Steel Reinforced Concrete Pile Design

[JSco25]

Hello,

So I am designing a steel reinforced concrete pile which will not work in the usual sense of having a vertical load applied, but to stabilise a slope, therefore subjected to lateral loading due to the failed slope circle.
My question however lies with the structural design of the pile and steel reinforcing.
I would like to know how to compute the Modulus of Elasticity (Youngs Modulus) of the pile. This will allow me to complete analysis on the section through an FEA program, which one of the input parameters for the material is its Youngs Modulus.
If anyone can offer guidance that would be great.

Thank you,

 

[hokie66]

Why would you need a FEA program to design what will be essentially a reinforced concrete beam? Concrete does not have a clearly defined E like steel, and then after it cracks, the modulus changes. Just use standard reinforced concrete theory for the design, after you analyze the bending moments and shears on the beam.

 

[BUGGAR]

My age is showing but we used to do this in working stress design and never considered deflection. In lieu of deflection calcs, we kept the span to depth ratio low.
As the geotech, I would ask how much deflection do you need to mobilize the active state of the soils?
I still have my Basic program for slope stability circles and resulting F.S., but it doesn't take deflections into account. Luckily, all my projects are still at the tops of their slopes.

 

[BigH]

OP - you might like to look at the link below - I have not read it to use it - but they do mention FEA.

http://www.journalagent.com/pajes/pdfs/PAJES_15_2_194_202.pdf

 

[BUGGAR]

Thank you BigH, that was a good article. It's good to see they use the same methods we used but now with FEA. I guess I could use soil pressures from the least stable circular failure and apply those to a soil-spring supported pile, but somehow this seems too far removed from real earth. On the projects I worked on, we used grade beams between piles so we didn't have to consider soil arching between the piles.
ps: In my last post I said active and meant passive .