Concrete Foundation Wall/Shear Wall?

[cuels]

I have been working on a foundation wall, and it has sparked some thought. I was designing a simple foundation for some equipment. The walls are continuous around the edge of the supporting slab. When designing the wall, there are the vertical gravity loads, self-weight, and lateral loads (in-plane) from wind/seismic.

My question is in the flexural steel in the shear wall. If the wall is a single wall, then there is a large amount of steel required on the ends of the wall. I am calculating this by hand, so I am wondering what the standard for design is in this case if I have a continuous wall that extends around each end of the wall. Is this the correct way to model the wall, and if so, how do I reduce the amount of steel required in the end of the wall (i.e. residential foundation only requires a single bar in corners and typical spacing otherwise)?

If not, what is the correct way to model a continuous foundation wall? Should I only be looking at the horiz/vert required steel for shear?

 

[ishvaaag]

You can count with connectivity at corners if there's such. If the length of the wall is of akin magnitude to the basement depth (assumed to be the height of the wall) you will have significant reduction of the amout of flexural rebar.

And the same applies to a slab rigidly connected to the walls, will act as a support the walls; all these effects are properly captured by a complete 3D model upon which the hypotheses are properly laid out.

 

[cuels]

I don't have the benefit of 3D modeling (FEM), so what is the best simplified method of modeling the connecting walls, or is there another method of modeling a foundation similar to this one?

I am looking at a 12'x40' pad for equipment that has a 5' deep continous wall around the exterior of the pad to support the equipment skid. The contractor wants to pour the pad and wall in a monolithic pour. So, I will have a thick wall to get my soil bearing area. I am trying to justify my requirement for horizontal and vertical reinforcement. I am almost certain that it will just be Asmin. However, I would like to have a complete set of calculations for this project.