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elevated deck slab contraction joint

elevated deck slab contraction joint

elevated deck slab contraction joint

(OP)
been reading conflicting things online with regards to elevated deck slab. should i or should i not put CJ for reinforced elevated deck slab.

also please comment on my cj location, if cj is preferable.

thanks,

RE: elevated deck slab contraction joint

I never use them on elevated slabs.  Never.

RE: elevated deck slab contraction joint

This question has come up on more than a few occasions. I suggest you search this Forum to find your answer.

RE: elevated deck slab contraction joint

I'm with JAE, you do not put contraction joints in elevated slabs.  If you put them in you need to check the slab for the bending/shear at the reduced section depth.

RE: elevated deck slab contraction joint

Don't do it, just don't do it.

ANY FOOL CAN DESIGN A STRUCTURE. IT TAKES AN ENGINEER TO DESIGN A CONNECTION."
 

RE: elevated deck slab contraction joint

I agree that there should be no contraction joint in a suspended slab.

BA

RE: elevated deck slab contraction joint

In the picture shown, there certainly should be not contraction joints.  But I think is is an overgeneralization to say never.  What a lot of people call expansion joints are really for contraction.

RE: elevated deck slab contraction joint

If you have a one way elevated slab, would there be any issues with contraction joints parallel to the slab span?  Seems like it would be beneficial if the slab has an exposed finish?

RE: elevated deck slab contraction joint

A joint parallel to the span could be considered, but you might want to explain further how this is beneficial to the finish.  You have to assess what effect a joint has on the overall structural stability of the building.

RE: elevated deck slab contraction joint

The joint would minimize random shrinkage cracking in the slab, maintaining a cleaner appearance.  The ones we have specified would allow horizontal movement but not vertical.  And yes that's a good point, the use of the diaphragm would have to work around the joints.    

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