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Thanks for all the replies again, I like the discussion. Responding to Dik: the thickness of the piles helicesthat my company installs (I'm guessing that's what you mean by spiral) is 0.375" thick for all sizes; what I really design for as a structural engineer is the diameter of the helix, the...

Responding to Dik: I´m not necessarily against that, but the company that I'm doing the design for is a helical pile installer so the ideal situation is one where you don't depend on concrete to provide a solution as that eliminates one of the big advantages of working with helical piles, which...

Hello, I'm in charge of designing an anchoring system for a 8,5' wide x 48' long x 8'-11" trailer. The system is only supposed to resist loads caused by seismic and wind action, dead load is taken care of by the trailers own supporting system (basically the wheels and an additional support)...

The piles are spaced at 5'-2" at the most, to be honest I sized the beam like that because I'm not sure on how to proceed with the bracket design (basically that it fits and doesn't surpass the concrete breakout capacity). Regarding the type of support, wouldn't it be fixed considering the fact...

Thanks for your replies guys, Kootk, following up on your response, other questions have come up on my end an I wanted to try and get an answer from you since you seem to be experienced with this foundation design. 1. I was investigating on the actual design of the grade beam, and it seems...

Hi, I'm currently responsible for the design of a manufactured home foundation, the client wants to have it supported by a perimeter grade beam which at the same time is supported by piles. I'm having a hard time coming up with a way to confidently analyze the foundation system due to several...

Hello, I'm currently designing the foundation for a manufactured house with an 18" crawl space. The client gave us some typical drawings of their past projects and they use a perimeter wall that covers the crawl space basically. For me it seems like a pretty good choice for this type of house...

Hello, I'm looking to evaluate the feasibility of using helical or screw piles for the foundation of houses on a pretty steep hillside (about 30º). My initial assumption is that it's definitely possible, I've seen some constructions that have been done in that manner but they seem to be pretty...

Hello, I have two doubts that have been bothering me for a while and I can´t seem to find any information about them, the first is about what is done with grade beams when they go through construction joints, and the second is about grade beams that in the direction of the slope of the terrain...

Thanks everyone, I ended up using 0.85 anyway so I guess it was me trying to over complicate things, much simpler than I thought in the end.

Yeah I get the confusion, the pile cap or grade beam (not sure what to call it) is there because there´s a pretty steep slope along the sign but you can´t see it in the picture. It was an attempt to embed one of the piles in something solid instead of having it in the air, however, the grade...

I´m actually freelancing right now so there's no office, but here are the elevations of the sign as you said.

Ok, first of all thanks a lot, you've all been helpful, now for the problem at hand, I ended up going with Section 29.4 of ASCE 7-10 as phamENG mentioned, so it seems like estimating the frequency is unavoidable, I´ve actually never done that by hand to be completely honest, only with Structural...

I'm in the middle of a design for a sign, the foundations actually, but I'm not very familiar with US codes and talking to an experienced engineer he suggested I use AASHTO for the determination of the wind loads, the thing is I can't seem to find an AASHTO code that's not about bridge design...