SWL (safe working load) vs. factored load

[JohnRwals]

Hi!

I wonder how I can compare factored load with safe working load.
I got barrier cable design with vehicle impact load in the precast concrete parking structure.
When I try to select ferrule inserts, their capacity is given with SWL.
Let's say insert will take factored load 13 kips and insert capacity is SWL=6 kips with safety factor=3.
Can I use this insert?
How can I compare these two loads?

JRW

 

[le99]

I would think F[sub]n[/sub] = 3*6 = 18 kips, and the strength reduction factor is 0.9 (say), thus ØF[sub]n[/sub] = 18*0.9 = 16.2 kips > F[sub]u[/sub] = 13 kips.

 

[driftLimiter]

I would just use the SWL and compare against ASD loading. Unless the manufacturer provides guidance for converting the SWL to an ultimate load I caution against assuming phi = 0.9.

 

[le99]

Yes, depending on the nature of the stress, the load reduction factor can vary.

 

[WinelandV]

Using AISC Omega/Phi factors as a guide....

Phi____ Omega
1.0____ 1.5
0.9____ 1.67
0.75___ 2.0
0.65___ 2.31

So, for a FS 3, I'd be looking at a phi of around 0.5 (ish).

Really, you should be doing what driftLimiter proposes - transforming your ultimate load to a service load.

Please note that is a "v" (as in Violin) not a "y".