EZBuilding
Structural
I am working on a building which must utilize batter piles to resist lateral loading as the upper soil strata are too weak to provide meaningful lateral resistance. I have found limited information regarding battered piles, especially worked out examples from a structural engineering perspective. Accordingly, the below and attached are my attempts at resolving lateral loads into a battered pile foundation system.
I believe there are two "methods" in which batter piles resist lateral loads, either through passive or active resistance (self described nomenclature here). Through passive resistance the batter piles resist lateral loads based on the horizontal component of the axial load in the batter pile. Through active resistance, the lateral load increases the axial load in the batter pile.
The attached worked out example attempts to work through the reactions on each of these methods.
Assumptions:
Reinforced concrete shear wall supported on pile cap with piles.
1 to 6 horizontal to vertical batter
0.6 D + 0.6W is the controlling load combination and the only one considered.
No seismic loading
No lateral resistance provide by pile bending or lateral earth pressure
Pile loads based on axial and moment demands are provided based on rigid pile group analysis
Generally, I am looking for feedback on my understanding of how to resolve lateral loads in a battered pile foundation. Specifically in the "active resistance case" as I appear unable to close the loop on the pile reactions. If anyone believes I am missing something in my worked out examples, please do share and I will aim incorporate the comments into this understanding.
I believe there are two "methods" in which batter piles resist lateral loads, either through passive or active resistance (self described nomenclature here). Through passive resistance the batter piles resist lateral loads based on the horizontal component of the axial load in the batter pile. Through active resistance, the lateral load increases the axial load in the batter pile.
The attached worked out example attempts to work through the reactions on each of these methods.
Assumptions:
Reinforced concrete shear wall supported on pile cap with piles.
1 to 6 horizontal to vertical batter
0.6 D + 0.6W is the controlling load combination and the only one considered.
No seismic loading
No lateral resistance provide by pile bending or lateral earth pressure
Pile loads based on axial and moment demands are provided based on rigid pile group analysis
Generally, I am looking for feedback on my understanding of how to resolve lateral loads in a battered pile foundation. Specifically in the "active resistance case" as I appear unable to close the loop on the pile reactions. If anyone believes I am missing something in my worked out examples, please do share and I will aim incorporate the comments into this understanding.