Post embedment
Post embedment
(OP)
I have a question on post embedment in a concrete drilled shaft/caisson.
I am doing a soundwall design where the soundwall posts are prestressed concrete in the shape of an "I". The panels are also prestressed concrete.
We are trying to calculate how far to embed the soundwall posts into the drilled shaft/caisson foundations. The foundations are 42" in diameter. To me, as the post bends, it will try to split the caisson in half somewhat along the axis of the wall. The reinforcing hoops that we put in the caisson will try to prevent that splitting.
I feel like I have a handle on the mechanism of failure, but am having a hard time putting numbers to the length of embedment required or the size and spacing of the steel hoops required. Right now we have 4' embedment length, which seems reasonable.
Any thoughts? Has anyone else tackled this problem?
I am doing a soundwall design where the soundwall posts are prestressed concrete in the shape of an "I". The panels are also prestressed concrete.
We are trying to calculate how far to embed the soundwall posts into the drilled shaft/caisson foundations. The foundations are 42" in diameter. To me, as the post bends, it will try to split the caisson in half somewhat along the axis of the wall. The reinforcing hoops that we put in the caisson will try to prevent that splitting.
I feel like I have a handle on the mechanism of failure, but am having a hard time putting numbers to the length of embedment required or the size and spacing of the steel hoops required. Right now we have 4' embedment length, which seems reasonable.
Any thoughts? Has anyone else tackled this problem?






RE: Post embedment
It may be overly conservative to design the hoops to resist the full compression of the post on the shaft because the resistance to the compression comes from the earth and transverse shear in the shaft.
RE: Post embedment
RE: Post embedment
5300 = (.85 * .7 * 3 ksi * 16" * a) * (48" - a/2 - a/2)
a=4.24" so my embedment is OK. Is this what the two of you were trying to convey?
RE: Post embedment
Here are a few standard details from Ohio DOT that show the hoop details in pile supported footings and pier caps. I think you’re a bridgie, broekie, so this should be right up your alley.
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Here’s an actual detail I used on an integral abutment bridge with a 2’-6” pile embedment. I used #4’s @ 12” in this design.
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RE: Post embedment
You also need to sum the forces in the direction of the moment and add the pressure resisting that to the embedment.
RE: Post embedment
RE: Post embedment
RE: Post embedment
RE: Post embedment