rebar connection between existing and new concrete slab
rebar connection between existing and new concrete slab
(OP)
Hi, Id like to know how do you guys suggest to connect existing concrte slab (14 cm thick) with new slab (same thickness).
I was thinkin about connecting it with rebar (in the middle of the thickness of existing slab).
Im wondering about modeling supports for a new slab at the edge of the slab which is beside existing slab (building). Is it alright, to use pinned support and then choose rebars (diameter and spacing) based on support reaction there (shear forces)?
How do you guys do it?

I was thinkin about connecting it with rebar (in the middle of the thickness of existing slab).
Im wondering about modeling supports for a new slab at the edge of the slab which is beside existing slab (building). Is it alright, to use pinned support and then choose rebars (diameter and spacing) based on support reaction there (shear forces)?
How do you guys do it?







RE: rebar connection between existing and new concrete slab
RE: rebar connection between existing and new concrete slab
1) Chip a continuous bearing key into the bottom of the existing slab. This will increase reliability and encourage the entire slab to participate in resisting shear.
2) move the dowels to the top of the slab where they will be most advantageous for shear friction and crack control.
Technically, to achieve proper anchorage of your bottom steel (assuming pin connection), you either need to create a bearing ledge or you need to lap the bottom steel with properly anchored dowels.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: rebar connection between existing and new concrete slab
'Chip a continuous bearing key'
Can you please post a sketch/picture of this... if you can find one of course...
Sorry but English is not my 1st language so i have some trouble understanding some of expressions.
RE: rebar connection between existing and new concrete slab
and what I interpret Kookt meant is option 2,he can confirm this
or pull my drawing apart! :)
RE: rebar connection between existing and new concrete slab
RE: rebar connection between existing and new concrete slab
DaveAtkins
RE: rebar connection between existing and new concrete slab