H Pile Capacity Determined from Driving Data
H Pile Capacity Determined from Driving Data
(OP)
I am trying to calculate what the maximum allowable vertical load per pile is for some 10x42 H-piles that were driven 57 ft yesterday for a small rural bridge abutment. Reference is being made to the ENR equations (from Lindeburg's CERM) for a MKT model 7 double-acting air hammer. I have the specs for the hammer, but am unsure what figures to use for the driven weight vs. striking weight. There are two pile capacity equations: one for driven weight < striking weight and another for driven weight > striking weight. Driven weight = weight of hammer + pile(?), Striking weight = rated energy per blow in ft-lbs(?). Any help is appreciated. Thanks





RE: H Pile Capacity Determined from Driving Data
One way to know for sure is to test it, per the ASTM standards. They have a quick compression test and your local geotech can provide the info if not the entire procedure.
I've not known anyone to back into the value from hammer energy before. But then most everything I've done with pile has been driven to rock upwards of 120'+ below grade.
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
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RE: H Pile Capacity Determined from Driving Data
Now, before anyone gets on the anti-dynamic driving formula bandwagon or soapbox, remember that these formulas have been used for about a hundred years and I haven't noticed all of the old buildings falling over. Are the formulas accurate and exact? No. Are some formulas better than others? Probably. Are there more exact ways of determining or proving the pile capacity? Yes. But these formulas have been and are commonly used, especially for small jobs nowadays.
For bridge abutment piles, the bridge owner or designer may want you to use some other method such as dynamic PDA testing, WEAP analysis, static load test, etc. Check the project specs.
Also, the ASTM D-1143 Quick Static Pile Load test has been revised recently and is not a quick as it used to be.
www.PeirceEngineering.com
RE: H Pile Capacity Determined from Driving Data
RE: H Pile Capacity Determined from Driving Data
www.PeirceEngineering.com
RE: H Pile Capacity Determined from Driving Data
RE: H Pile Capacity Determined from Driving Data
PAUL S SNYDER, P.E.
RE: H Pile Capacity Determined from Driving Data
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One other option is to use a wave equation analysis to "back figure" the capacity. That's fallen out of fashion with CAPWAP, but it's an option if you have the familiarity with the method to do it.
http://www.pz27.net
RE: H Pile Capacity Determined from Driving Data
RE: H Pile Capacity Determined from Driving Data
http://www.vulcanhammer.info/drivability/tti/
I am in the process of posting a lot of "classic" material on driven piles and especially offshore technology, so check back from time to time.
http://www.pz27.net
RE: H Pile Capacity Determined from Driving Data