Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Joints for slab on Pile Caps

Status
Not open for further replies.

DMJ-20

Structural
Joined
Feb 24, 2020
Messages
2
Location
NG
Hello everyone

My first-time post and new to this forum.
I am designing a suspended reinforced concrete workshop ground floor slab, 75 x 60 m (already in panels) spanning on beams then between pile caps. The slab will bear the weight of a reach stacker and it is clear from the soil test report it cannot sit on grade. For this kind of design do I need to bother about introducing either expansion or construction joints? If yes, what is the best way to go about it? The slab has a thickness of 400 mm and reinforced both ways i.e top/bottom.

Thanks
 
Whether you will need construction joints will depend on pour rate -- how much concrete you can get to site and how big your crews are.

If I recall, 60m is just about the point when it begins to make sense to include an expansion joint, although it would need to be an expansion joint for the whole building, not just the slab. Would depend somewhat on your climate and site.

Suspended slabs typically aren't as critical for shrinkage joints, because of the higher reinforcement ratio needed to suspend the thing and less restraint. Although your situation sounds like it will have stiffer restraint than normal.

----
just call me Lo.
 
I have always been of the opinion that there is no need to introduce movement joints in a slab that is supported by piles. The piles will restrain any movement anyway.
 
Agree with Retrograde. Provide reinforcement for bending capacity, and for shrinkage crack control, but movement joints will just complicate things unnecessarily.
 
Thank you all for your contributions. I do understand the points made. I share the same view as yours and just wanted to lay any doubts to rest.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top