Seismic Design of Cantilevered Soldier Pile Walls
Seismic Design of Cantilevered Soldier Pile Walls
(OP)
Does anyone have a reference for how to design cantilever (i.e. not anchored) soldier pile walls for seismic loading. I am using the Mononobe-Okabe Method as specified in the 17th Edition of AASHTO.
Thanks.
Thanks.





RE: Seismic Design of Cantilevered Soldier Pile Walls
You could either use the inverted triangle as a distributed load and add it to your earth pressure or use it as a line load (get the area) and apply it at 0.6H above the subgrade level.
They are directly from the lateral Stress Conference Paper of 1971 by Seed and Whitman.
RE: Seismic Design of Cantilevered Soldier Pile Walls
Current design agrees that you need to also include the horizontal seismic inertia of the wall itself and any soil wedge considered behind the wall. The weights of both should be multiplied by the peak ground acceleration, or Kh (1/2 the peak ground acceleration). Other than that and you can use lower factors of safety, its basically the same steps after that point as conventional wall design (determine all your forces, moments, design the sections)
RE: Seismic Design of Cantilevered Soldier Pile Walls
If it is permanent, you have to decide wether to design the wall for 10% in 50 yr event or a 2% in 50 yr event. Also, you must decide wether you want the shoring wall to be life safe or if you want it to be operational (serviceability / deflection controlled).
Now, the other assumption you can use to reduce the seismic forces is to assume a certain plastic yield factor (structure or soil) to reduce your effective seismic forces.
Just a tickler for your thoughts.