Unequal pile lengths
Unequal pile lengths
(OP)
Hi,
Does anyone know of any hand calculation reference or computer program which can analyse pile groups whose piles are different lengths.
We erect many buildings on sloping ground or rockhead and I need to investigate the loads in the piles quickley (and simply).
Thanks
newbuilder
Does anyone know of any hand calculation reference or computer program which can analyse pile groups whose piles are different lengths.
We erect many buildings on sloping ground or rockhead and I need to investigate the loads in the piles quickley (and simply).
Thanks
newbuilder






RE: Unequal pile lengths
If you're looking for the capacity of friction pile based on driven length, which would be variable. That value is a function of the soil properties and would vary from site to site. The geotech on the job should be able to help you out and they have already determined this information in order to find the terminal depth for the friction pile.
I hope this helps, if not, please elaborate on what you need.
RE: Unequal pile lengths
RE: Unequal pile lengths
Thanx
RE: Unequal pile lengths
RE: Unequal pile lengths
RE: Unequal pile lengths
for offshore platforms can analyse a set of piles with individually
different sizes, lengths, for any combination of loads (Axial, lateral,
torsional, all simultaneously). Some of the packages are:
1. SACS of Engineering Dynamics Inc., Kenner, La
2. StruCAD-3D of Zentech. Inc, Houston, Tx.
3. Splice
4. Splinter
The last two are used in Europe. One is part of SESAM package of DNV.
This is a typical problem in Offshore structural design.
Incidentally, Qshake's statement of P/A + My/I would be valid only if you
have a rigid pile cap. Pilecap flexibility can significantly affect the load
distribution in a pile group. This effect is probably more important
than length effect! Also for piles on slope, lateral load carrying capacity
(shear distribution in piles) may also be important since the fixity lengths
wpuld be different.
RE: Unequal pile lengths
RE: Unequal pile lengths
RE: Unequal pile lengths
This was actually for a spriral bridge built on 30 degree fill slope overlying the rock. I did have some mathematical equations which some whizz had given me on an earlier job unfortunately I never took time to learn their derivation and i did not have the confidence to use them.
Since the strucutre was a bridge it had umteen load conditions and in the end we just used the computer to analyse the actual pile lengths.
I just wanted to see if the problem had been encountered by others and if there was a quick method to overcome the analysis.
Incidently the bridge is built and looks great!
NB