LRFD Design Method 2

[Veer007]

Hey All, Please refer to the snap below, to be clear, Note 4 says all shown reactions in the plan are factored in. So can I design all connections according to LRFD? right

Thanks in advance!!

 

[jayrod12]

I wouldn't be so sure and would be submitting an rfi to the EOR.

It would likely be conservative to do so, therefore could move forward under that assumption. However since you're asking here, may as well ask the person that prepared the drawings.

 

[Veer007]

Thank you Jayrod12, I thought I could guess it with this sentence saying factored reactions...


Thanks in advance!!

 

[Settingsun]

In practical terms, I see this as ULS loads. However, if something were to go wrong, they may argue they were serviceability factors (maybe not in USA where I gather there isn't a serviceability limit state defined in the codes).

Limit state design makes sense to me, but I wonder whether it's worth it overall with this tower of Babel situation we now have.

 

[phamENG]

A lot of engineers do use "factored" to mean LRFD. But on a more fundamental level, a factor is just a number you multiply by another number and by that definition the ASD load combinations end up giving you a "factored" load (the factors being 0.6, 0.75, 1.0, etc.).

So yeah...ask the EOR. Or look at the general notes/specs. I usually put it right on the first sheet of the structural drawings if I'm using LRFD or ASD if I have any delegated design.

 

[271828]

I do delegated connection design and would send an RFI.

While you're at it, ask for clarification about Note 4, second sentence. "Loads less than 15 kips have not been shown." shows up from time to time. Does that mean any connection without a reaction shown can be designed for 15 kips? The first time I sent an RFI for this was when there was no reaction indicated on a beam, and it seemed like the reaction would be a lot higher than 15 kips.

 

[SandwichEngine]

I agree with everyone above. We use a program that generates wind load maps for roofs to go in our drawings. You can set it to show the LRFD loading or the ASD loading. You can tell the difference because the ASD loading is labeled "factored."