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Lateral trusses between I-girders introducing torsional stiffness to a composite bridge in Guatemala
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-9627-4713
PEDELTA, Barcelona, Spain.
PEDELTA, Barcelona, Spain.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-8353-9225
2023 (English)In: Eurosteel 2023: September 12–14, 2023, Amsterdam / [ed] Milan Veljkovic; Trayana Tankova; Florentia Kavoura; Andreas Taras; Vlad Silvestru; Valentino Vigneri, John Wiley & Sons, 2023, p. 1049-1054Conference paper, Published paper (Refereed)
Abstract [en]

The ways of designing and building steel girder bridges with a composite concrete deck vary much between different parts of the world. A bridge system with twin steel I-girders or a concept with multiple (more than two) girders can be used. The design and use of details and secondary systems also vary a lot. In order to give horizontal stabilization and distribute horizontal loads, bracing between the I-girders bracings are often used. Although not so common, the bracing can also be used to distribute vertical loads between the main girders. To describe and to analyze the possible impact from using a lateral bracing, this paper describes the design of a curved bridge in Guatemala City and its challenges. The new Bridge over the Pinula River is designed as a steel-concrete composite bridge with multiple steel girders with a concrete deck on top and has lateral bracing between the girders. The bridge is used as a case study to analyze the impact from a lateral bracing system on the vertical load distribution between the longitudinal girders. The bridge was designed with lateral bracing between the top flanges along the whole bridge and with bracing between the lower flanges near the supports. The case study shows that the distribution of eccentric vertical loads between the longitudinal girders can be improved by using lateral bracing between the lower flanges for multiple girders. In some cases, it may not be beneficial to use lateral bracings along the whole bridge length, like for example this bridge. In this case due to the governing design cases in the construction stages where these bracings influenced the torsional stiffness of the bridge in such way that an unfavorable distribution of the support reactions between the six girders at some supports was achieved.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023. p. 1049-1054
Series
c/e papers - Proceedings in civil engineering, E-ISSN 2509-7075 ; 6
Keywords [en]
Bridge, I-girder, lateral bracing, launching, steel-concrete composite, torsional stiffness
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-96210DOI: 10.1002/cepa.2684OAI: oai:DiVA.org:ltu-96210DiVA, id: diva2:1745132
Conference
10th Eurosteel conference, (EUROSTEEL2023), Amsterdam, Netherlands, September 12-14, 2023
Note

Full text license: CC BY

Available from: 2023-03-22 Created: 2023-03-22 Last updated: 2023-11-24Bibliographically 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, Peter

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