do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
(OP)
I have a slab on grade that is 70' long and will need rebar splice.
I rebar top and bottom.
I do put stagger on splice rebar location on plan view but should I stagger also top and bottom rebar?
if I have to stagger only one, which is better to stagger on plan or on elevation?
I rebar top and bottom.
I do put stagger on splice rebar location on plan view but should I stagger also top and bottom rebar?
if I have to stagger only one, which is better to stagger on plan or on elevation?






RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
As for picking one stagger over the other, I guess that I'd vote for keeping the staggers shown in plan. For shrinkage cracking, the top layer is most critical. For any flexural stresses, you'd only be working one layer of bars at a time anyhow.
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: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
About the only issue I might have with stacking them in one location is this obviously piles up twice as much rebar in one location. If my thickness or bar center-to-center spacing is small, then I might get a slight congestion issue at the location of all the lap splices.
Regarding cracking I'm actually wondering if doubling up the splices might not be beneficial. While you might not have the best tensile capacity you have twice as many dowels crossing the crack as the areas without lap splices. Seems like that would count for something.
Otherwise, as KootK pointed out, it shouldn't make any difference structurally whether you stagger then or not as you're highly unlikely to have both taking tension in a slab (or beam).
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
www.americanconcrete.com
RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
Edit: Sorry, didn't mean to imply that you can stagger splices and forget about sawcutting at the right time.
Dik
RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
The complete document, "CRSI Engineering Technical Note ETN-D-2-13, Staggered Lap Splices" is attached.
Suggest avoiding the proposed splice detail circled in red on the marked up illustration shown below.
1. Rebar placement does not require that level of precision.
2. Fabrication of that detail is an unnecessary expense.
3. In the field, the proposed rebar has to be turned one way for the splice pattern to work. Straight bars work in either direction.
4. If any field changes in rebar length are required (it happens), shortening (cutting) has to be done on the correct end. If longer bars are required... what do you do? Have more bars with the special end detail delivered? With straight bars, field changes are easy (may have to add an extra splice location, or two... not a big deal).
www.SlideRuleEra.net
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RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
Dik
RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
www.americanconcrete.com
RE: do i need to stagger both on plan and elevation rebar splice for a long slab on grade?
Dik