Brandsäkerhet hos. ny europeisk handbok

Transkript

1 Brandsäkerhet hos träkonstruktioner ny europeisk handbok Birgit Östman SP Trätek, Stockholm SIS Brandseminarium Stockholm 20 januari 2011

2 Fire safety in timber buildings Den allra första handboken på europeisk nivå Resultat av projektet FireInTimber 14 partners i nio länder Finansierat av WoodWisdom-Net och europeisk träindustri Kortversion på sju språk

3 Fire Safety in Timber Buildings Technical guideline for Europe Based on latest knowledge Aim to facilitate national implementation of the new European system for fire safety Target groups Designers Engineers Architects Authorities Educational bodies Wood and building industries

4 Fire safety in timber buildings Chapters: 1. Timber buildings 2. Fire safety in buildings 3. European system for construction products 4. Wood products as linings, floorings, claddings and facades 5. Separating timber structures 6. Load-bearing timber structures 7. Timber connections 8. Fire stops, service installations and detailing in timber structures 9. Novel products and their implementation or application 10. Active fire protections 11. Performance based design 12. Quality of construction ti workmanship and inspection

5 Timber constructions 1. Timber buildings Sustainability Fire safety

6 Möjligheter att bygga flervåningshus med trästomme i Europa

7 2. Fire safety in buildings Fire action and fire load Concept Fire Safety Objective Safety of life Loss prevention Fire scenarios Environmental protection Fire safety objectives Strategy Systems Means of protection and evacuation safety Components Means of fulfilling fire safety objectives

8 3. European system for construction products Essential requirements in CPD European harmonisation of structural design, Eurocodes European harmonisation of fire classification systems CPD and its essential requirement on fire safety in the case of fire Interpretative documents (ID) with classes for fire performance Testing and classification CEN TC 127 Fire safety in buildings Calculation rules CEN TC 250 / SC 5 Structural Eurocodes / Timber Structures Products

9 4. Wood products as linings, floorings, claddings and facades Reaction to fire classification in end uses, CWFT Improved reaction to fire performance Wood coverings with fire protection ability Wooden facades Nyhet: Europeiska K klasser kan uppnås med trä

10 5. Separating timber structures News: Improved design method Calculation of the time t ins by adding the contribution to the fire resistance of the different layers ins i = n 1 = tprot,i i= 1 t + t ins,n Cavity insulation Panels Timber studs / beams The time of each layer depends on: Material and thickness of the layer Position of the layer within the assembly The position has to be considered, because layers influence each other t1 t 5 t 1 t 2 t 3 t 4 t 5

11 6. Load-bearing timber structures R, REI News: Cross-laminated timber (CLT) Light timber frame floors with I-joists Improved model for void cavities Model for traditional glass wool in cavities Failure time of claddings Data base for gypsum plasterboards gives generic conservative values The producer may declare values obtained from testing

12 7Ti 7. Timber connections Design method acc to Eurocode 5 Other methods proposed Timber-to-timber connectiuons Steel-to-timber connections mm hp h e1 a2 h Zone d'attache Zone tampon Zone tampon Zone d'attache h a 4 +a fi a 3 a+a 3 fi 3 x a 1 e 1 Pièce moisée de section 50 x t 2 L f t 1 P 1 t 1 P1 P 2 t 2 t1 t1 δ p t2

13 8. Fire stops, p, service installations and detailing Fire stops Installations Structural details

14 9. Novel products and their implementation Performance requirements and potential solutions Procedure for introducing novel products

15 10. Active fire protection Fire dt detectionti and alarm Supression systems Smoke control Fire safety design with sprinklers Nordiskt arbete med regler för tekniska byten pågår

16 11. Performance based design Performance based requirements Fire risk assessment Example of probabilistic approach to assess fire safety VTT Assessment of the acceptability of the design solution Structural performance d char ( r, t) T gas ( r, t) OK HRR developments in each scenario Fire scenarios To define charred depth the dependence between charring rate and temperature is needed Building

17 12. Quality of construction workmanship and inspection Quality control of workmanship Fire safety during construction Control heat/ energy sources Prevent A fire Ignition Control interaction: Source/ fuel Control fuel Fire Safety objectives Manage Bimpact of fire B1 B2 Manage fire Manage exposure Control combustion Limit amount of exposed material Suppress fire Safeguard exposed Control by construction Svenskt arbete med rekommendationer för brandskydd på byggarbetsplats pågår

18 Många spännande byggprojekt: London Schweiz Österrike

19 Europeisk 2010 Två handböcker Nordisk-baltisk 2011

20 Europeisk: Skillnad? Visar hur europeiska krav uppfylls med trä Detaljer för beräkning av träkonstruktioner (Eurokod 5) Nya modeller för att beräkna avskiljande och bärförmåga Nordisk-baltisk: Dessutom Mer i relation till byggnormer Mer praktiska exempel Mindre om detaljerad beräkning På svenska!

21 Tack!