
Funder
Swedish Transport AdministrationSvenska Byggbranschens Utvecklingsfond (SBUF)
Note

Funder: Research Fund for Coal and Steel; Transport Administration of Finland; Transport Administration of Norway; Ramboll

Available from: 2021-10-21 Created: 2021-10-21 Last updated: 2023-09-05Bibliographically approved
In thesis
1. I-girder Composite Bridges with Lateral Bracing: Improved load distribution
Open this publication in new window or tab >>I-girder Composite Bridges with Lateral Bracing: Improved load distribution
2023 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with the subject of lateral bracing between the bottom flanges of I-girder composite bridges. The focus is on the impact of adding lateral bracing on existing bridges, as well as on new bridges. Experience and knowledge from bridge projects around the world are investigated and implemented in the evaluation of the research subject.

Many existing bridges are in need of being strengthened or replaced, due to the increased traffic volume and heavier traffic loads. Different approaches can be used to prolong the lifetime of existing bridges. The approach is different depending on the cause, but for increasing the lifetime regarding fatigue some of the most suitable options are described in this thesis. A proposed concept is presented, in this thesis, along with some research questions to be answered.

The use of lateral bracings in composite bridges varies between different parts of the world. In one country it can be a requirement/common praxis for long span composite bridges with two I-girders, in other countries there are no requirements of using them. Some parts of these regulations and requirements can be traced back to the tradition in both manufacturing and construction of this type of bridges. This thesis investigates how lateral bracing is used around the world to distribute eccentric loads between primary longitudinal structural members, provide resistance to lateral loads, and to permit an existing two-girder structural system to be retrofitted to behave similarly to an often more expensive closed steel box girder.

Furthermore, several case studies have been conducted to investigate the impact on the structural behavior of composite bridges where a lateral bracing is implemented in the structure. The results from these case studies are presented in the thesis and show the advantages of the quasi-box section for which the lateral bracing is closing the composite cross section. By making the I-girder composite cross section acting more like a box-section, the distribution of eccentric loads between the girders is improved. The impact on longitudinal stresses from traffic loads and the additional effects on internal sectional parts are also evaluated and discussed.

Furthermore, proposals of the connection design for lateral bracings in existing bridges are suggested. Finally, conclusions from the results are stated.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2023
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords
assessment, bridge, composite bridge, steel-concrete composite, I-girder, case study, horizontal trusses, lateral bracing, rehabilitation, strengthening, torsional stiffness, upgrading
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-96212 (URN)978-91-8048-286-8 (ISBN)978-91-8048-287-5 (ISBN)
Presentation
2023-05-12, F1031, Luleå tekniska universitet, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2023-03-22 Created: 2023-03-22 Last updated: 2023-12-18Bibliographically approved

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Vestman, VictorCollin, PeterMöller, Mikael

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