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Johansson, Bernt
Publications (10 of 73) Show all publications
Cremona, C., Eichler, B., Johansson, B. & Larsson, T. (2013). Improved assessment methods for static and fatigue resistance of old metallic railway bridges (ed.). Journal of Bridge Engineering, 18(11), 1164-1173
Open this publication in new window or tab >>Improved assessment methods for static and fatigue resistance of old metallic railway bridges
2013 (English)In: Journal of Bridge Engineering, ISSN 1084-0702, E-ISSN 1943-5592, Vol. 18, no 11, p. 1164-1173Article in journal (Refereed) Published
Abstract [en]

A large number of the bridges in the European railway networks are metallic bridges. The increasing volume of traffic and axle weight of trains mean that for many structures the loads today are much higher than those envisaged when they were designed. This paper presents a summary of the different recommendations and advices proposed in "Guidelines for Load and Resistance Assessment of Existing European Railway Bridges" of the European Union founded project "Sustainable bridges" for assessing old metal railway bridges. The knowledge of the material properties of existing metal bridges is essential for the resistance assessment and the determination of the remaining lifetime of old metallic bridges. Furthermore, old bridges require more exact and efficient assessment methods that call for a precise description of the material. Among the problems met in metal bridges and material properties estimation, fatigue is the most common cause of failure. To be able to make accurate assessments of existing bridges, it is important to know the behaviour of bridges exposed to fatigue, and how the old materials behave due to cyclic exposure. The main question answered herein is how to make a safe estimation concerning the remaining life in service. The possible traffic load on steel rail bridges is usually limited by the fatigue resistance, but for certain situations the static resistance has also to be checked. Most design rules for steel structures, for instance those in Eurocode 3, are applicable also to riveted structures. However, some information is missing on how to deal with the special case that elements are intermittently connected in contrast welded structures that are connected continuously. As the traditional methods for assessing the resistance of steel bridges are based on elastic analysis, a method for utilizing a limited redistribution of bending moments based on beam theory is proposed.

National Category
Building Technologies Infrastructure Engineering
Research subject
Steel Structures; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-7380 (URN)10.1061/(ASCE)BE.1943-5592.0000466 (DOI)000325640300006 ()2-s2.0-84886480686 (Scopus ID)5c15309f-b927-4edd-b64f-214cdab1a605 (Local ID)5c15309f-b927-4edd-b64f-214cdab1a605 (Archive number)5c15309f-b927-4edd-b64f-214cdab1a605 (OAI)
Note

Validerad; 2013; 20120823 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Johansson, B. & Veljkovic, M. (2009). Review of plate buckling rules in EN 1993-1-5 (ed.). Paper presented at . Steel Construction - Design and Research, 2(4), 228-234
Open this publication in new window or tab >>Review of plate buckling rules in EN 1993-1-5
2009 (English)In: Steel Construction - Design and Research, ISSN 1867-0520, Vol. 2, no 4, p. 228-234Article in journal (Refereed) Published
Abstract [en]

EN 1993-1-5 provides harmonized European design rules for plated structures. It is a step forward in the harmonization process, but like all the Eurocodes it includes many options for national choices, in terms of parameters and also methods, which leads to quite different results. Actually, there are four different methods for dealing with buckling problems. One purpose of this paper is to illustrate differences by way of examples and also to suggest topics for studies intended to improve the design rules and bring them closer together. The revision of EN 1993-1-5 is due to take place around 2014 and there is ample time for performing research projects that can form the basis for the new version. Examples of such topics are the recalibration of buckling curves, reviewing the interaction checks and the verification format of the reduced stress method.

National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-5609 (URN)3c1b4a80-e95f-11de-bae5-000ea68e967b (Local ID)3c1b4a80-e95f-11de-bae5-000ea68e967b (Archive number)3c1b4a80-e95f-11de-bae5-000ea68e967b (OAI)
Note
Godkänd; 2009; 20091215 (milan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-08Bibliographically approved
Christian, C., Johansson, B., Larsson, T., Patron, A., S, H. & B, E. (2008). Improved assessment methods for static and fatigue resistance of old metal railway bridges (ed.). In: (Ed.), (Ed.), Bridge Maintenance, Safety Management, Health Monitoring and Informatics: Proceedings of the Fourth International Conference on Bridge Maintenance, Safety and Management, July 13-17 2008, Seoul, Korea - IABMAS '08. Paper presented at International Conference on Bridge Maintenance, Safety and Management : 13/07/2008 - 17/07/2008 (pp. 3666-3674). Boca Raton, Fla: Taylor and Francis Group
Open this publication in new window or tab >>Improved assessment methods for static and fatigue resistance of old metal railway bridges
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2008 (English)In: Bridge Maintenance, Safety Management, Health Monitoring and Informatics: Proceedings of the Fourth International Conference on Bridge Maintenance, Safety and Management, July 13-17 2008, Seoul, Korea - IABMAS '08, Boca Raton, Fla: Taylor and Francis Group , 2008, p. 3666-3674Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Boca Raton, Fla: Taylor and Francis Group, 2008
National Category
Infrastructure Engineering Building Technologies
Research subject
Structural Engineering; Steel Structures
Identifiers
urn:nbn:se:ltu:diva-40729 (URN)79952292774 (Scopus ID)ff78a380-b088-11dd-9c9d-000ea68e967b (Local ID)978-0-415-46844-2 (ISBN)ff78a380-b088-11dd-9c9d-000ea68e967b (Archive number)ff78a380-b088-11dd-9c9d-000ea68e967b (OAI)
Conference
International Conference on Bridge Maintenance, Safety and Management : 13/07/2008 - 17/07/2008
Note
Godkänd; 2008; Bibliografisk uppgift: Abstract pp 710-711 + full version on CD pp 3666-3674.; 20081112 (toblar)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Veljkovic, M. & Johansson, B. (2008). Thin-walled steel columns with partially closed cross-section: tests and computer simulations (ed.). Paper presented at . Journal of constructional steel research, 64(7-8), 816-821
Open this publication in new window or tab >>Thin-walled steel columns with partially closed cross-section: tests and computer simulations
2008 (English)In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 64, no 7-8, p. 816-821Article in journal (Refereed) Published
Abstract [en]

Cold formed sections can be optimized for different purposes and they are fairly inexpensive to produce in small series. They have an inherent weakness in their small torsional stiffness, which is unfavourable for columns. One solution presented here is to make a closed section by adding a thin cover plate connected discretely with self-tapping screws. It is here called a partially closed cross-section because it is not continuously and rigidly connected. The aim of this paper is to evaluate the efficiency of this solution by comparing the behaviour of partially closed and open cross-section. Four columns were tested within the project, two of them with centric axial load and two with eccentricities. Numerical analysis was performed using ABAQUS for establishing the influence of the cover plate on the critical load and the resistance. A good agreement between non-linear FEM and experiments were found. After this verification of the FE model a parametric study was carried out. Results of experiments and numerical analysis were compared with the predicted resistance by Eurocode 3, Part 1-3, and the Direct Strength Method. Both design methods give good predictions of the resistance.

Abstract [en]

Cold formed sections can be optimized for different purposes and they are fairly inexpensive to produce in small series. They have an inherent weakness in their small torsional stiffness, which is unfavourable for columns. One solution presented here is to make a closed section by adding a thin cover plate connected discretely with self-tapping screws. It is here called a partially closed cross-section because it is not continuously and rigidly connected. The aim of this paper is to evaluate the efficiency of this solution by comparing the behaviour of partially closed and open cross-section. Four columns were tested within the project, two of them with centric axial load and two with eccentricities. Numerical analysis was performed using ABAQUS for establishing the influence of the cover plate on the critical load and the resistance. A good agreement between non-linear FEM and experiments were found. After this verification of the FE model a parametric study was carried out. Results of experiments and numerical analysis were compared with the predicted resistance by Eurocode 3, Part 1-3, and the Direct Strength Method. Both design methods give good predictions of the resistance. Udgivelsesdato: July

National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-6824 (URN)10.1016/j.jcsr.2008.01.038 (DOI)000256647200012 ()2-s2.0-42749093277 (Scopus ID)5202e490-2375-11dd-ac76-000ea68e967b (Local ID)5202e490-2375-11dd-ac76-000ea68e967b (Archive number)5202e490-2375-11dd-ac76-000ea68e967b (OAI)
Note
Validerad; 2008; 20080516 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kuhlmann, U., Braun, B., Johansson, B., Raoul, J., Clarin, M., Davaine, L., . . . Martin, P.-O. (2007). A survey on patch loading models for bridge launching (ed.). In: (Ed.), Ulrike Kuhlmann (Ed.), Improving Infrastructure Worldwide: IABSE symposium, Weimar 2007, [September 19 - 21, 2007] ; report. Paper presented at IABSE Symposium : 19/09/2007 - 21/09/2007. Zürich: International Association for Bridge and Structural Engineering, Article ID A-0202.
Open this publication in new window or tab >>A survey on patch loading models for bridge launching
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2007 (English)In: Improving Infrastructure Worldwide: IABSE symposium, Weimar 2007, [September 19 - 21, 2007] ; report / [ed] Ulrike Kuhlmann, Zürich: International Association for Bridge and Structural Engineering, 2007, article id A-0202Conference paper, Published paper (Refereed)
Abstract [en]

During the incremental launching of steel and composite bridges high support reactions have to be introduced into the slender steel webs of the bridge girder. In the past, the specific characteristics of bridge launching such as long loading lengths and longitudinal stiffeners were not covered appropriately by existing design formulae for patch loading. In the frame of the research project “Competitive Steel and Composite Bridges by Improved Steel Plated Structures (COMBRI)” a clear improvement of the patch loading resistances for I-girders and box sections could be derived leading to more economic solutions for this type of loading. The paper introduces the basic concepts of the developed models for both unstiffened girders and girders with open-section and closed-section longitudinal stiffeners as well as a software tool for the advanced determination of elastic critical buckling loads and modes. A comparison of the main area of application and the resulting economic advantages concludes the survey.

Place, publisher, year, edition, pages
Zürich: International Association for Bridge and Structural Engineering, 2007
Series
IABSE Report ; 93
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-30952 (URN)4f9cc270-22a3-11dd-ac76-000ea68e967b (Local ID)978-3-85748-116-1 (ISBN)4f9cc270-22a3-11dd-ac76-000ea68e967b (Archive number)4f9cc270-22a3-11dd-ac76-000ea68e967b (OAI)
Conference
IABSE Symposium : 19/09/2007 - 21/09/2007
Note

Godkänd; 2007; 20080515 (ysko)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Cermona, C., Patron, A., Hoehler, S., Eichler, B., Johansson, B. & Larsson, T. (2007). Improved assessment methods for static and fatigue resistance of old metal railway bridges (ed.). In: (Ed.), Jan Bien; Lennart Elfgren; Jan Olofsson (Ed.), Sustainable bridges: assessment for future traffic demands and longer lives. Paper presented at Sustainable Bridges - Assessment for Future Traffic Demands and Longer Lives : 10/10/2007 - 11/10/2007 (pp. 261-272). Wrocław: Dolnoslaskie Wydawnictwo Edukacyjne
Open this publication in new window or tab >>Improved assessment methods for static and fatigue resistance of old metal railway bridges
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2007 (English)In: Sustainable bridges: assessment for future traffic demands and longer lives / [ed] Jan Bien; Lennart Elfgren; Jan Olofsson, Wrocław: Dolnoslaskie Wydawnictwo Edukacyjne , 2007, p. 261-272Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Wrocław: Dolnoslaskie Wydawnictwo Edukacyjne, 2007
National Category
Building Technologies Infrastructure Engineering
Research subject
Steel Structures; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-33072 (URN)7d62b7d0-7bde-11dc-a72d-000ea68e967b (Local ID)978-83-7125-161-0 (ISBN)7d62b7d0-7bde-11dc-a72d-000ea68e967b (Archive number)7d62b7d0-7bde-11dc-a72d-000ea68e967b (OAI)
Conference
Sustainable Bridges - Assessment for Future Traffic Demands and Longer Lives : 10/10/2007 - 11/10/2007
Note
Godkänd; 2007; 20071016 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Hällmark, R., Collin, P., Petursson, H. & Johansson, B. (2007). Simulation of low-cycle fatigue in integral abutment piles (ed.). In: (Ed.), Ulrike Kuhlmann (Ed.), Improving Infrastructure Worldwide: IABSE symposium, Weimar 2007, [September 19 - 21, 2007] ; report. Paper presented at IABSE Symposium : 19/09/2007 - 21/09/2007. Zürich: International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Simulation of low-cycle fatigue in integral abutment piles
2007 (English)In: Improving Infrastructure Worldwide: IABSE symposium, Weimar 2007, [September 19 - 21, 2007] ; report / [ed] Ulrike Kuhlmann, Zürich: International Association for Bridge and Structural Engineering, 2007Conference paper, Published paper (Refereed)
Abstract [en]

Integral abutment bridges are bridges without any expansion joints, and their largest benefits are the lower construction- and maintenance costs. In order to build longer integral bridges it might be necessary to allow plastic hinges to be developed in the piles. Lateral thermal movements are the major reason to plastic deformations, and since temperature variations are cyclic it has to be proved that low-cycle fatigue will not occur. A simulation of the pile strain spectra should be able to take into account the strains caused by temperature variations and traffic loads. Such a model has been created from real temperature data and traffic loads measured by Bridge-Weigh-In-Motion technology. Monte Carlo simulations have been performed in order to simulate daily and annual temperature changes as well as the varying traffic loads. Piles strains have been calculated, and their fatigue effect has been evaluated.

Place, publisher, year, edition, pages
Zürich: International Association for Bridge and Structural Engineering, 2007
Series
IABSE Report ; 93
National Category
Infrastructure Engineering Building Technologies
Research subject
Structural Engineering; Steel Structures
Identifiers
urn:nbn:se:ltu:diva-38480 (URN)ce56adc0-780c-11dc-80da-000ea68e967b (Local ID)978-385748-116-1 (ISBN)ce56adc0-780c-11dc-80da-000ea68e967b (Archive number)ce56adc0-780c-11dc-80da-000ea68e967b (OAI)
Conference
IABSE Symposium : 19/09/2007 - 21/09/2007
Note
Godkänd; 2007; 20071011 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-20Bibliographically approved
Johansson, B. (2006). Att konstruera med stål : läromedel för konstruktörer: Modul 4, Bärverksanalys (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Att konstruera med stål : läromedel för konstruktörer: Modul 4, Bärverksanalys
2006 (Swedish)Other (Other (popular science, discussion, etc.))
Place, publisher, year, pages
Luleå: Luleå tekniska universitet, 2006. p. 28
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-33636 (URN)86564940-2423-11dd-9e62-000ea68e967b (Local ID)86564940-2423-11dd-9e62-000ea68e967b (Archive number)86564940-2423-11dd-9e62-000ea68e967b (OAI)
Note
Godkänd; 2006; 20080517 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Johansson, B. (2006). Att konstruera med stål : läromedel för konstruktörer: Modul 5, Tvärsnittsbärförmåga (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Att konstruera med stål : läromedel för konstruktörer: Modul 5, Tvärsnittsbärförmåga
2006 (Swedish)Other (Other (popular science, discussion, etc.))
Place, publisher, year, pages
Luleå: Luleå tekniska universitet, 2006. p. 50
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-33518 (URN)5b2c7b40-2423-11dd-9e62-000ea68e967b (Local ID)5b2c7b40-2423-11dd-9e62-000ea68e967b (Archive number)5b2c7b40-2423-11dd-9e62-000ea68e967b (OAI)
Note
Godkänd; 2006; 20080517 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Collin, P. & Johansson, B. (2006). Bridges in high strength steel (ed.). In: (Ed.), (Ed.), Responding to Tomorrow's Challenges in Structural Engineering: IABSE Symposium Budapest 2006 ; report. Paper presented at IABSE Symposium : 13/09/2006 - 15/09/2006 (pp. 434-435). Zürich: International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Bridges in high strength steel
2006 (English)In: Responding to Tomorrow's Challenges in Structural Engineering: IABSE Symposium Budapest 2006 ; report, Zürich: International Association for Bridge and Structural Engineering, 2006, p. 434-435Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Zürich: International Association for Bridge and Structural Engineering, 2006
Series
IABSE Report, ISSN 1025-9104 ; 92
National Category
Infrastructure Engineering Building Technologies
Research subject
Structural Engineering; Steel Structures
Identifiers
urn:nbn:se:ltu:diva-39651 (URN)e7b23610-320e-11dd-b113-000ea68e967b (Local ID)9783857481147 (ISBN)e7b23610-320e-11dd-b113-000ea68e967b (Archive number)e7b23610-320e-11dd-b113-000ea68e967b (OAI)
Conference
IABSE Symposium : 13/09/2006 - 15/09/2006
Note
Godkänd; 2006; 20080604 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-20Bibliographically approved
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