Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 67) Show all publications
Honfi, D., Larsson Ivanov, O., Leander, J. & Björnsson, I. (2019). A practical approach for supporting decisions in bridge condition assessment and monitoring. In: 20th Congress of IABSE, New York City 2019: The Evolving Metropolis - Report. Paper presented at 20th IABSE Congress, New York City 2019: The Evolving Metropolis, 4 September 2019 through 6 September 2019 (pp. 2137-2142). International Association for Bridge and Structural Engineering (IABSE)
Open this publication in new window or tab >>A practical approach for supporting decisions in bridge condition assessment and monitoring
2019 (English)In: 20th Congress of IABSE, New York City 2019: The Evolving Metropolis - Report, International Association for Bridge and Structural Engineering (IABSE) , 2019, p. 2137-2142Conference paper, Published paper (Refereed)
Abstract [en]

In this contribution a practical and rational decision-making approach is presented to be applied for common bridges typically managed by public authorities. The authors have developed a model with the intention to be applicable for practical cases for common bridges in the daily work of bride operators responsible for a large number of assets, yet still maintain the principles of more generic frameworks based on probabilistic decision-theory. Three main attributes of the verification of sufficiency of structural performance are considered, namely: 1) the level of sophistication of modelling performance, 2) the degree of verification and acceptance criteria in terms of dealing with uncertainties and consequences, 3) the extent of information is obtained and incorporated in the verification. The simplicity of the approach is demonstrated through an illustrative case study inspired by practical condition assessment decision problems. It is argued that in practical cases it may be desirable to utilize less advanced methods owing to constraints in resources or lack of reliable data (e.g. based on structural health monitoring or other on-site measurement techniques). 

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering (IABSE), 2019
Keywords
Bridges, Condition assessment, Decision-making, Monitoring, Condition monitoring, Decision theory, Structural health monitoring, Uncertainty analysis, Acceptance criteria, Condition assessments, Generic frameworks, On-site measurement, Probabilistic decisions, Public authorities, Rational decision making, Structural performance, Decision making
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40877 (URN)2-s2.0-85074455075 (Scopus ID)9783857481659 (ISBN)
Conference
20th IABSE Congress, New York City 2019: The Evolving Metropolis, 4 September 2019 through 6 September 2019
Note

Funding details: Federal Agency for Science and Innovation, FASI; Funding details: Energimyndigheten; Funding details: Trafikverket; Funding details: Vetenskapsrådet, VR; Funding text 1: The authors acknowledge the financial support If the results of e2 are still unacceptable, there is still provided by the Swedish Transport Administration an option to apply level 3 assessment e3 with a (Trafikverket) and the strategic innovation 90.9% chance to provide acceptable results, i.e. programme InfraSweden2030, a joint effort of indicate sufficient structural performance. If that Sweden's Innovation Agency (Vinnova), the would be the case, the calculated probability of Swedish Research Council (Formas) and the failure would be 9.9188e5, leading to an expected Swedish Energy Agency (Energimyndigheten).

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved
Cabrero, J. M., Honfi, D., Jockwer, R. & Yurrita, M. (2019). A probabilistic study of brittle failure in dowel-type timber connections with steel plates loaded parallel to the grain. Wood Material Science and Engineering, 14(5), 298-311
Open this publication in new window or tab >>A probabilistic study of brittle failure in dowel-type timber connections with steel plates loaded parallel to the grain
2019 (English)In: Wood Material Science and Engineering, Vol. 14, no 5, p. 298-311Article in journal (Refereed) Published
Abstract [en]

Dowel-type connections in timber structures should be typically designed in a way that, if the load bearing capacity is exceeded, desirable ductile failure should likely occur, i.e. yielding of the metal dowel or embedment of the timber. However, the probability of brittle failures cannot be completely avoided in many cases. If the connection is loaded parallel to the grain direction, splitting, row-shear, plug/block shear and tensile failure are examples of such brittle failure modes. To ensure a beneficial structural performance locally and sufficient structural robustness globally, the probability of such brittle failures should be kept at a sufficiently low level. However, in the current version of EN1995, the probability of such failure is not considered explicitly. The final aim of the presented research study is to develop a rational approach for the consideration of brittle failure in timber connections with dowel-type fasteners and steel plates loaded parallel to the grain, consistently with the partial factor method. As a first step, a probabilistic model has been used to study the susceptibility to brittle failure and provide a rational basis for the calibration of a “brittle overstrength factor”. The results of this study are reported in the current contribution.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2019
Keywords
Dowel-type connections, brittle failure, structural reliability
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39704 (URN)10.1080/17480272.2019.1645206 (DOI)2-s2.0-85073487458 (Scopus ID)
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2020-01-10Bibliographically approved
Nasr, A., Björnsson, I., Ivanov, O. L., Johansson, J., Honfi, D. & Kjellström, E. (2019). A qualitative prioritization of the risks imposed on bridges due to climate change. In: IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report. Paper presented at IABSE Symposium 2019 Guimaraes: Towards a Resilient Built Environment - Risk and Asset Management, 27 March 2019 through 29 March 2019 (pp. 80-87). International Association for Bridge and Structural Engineering (IABSE)
Open this publication in new window or tab >>A qualitative prioritization of the risks imposed on bridges due to climate change
Show others...
2019 (English)In: IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report, International Association for Bridge and Structural Engineering (IABSE) , 2019, p. 80-87Conference paper, Published paper (Refereed)
Abstract [en]

Climate change and its impacts on infrastructures may seriously affect the functionality of societies. Despite the alarming potential consequences climate change pose, not enough effort has been directed towards averting these impacts or managing them in some other way (e.g. mitigation, reduction, etc.). Well-functioning infrastructure networks play a key role in societies’ resilience and their ability to cope with climate-induced hazards. Therefore, ensuring the efficient performance of infrastructure networks, even during climate related emergencies, is central to the resilience of societies in the face of climate change. At the heart of a resilient transportation infrastructure network lays robust bridge structures. This paper builds on previous work where the potential risks from climate change on bridges were surveyed. Here, a qualitative risk prioritization scheme for bridges to rank these risks is presented. The aim of this work is hence to provide a tool for determining which of these risks are more worthy of closer investigation. The suggested framework is based on the basic elements of risk; i.e. hazard, exposure, vulnerability, and consequences. Several indices reflecting these four components and their different characteristics are introduced. Subsequently, a method for ranking the different risks based on these indices is presented. This framework can be used to optimize investments in adapting bridges to climate change.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering (IABSE), 2019
Keywords
Bridge, Climate change, Infrastructure, Risk prioritization, Transportation
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38912 (URN)2-s2.0-85065248204 (Scopus ID)9783857481635 (ISBN)
Conference
IABSE Symposium 2019 Guimaraes: Towards a Resilient Built Environment - Risk and Asset Management, 27 March 2019 through 29 March 2019
Note

Funding text 1: Innovation Agency ?Vinnova ?? the Swedish transport infrastructureadaptationRobust prioritizationframeworkfor Research Council ?Formas ? ? and the Swedish investments under uncertainty of climate Energy Agency 縀Energimyndigheten缃堀 Any change ? ASCE ?ASME J ? Risk Uncertainty Eng ?

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-08-13Bibliographically approved
Nasr, A., Björnsson, I., Honfi, D., Larsson Ivanov, O., Johansson, J. & Kjellström, E. (2019). A review of the potential impacts of climate change on the safety and performance of bridges. Sustainable and Resilient Infrastructure
Open this publication in new window or tab >>A review of the potential impacts of climate change on the safety and performance of bridges
Show others...
2019 (English)In: Sustainable and Resilient Infrastructure, ISSN 2378-9689Article in journal (Refereed) Epub ahead of print
Abstract [en]

ABSTRACTAn overabundance of evidence, both observational and from model projections, indicate that changes to the climate system are taking place at unprecedented rates. Although the magnitudes of these changes involve large uncertainties, the fact that our climate is changing is unequivocal. To ensure an unimpaired functionality of our societies,it is therefore of crucial importance to study the potential climate change impacts on infrastructure. Taking into account that bridges have a considerably long service life, it is of direct relevance to ascertain their reliable performance against climate change risks. This paper synthesizes the findings of over 190 research articles to identify the potential risks climate change may pose on bridges. Over 30 potential risks, supported by pertinent previous bridge damage (or failure) cases, are identified, categorized, and linked to the projected future climate changes. The identified risks can be used as a basis for future risk prioritization by bridge managers.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38669 (URN)10.1080/23789689.2019.1593003 (DOI)
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2019-08-12Bibliographically approved
Shu, J., Honfi, D., Plos, M., Zandi, K. & Magnusson, J. (2019). Assessment of a cantilever bridge deck slab using multi-level assessment strategy and decision support framework. Engineering structures, 200, Article ID 109666.
Open this publication in new window or tab >>Assessment of a cantilever bridge deck slab using multi-level assessment strategy and decision support framework
Show others...
2019 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 200, article id 109666Article in journal (Refereed) Published
Abstract [en]

A Multi-Level Assessment Strategy has previously been proposed and proved feasible for structural analysis of existing RC slabs. In this paper, the Multi-Level Assessment Strategy, which focuses on sophisticated structural analysis, was used to investigate the load-carrying capacity and structural behaviour of a composite bridge with an RC bridge deck slab subjected to a concentrated load. In addition to more sophisticated structural analysis, improved knowledge content about the structure and more advanced models for uncertainty consideration were also incorporated in a systematic way for higher levels of assessment. Furthermore, a decision support system was adopted, in which the cost for different alternatives regarding if and how the assessment should be enhanced with respect to model sophistication, knowledge content and modelling uncertainty were compared in a systematic way. The results show not only that the load-carrying capacity and the structural behaviour can be assessed with different level of detailing, but also that the cost for each level of assessment can be evaluated with a decision support system, facilitating more sustainable management of infrastructure. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Cantilever bridge deck slab, Decision support framework, Multi-level assessment, Shear and punching, Artificial intelligence, Bridge decks, Cantilever bridges, Load limits, Loads (forces), Nanocantilevers, Structural analysis, Uncertainty analysis, Concentrated load, Knowledge content, RC bridges, RC slab, Structural behaviour, Sustainable management, Decision support systems
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39973 (URN)10.1016/j.engstruct.2019.109666 (DOI)
Note

 Funding details: Energimyndigheten; Funding details: Trafikverket; Funding details: Vetenskapsrådet, VR; Funding text 1: The authors acknowledge the financial support provided by the Swedish Transport Administration (Trafikverket) and the strategic innovation programme InfraSweden2030, a joint effort of Sweden's Innovation Agency (Vinnova), the Swedish Research Council (Formas) and the Swedish Energy Agency (Energimyndigheten). Contribution from adjunct professor Morgan Johansson from Chalmers University of Technology is appreciated for the inspiring discussion.

Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved
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: 2019-08-12Bibliographically approved
Nasr, A., Kjellström, E., Björnsson, I., Honfi, D., Ivanov, O. & Johansson, J. (2019). Bridges in a changing climate: a study of the potential impacts of climate change on bridges and their possible adaptations. Structure and Infrastructure Engineering
Open this publication in new window or tab >>Bridges in a changing climate: a study of the potential impacts of climate change on bridges and their possible adaptations
Show others...
2019 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980Article in journal (Refereed) Epub ahead of print
Abstract [en]

Climate change may have multifaceted impacts on the safety and performance of infrastructure. Accounting for the different ways in which potential climate change scenarios can affect our infrastructure is paramount in determining appropriate adaptation and risk management strategies. Despite gaining some attention among researchers in recent years, this research area is still largely uninvestigated. Several studies have indicated bridges to be especially susceptible to the effects of climate change. This article presents the potential impacts of climate change on bridges and combines the findings of close to 70 research articles to construct a broad list of their possible adaptation techniques. Although this study focuses on bridges, many of the presented climate change impacts and their adaptations are of relevance also to other types of infrastructure.

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2019
Keywords
adaptation, adaptation options, bridges, Climate change, climate change adaptation, climate change impacts, climate-related risks, infrastructure safety, risk, Risk management, Risk perception, Risks, Safety engineering, Climate change impact, Climate related risks
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40633 (URN)10.1080/15732479.2019.1670215 (DOI)2-s2.0-85073993361 (Scopus ID)
Note

Funding details: Energimyndigheten; Funding details: Trafikverket; Funding details: Vetenskapsrådet, VR; Funding text 1: The authors gratefully acknowledge the financial support provided by the Swedish Transport Administration (Trafikverket) and the strategic innovation program InfraSweden2030, a joint effort of Sweden's Innovation Agency (Vinnova), the Swedish Research Council (Formas) and the Swedish Energy Agency (Energimyndigheten). The first author would also like to thank Oskar Ranefjärd for providing assistance in translating Liljegren ( 2016 ). Any opinions, findings, or conclusions stated herein are those of the authors and do not necessarily reflect the opinions of the financiers.

Available from: 2019-11-11 Created: 2019-11-11 Last updated: 2019-11-11Bibliographically 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: 2019-08-12Bibliographically 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, 15(6), 711-724
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 1744-8980, Vol. 15, no 6, p. 711-724Article in journal (Refereed) Published
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: 2019-08-12Bibliographically approved
Stepinac, M., Rajcic, V. & Honfi, D. (2019). Decision analysis and scenarios for the assessment of existing timber structures. In: IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report. Paper presented at IABSE Symposium 2019 Guimaraes: Towards a Resilient Built Environment - Risk and Asset Management, 27 March 2019 through 29 March 2019 (pp. 479-486). International Association for Bridge and Structural Engineering (IABSE)
Open this publication in new window or tab >>Decision analysis and scenarios for the assessment of existing timber structures
2019 (English)In: IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report, International Association for Bridge and Structural Engineering (IABSE) , 2019, p. 479-486Conference paper, Published paper (Refereed)
Abstract [en]

Condition assessment of existing timber structures is typically followed by a decision about intervention options, and consequently comparing various possible scenarios. These decisions are based on the updated knowledge obtained through the assessment. Condition assessments, however, can be done in multiple ways, e.g. basic visual assessment of a structure, assessment with various destructive, non-destructive and semi-destructive testing methods, interpretation of a data from structural health monitoring, various levels of structural modelling and safety verification formats. The present paper discusses how pre-posterior decision analysis can guide decisions concerning the condition assessment of timber structures by selecting appropriate assessment procedures and subsequent maintenance actions.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering (IABSE), 2019
Keywords
Condition assessment, Heritage, NDT, SDT, Timber structures, Value of information
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38907 (URN)2-s2.0-85065250247 (Scopus ID)9783857481635 (ISBN)
Conference
IABSE Symposium 2019 Guimaraes: Towards a Resilient Built Environment - Risk and Asset Management, 27 March 2019 through 29 March 2019
Note

Conference code: 147396; Export Date: 28 May 2019; Conference Paper; Correspondence Address: Stepinac, M.; University of ZagrebCroatia; email: mstepinac@grad.hr

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-08-12Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5879-7305

Search in DiVA

Show all publications
v. 2.35.9