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Honfi, D., Sjöström, J., Bedon, C. & Kozłowski, M. (2022). Experimental and Numerical Analysis of Thermo-Mechanical Behaviour of Glass Panes Exposed to Radiant Heating. Fire, 5(4), Article ID 124.
Open this publication in new window or tab >>Experimental and Numerical Analysis of Thermo-Mechanical Behaviour of Glass Panes Exposed to Radiant Heating
2022 (English)In: Fire, ISSN 2571-6255, Vol. 5, no 4, article id 124Article in journal (Refereed) Published
Abstract [en]

Despite much research and applications, glass material and its use in buildings is still challenging for engineers due to its inherent brittleness and characteristic features such as sensitivity to stress concentrations, reduction in strength over time and from temperature, and breakage due to the stresses that may build up because of thermal gradients. This paper presents the results of an original test series carried out on monolithic glass panes with the dimensions of 500 × 500 mm2 and different thicknesses, under the exposure to radiant heating. The research study also includes a one-dimensional (1D) heat transfer model and a numerical, three-dimensional (3D) thermo-mechanical model that are used to investigate in greater detail the phenomena observed during the experiments. As shown, the behaviour of glass under radiant heating is rather complex and confirms the high vulnerability of this material for building applications. The usability and potential of thermo-mechanical numerical models is discussed towards experimental feedback. © 2022 by the authors.

Place, publisher, year, edition, pages
MDPI, 2022
Keywords
finite element modelling, structural fire safety, structural glass, thermo-mechanical modelling
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:ri:diva-60154 (URN)10.3390/fire5040124 (DOI)2-s2.0-85137332895 (Scopus ID)
Note

 Funding details: VINNOVA, 2016-04218; Funding text 1: This research was carried out within the “Safe and durable timber-glass building components” project funded by Vinnova (Sweden’s Innovation Agency) via the Smart Housing Småland innovation arena for glass and wood, grant number 2016-04218. The APC was funded by C.B.

Available from: 2022-09-29 Created: 2022-09-29 Last updated: 2023-05-22Bibliographically approved
Larsson Ivanov, O., Björnsson, I., Honfi, D. & Leander, J. (2022). The practical value of structural health information for time dependence in bridge maintenance. Structure and Infrastructure Engineering, 18(4), 476-491
Open this publication in new window or tab >>The practical value of structural health information for time dependence in bridge maintenance
2022 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 18, no 4, p. 476-491Article in journal (Refereed) Published
Abstract [en]

For practical decisions on common recurring maintenance actions, the information from routine inspections form a decision basis for the bridge manager. It is often difficult to assess whether this information is sufficient for deciding on a repair action, or if more information is needed. For many bridges the information for supporting decisions may be limited, although those bridges cause large yearly maintenance costs for the society. The purpose of the study presented in this paper is to show how two different models for decision making based on Bayesian decision theory, a point-in-time decision model and a sequential updating decision model, can be used to improve the decision-making process for common maintenance decisions. The models use information from routine inspections and incorporates time dependent aspects such as material degradation and time value of money to improve the decision-making process. The focus is on presenting the methodology with a case study of a concrete bridge in Sweden where the edge beams may have to be replaced. Three assessment approaches are considered: (i) no assessment, (ii) desktop evaluation and (iii) measurements. The main finding is that sequential updating decision making will provide a higher benefit than a point-in-time decision, and thus give higher Value of Information. This value becomes even higher when the measurements are selected for the assessment. The results also show that the edge beams should be replaced. The general approach presented can be applicable to many decision scenarios related to maintenance of deteriorating structures.

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2022
Keywords
Bridge management, concrete, decision-making, point-in-time decision, sequential decision making, time-dependence, utility, value of Information
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:ri:diva-52918 (URN)10.1080/15732479.2021.1890141 (DOI)2-s2.0-85101744035 (Scopus ID)
Available from: 2021-04-09 Created: 2021-04-09 Last updated: 2023-02-15Bibliographically approved
Nasr, A., Björnsson, I., Honfi, D., Larsson Ivanov, O., Johansson, J. & Kjellström, E. (2021). A review of the potential impacts of climate change on the safety and performance of bridges. Sustainable and Resilient Infrastructure, 6(3-4), 192
Open this publication in new window or tab >>A review of the potential impacts of climate change on the safety and performance of bridges
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2021 (English)In: Sustainable and Resilient Infrastructure, ISSN 2378-9689, Vol. 6, no 3-4, p. 192-Article in journal (Refereed) Published
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, 2021
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-38669 (URN)10.1080/23789689.2019.1593003 (DOI)
Note

The authors acknowledge the financial support provided by the Swedish Transport Administration 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). 

Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2023-07-07Bibliographically approved
Blomqvist, L., Honfi, D., Johansson, M., Ziethén, R., Crocetti, R. & Norén, J. (2021). DEVELOPMENT OF NOVEL STRUCTURAL CONNECTIONS –INSPIRATION FROM FURNITURE INDUSTRY. In: World Conference onTimber Engineering (WCTE) 2021: . Paper presented at World Conference onTimber Engineering (WCTE) 2021. Santiago, Chile
Open this publication in new window or tab >>DEVELOPMENT OF NOVEL STRUCTURAL CONNECTIONS –INSPIRATION FROM FURNITURE INDUSTRY
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2021 (English)In: World Conference onTimber Engineering (WCTE) 2021, Santiago, Chile, 2021Conference paper, Published paper (Refereed)
Abstract [en]

The presented project aims to develop prototypes for building connections inspired by the furniture and interior industry and explore them with representatives from the timber construction industry. The long-term vision is that actors from furniture and building industry together develop a smart system for assembly of building elements, which provide higher precision, faster and more efficient assembly than what is available today. The prototype connectiondeveloped in this project shows that the idea is ripe for full-scale investigation. Laboratory tests showed promising results due to the high failure loads obtained with very high stiffness.

Place, publisher, year, edition, pages
Santiago, Chile: , 2021
Keywords
assembly, connections, CLT
National Category
Wood Science Building Technologies
Identifiers
urn:nbn:se:ri:diva-55834 (URN)
Conference
World Conference onTimber Engineering (WCTE) 2021
Projects
Montageförband på byggarbetsplatsen (Assembly connections on the construction site)
Funder
Vinnova, 2018-04332The Kamprad Family Foundation, 20200013
Available from: 2021-08-12 Created: 2021-08-12 Last updated: 2024-05-17Bibliographically approved
Cristescu, C., Honfi, D., Sandberg, K., Sandin, Y., Shotton, E., Walsh, S. J., . . . Krofl, Ž. (2020). Design for deconstruction and reuse of timber structures – state of the art review.
Open this publication in new window or tab >>Design for deconstruction and reuse of timber structures – state of the art review
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2020 (English)Report (Other academic)
Abstract [en]

This report is a state-of-the-art on timber construction in selected european countries and and discusses technical premises for a potential circular use of timber in building construction, focusing on Design for Deconstruction and Reuse (DfDR) in low-rise timber buildings, up to 3 storeys. It describes the historic and contemporary building techniques of timber buildings in all project countries (Sweden, Finland, Ireland, UK, Spain, Germany, Slovenia) and finds, that all of these countries have a long history of building with timber, but in most regions other materials dominated the housing output from the beginning of the 20th century. Only in the second half of the 20th century timber started gaining importance as a building material in Europe again, with light timber frame construction becoming an important construction system. From the beginning of the 21st century, innovations in the sector started transforming the construction industry. Mass timber products like CLT opened the market for high-rise timber buildings and in some countries office blocks, schools and hotels are built using timber, although the majority of timber construction remains residential. An even more important development might be the uptake of offsite construction, that makes timber construction more accurate, material efficient, fast and it reduces waste. These modern methods of construction are gaining importance in the construction sector of all partner countries and are likely to dominate the European housing output in the future. There will be some regional differences in the level of prefabrication, material choices and designs, so that any design guidelines for DfDR need to be adapted to the regional context. However, modern timber construction is not currently aligned with circular economy principles and is seldomly taking buildings endof-life-into account.

Therefore, the report continues to summarise novel design concepts for deconstruction and reuse, that could be used in modern timber buildings. It outlines that the feasibility as well as the reuse potential depends on the scale of reclaimed components, where larger components and assemblies are often considered beneficial in terms of time, greenhouse gas emissions and waste production. If volumetric or planar units could be salvaged in the future, they also need to be adaptable for altered regulations or standards or alternative functions. It is further necessary that assemblies can be altered within buildings, since different building components have different life expectancies. Various examples for DfDR in buildings with the accompanying design strategies are presented. The buildings in the examples are often designed to be in one place for a limited timeframe and can be deconstructed and re-erected elsewhere without replacement of components. Key-features often include modularity of components, reversible connections, adaptability of the floor-plan and circular procurement. Even though it is evidently possible, the structural reuse of timber is not a wide-spread approach to date. Barriers to the use of reclaimed structural components are mainly a lack in demand for salvaged materials, but also prohibitive building regulations and the lack of design standards. Demolition practices play a crucial role as well and need to be considered in the design of buildings, to avoid damage to the components.

Finally, the report summarises principles and guidelines for DfDR by different authors. As a generic approach an indicator system for deconstructability and reusability could be introduced. Time, Separability, Risk and Safety, Simplicity and Interchangeability are identified5as the main indicators for DfDR, that remain somewhat abstract. As opposed to using a generic indicator system, a more practical approach of assessing DfDR on an individual basis could be taken. This way specific shortcomings of the design can be addressed. But if DfDR found a wider application in the future, this approach may be too time consuming and there is a need for a more directed decision-making tool that can be used during the design phase of buildings to enhance DfDR. As the InFutUReWood project proceeds, it will examine a more granular approach to DfDR, relating it to the actual construction stages used in practice, developing a general template to be appropriated and adjusted to account for regional variations in construction. A strategic matrix is in development which will provide designers with a methodology based on relating principles, strategies and specific tactics to the typical design stages, to aid design decisions that promote DfDR.

Publisher
p. 92
Series
RISE Rapport ; 2020:05
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-52384 (URN)10.23699/bh1w-zn97 (DOI)978-91-89167-67-4 (ISBN)
Available from: 2021-02-10 Created: 2021-02-10 Last updated: 2023-06-08Bibliographically approved
Honfi, D. (2020). Design for deconstruction and reuse of timber structures: state of the art review.
Open this publication in new window or tab >>Design for deconstruction and reuse of timber structures: state of the art review
2020 (English)Report (Refereed)
Identifiers
urn:nbn:se:ri:diva-50135 (URN)
Note

Draft record - To be published.

Available from: 2020-10-28 Created: 2020-10-28 Last updated: 2020-12-01Bibliographically approved
Ahlgren, B., Claesson, Å., Honfi, D., Kardeby, V., Karoumi, R. & Leander, J. (2020). Digitaliseringens möjligheter och utmaningar inom förvaltning och underhållsplanering av broar: Förstudie.
Open this publication in new window or tab >>Digitaliseringens möjligheter och utmaningar inom förvaltning och underhållsplanering av broar: Förstudie
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2020 (Swedish)Report (Other academic)
Abstract [en]

Rapporten behandlar digitalisering – att införa ny digital teknik – i förvaltningsverksamheten av broar. Omfattningen är en förstudie med syftet att identifiera behovet av framtida forskning för en långsiktig utveckling av broförvaltningen. En grundläggande ansats var att en digitalisering ska minska behovet av kostsamma underhållsåtgärder men bibehålla en hög säkerhet för våra broar. Projektets mål var att samla information om digitala informationsmodeller som skapas under investeringsskedet, utvärdera överlämningen av digitala modeller till förvaltningsskedet, och värdera den eventuella nyttan med digital informationsinsamling för tillståndsbedömning och underhållsplanering. En viktig del av detta var beskrivningen av dagens förvaltningssystem och hur det skulle kunna utvecklas. Studierna har bedrivits genom en enkätundersökning med respondenter från konsultfirmor aktiva inom broprojektering, intervjuer med tekniska experter och litteratursökningar. Resultatet visar att projekteringen av broar idag huvudsakligen görs genom byggnads-informationsmodellering (BIM). Inriktningen är mot byggskedet där samordning och kommunikation bedöms vara de största nyttorna. Överlämningen till förvaltningen består dock av relationsritningar i formen av enkla ritningsfiler. Trots att Trafikverkets strategi för BIM beskriver att en informationsmodell bör leva kvar under hela brons livslängd, finns det tveksamheter huruvida en modell från projekteringen är lämplig som förvaltningsmodell. Istället lyfts andra metoder fram för att skapa en modell av det byggda utförandet. Till exempel optiska metoder för skanning och fotogrammetri. Förvaltningssystemen bör utvecklas med funktioner för att lagra och tillgängliggöra stora mängder digital information från sensorer maskinella inspektioner. Syftet är att minska osäkerheterna i det byggda utförandet och graden av nedbrytning, för att slutligen skapa ett bättre underlag för beslut om åtgärder. Ett framtida scenario är en digital tvilling som speglar den verkliga konstruktionen och uppdateras kontinuerligt genom sensordata. Gällande hårdvara för mätningar behöver sensorer och system utvecklas med avseende på energiförbrukning, energiskördning och underhållsåtgärder, t.ex. genom kombinationer av utbytbara komponenter med kort livslängd och andra delar med lång livslängd. Fiberoptiska sensorer visar på lovande egenskaper men utveckling behövs för att göra dem mer kostnadseffektiva i relation till konventionella sensorer.

Publisher
p. 50
Series
KTH Royal Institute of Technology ; TRITA-ABE-RPT-217
Keywords
Digitalisation, Bridge management, Digital Twin, Information modelling, BIM, Condition assessment, Digitalisering, broförvaltning, digital tvilling, informationsmodeller, tillståndsbedömning, Civil Engineering, Samhällsbyggnadsteknik
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:ri:diva-58960 (URN)
Available from: 2022-03-29 Created: 2022-03-29 Last updated: 2023-06-08Bibliographically approved
Fjellgaard Mikalsen, R., Durgun, Ö., Williams Portal, N., Orosz, K., Honfi, D. & Reitan, N. K. (2020). Efficient emergency responses to vehicle collision, earthquake, snowfall, and flooding on highways and bridges: A review. Journal of Emergency Management, 18(1), 51-72
Open this publication in new window or tab >>Efficient emergency responses to vehicle collision, earthquake, snowfall, and flooding on highways and bridges: A review
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2020 (English)In: Journal of Emergency Management, ISSN 1543-5865, Vol. 18, no 1, p. 51-72Article in journal (Refereed) Published
Abstract [en]

This review article analyzes factors affecting emergency response to hazardous events on highways and their bridges, with focus on man-made and natural scenarios: heavy vehicle collision with a bridge, earthquake, heavy snowfall, and flooding. For each disaster scenario, selected historical events were compiled to determine influential factors and success criteria for efficient emergency response, both related to organizational and technical measures. This study constituted a part of a resilience management process, recently developed and demonstrated within the European Union (EU)-funded H2020 project IMPROVER and can be a useful approach in aiding operators of transportation infrastructure to improve their resilience to emergency incidents.

Place, publisher, year, edition, pages
NLM (Medline), 2020
Keywords
article, earthquake, European Union, flooding, highway, human
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-43969 (URN)10.5055/jem.2020.0450 (DOI)2-s2.0-85079106935 (Scopus ID)
Available from: 2020-02-17 Created: 2020-02-17 Last updated: 2023-06-07Bibliographically approved
Honfi, D., Björnsson, I., Larsson Ivanov, O. & Leander, J. (2020). Informed successive condition assessments in bridge maintenance. Journal of Civil Structural Health Monitoring, 10, 729-737
Open this publication in new window or tab >>Informed successive condition assessments in bridge maintenance
2020 (English)In: Journal of Civil Structural Health Monitoring, ISSN 2190-5452, Vol. 10, p. 729-737Article in journal (Refereed) Published
Abstract [en]

The condition assessment of bridges considers a combination of information from different sources rendering multiple levels of assessment possible. This paper illustrates how successive condition assessment strategies increase the expected utility compared to single choice decisions through Bayesian inference. Multiple levels of assessment allow for additional possibilities for obtaining structural health information and updating one’s beliefs about structural condition. Thus, more informed decision-making is possible with respect to the gain in accuracy versus the costs of the assessment options. The paper aims to introduce how the successive approach can be implemented and in which scenarios it provides an increase in expected utility in comparison to one instant decision. To highlight this, a few pedagogical numerical examples are provided. © 2020, The Author(s).

Place, publisher, year, edition, pages
Springer, 2020
Keywords
Bridge maintenance, Condition assessment, Informed decision making, SHI, VoI, Bayesian networks, Decision making, Inference engines, Bayesian inference, Condition assessments, Expected utility, Informed decision, Multiple levels, Structural condition, Structural health, Bridges
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-45159 (URN)10.1007/s13349-020-00415-2 (DOI)2-s2.0-85086718804 (Scopus ID)
Available from: 2020-07-08 Created: 2020-07-08 Last updated: 2021-06-08Bibliographically approved
Bedon, C., Stochino, F. & Honfi, D. (2020). Special issue on "buildings and structures under extreme loads". Applied Sciences, 10(16), Article ID 5676.
Open this publication in new window or tab >>Special issue on "buildings and structures under extreme loads"
2020 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 10, no 16, article id 5676Article in journal (Refereed) Published
Abstract [en]

Exceptional loads on buildings and structures may have different causes, including high-strain dynamic effects due to natural hazards, man-made attacks, and accidents, as well as extreme operational conditions (severe temperature variations, humidity, etc.). All these aspects can be critical for specific structural typologies and/or materials that are particularly sensitive to unfavorable external conditions. In this regard, dedicated and refined methods are required for their design, analysis, and maintenance under the expected lifetime. However, major challenges are usually related to the structural typology and materials object of study, with respect to the key features of the imposed design loads. Further issues can be derived from the need for the mitigation of adverse effects or retrofit of existing structures, as well as from the optimal and safe design of innovative materials/systems. Finally, in some cases, no appropriate design recommendations are currently available in support of practitioners, and thus experimental investigations (both on-site or on laboratory prototypes) can have a key role within the overall structural design and assessment process. This Special Issue presents 19 original research studies and two review papers dealing with the structural performance of buildings and structures under exceptional loads, and can represent a useful answer to the above-mentioned problems.

Place, publisher, year, edition, pages
MDPI AG, 2020
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-48302 (URN)10.3390/app10165676 (DOI)2-s2.0-85089913646 (Scopus ID)
Note

Export Date: 8 September 2020; Editorial; Funding text 1: This Special Issue would not be possible without the contributions of various talented authors, hardworking and professional reviewers, and dedicated editorial team members of the Applied Sciences journal. We would like to take this opportunity to record our sincere gratefulness to all the involved scientists, both authors and reviewers, for their valuable contribution to this collection. Finally, we place on record our gratitude to the editorial team of Applied Sciences, and special thanks to Felicia Zhang, Assistant Managing Editor for Applied Sciences.

Available from: 2020-09-09 Created: 2020-09-09 Last updated: 2021-02-01Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5879-7305

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