Safety factor for administrative hypothesis
Safety factor for administrative hypothesis
(OP)
I've received a pole des project where the client requires the following:
For administrative hypothesis:
A safety factor of 1.8
Wind pressure on the face of the pole: 840 Pa
For extreme wind:
A safety factor of 1.1
Wind pressure on the face of the pole 2050 Pa
My question is, what exactly is it refering to?
Is extreme wind a reference to Ultimate limit states? Or accidental winds?
Is administrative hypotesis refering to Serviceable limit states?
For administrative hypothesis:
A safety factor of 1.8
Wind pressure on the face of the pole: 840 Pa
For extreme wind:
A safety factor of 1.1
Wind pressure on the face of the pole 2050 Pa
My question is, what exactly is it refering to?
Is extreme wind a reference to Ultimate limit states? Or accidental winds?
Is administrative hypotesis refering to Serviceable limit states?






RE: Safety factor for administrative hypothesis
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RE: Safety factor for administrative hypothesis
With that being said, it sounds like maybe there is a language translation issue here - I could see the "service" in "service loads" being translated as "administrative".
RE: Safety factor for administrative hypothesis
RE: Safety factor for administrative hypothesis
It's been a little while since I worked with ASCE 48, but I don't think the factors of safety mentioned refer to ULS or SLS specifically. Just that they want your structure to resist a "common" wind load with an F.S. of 1.8, and an "extreme" wind load with a F.S. of 1.1.
Never heard of accidental wind.
But all that said -- pick up the phone and ask the client.
RE: Safety factor for administrative hypothesis
The client is Indian, so the language is probably Hindi, and I can't contact him so far.
Edit: I received the data in english language
Anyways thanks for all your help
RE: Safety factor for administrative hypothesis
another day in paradise, or is paradise one day closer ?
RE: Safety factor for administrative hypothesis
A SLS that is more burdensome than ULS makes no sense in my opinion. I'll try to contact the client and provide feedback if possible.
RE: Safety factor for administrative hypothesis
another day in paradise, or is paradise one day closer ?
RE: Safety factor for administrative hypothesis
RE: Safety factor for administrative hypothesis
If you are designing for strength under both load combinations, then they are both ULS.
To have a frequent ULS with a high load factor being the critical condition, rather than a rarer ULS with a lower load factor, is not at all unusual.
Indeed it is a desirable outcome, where achievable.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Safety factor for administrative hypothesis
Also, the largest wind load will occur when the winds "sees" all 4x guy ropes. There will never be a reasonable case when the central vertical mast "hides" the downstream guy ropes.
RE: Safety factor for administrative hypothesis
I don't think he is talking about a guyed pole...didn't mention guys.