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Eurocode 1: Actions on structures –

Eurocode 1: Actions on structures –. Part 1–2: General actions – Actions on structures exposed to fire. Annex A (informative) Parametric temp-time curves. Part of the One Stop Shop program. Introduction. Method of determining a more realistic temperature-time curve

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Eurocode 1: Actions on structures –

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  1. Eurocode 1: Actions on structures – Part 1–2: General actions – Actions on structures exposed to fire • Annex A (informative) • Parametric temp-time curves Part of the One Stop Shop program

  2. Introduction • Method of determining a more realistic temperature-time curve • Valid for compartments • Up to 500m2 of floor area • Without openings in roof • Up to 4m in height

  3. Basic fundamental equation • Temperature-time curves in heating phase are given by: where is the gas temperature in the fire compartment • The “time” is not strictly the time, but an adjusted time based on other factors

  4. Breaking down the equation (“Opening factor”) Density of enclosure boundary This outlines the basis of the equation used Further details of limitations and further provisos are also necessary….. Specific heat of enclosure boundary Thermal conductivity of enclosure boundary Total area of vertical openings on walls Weighted average of window heights on all walls Total area of enclosure (incl. openings)

  5. Different materials in surface layer Layer 2 Layer 1 Fire side Boundary layers of enclosure For layer 1, the subscript 1 is used and similarly for layer 2……

  6. Different materials in surface layer • If < , then • If, however, > then a limit thickness is calculated for the exposed material: If > , then If < , then (We will find an expression for in a few slides time….)

  7. Different materials in surface layer • To account for the different factors in the walls, the above equation should be introduced as Where is the area of the surface enclosure and is the factor derived from the previous slide

  8. Maximum temperature limit • The maximum temperature in the heating phase occurs when at which point with Where………

  9. Maximum temperature limit • is the design value of the fire load density related to the area of the enclosure • is described later….. Surface area of the floor Design value of fire load density related to surface area of the floor – from Annex E Total surface area of compartment

  10. Maximum temperature limit • When the in the main equation is replaced by with where is 25min for slow fire growth, 20min for medium fire growth and 15min for fast fire growth. This is expanded upon in Annex E

  11. Further numerical limit • A further limit is imposed on the operation under the following criteria: If > 0.04 Then must be multiplied by a factor given below…. and < 75 and < 1160

  12. Curves in the cooling phase • For Where For For

  13. Curves in the cooling phase • For Where For For

  14. Curves in the cooling phase • For Where For For

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