Fire safety in the North/South Line project. Designing measures for fire resistance in infrastructure
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1 Fire safety in the North/South Line project Designing measures for fire resistance in infrastructure 15 april 2015
2 Prologue Separate contractors for concrete works and finishing works Safety requirements defined during concrete works Fire protection of stations to be handled in finishing phase
3 Challenge Handling changing safety requirements Designing fire resistance in finishing phase How? Team of fire safety and structural engineers from client and contractor working together Define approach together and make it SMART Keep authorities informed on approach and progress
4 Approach definition of station/tunnel Building permit station/tunnel Building permit defines station locations (formal) Bored tunnel is clearly defined Remaining parts: structural characteristics (e.g. dilatations) Example near Rokin station Tunnel (bored) Station Tunnel (other)
5 Approach thermal load on structure Building permit station/tunnel Definition of starting points Safety strategy: safe haven principle Make sure metro stops at station Stations are safe havens: more robust safety measures Fire scenario based on safety strategy and fire load Metro fire in station/tunnel Compartment with normal fire load Compartment with limited fire load
6 tunnel station Metro fire Metro fire Low fire load Normal fire load Safe haven NSL curve EUR 120 ISO 90 ISO 120 Approach fire curve Building permit station/tunnel Definition of starting points Determination of thermal load Fire curve from thermal load Station: Metro fire: EUREKA 120 Low fire load: ISO 90 Normal fire load: ISO 120 Tunnel: Metro fire: specific curve NSL (rolling stock based)
7 Approach demarcation in station (1) Building permit station/tunnel Definition of starting points Determination of thermal load Fire curve from thermal load per station per member Station: low fire load metro fire ISO 90 EUR 120 Direct area of influence?
8 Approach demarcation in station (2) Building permit station/tunnel Definition of starting points Determination of thermal load Fire curve from thermal load per station per member Direct area of influence External flaming model based on Law/EC model Realistic worst-case scenario based on fully developed metro fire Safety factors applied EUREKA (metro fire) is contact surface of the flame with structure
9 Approach fire resistance per station per member mixture loading cover Planning Ultimate (accepted) limit state concrete works moisture Proven considerations Interface temperature spalling Requirements: Temperature criteria for concrete and steel (durability) No concrete spalling Conclusion spalling: Spalling behaviour can not be modelled/predicted yet (progressive insight) and concrete structure already exists Assess spalling behaviour using in-situ fire tests Cost Requirements on products (SMART) Efectis
10 Air + water gas Spalling of concrete Liquid water Spalling: evaporating water volume increase pressure Parameters that affect spalling: Moisture content Mixture composition and strength (permeability & porosity) Mechanical loading Here: moisture, high strength, low permeability, high load
11 Assess spalling in-situ practical approach Choose worst-case and most representative concrete mixture(s) Choose worst-case loading conditions Assess spalling behaviour (protected structure) Find non-spalling result
12 Assess spalling in-situ mobile furnace 36 fire tests in 5 underground stations and immersed tunnel below IJ Resulting design interface temperatures from 200 C to 400 C Low temperatures caused by high concrete strength, loading and mixture composition (permeability / not designed for non-spalling) Efectis Efectis
13 Efectis Assess spalling in-situ Spalling!
14 Approach final design per station per member Planning Ultimate (accepted) limit state concrete works Proven considerations Cost Requirements on products (SMART) Design mixture loading cover moisture Interface temperature spalling Fire test results With fire test results: SMART requirements for products Passive fire protection product can be chosen Required thickness based on existing (laboratory) fire test data Decision: Spalling in ISO zone omitted in line with Eurocode
15 Conclusions / recommendations Changing requirements occurred during the construction process Cooperation between client and contractor Was experienced as an exciting and interesting period Keep authorities involved in the process Not only necessary but helpful as well Design/assess fire resistance & spalling behaviour early in the process
16 Thank you for your attention.... and see you on Friday at the site-visit
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