Top continuous bar in two-way slab?
Top continuous bar in two-way slab?
(OP)
I wonder practically if some percentage of top bars should be continuous through the entire span in two-way slab design. Thanks a lot!
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Top continuous bar in two-way slab?
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Top continuous bar in two-way slab?Top continuous bar in two-way slab?(OP)
I wonder practically if some percentage of top bars should be continuous through the entire span in two-way slab design. Thanks a lot!
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RE: Top continuous bar in two-way slab?
Sometimes loading in adjacent spans may cause negative bending which would necessitate top bars. Also, if the slab thickness is large enough, you may want a top layer to prevent shrinkage cracking.
RE: Top continuous bar in two-way slab?
RE: Top continuous bar in two-way slab?
RE: Top continuous bar in two-way slab?
Instead, they use the bottom bars and require a portion of them to be continuous. If a column failure occurs, or other type of failure, whether the continuous bars are in the top or bottom isn't all that critical when you are simply trying to avoid a collapse progression like what happened in Oklahoma City some years ago.
The bottom bars are spliced over the support so there is some concept that the additional concrete above the bars at the support helps to pin the bars in place and allow for a cantenary type behavior after collapse.
RE: Top continuous bar in two-way slab?
Do not be afraid of using more rebar than required ... unless constructability will be affected greatly. If you do use continuous, be ready for a call from the contractor however - they may have some opinions on the constructability that would govern wheather or not you design them as continuous again.