Dad2one
Structural
- Jul 2, 2009
- 15
Hello,
I've been asked to evaluate whether a 6 foot wide by 24" deep continuous footing under a wall can be strengthened with mini/pin piles drilled through the footing on each side of the walls 15" away from the face. Piles are 2-by-2 along the wall spaced 5 feet apart, plus/minus depending on the circumstance. Construction is tunnel forming and the walls are 7" thick. I can get all the shears and bending to work but my question is about rebar anchorage. Given the strut and tie nature of caps, the rebar should be anchored at the pile center line rather than at the face of wall. Existing bars are #6 (no hooks) and the max development length I have is 14.5 inches vs a 20 inch Ld required (based on (Cb+Ktr)/db >= 2.5). Rebar is needed for strength so can't reduce by required/provided.
I know this strengthening is done all the time...how is this issue resolved?
Thanks.
I've been asked to evaluate whether a 6 foot wide by 24" deep continuous footing under a wall can be strengthened with mini/pin piles drilled through the footing on each side of the walls 15" away from the face. Piles are 2-by-2 along the wall spaced 5 feet apart, plus/minus depending on the circumstance. Construction is tunnel forming and the walls are 7" thick. I can get all the shears and bending to work but my question is about rebar anchorage. Given the strut and tie nature of caps, the rebar should be anchored at the pile center line rather than at the face of wall. Existing bars are #6 (no hooks) and the max development length I have is 14.5 inches vs a 20 inch Ld required (based on (Cb+Ktr)/db >= 2.5). Rebar is needed for strength so can't reduce by required/provided.
I know this strengthening is done all the time...how is this issue resolved?
Thanks.
