The "long story" of fire design for steel structures within the Eurocode framework is a journey from simple, "one-size-fits-all" fire tests to sophisticated engineering that mimics real-world physics.

: How the loads (furniture, people, snow) change when the building is burning.

: These account for the size of the windows, the wall material, and how much fuel (desks, paper) is actually in the room.

Simple time-temperature curves like the or Hydrocarbon curve .

They are easy to use but often unrealistic because they never cool down. :