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Andersson, Erik
Publications (5 of 5) Show all publications
Sarmiento, S., González-Libreros, J., Elfgren, L., Andersson, E., Petersson, M. & Sas, G. (2023). Validation of an Experimental Methodology for Measuring Concrete Fracture Energy in Existing Structures. In: Alper Ilki, Derya Çavunt, Yavuz Selim Çavunt (Ed.), Building for the Future: Durable, Sustainable, Resilient - Proceedings of the Symposium 2023 - Volume 1: . Paper presented at International Symposium of the International Federation for Structural Concrete, fib Symposium 2023, Istanbul, Turkey, June 5-7, 2023 (pp. 936-945). Springer Science and Business Media Deutschland GmbH, 1
Open this publication in new window or tab >>Validation of an Experimental Methodology for Measuring Concrete Fracture Energy in Existing Structures
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2023 (English)In: 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, Published 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.

Place, publisher, year, edition, pages
Springer Science and Business Media Deutschland GmbH, 2023
Series
Lecture Notes in Civil Engineering, ISSN 2366-2557, E-ISSN 2366-2565 ; 349
Keywords
Existing structures, experimental test, fracture energy, numerical modeling, tensile strength
National Category
Infrastructure Engineering Applied Mechanics
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-99538 (URN)10.1007/978-3-031-32519-9_93 (DOI)2-s2.0-85164011032 (Scopus ID)978-3-031-32518-2 (ISBN)978-3-031-32519-9 (ISBN)
Conference
International Symposium of the International Federation for Structural Concrete, fib Symposium 2023, Istanbul, Turkey, June 5-7, 2023
Available from: 2023-08-11 Created: 2023-08-11 Last updated: 2023-08-11Bibliographically approved
Agredo Chavez, A. M., Gonzalez, J., Andersson, K., Leidzen, J., Andersson, E., Petersson, M., . . . Häggström, J. (2022). Cracking and Fatigue of Heavy Loaded Prestressed Concrete Bridge in Sweden. In: František Wald; Pavel Ryjáček (Ed.), IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures - Report, International Association for Bridge and Structural Engineering: . Paper presented at IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, May 25-27, 2022 (pp. 792-799). Zürich: International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Cracking and Fatigue of Heavy Loaded Prestressed Concrete Bridge in Sweden
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2022 (English)In: 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, Published 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.

Place, publisher, year, edition, pages
Zürich: International Association for Bridge and Structural Engineering, 2022
Keywords
Prestressed concrete bridge, cracking, fatigue, monitoring, assessment, heavy loading
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-92177 (URN)10.2749/prague.2022.0792 (DOI)2-s2.0-85133515089 (Scopus ID)
Conference
IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, May 25-27, 2022
Funder
Swedish Transport Administration
Note

ISBN for host publication: 978-3-85748-181-9

Available from: 2022-07-15 Created: 2022-07-15 Last updated: 2024-03-14Bibliographically approved
Ulfberg, A., Gonzalez-Libreros, J., Das, O., Sas, G., Andersson, E., Bista, D., . . . Seger, A. (2022). Influence of large-scale asperities on the stability of concrete dams. In: IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report: . Paper presented at IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, May 25-27, 2022 (pp. 1358-1365). International Association for Bridge and Structural Engineering (IABSE)
Open this publication in new window or tab >>Influence of large-scale asperities on the stability of concrete dams
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2022 (English)In: IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report, International Association for Bridge and Structural Engineering (IABSE) , 2022, p. 1358-1365Conference paper, Published 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.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering (IABSE), 2022
Series
IABSE Reports ; 118
Keywords
Concrete dams, digital image correlation, finite element analysis, scale model tests
National Category
Geotechnical Engineering Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-94796 (URN)10.2749/prague.2022.1358 (DOI)2-s2.0-85133518446 (Scopus ID)
Conference
IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, May 25-27, 2022
Funder
Swedish Research Council Formas, 01236
Note

ISBN for host publication: 978-3-85748-183-3

Available from: 2022-12-12 Created: 2022-12-12 Last updated: 2023-04-17Bibliographically approved
Varedian, M., Collin, P., Eriksson, K. & Andersson, E. (2018). An Experimental Study of Friction Connection for Different Surface Treatments. In: : . Paper presented at 9th International Symposium on Steel Bridges, Prague, Czech Republic (Steel Bridges 2018), September 10-11, 2018.
Open this publication in new window or tab >>An Experimental Study of Friction Connection for Different Surface Treatments
2018 (English)Conference paper, Oral presentation only (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.

National Category
Infrastructure Engineering
Research subject
Solid Mechanics; Structural Engineering; Steel Structures
Identifiers
urn:nbn:se:ltu:diva-87574 (URN)
Conference
9th International Symposium on Steel Bridges, Prague, Czech Republic (Steel Bridges 2018), September 10-11, 2018
Available from: 2021-10-21 Created: 2021-10-21 Last updated: 2023-09-05Bibliographically approved
Hällmark, R., Collin, P., Petersson, M. & Andersson, E. (2017). Monitoring of a bridge strengthened with post-installed coiled spring pins. In: IABSE Symposium, Vancouver, 2017: Engineering the Future. Paper presented at 39th IABSE Symposium, Engineering the Future, Vancouver, Canada, Sept 21-23, 2017 (pp. 1201-1208). Zürich, Switzerland: IABSE - International Association for Bridges and Structural Engineering
Open this publication in new window or tab >>Monitoring of a bridge strengthened with post-installed coiled spring pins
2017 (English)In: IABSE Symposium, Vancouver, 2017: Engineering the Future, Zürich, Switzerland: IABSE - International Association for Bridges and Structural Engineering , 2017, p. 1201-1208Conference paper, Published 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.

Place, publisher, year, edition, pages
Zürich, Switzerland: IABSE - International Association for Bridges and Structural Engineering, 2017
Keywords
Shear connector, bridge monitoring, composite bridge, composite action, coiled spring pin, shear studs, bridge strengthening, rehabilitation
National Category
Infrastructure Engineering Building Technologies
Research subject
Structural Engineering; Steel Structures
Identifiers
urn:nbn:se:ltu:diva-66148 (URN)2-s2.0-85050016139 (Scopus ID)978-3-85748-153-6 (ISBN)
Conference
39th IABSE Symposium, Engineering the Future, Vancouver, Canada, Sept 21-23, 2017
Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2023-09-05Bibliographically approved
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