Pile Cap Reinforcing
Pile Cap Reinforcing
(OP)
http://www.universityclubtower.com/progress/photo_gallery/2005_2.cfm
In the above link, scroll down to the reinforcing detail for the pile cap. It consists of an "X" shaped reinforcing band over piles. I must admit, I haven't see such a detail before. It makes sense in a way that the piles have highest loading when the tower crane is usually at 45 degrees.
Is there an advantage to reinforcing it this way compared to the traditional orthogonal layout?
In the above link, scroll down to the reinforcing detail for the pile cap. It consists of an "X" shaped reinforcing band over piles. I must admit, I haven't see such a detail before. It makes sense in a way that the piles have highest loading when the tower crane is usually at 45 degrees.
Is there an advantage to reinforcing it this way compared to the traditional orthogonal layout?
It’s no trick to get the answers when you have all the data. The trick is to get the answers when you only have half the data and half that is wrong and you don’t know which half - LORD KELVIN






RE: Pile Cap Reinforcing
RE: Pile Cap Reinforcing
Most likely for my problem, the preference of those using the radial schemes was caused to ensure significant steel was under the applied load, then making less likely a punching failure. However strut and tie systems are also viable with the belts following the perimeter piles. Most surely those using the radial reinforcement schemes disliked the reinforcement laid in such way since some pyramidal chunk of concrete could be ejected even with a satisfactory strut and tie system at work if not enough complementary reinforcement was placed in the pile cap.
The situation in your photo may follow the same kind of reasoning and as you seem to think, lead to the better strength and stability when the pile (or even soil when no pile cap) response has to concentrate towards some tip of the pile cap.
RE: Pile Cap Reinforcing
By the way, does that link work for you guys? I had to copy and paste it into the browser. Links don't work for me in the body of the posts, but nobody else seems to be complaining.
RE: Pile Cap Reinforcing
These photos are showing only small pads as temporary support:
http://www.universityclubtower.com/progress/photo_gallery/2005_1.cfm
RE: Pile Cap Reinforcing
RE: Pile Cap Reinforcing
http://www.universityclubtower.com/progress/photo_gallery/2005_3.cfm
It’s no trick to get the answers when you have all the data. The trick is to get the answers when you only have half the data and half that is wrong and you don’t know which half - LORD KELVIN
RE: Pile Cap Reinforcing
RE: Pile Cap Reinforcing
I like the 45 degree pattern. With a fully loaded pile, you'd expect to get crack perpendicular to the reinf. If two piles are loaded, you get two cages activated at a smaller moment arm.
RE: Pile Cap Reinforcing
If you think it is a pile cap, the you should have hooked bars at the end, beyond the pile. You always have hooked bars in pile caps.
It’s no trick to get the answers when you have all the data. The trick is to get the answers when you only have half the data and half that is wrong and you don’t know which half - LORD KELVIN
RE: Pile Cap Reinforcing
What would you be doing, if you knew that you could not fail? Ans. Bonds and derivative brokering.
RE: Pile Cap Reinforcing
Thats my point. Its a pile cap not a mat (should have used spread footing term I guess).
RE: Pile Cap Reinforcing
I'll normally take a standard orthangonal cage to hit a minimum level of shrinkage steel, though, and overlay the necessary diagonal bars on top. It's not normally too many.
RE: Pile Cap Reinforcing
What would you be doing, if you knew that you could not fail? Ans. Bonds and derivative brokering.
RE: Pile Cap Reinforcing
also, i've always put the pile cap reinf in an orthagonal pattern with additional bars at the pedastals. The only reason I see to detail the rebar in this manner is if there were only 4 large diameter caissons as the deep foundations.
RE: Pile Cap Reinforcing