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RE: (Fwd) Re: FW: Open Web Steel Joist Programs?

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Gary,

Thanks for your feedback.

What is your opinion of situation in which an engineer is asked to analyze an existing joist for new loads and no drawings or manufacturer information are available. The engineer goes out and measures the existing member, analyzes the joist as a simple truss, externally reinforces web and chord members with field welded plates, bars, angles, etc. and does not try and confirm the load path mechanism and consequently the disposition of the welds at the existing panel points. I'm thinking primarily of top chord panel points with bar web members in which the panel point weld is more than likely both concealed and inaccessible unless the roof is removed.


Matthew Stuart
Structural Dept. - Manalapan
732-577-9889 x1283


-----Original Message-----
From: Gary Hodgson & Associates [mailto:ghodgson(--nospam--at)vaxxine.com]
Sent: Friday, February 04, 2005 8:56 AM
To: seaint(--nospam--at)seaint.org
Subject: (Fwd) Re: FW: Open Web Steel Joist Programs?


------- Forwarded message follows -------
From:                   Gary Hodgson & Associates <ghodgson(--nospam--at)vaxxine.com>
To:                     "Stuart, Matthew" <mstuart(--nospam--at)schoordepalma.com>
Subject:                Re: FW: Open Web Steel Joist Programs?
Send reply to:          ghodgson(--nospam--at)vaxxine.com
Date sent:              Fri, 04 Feb 2005 07:52:06 -0500

On 3 Feb 2005 at 8:37, Stuart, Matthew wrote:

> I didn't see my post come through the server so I thought I would
> send it directly to you as well.
>
> Matthew Stuart
> Structural Dept. - Manalapan
> 732-577-9889 x1283
>
>
> -----Original Message-----
> From: Stuart, Matthew
> Sent: Thursday, February 03, 2005 8:20 AM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: Open Web Steel Joist Programs?
>
> Just out of curiosity, do you provide the manufacturer with panel
> point weld requirements or do they have standard shop welds that you
> have pre-approved?

Both.  Under the canadian system, all fabricators doing
any welding of structural steel have to be certified by
the Canadian Welding Bureau and have to have a retained
or staff engineer who prepares welding procedures to be
approved by the CWB.  If they have in-house procedures
for flare bevel welds of round bar, then they can use
their own shop welds. If they don't have them, I restrict
them to square/rect bars with fillet welds, or I will
prepare weld details for them to submit to CWB.
>
> Also, are you accustomed to the EOR providing you with net uplift
> forces (for roof applications) to enable the analysis of the bottom
> chord for compression or do you typically have to develop these
> loads yourself?

Both again. Some engineers do provide uplift forces and some lazy
types just say "design for forces in accordance with National
Building Code of Canada".  Some do not even think of the uplift
forces, and occasionally they make the blue pages(discipline cases)
of the association of Professional Engineers of Ontario. Hope this
helps.

Cheers Gary



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