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Östman, Birgit
Publications (10 of 17) Show all publications
Östman, B. (2019). Weathering Effects on Fire Retardant Wood Treatments. In: Samuel L. Manzello (Ed.), Encyclopedia of Wildfires and Wildland-Urban Interface (WUI) Fires: Living edition. Cham: Springer
Open this publication in new window or tab >>Weathering Effects on Fire Retardant Wood Treatments
2019 (English)In: Encyclopedia of Wildfires and Wildland-Urban Interface (WUI) Fires: Living edition / [ed] Samuel L. Manzello, Cham: Springer, 2019Chapter in book (Refereed)
Place, publisher, year, edition, pages
Cham: Springer, 2019
National Category
Forest Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-82328 (URN)10.1007/978-3-319-51727-8_67-1 (DOI)978-3-319-51727-8 (ISBN)
Note

Bidrag till encyklopedi

Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-05-06Bibliographically approved
Östman, B., Brandon, D. & Just, A. (2018). Brandteknisk dimensionering av CLT-konstruktioner. Bygg & teknik (6), 50-53
Open this publication in new window or tab >>Brandteknisk dimensionering av CLT-konstruktioner
2018 (Swedish)In: Bygg & teknik, ISSN 0281-658X, no 6, p. 50-53Article in journal (Other academic) Published
Abstract [sv]

CLT, korslaminerat trä eller KL-trä som det ofta kallas i Sverige är en relativt ny byggprodukt som snabbt blivit känd och uppskattad runt om i världen. Den används främst till stommar i både höga och låga byggnader och bidrar till stabilieringen som är viktig särskilt i högre byggnader.

Brandegenskaperna hos CLT som synligt material i byggnader har klarlagts (Östman B&t 2017), medan forskning om brandteknisk dimensionering av CLT-konstruktioner fortfarande pågår. Denna artikel sammanfattar nuläget.

Place, publisher, year, edition, pages
Stockholm: AB Bygg & Teknik, 2018
Keywords
korslaminerat trä, branddimensionering, konstruktioner
National Category
Construction Management Building Technologies
Identifiers
urn:nbn:se:lnu:diva-77617 (URN)
Available from: 2018-09-26 Created: 2018-09-26 Last updated: 2018-12-03Bibliographically approved
Brandon, D., Schmid, J., Su, J., Hoehler, M., Östman, B. & Kimball, A. (2018). Experimental Fire-Simulator for Post-Flashover Compartment Fires. In: SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK: . Paper presented at SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK. New University of Ulster
Open this publication in new window or tab >>Experimental Fire-Simulator for Post-Flashover Compartment Fires
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2018 (English)In: SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK, New University of Ulster, 2018Conference paper, Published paper (Refereed)
Abstract [en]

The number of talltimber buildings around the world is rapidly increasing as a result of changes inregulations and the development of new engineered timber products. However, dueto the combustibility of timber, the fire safety of tall timber buildings hasbeen questioned. Building regulations for structural elements are based onfixed periods for which specimens shall resist exposure to a ‘standard fire’ ina fire resistance furnace. Because no distinction is made between the exposure in fire resistancetests of combustible and non-combustible specimens, less conventional testingmethods have been used for research of timber structures. Thisstudy aims to identify aspects that are important to simulate realistic fireconditions relevant to assess the structural performance of timber inpost-flashover fires. A test method is developed to replicate conditions incompartment fire tests using a furnace, that results in similar damage typesand rates of damage in the timber specimen. Based on conclusions drawn fromthese tests and test results obtained using other testing methods, theapplicability of fire resistance tests and other non-conventional tests arediscussed.

Place, publisher, year, edition, pages
New University of Ulster, 2018
Keywords
cross laminated timber, compartment fires, fire resistance tests, simualtion
National Category
Construction Management
Identifiers
urn:nbn:se:lnu:diva-77611 (URN)
Conference
SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK
Note

Ej belagd 180910

Available from: 2018-09-08 Created: 2018-09-08 Last updated: 2018-10-04Bibliographically approved
Östman, B., Schmid, J., Klippel, M., Just, A., Werther, N. & Brandon, D. (2018). Fire Design of CLT in Europe. Wood and Fiber Science, 50, 68-82
Open this publication in new window or tab >>Fire Design of CLT in Europe
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2018 (English)In: Wood and Fiber Science, ISSN 0735-6161, Vol. 50, p. 68-82Article in journal (Refereed) Published
Abstract [en]

The fire safety design of cross-laminated timber (CLT or X-Lam) in Europe is governed by the Construction Products Regulation and its essential requirements, as for all other building products. These requirements are mandatory, to be used in all European countries. They include classification systems for reaction to fire of building products, fire resistance of building elements, and structural Eurocodes. The reaction-to-fire performance of CLT in accordance with the European classification system is specified. Higher classes can be reached by chemical treatments, but the durability of the reaction-to-fire performance needs to be fulfilled according to a new European system. The fire resistance design of CLT building elements is not included in Eurocode 5, the structural Eurocode for timber, but can be either tested according to European standards or calculated by using design methods being developed recently. This article provides information about both reaction to fire and fire resistance of CLT in Europe. Furthermore, the importance of proper detailing in building design and in practice is stressed. Finally, performance-based design is introduced and some further research needs suggested.

Place, publisher, year, edition, pages
Society of Wood Science and Technology, 2018
Keywords
Building fires, charring, reaction to fire, fire resistance, detailing, performance-based design
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-77495 (URN)000441731700006 ()2-s2.0-85051796991 (Scopus ID)
Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2019-07-09Bibliographically approved
Hoehler, M., Su, J., Lafrance, P.-S., Bundy, M., Kimball, A., Brandon, D. & Östman, B. (2018). Fire Safety Challenges of Tall Wood Buildings: Large-scale Cross-laminated Timber Compartment Fire Tests. In: SiF 2018– The 10th International Conference on Structures in FireFireSERT, Ulster University, Belfast, UK, June 6-8, 2018: . Paper presented at SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK. New University of Ulster
Open this publication in new window or tab >>Fire Safety Challenges of Tall Wood Buildings: Large-scale Cross-laminated Timber Compartment Fire Tests
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2018 (English)In: SiF 2018– The 10th International Conference on Structures in FireFireSERT, Ulster University, Belfast, UK, June 6-8, 2018, New University of Ulster, 2018Conference paper, Published paper (Refereed)
Abstract [en]

This study investigates the contribution of cross laminated timber (CLT) building elements to compartment fires. Six compartments (9.1 m long × 4.6 m wide × 2.7 m high) were constructed using 175 mm thick 5‑ply CLT structural panels and fire tested using residential contents and furnishings to provide a fuel load density of 550 MJ/m2. The results show that gypsum board can delay or prevent the involvement of the CLT in the fire, and that the ventilation conditions and exposed surface area of the CLT play a decisive role in the outcome of the test. The results highlight the need to use heat-resistant adhesives in cross laminated timber to minimize delamination.

Place, publisher, year, edition, pages
New University of Ulster, 2018
Keywords
cross laminated timber, compartment fires, fire tests, delamination, ventilation
National Category
Construction Management
Identifiers
urn:nbn:se:lnu:diva-77612 (URN)
Conference
SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK
Note

Ej belagd 180910

Available from: 2018-09-08 Created: 2018-09-08 Last updated: 2018-10-04Bibliographically approved
Östman, B. & Mikkola, E. (2018). Guidance on Fire Safety of Bio-Based Facades: COST Action FP 1404,  “Fire Safe Use of Bio-Based Building Products”. Zurich: ETH Zurich
Open this publication in new window or tab >>Guidance on Fire Safety of Bio-Based Facades: COST Action FP 1404,  “Fire Safe Use of Bio-Based Building Products”
2018 (English)Report (Other academic)
Abstract [en]

The use of wooden facade claddings and bio-based insulation materials in external walls are increasing because of esthetical and sustainability reasons. The introduction of performance-based building codes has generally facilitated the wider use of these materials and products in multi-storey buildings, but the use of visible woodas exterior facade claddings is still limited.

Key initiating events of facade fires are a) interior fire spreading to external wall system via external openings,b) exterior fire directly adjacent external wall system igniting the wall due to radiant heat and/or flame impingement,and c) exterior fire spatially separated from external wall system resulting from radiant heat.

Contribution of bio-based façade claddings and insulation materials to fire development and spread can beprevented by using protective methods. Examples of these are protection of insulation products by coverings or layers made of materials with good reaction to fire performance and/or with a sufficient protection capacity and/or prevention of facade cladding fires by hindering flames from a flashover room fire by using fire rated windows, automatic window shutters or sprinklers. Fire stops in ventilation cavities or in order to interrupt acombustible insulation are also effective means of fire protection.

Several wooden facade systems do fulfil at least the European reaction to fire class D-s2, d0. Based on fullscale test results some conclusions and recommendations have been made concerning proper criteria and possible area limits of wooden facades.

Fire retardant treated wood may be used, but the durability of the fire retardant treatments at exterior weather conditions need to be demonstrated in addition to the fire behaviour. The new European standard EN 16755for testing and classification of fire retardant treated timber products durability is suitable for this purpose.

This Guidance document on fire safety of bio-based facades is the result of work within several Task Groupsof the COST Action FP1404 “Fire Safe Use of Bio-Based Building Products” and aims at a common understanding of issues related to the description, design and fire testing facades

Place, publisher, year, edition, pages
Zurich: ETH Zurich, 2018. p. 41
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-82344 (URN)10.3929/ethz-b-000319579 (DOI)
Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-05-06Bibliographically approved
Wiesner, F., Klippel, M., Dagenais, C., Dunn, A., Östman, B., Janssens, M. & Kagiya, K. (2018). Requirements for Engineered Wood Products and their Influence on the Structural Fire Performance. In: WCTE2018, World Conference on Timber Engineering, 20-23 August, Seoul, Republic of Korea: . Paper presented at WCTE2018, World Conference on Timber Engineering, Seoul, Republic of Korea. World Conference on Timber Engineering (WCTE)
Open this publication in new window or tab >>Requirements for Engineered Wood Products and their Influence on the Structural Fire Performance
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2018 (English)In: WCTE2018, World Conference on Timber Engineering, 20-23 August, Seoul, Republic of Korea, World Conference on Timber Engineering (WCTE) , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Engineered wood products e.g. cross-laminated timber (CLT), glued-laminated timber (glulam) and laminated veneer lumber (LVL) are increasingly used as the material of choice for mid-rise to tall construction timber projects. However, the requirements to manufacture these timber elements are considerably different among countries and, consequently, do have an influence on their fire performance. Requirements for sizes of the boards, allowed knot sizes and structural adhesives, among others, are of particular interest. The present paper gives an overview of the production requirements for CLT, glulam and LVL in different countries and discusses how the requirements affect the fire performance of these products.

Place, publisher, year, edition, pages
World Conference on Timber Engineering (WCTE), 2018
Keywords
bio-based products, cross-laminated timber, glued-laminated timber, production requirements, structural fire safety
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-77610 (URN)2-s2.0-85058148907 (Scopus ID)
Conference
WCTE2018, World Conference on Timber Engineering, Seoul, Republic of Korea
Available from: 2018-09-08 Created: 2018-09-08 Last updated: 2019-05-28Bibliographically approved
Östman, B., Brandon, D. & Just, A. (2018). Riktlinjer för egendomsskydd i höga trähus. Bygg & teknik (6), 64-66
Open this publication in new window or tab >>Riktlinjer för egendomsskydd i höga trähus
2018 (Swedish)In: Bygg & teknik, ISSN 0281-658X, no 6, p. 64-66Article in journal (Other academic) Published
Abstract [sv]

Riktlinjer för att minska risken för egendomsskador i flervånings byggnader med trästomme har tagits fram i ett Brandforskprojekt. Riktlinjerna sammanfattas här och är främst tillämpbara för byggnadsklasserna Br1 och Br0 enligt Boverketes byggregler (BBR), men är naturligtvis användbara även för mindre byggnader. Mer utförliga riktlinjer ges i en RISE rapport 2018:46.

En första del av detta arbete var brandstopp i modulbyggnader, som presenterades i Bygg & teknik 2016.

Place, publisher, year, edition, pages
Stockholm: AB Bygg & Teknik, 2018
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-77618 (URN)
Available from: 2018-09-26 Created: 2018-09-26 Last updated: 2019-05-24Bibliographically approved
Karlsson, V., Wärnelöv, M., Dorn, M. & Östman, B. (2017). Brandpåverkan på lastbärande trä-glasväggar. Bygg & teknik, 109(6), 44-47
Open this publication in new window or tab >>Brandpåverkan på lastbärande trä-glasväggar
2017 (Swedish)In: Bygg & teknik, ISSN 0281-658X, Vol. 109, no 6, p. 44-47Article in journal (Other academic) Published
Abstract [sv]

Glas har flera av de egenskaper som eftersöks hos ett bärande material: hög styvhet, hög hållfasthet - och är dessutom transparant! Tillsammans med rätt lim och en träram bildas väggar som klarar stora laster. Linnéuniversitetet i Växjö har forskat inom detta ämne och gjort många tester på glasväggar. Resultaten visar att en bärande glasvägg kan ha lastkapacitet för att klara en bostadslast för 3-4 våningar. Nu har möjligheterna att även klara brandkraven undersökts i ett examensarbete.

Place, publisher, year, edition, pages
Stockholm: Byggteknikförlaget, 2017
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-66121 (URN)
Available from: 2017-09-19 Created: 2017-09-19 Last updated: 2018-05-16Bibliographically approved
Östman, B. & Tsantaridis, L. D. (2017). Durability of the reaction to fire performance of fire-retardant-treated wood products in exterior applications: a 10-year report. International Wood Products Journal, 8(2), 94-100
Open this publication in new window or tab >>Durability of the reaction to fire performance of fire-retardant-treated wood products in exterior applications: a 10-year report
2017 (English)In: International Wood Products Journal, ISSN 2042-6445, E-ISSN 2042-6453, Vol. 8, no 2, p. 94-100Article in journal (Refereed) Published
Abstract [en]

Fire retardants may considerably improve the reaction to fire properties of wood products, but the long term durability needs to be addressed. Several long term studies of fire retardant treated (FRT) wood products over time are presented. They are performed according to a European system based on earlier Nordic and North American systems and include accelerated aging according to different procedures and natural weathering up to 10 years.

Main conclusions are:

• The hygroscopic properties are unchanged compared to untreated wood products for most FRT wood products studied and used commercially

• The reaction to fire properties of FRT wood may be maintained after accelerated and natural aging if the The hygroscopic properties are unchanged compared to untreated wood for most FRT wood retention levels are high enough, but several products lose most of their improved reaction to fire properties during weathering

• Paint systems contribute considerably to weather protection and are usually needed to maintain the reaction to fire performance at exterior applications

Place, publisher, year, edition, pages
Taylor & Francis, 2017
Keywords
Durability; hygroscopicity, reaction to fire;weathering; wood products
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-66076 (URN)10.1080/20426445.2017.1330229 (DOI)000406546900007 ()2-s2.0-85019698479 (Scopus ID)
Available from: 2017-07-03 Created: 2017-07-03 Last updated: 2019-08-29Bibliographically approved
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