Pile group lateral resistance
Pile group lateral resistance
(OP)
Hi
Can anyone teach me how to find out the maximum moment at plastic hinge of the pile in pile group.
My case is, my abutment has 2 rows of pile spacing 1000mm, all piles size 400mm x 400mm. there are 4 piles each row(spacing 3m, 2.4m, 3m). The abutment beam is 1.9m wide x 1m depth. The abutment is resisting 1296kN braking load. say 2.5 pile passive coefficient, and 3.5 abutment beam passive coefficient.
So my question is, how can I calculate the maximum moment at plastic hinge. (I know the front row piles will resist more lateral loading, so I assume the max. moment happen at front load pile, right?). I know how to calculate the moment if only one row of pile, but don't know how to do it for two rows. Can anyone teach me.
Thanks.
Marco
Can anyone teach me how to find out the maximum moment at plastic hinge of the pile in pile group.
My case is, my abutment has 2 rows of pile spacing 1000mm, all piles size 400mm x 400mm. there are 4 piles each row(spacing 3m, 2.4m, 3m). The abutment beam is 1.9m wide x 1m depth. The abutment is resisting 1296kN braking load. say 2.5 pile passive coefficient, and 3.5 abutment beam passive coefficient.
So my question is, how can I calculate the maximum moment at plastic hinge. (I know the front row piles will resist more lateral loading, so I assume the max. moment happen at front load pile, right?). I know how to calculate the moment if only one row of pile, but don't know how to do it for two rows. Can anyone teach me.
Thanks.
Marco





RE: Pile group lateral resistance
RE: Pile group lateral resistance
RE: Pile group lateral resistance
RE: Pile group lateral resistance
I am not very understand what you are talking about, in my understand, two row of pile:
I I <--- lateral force
I I
I I
\ \
\ \ <--I want the moment at this point
I I
I I
I I
Thanks.
RE: Pile group lateral resistance
Castigliano
RE: Pile group lateral resistance
The first thing I want to know is, how much soil resistance behind 1st row of pile, and how much behind 2nd row.
I read some papers, "pile spacing effects on lateral pile group behavior", I understand that the 1st row of pile resist more loads than rest, but I don't know how to calculate. I know the AASHTO suggest 3D spacing, but my case is less than that. Once I know how much lateral force go into first row of pile, I can find out the Mp at where zero shear.
But from another hand, I also agree with civilperson "If piles are connected with pile cap, all piles will move the same and experience the same lateral pressure from the soil".
So now, I am a little confuse. Can anyone explain more.
Thanks.
RE: Pile group lateral resistance
RE: Pile group lateral resistance
Dan
RE: Pile group lateral resistance
Think of it as driving a stake in the ground and then pushing on the exposed stake. The stake will deflect and push the soil out of the way near the surface, but there will be a point that the stake no longer deflects. This is the point of fixity and maximum moment location.