Paul,
Basically, the design of OR surgical lighting just follows the requirements of Chapter 13 of the ASCE 7-05 considering the lights as flexible, (2.5 increase), essential facility, 1.5 increase), and a hgih Sds for Southern California, (1.53 for this specific location). This gives you an Fp of 2.2Wp, (ASD). This is somewhat conservative as I am assuming a z/h = 1.0, (one story building), and I guess I could reasonably make it about 0.75 since the light is below the roof line. But, anyway, that is what I am designing the supports for.
Regards,
Larry
> Date: Sun, 14 Jun 2009 13:52:54 -0400
> Subject: RE: OSHPD Requirements for Surgical Lights
> From: ad026@hwcn.org
> To: seaint@seaint.org
>
> Larry,
> Thanks. Of course, we have similar provisions in Canadian code for essential
> facilities. However, I am curious why the OR lights have been described to
> have service connection/support characteristics that would typically exceed
> the essential service requirements.
>
> Is there something special about these lights and the service support
> requirements or is it simply an issue that by the time you accomplish an
> adequate support design due to other considerations, the design will exceed
> any rational (or irrational) expectations and code requirements?
>
> Regards
> Paul
> --
> Paul Ransom, P.Eng.
> ph 905 639-9628
> fax 905 639-3866
> ad026@hwcn.org
>
>
> > From: Larry Hauer <lhauer@live.com>
>
> > Essential facilities in California require special considerations.
>
> > Larry Hauer S.E.
>
> >> Not having done any OR lighting support=2C I have to ask the question ...
> >> Why are these so special?
>
> >> Regards
> >> Paul
>
> >>> From: "Donny Harris" <dharris@kpff-la.com>
> >>> Keith is correct=2C the service design criteria is very important in these
> >>> cases and often controls the design if you are doing odd connections
> >>> trying to avoid the typical clutter in an OR ceiling. Lots of bracing is
> >>> key (pay attention to torsion with the brace layout) and any type of
> >>> cantilever design should be avoided if possible. If you are installing
> >>> ...
>
> >>> Donny Harris=2C SE=3D20
> >>> California
>
>
> ******* ****** ******* ******** ******* ******* ******* ***
> * Read list FAQ at: http://www.seaint.org/list_FAQ.asp
> *
> * This email was sent to you via Structural Engineers
> * Association of Southern California (SEAOSC) server. To
> * subscribe (no fee) or UnSubscribe, please go to:
> *
> * http://www.seaint.org/sealist1.asp
> *
> * Questions to seaint-ad@seaint.org. Remember, any email you
> * send to the list is public domain and may be re-posted
> * without your permission. Make sure you visit our web
> * site at: http://www.seaint.org
> ******* ****** ****** ****** ******* ****** ****** ********
Hotmail® has ever-growing storage! Don't worry about storage limits. Check it out.