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Nogal, M. & Honfi, D. (2019). Assessment of road traffic resilience assuming stochastic user behaviour. Reliability Engineering & System Safety, 185, 72-83
Open this publication in new window or tab >>Assessment of road traffic resilience assuming stochastic user behaviour
2019 (English)In: Reliability Engineering & System Safety, ISSN 0951-8320, E-ISSN 1879-0836, Vol. 185, p. 72-83Article in journal (Refereed) Published
Abstract [en]

When assessing the resilience of road transport networks, users’ response should be considered as they represent the main capability of the system to adapt to changes when any disruptive event occurs and to recover afterwards. Given the variability in users’ response, it seems deterministic approaches might not be adequate to represent the real system performance, thus, a stochastic perspective is required. This paper presents a new approach to assess the resilience of a traffic network when suffering from a disruptive event, considering the stochastic behaviour of the users, where their decisions will be biased by their perception of the traffic conditions rather than by the actual conditions. This approach provides more realistic patterns than the deterministic approach, mainly in terms of recovery times. The real traffic network Luxembourg-Metz has been used to illustrate the approach.

Keywords
Dynamic traffic networks, Policy making, Resilience, Road safety, Stochastic user behaviour, Stress level, Behavioral research, Motor transportation, Roads and streets, Uncertainty analysis, Dynamic traffic, Stress levels, User behaviour, Stochastic systems
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37343 (URN)10.1016/j.ress.2018.12.013 (DOI)2-s2.0-85058707087 (Scopus ID)
Note

 Funding details: 653390; Funding text 1: IMPROVER has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 653390.

Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2019-01-22Bibliographically approved
Stepinac, M., Rajčić, V. & Honfi, D. (2019). Condition assessment of timber structures - Quantifying the value of information. In: IABSE Symposium, Nantes 2018: Tomorrow's Megastructures. Paper presented at 40th IABSE Symposium in Nantes 2018: Tomorrow's Megastructures, 19 September 2018 through 21 September 2018 (pp. S27-9-S27-18).
Open this publication in new window or tab >>Condition assessment of timber structures - Quantifying the value of information
2019 (English)In: IABSE Symposium, Nantes 2018: Tomorrow's Megastructures, 2019, p. S27-9-S27-18Conference paper, Published paper (Refereed)
Abstract [en]

Advanced inspection techniques, non-destructive (NDT) and semi-destructive (SDT) testing methods and structural health monitoring (SHM) are increasingly important for the preservation of both old and new timber structures. However, e.g. the application of SHM within the context of timber structures is not adequately represented in strategic documents. COST Action TU1402 is trying enhance the benefit of SHM by novel utilization of applied decision analysis on how to assess the value of SHM - even before it is implemented. The present paper illustrates how pre-posterior decision analysis can help quantifying the Value of Information (VoI) obtained by the condition assessment of timber structures and thus help select appropriate assessment procedures and subsequent maintenance actions. As a case study a timber exhibition hall in Zagreb, Croatia is investigated in the context of VoI analysis.

Keywords
Assessment, Heritage, NDT, SHM, Timber structures, Value of information, Cost benefit analysis, Decision making, Exhibition buildings, Nondestructive examination, Timber, Assessment procedure, Condition assessments, Inspection technique, Structural health monitoring (SHM), Structural health monitoring
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37016 (URN)2-s2.0-85059399610 (Scopus ID)9783857481611 (ISBN)
Conference
40th IABSE Symposium in Nantes 2018: Tomorrow's Megastructures, 19 September 2018 through 21 September 2018
Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Larsson Ivanov, O., Honfi, D., Santandrea, F. & Stripple, H. (2019). Consideration of uncertainties in LCA for infrastructure using probabilistic methods. Structure and Infrastructure Engineering
Open this publication in new window or tab >>Consideration of uncertainties in LCA for infrastructure using probabilistic methods
2019 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980Article in journal (Refereed) Epub ahead of print
Abstract [en]

The construction and usage of transport infrastructure are major causes of greenhouse gas emissions and energy consumption. The effects of resource consumption and pollutant emissions are often quantified through Life Cycle Assessment (LCA) models. All decisions made in infrastructure projects during the whole life cycle are afflicted by uncertainty, e.g. physical properties of materials or amount of pollutants emitted by certain processes. The pervasive role of uncertainty is reflected in LCA models, which therefore should consider uncertainty from various sources and provide a sound quantification of their effects. The aim of the work presented in this paper is to give an overview of different sources of uncertainty in LCA of infrastructure projects and to describe systematic methods to evaluate their influence on the results. The possibility of including uncertainty in a LCA-tool for infrastructure is presented, studying the sensitivity of the model output to the input parameters and two alternative approaches for propagation of uncertainty using two case studies. It is shown that, besides the influence of uncertainty in emission factors, other inputs such as material amounts and service life could contribute significantly to the variability of model output and has to be considered if reliable results are sought. © 2019, © 2019 The Author(s).

Keywords
bridges, Life cycle assessment, Monte Carlo simulations, tunnels, uncertainty, variation mode and effect analysis, Energy utilization, Gas emissions, Greenhouse gases, Intelligent systems, Monte Carlo methods, Pollution, Uncertainty analysis, Effect analysis, Infrastructure project, Life Cycle Assessment (LCA), Life cycle assessment model, Physical properties of materials, Propagation of uncertainties, Transport infrastructure, Life cycle
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38227 (URN)10.1080/15732479.2019.1572200 (DOI)2-s2.0-85062357537 (Scopus ID)
Available from: 2019-03-27 Created: 2019-03-27 Last updated: 2019-03-27Bibliographically approved
Blomfors, M., Larsson Ivanov, O., Honfi, D. & Engen, M. (2019). Partial safety factors for the anchorage capacity of corroded reinforcement bars in concrete. Engineering structures, 181, 579-588
Open this publication in new window or tab >>Partial safety factors for the anchorage capacity of corroded reinforcement bars in concrete
2019 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 181, p. 579-588Article in journal (Refereed) Published
Abstract [en]

Many reinforced concrete bridges in Europe and around the world are damaged by reinforcement corrosion and the annual maintenance costs are enormous. It is therefore important to develop reliable methods to assess the structural capacity of corroded reinforced concrete structures and avoid unnecessary maintenance costs. Although there are advanced models for determining the load carrying capacity of structures, it is not obvious how they should be used to verify the performance of existing structures. To confidently assess the bond of corroded reinforcement in concrete, for example, the calculation model must give a sufficient safety margin. When designing new structures, semi-probabilistic approaches (such as the partial safety factor method) are adopted to achieve the target reliabilities specified in structural design codes. This paper uses probabilistic methods to develop partial factors for application in an existing bond model, to assess the safety of corroded reinforced concrete structures. The response of the bond model was studied using Monte Carlo (MC) simulations for several design cases, with probability distributions fitted to the results. Partial factors were then derived, based on these distributions. Furthermore, an MC-based simulation technique called “importance sampling” was used to study the reliability of several deterministic bond assessments conducted using these partial factors. The results show that deterministic assessments which use the proposed partial factors lead to a safety level at least equal to the target value. The results presented in this paper will support the assessment of reinforced concrete structures with anchorage problems and give a reasonable approximation of the anchorage capacity with sufficient safety margin. When generalised to cover other failure modes and structural configurations, this will enable better utilisation of damaged structures and lead to major environmental and economical savings for society.

Keywords
Anchorages (foundations), Bond strength (materials), Bridges, Concrete beams and girders, Concrete buildings, Concrete construction, Concrete reinforcements, Costs, Electrochemical corrosion, Importance sampling, Maintenance, Monte Carlo methods, Probability distributions, Reinforced concrete, Safety factor, Structural design, Corroded reinforcement, Partial safety factor, Probabilistic approaches, Probabilistic methods, Reinforcement corrosion, Structural capacities, Structural configurations, Structural design codes, Failure (mechanical)
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36916 (URN)10.1016/j.engstruct.2018.12.011 (DOI)2-s2.0-85058677355 (Scopus ID)
Note

Funding details: Charles Babbage Institute, University of Minnesota; Funding details: Chalmers Tekniska Högskola;

Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-03-06Bibliographically approved
Leander, J., Honfi, D., Larsson Ivanov, O. & Björnsson, I. (2018). A decision support framework for fatigue assessment of steel bridges. Engineering Failure Analysis, 91, 306-314
Open this publication in new window or tab >>A decision support framework for fatigue assessment of steel bridges
2018 (English)In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 91, p. 306-314Article in journal (Refereed) Published
Abstract [en]

Many bridges are approaching or have already passed their expected service life. For steel bridges, fatigue is often the decisive degradation phenomenon that theoretically puts restrictions on a continued use. At the same time, fatigue is also afflicted with large uncertainties on the resistance side as well as on the action effect side. An accurate assessment of the service life will require measures outside the governing regulations but understanding what steps to take and how to consider the outcome for decisions on interventions can be a difficult task for a non-expert. This paper presents possible assessment actions and a decision support framework for rational decisions on interventions to extend the theoretical service life of existing bridges. A case study of a critical railway bridge is incorporated to demonstrate the framework. The aim is to provide a tool for bridge managers on how to evaluate and procure different assessment actions.

Keywords
Bridges, Fatigue, Risk, Decisions Monitoring
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34072 (URN)10.1016/j.engfailanal.2018.04.033 (DOI)2-s2.0-85053060103 (Scopus ID)
Available from: 2018-07-06 Created: 2018-07-06 Last updated: 2019-01-07Bibliographically approved
Bedon, C., Honfi, D., Kozłowski, M., Eliášová, M., Vokáč Machalická, K., Vokáč, M., . . . Wüest, T. (2018). An insight on possible classification and metrics, experimental testing and numerical modelling for adaptive facades: Activity report from the ‘Structural’ Task Group. In: Proceedings of the COST Action TU1403 Adaptive Facades Network Final Conference: . Paper presented at Proceedings of the COST Action TU1403 Adaptive Facades Network Final Conference, Lucerne, Switzerland, 26-27 November, 2018 (pp. 325-336).
Open this publication in new window or tab >>An insight on possible classification and metrics, experimental testing and numerical modelling for adaptive facades: Activity report from the ‘Structural’ Task Group
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2018 (English)In: Proceedings of the COST Action TU1403 Adaptive Facades Network Final Conference, 2018, p. 325-336Conference paper, Published paper (Refereed)
National Category
Civil Engineering
Identifiers
urn:nbn:se:ri:diva-37549 (URN)
Conference
Proceedings of the COST Action TU1403 Adaptive Facades Network Final Conference, Lucerne, Switzerland, 26-27 November, 2018
Available from: 2019-01-24 Created: 2019-01-24 Last updated: 2019-02-05Bibliographically approved
Fink, G., Honfi, D., Kohler, J. & Dietsch, P. (2018). Basis of Design Principles for Timber Structures: A state-of-the-art report by COST Action FP1402 / WG 1. Shaker Verlag GmbH, Germany
Open this publication in new window or tab >>Basis of Design Principles for Timber Structures: A state-of-the-art report by COST Action FP1402 / WG 1
2018 (English)Book (Other academic)
Place, publisher, year, edition, pages
Shaker Verlag GmbH, Germany, 2018. p. 132
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36098 (URN)9783844061420 (ISBN)
Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2019-03-06Bibliographically approved
Honfi, D., Lange, D., Kozłowski, M., Sjöström, J. & Lenk, P. (2018). Behavior of load-bearing glass at elevated temperature. Paper presented at Volume 2, Issue 5-6ENGINEERED TRANSPARENCY 2018 Glass in Architecture and Structural Engineering. ce/papers, 2(5-6), 533-540
Open this publication in new window or tab >>Behavior of load-bearing glass at elevated temperature
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2018 (English)In: ce/papers, ISSN 2509-7075, Vol. 2, no 5-6, p. 533-540Article in journal (Refereed) Published
Abstract [en]

ABSTRACT The use of glass as a structural material has increased in the built environment over the last decades. Despite the large number of research projects and studies, it still poses difficulties in structural design. This particularly applies to the behaviour of glass in fire and under elevated temperatures since the available data on temperature dependent mechanical and thermal properties of glass is still limited. This contribution provides a brief overview of material properties of glass at elevated temperature and elaborates on current requirements for the fire safety included in standards.

Keywords
structural glass, elevated temperature, fire, structural design
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36097 (URN)10.1002/cepa.952 (DOI)
Conference
Volume 2, Issue 5-6ENGINEERED TRANSPARENCY 2018 Glass in Architecture and Structural Engineering
Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2019-03-06Bibliographically approved
Nasr, A., Larsson Ivanov, O., Björnsson, I., Johansson, J., Honfi, D. & Kjellström, E. (2018). Climate change impact on safety and performance of existing and future bridges. In: Proceedings of the Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE 2018): . Paper presented at Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE 2018), Ghent, Belgium, 28-31 October 2018..
Open this publication in new window or tab >>Climate change impact on safety and performance of existing and future bridges
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2018 (English)In: Proceedings of the Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE 2018), 2018Conference paper, Published paper (Refereed)
National Category
Civil Engineering
Identifiers
urn:nbn:se:ri:diva-37550 (URN)
Conference
Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE 2018), Ghent, Belgium, 28-31 October 2018.
Available from: 2019-01-24 Created: 2019-01-24 Last updated: 2019-01-29Bibliographically approved
Honfi, D., Williams Portal, N., Leander, J., Larsson Ivanov, O., Björnsson, Í., Plos, M., . . . Gabrielsson, H. (2018). Inspection and monitoring of bridges in Sweden. Borås
Open this publication in new window or tab >>Inspection and monitoring of bridges in Sweden
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2018 (English)Report (Other academic)
Abstract [en]

This report provides an overview about recent research activities and current practice concerning inspection and monitoring of the structural performance of bridges and the related decision-making process. A brief review of common methods of collecting information on structural performance of bridges is presented, followed by a description of the use of the information collected in structural analysis and maintenance planning. An overview about the state of the art is given including recent scientific developments. Finally, the current Swedish practice for bridge management is presented.

Place, publisher, year, edition, pages
Borås: , 2018. p. 51
Series
RISE Rapport ; 2018:25
Keywords
condition assessment, inspection methods, structural health monitoring, bridge maintenance
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:ri:diva-33856 (URN)978-91-88695-62-8 (ISBN)
Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2019-01-22Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5879-7305

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