Disproportionate collapse 1

[Arrie]

I currently have to design a building for disproportionate collapse.

It is a five storey residential building with a basement parking and a mansard roof. Is it better to make use of a steel frame building rather than a concrete frame with transfer slabs. Which option will be the cheapest.

If a steel mesh frame is preffered, will the sound insulation be sufficient.

Thanks for the advice in advance

 

[MikeHydroPhys]

Much will depend on you foundation as to dead load from steel, or concrete mass emplacements and then concrete has standards to meet for shear and can be subject to solution as well as fire damage
so I would have thought with 5 stories you had best go to the dead load first and ensure the structure is integrally sound
see Lin and Stotesbury, Kevin McCloud on methods of making super story residential with terrible cellars into safe and attractive buildings that even Lawrence Llewellyn Bowen would be pleased to interiro decorate.
I think you can do wonder with pile foundation, cored, not ram, at suitable angles and thus relieve much of the stress load by avoiding platform, or raft footings and the inevitable cracks, by hanging the platform off the piles which form the building frame main set and then sling the rest, but be careful of floor units to ensure they cannot drop out of the frame if a sever stress forces the frame out of line, which should not happen, but then some people drop silly things on high buildings ruining the reputations of architects, structural engineers, fire officers and the future of peace as we knew it. Fire is the worst for a structural frame engineer.
Mike Stagg
MikeHydroPhys

mdshydroplane