Large uplift forces
Large uplift forces
(OP)
AISC has a detail on page 14-9 of the 13th edition manual (Fig 14-7(b)) that I'm trying to find a design example for for all of the components. Does anyone know where to find one?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
Not quite what I'm looking for.
RE: Large uplift forces
To be perfectly honest, I designed them one a piece-by piece basis using basic stress analysis, ASD and applying allowables where I could. I have always found Blodgett to be VERY practical and I used many of the same approaches.
Most of the large bases you see basically try to get away from having a plate in bending by substituting what is basically a built up beam to take the bending while transmitting tensile forces to the anchorage.
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
RE: Large uplift forces
He also tackles stiffened seats - basically what you are doing upside down in Section 5.3. Note that Salmon and Johnson have updated ideas on calculating the stiffened seat with some different equations for the capacity of the stiffener. (Basically trying to isolate a portion of the stiffener and treat it as a column and them applying some flat plate theory limitations)
Have fun! Its a great problem to investigate in heavy industrial work.
RE: Large uplift forces
anyway, i am still hurting from the interview i had with them 2 weeks ago.. asking me about expansion joint for long piperack modules.. which i probably gave a stupid answer coz i didnt get the job.. =(
RE: Large uplift forces
I'm just using the provisions from AISC spec section J10.8, which kicks you back to E6.2 or J4.4, depending on the slenderness. J10.8 also allows you to use kl=0.75h.
Does this seem reasonable?
RE: Large uplift forces
As I alluded above, in situations where there isn't a specific design example, just apply your knowledge as you see fit and bounce it off a few guys to see if there is anything you might have missed.
I have run into situations like this a lot doing heavy industrial work.
This is probably why companies like Bechtel wind up with teams of guys doing research for them.