Change search
Refine search result
1 - 5 of 5
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Agredo Chavez, Angelica Maria
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Gonzalez, Jaime
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Kasper
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Leidzen, Jon
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Petersson, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Sas, Gabriel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Häggström, Jens
    Swedish Traffic Administration, Luleå, Sweden.
    Cracking and Fatigue of Heavy Loaded Prestressed Concrete Bridge in Sweden2022In: IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures - Report, International Association for Bridge and Structural Engineering / [ed] František Wald; Pavel Ryjáček, Zürich: International Association for Bridge and Structural Engineering, 2022, p. 792-799Conference paper (Refereed)
    Abstract [en]

    A prestressed concrete bridge was built in 1963 with BBRV cables. It has three spans and a total length of 134.8 m. Due to mining activities the bridge was loaded with trucks with a total weight of 90 ton during 2012-2014 and from 2019. Crack development has been monitored manually and from 2020 with strain gauges and LVDTs.

    Cracks normally vary between 0.1 to 0.3 mm in width and grow in length with time. In November 2020 some of the strain gauges on the concrete showed alarming growth and the bridge was closed for traffic. Additional strain gauges were installed on vertical reinforcement bars and an assessment was carried out of the fatigue capacity of the bridge. It was found that the new strain gauges did not indicate any growth in strain and that the fatigue capacity was sufficient. The bridge could be opened again for traffic after being closed for five weeks. Monitoring drift in the strain gauges and fatigue are discussed.

    Download full text (pdf)
    fulltext
  • 2.
    Hällmark, Robert
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Trafikverket, Luleå.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Ramböll, Luleå.
    Petersson, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Monitoring of a bridge strengthened with post-installed coiled spring pins2017In: IABSE Symposium, Vancouver, 2017: Engineering the Future, Zürich, Switzerland: IABSE - International Association for Bridges and Structural Engineering , 2017, p. 1201-1208Conference paper (Refereed)
    Abstract [en]

    Many existing bridges were not originally designed for the traffic loads and the number of load cycles which they now experience. In order to increase the load capacity of non-composite steel-concrete bridges, post installed shear connectors can be used. This paper describes a field monitoring of a steel-concrete bridge which have been strengthened with post-installed coiled spring pins as shear connectors. During the monitoring, the bridge was loaded with a 31 tonnes truck placed in specific positions while strains were measured in the steel main girders, together with the horizontal slip at the steel-concrete interface. The results indicate that the coiled spring pins prevent the slip and that they can be used for strengthening purpose. It is also observed that the friction in the steel-concrete interface can contribute quite a lot to the composite action, even though that effect cannot be accounted for in the design.

  • 3.
    Sarmiento, Silvia
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    González-Libreros, Jaime
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Petersson, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Sas, Gabriel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Validation of an Experimental Methodology for Measuring Concrete Fracture Energy in Existing Structures2023In: Building for the Future: Durable, Sustainable, Resilient - Proceedings of the Symposium 2023 - Volume 1 / [ed] Alper Ilki, Derya Çavunt, Yavuz Selim Çavunt, Springer Science and Business Media Deutschland GmbH , 2023, Vol. 1, p. 936-945Conference paper (Refereed)
    Abstract [en]

    Numerical modeling is often used to assess the load-carrying capacity of existing structures, especially for complex structural systems such as bridges. These numerical models are always sensitive to certain parameters, such as the mechanical properties of the materials. In the case of concrete structures, the tensile strength and fracture energy of concrete have demonstrated great influence in the numerical evaluation of deformations and capacity. However, for existing structures, the fracture energy value is mainly estimated using empirical formulae based on the concrete compressive strength, as there is no methodology to evaluate it experimentally. This issue leads to uncertainty regarding the obtained values and subsequently influences the results of finite element models (FEM) and capacity prediction. With the aim of reducing this uncertainty, an experimental methodology for the evaluation of the fracture energy in existing structures is validated in this paper. First, uniaxial tensile loading tests were carried out on notched standard cylinders and drilled cores specimens cast under laboratory conditions. Then, crack opening versus load curves and fracture energy values were compared to those obtained from three-point bending tests in notched beams and Finite Element Modeling. The results showed that the proposed methodology can be a potential method to estimate the fracture energy of existing structures, and the notch depth have an influence on the fracture energy value obtained.

  • 4.
    Ulfberg, Adrian
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Gonzalez-Libreros, Jaime
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Das, Oisik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Sas, Gabriel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Bista, Dipen
    Norwegian University of science and technology, Trondheim, Norway; SINTEF Narvik, Narvik, Norway.
    Arntsen, Bård
    SINTEF Narvik, Narvik, Norway.
    Seger, Andreas
    SINTEF Narvik, Narvik, Norway; The Arctic University of Norway, Tromsø, Norway.
    Influence of large-scale asperities on the stability of concrete dams2022In: IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report, International Association for Bridge and Structural Engineering (IABSE) , 2022, p. 1358-1365Conference paper (Refereed)
    Abstract [en]

    For concrete dams founded on rock, there are only a few options in the common analysis methods to account for large‐scale asperities. However, previous research alludes that they have a significant impact on the behaviour of interfaces under shear. This study investigates the behaviour of concrete dam scale models with varying interface geometries, under a realistic set of eccentric loads. The outcome of the scale model tests shows that not only the capacity of the scale models was significantly impacted by the asperities, but also the type of failure in the scale models.

  • 5.
    Varedian, Mattias
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Andersson, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    An Experimental Study of Friction Connection for Different Surface Treatments2018Conference paper (Refereed)
    Abstract [en]

    Previous preliminary testing within the European R&D project PROLIFE, (RFCS 2015-00025) of bolted lap joints loaded in shear has confirmed that small hard indenters inserted into a joint may indeed increase the effective friction of the joint. In order to further explore this feature, additional tests have been carried out with plates of different surface treatment and indenter size. Plates of structural steel grade S355+N were used in the experiments. Some plates were treated with fine blasting and others with a rougher treatment. Most plates were treated in the same way as steel components in new steel bridges in Sweden. For tests with the AMA surface treatment, 2.5 and 5.0 mm diameter stainless steel spherical indenters and 3.0 mm diameter silicon nitride spherical indenters were used. The necessary pre-loads to fully impress a 2.5 or a 5.0 mm stainless steel indenter into a steel plate surface are 10.6 and 41.0 kN, respectively, and for a 3.0 mm silicon nitride indenter 17.7 kN. In the lap joint tests an M24 bolt with a pre-loading force of 240 kN were used and the number of indenters adopted accordingly. The results were compared with each other and to slip factors according to Eurocode. The results confirm certain Eurocode friction coefficients and they further indicate which parameters need further research, in order to develop more efficient bolted friction lap joints.

    Download full text (pdf)
    fulltext
1 - 5 of 5
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf