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concrete and steel buiding

concrete and steel buiding

concrete and steel buiding

(OP)
Is it possible to have 20 plus upper stories of concrete cnstruction transitioning to a platform of steel construction on the lower floors?  
 

RE: concrete and steel buiding

Anything is possible. What you are describing though screams soft story from a seismic standpoint.

Why would you/the client want to do this?

RE: concrete and steel buiding

I have seen it done many times the other way round. Concrete podium + steel superstructure.

Agree with larsacious, this is just too heavy a person on really light legs.

RE: concrete and steel buiding

This would work well on the other side of the earth though.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: concrete and steel buiding

(OP)
thanks guys - appreciate the confirmation of my gut.  Larsacious- why does a client ever want to do anything - $$$

RE: concrete and steel buiding

amyrice72,

I guess I am wondering under what circumstances it would be advantageous to construct a building in this manner. If you elaborate on the condition perhaps some more insight could be provided.

RE: concrete and steel buiding

If it is for speed of construction then you may want to consider making the lower columns composite as the structure rises thus potentially alleviating the soft storey concerns.

RE: concrete and steel buiding

One advantage in using steel for transfer floors is that the deflections due to the upper floors can be calculated to a higher degree of certainty.  On the other hand, staged prestressing of concrete floors can compensate for these deflections.

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