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Originally Posted by 1487
This is very interesting. Not many office/residential buildings exist in Philly so the way this will be built is going to be unique since its almost like two separate buildings stacked vertically. What are the exact reasons for using steel for office but concrete for residential towers?
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with concrete flat plate construction, it is economical to build with low floor to floor heights, as in residential construction (aound 11-12 feet fl-fl.). steel is better for higher floor to floor heights, which you would have in office buildings (14-16 feet or more.) flat plate allows you to build with lower floor to floor heights because the structural members can be shallower, so less room is needed between floors. Since steel requires deeper beams, more room is needed for them between floors. You might as well use them where you need higher floor heights, and since steel frames are constructed pretty quickly, it is economical for that purpose.