Piling Settlement in the news
Piling Settlement in the news
(OP)
We have in our area a new Interstate Bridge that was commissioned in December 2007 and they have close off 2 lanes of the three available lanes on one span due to a little piling settlement. The settlement is reported as 1" which is stated as no problem and should be expected. According to fishermen the gap between the bridge deck and support looks larger than one inch.
Would one expect a 1" settlement of piling in 5 months?
I drove over the bridge on Wednesday and if the surveying was being done at night we would have a Laser light show on the bay. One has to be quite suspicious as the DOT isn't always forthcoming, don't want to frighten the public.
Would one expect a 1" settlement of piling in 5 months?
I drove over the bridge on Wednesday and if the surveying was being done at night we would have a Laser light show on the bay. One has to be quite suspicious as the DOT isn't always forthcoming, don't want to frighten the public.





RE: Piling Settlement in the news
RE: Piling Settlement in the news
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I know if one has that kind of settlement on a land building it would alsmost be panic time. We had one large building at work where there has been a 1/16" settlement in 50 years and even that caused several discussions.
RE: Piling Settlement in the news
RE: Piling Settlement in the news
RE: Piling Settlement in the news
RE: Piling Settlement in the news
The FDOT has has and will use the umbrella of national security not to release information.
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RE: Piling Settlement in the news
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RE: Piling Settlement in the news
Sorry I lost track of this thread. Piles develop tip resitance and side friction. At some point the pile develops sufficent capacity to carry dead loads. In order to develop this capacity, the pile must move downward relative to the soil. At some point, (Refered to as the neutral axis) the pile has sufficent capacity, and the soil above this point moves downward wrt the pile. This causes down drag. As additional loads are added to the pile, more of the the pile no moves downward and the down drag is replaced by positive friction.
Another misconception is that downdrag only occurs in soft soils. Actually it occurs in all soils, and only a small amount of settlement is needed to achive full friction. Thus soils that exhibit large settlements do not impose any more downdrag than if they had only settled slightly.
The concept is based on the work of Fellenius and is detailed in the Canadian Foundation Manual.
This concept is somewhat contrary to current practices by many designers working with AASHTO.
RE: Piling Settlement in the news