Hillside Design
Hillside Design
(OP)
This is a tough situation and I hope your experienced engineers can give me a hand.
It is 3 story house on hillside (V:H>1:3) in Los Angeles. How can Hillside design requirements section 1666 be waived? I have never done hillside house design. Can we do following (please refer to attached section)?
Build a tall retaining wall with concrete mat foundation around the entire house. Floor joist will be attached to retaining wall; the entire house will be sitting on mat foundation. My understanding is the house is on a level pad and Hillside requirements shall be waived. Is that true???
If that can not work, how about if we leave 2ft gap between house and retaining wall, hillside requirement will be definitely waived, correct?
Any advice will be highly appreciated.
It is 3 story house on hillside (V:H>1:3) in Los Angeles. How can Hillside design requirements section 1666 be waived? I have never done hillside house design. Can we do following (please refer to attached section)?
Build a tall retaining wall with concrete mat foundation around the entire house. Floor joist will be attached to retaining wall; the entire house will be sitting on mat foundation. My understanding is the house is on a level pad and Hillside requirements shall be waived. Is that true???
If that can not work, how about if we leave 2ft gap between house and retaining wall, hillside requirement will be definitely waived, correct?
Any advice will be highly appreciated.






RE: Hillside Design
Think of a semi circular failure surface under the house and surrounding soil. I have actually seen the results of this type of failure.
RE: Hillside Design
Any body got more ideas?
RE: Hillside Design
Mike McCann
McCann Engineering
RE: Hillside Design
The diagram was creasted by us and pile will be designed by us as well. Also,please note, we are using Mat foundation (can be 12'' to 24'' thick if needed). Retaing wall will be designed as cantilever wall.
What we are trying to do is away from hillside design requirements. Any suggestions?
RE: Hillside Design
I would thihnk that means you can not wave the seismic design rewuirements.
Additionally, it seems that the retaing wall design fo rseismic requirements would be significant.
Also, I wonder how differences in bearing conditions are handled. I'm thinking that part of the structure is on deep foundations and part is on shallow. Not familiar with soil types there but generally (around where I work-Cincinnati Ohio) deep and shallow footing settlement differences can be an issue.
RE: Hillside Design