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Re: Cantilevered Stairs

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Dominic,

If the EOR has specified anything for the members, you are not designing the
stairs, the EOR did.  If the drawings are incomplete or unbuildable the EOR
should finish the design.
When stairs or other components are specified as design build (by-others)
then they are design build.  The only requirement you need concern yourself
with is the Architectural appearance and where the line of responsibility
changes from component engineer to base building engineer.  Design the stair
so it works, then coordinate the support requirements with the EOR and the
fabricator, and through him the general etc.  The coordination part is the
most important.  If the EOR did not design the stair (or other specialty
components in general), there is no way the actual support requirements
could have been pre-determined.  Clearly identify the points of contact, the
forces to be transferred to / resisted by the base building, and the
parameters of required attachment (details).  Any EOR worth their salt will
require this information prior to designing the support members for anything
but the most rudimentary and standard components.

Paul Feather

----- Original Message -----
From: "Domenic DeAngelo" <domdean(--nospam--at)mediaone.net>
To: "Domenic DeAngelo" <domdean(--nospam--at)mediaone.net>; <seaint(--nospam--at)seaint.org>
Sent: Saturday, July 29, 2000 2:01 PM
Subject: Re: Cantilevered Stairs


> Sorry, I forgot to change the subject.
>
>  Help!
>
>  I have been asked to design a cantilevered set of scissor stairs for a
> fabricator. The floor to floor elevation is 18 feet and the horizontal
> cantilevered length is 23 feet (including treads and landing).  The
overall
> width of the stairs is 12 feet 3 inches with each stair width equal to 5
> foot 4 inches. The engineer of record called out for TS20 x 4 x 3/8 ouside
> and inside stringers as well as a TS8 x 8 3/8 under the treads (centered
> between the inside and outside stringers).
> >
> I have not done anything like this in the past and would appreciate input
> from anyone on the list.
>
> Thanks in advance,
>
>  Domenic DeAngelo P.E.
>
>
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