Construction joint position in suspended flat slab
Construction joint position in suspended flat slab
(OP)
thread507-276229: Location of construction joints on flat slab!
With reference to thread507-276229: Location of construction joints on flat slab! , why can a CJ not be placed at midspan? Surely that is where the bottom part of the concrete will form a crack anyway? Top part will just push together? Anybody feel like a debate?
With reference to thread507-276229: Location of construction joints on flat slab! , why can a CJ not be placed at midspan? Surely that is where the bottom part of the concrete will form a crack anyway? Top part will just push together? Anybody feel like a debate?






RE: Construction joint position in suspended flat slab
RE: Construction joint position in suspended flat slab
RE: Construction joint position in suspended flat slab
Bottom reinforcement normally is continuous through construction joints in slabs. There is rarely a reason to splice bars at construction joints. You put joints at or near midspan because the shear is minimal there.
RE: Construction joint position in suspended flat slab
RE: Construction joint position in suspended flat slab
RE: Construction joint position in suspended flat slab
RE: Construction joint position in suspended flat slab
The fabricators many times do not know the sequence or staging of concrete placements and simply fabricate the rebar based on the design layout.
By staying in the middle 1/3 you minimize the cases where the CJ's will intersect top bars extending past the joint location.
RE: Construction joint position in suspended flat slab
JAE has described it correctly. The formwork and reinforcement are all in place, and the construction joint is just to limit the amount of concrete that has to be placed and finished at one time.
RE: Construction joint position in suspended flat slab
RE: Construction joint position in suspended flat slab