1. The structural grid should be a hollow steel profile section filled with concrete. A construction made only out of steel was rejected due to the fire safety rules.
2. The structural grid is 10x10x5 meters.
3. The 22 staircases will function as the cores that secure the stability of the whole construction.
4. The roof can be made as a space truss. Possible dimensions 10x10x10 meters. It will be supported by at least two rows of columns in the perimeter.
The centre of the roof has to be open; it will be covered by retracting elements. Therefore we need reinforcement along the axis of movement and around the central hole of the roof.
how will steel filled inside with concrete serve fire requirements?
BeantwoordenVerwijderenUsually, this type of fire protection is applied to columns only. Filling hollow sections with concrete is a very simple and attractive way of enhancing fire resistance.
BeantwoordenVerwijderenThe temperature in the unprotected outer steel shell increases rapidly. However, as the steel shell gradually loses strength and stiffness, the load is transferred to
the concrete core. Apart from the structural function, the hollow section
also acts as a radiation shield to the concrete core. In combination with a steam layer between the steel and the concrete core, this leads to a lower temperature rise
in the core compared to reinforced concrete structures. Depending on the fire resistance requirements, the concrete in the hollow section can be plain concrete (fire resistance up to 60 min.) or concrete with rebars or steel fibres