Diagonal Reinforcement around opening in Pile Mat
Diagonal Reinforcement around opening in Pile Mat
(OP)
Hi,
I have a Pile Mat of 10 meter x 15 meter supported on Pile. It has a opening of 5M x 3M as shown in the picture attached.
Can any body explain me how to provide the diagonal reinforcement around the opening, and why it is provided.
I have a Pile Mat of 10 meter x 15 meter supported on Pile. It has a opening of 5M x 3M as shown in the picture attached.
Can any body explain me how to provide the diagonal reinforcement around the opening, and why it is provided.






RE: Diagonal Reinforcement around opening in Pile Mat
Dik
RE: Diagonal Reinforcement around opening in Pile Mat
In the event you expect flexural/tensile stress on the mat, then you would want to analyze the loads closer and make sure you have full load transfer, comparable to a wood header which supports joists at an opening, and then the header frames into a larger joist/beam that spans the full length.
RE: Diagonal Reinforcement around opening in Pile Mat
"In the event you expect flexural/tensile stress on the mat, then you would want to analyze the loads closer and make sure you have full load transfer,"
Even for flexural/shear design, I would not normally use diagonal bars at re-entrant corners... cheaper if you don't and minimises congestion.
Dik
RE: Diagonal Reinforcement around opening in Pile Mat
RE: Diagonal Reinforcement around opening in Pile Mat
RE: Diagonal Reinforcement around opening in Pile Mat
Dik
RE: Diagonal Reinforcement around opening in Pile Mat
RE: Diagonal Reinforcement around opening in Pile Mat
2) Like other trim bars, we're usually attempting to develop them on both sides of the presumed crack that we're trying to keep closed.
3) If there's a way to calculate the quantity needed, I don't know it. I use 2-#4 top and bottom for slabs around 8" thick and scale up and down from there.
4) Don't forget about your re-entrant corners as well.
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: Diagonal Reinforcement around opening in Pile Mat
With slabs on grade, diagonal bars at reentrant corners serve a purpose in controlling the stress riser type cracks there. Get the bars as close as cover conditions allow.
RE: Diagonal Reinforcement around opening in Pile Mat
However I still have some clarification.
(1) Can the slab can crack as shown in the figure attached below, and if it cracks what is the solution or remedy to avoid it.
(2) For this Pile Mat of 15 meter x 10 meter, do I need to provide expansion joint. Please ex pain me in detail regarding the expansion joint for a Pile Mat.
RE: Diagonal Reinforcement around opening in Pile Mat
Dik
RE: Diagonal Reinforcement around opening in Pile Mat
RE: Diagonal Reinforcement around opening in Pile Mat
RE: Diagonal Reinforcement around opening in Pile Mat
Dik
RE: Diagonal Reinforcement around opening in Pile Mat
However there is no restraint in the re-entrant corners for expansion and contraction(as mentioned earlier by Dik).
Since, there is restraint for the interior corners (where diagonal bars are shownby KootK)the cracks are formed.
Please correct me if I am wrong.
RE: Diagonal Reinforcement around opening in Pile Mat
Dik
RE: Diagonal Reinforcement around opening in Pile Mat