Answer:
The modulus of elasticity of the material is reduced for the design according to EC 3, but not for the internal forces, since this is not intended according to the method of DIN EN 1993‑1‑2. The cold state of the structure is always assumed. When calculating the internal forces, you only need to consider internal restraint from temperature loads, if this exists.
Question
For the fire resistance design, the modulus of elasticity is reduced. I assume that this applies to the design first. However, to what extent is a stiffness change in the structural system and thus a load redistribution considered?
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