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Re: Channel Spec

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I reviewed some drawings that I detailed for a bridge in New York in 1958:  “15C33.9” with the C drawn vertically as a channel shape.   I was using the 5th edition steel handbook at that time.  My 1st edition (7th printing) doesn’t provide much guidance on the steel detailing at that time.

 

On both the 4th edition and the 5th editions in part 1 at the beginning of the manual shows examples of how rolled sections are to be indicated on the design drawings.  Both editions show the channel as a |___| section.   In the 6th edition, the channel is rotated vertically such as "12C20.7"  I don't know when the designations were changed to something like C12x20.7.


Neil Moore




On 2/22/2011 9:22 AM, Garner, Robert wrote:

We still do that today with two little back to back C’s to indicate double wales on our sheet pile walls.

 

Bob G.

From: h.d.richardson [mailto:h.d.richardson(--nospam--at)shaw.ca]
Sent: Tuesday, February 22, 2011 9:17 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: RE: Channel Spec

 

Thor,

 

        I've seen that format on drawings before.  Some draughtsmen with a European background used to write it that way in the days when people used hand lettering on drawings.

 

Regards,

 

H. Daryl Richardson

----- Original Message -----

To: SEAInt

Sent: Monday, February 21, 2011 11:35 PM

Subject: Re: RE: Channel Spec

 

... a rose by any other name ... I was wondering more about from whence the "U" came ...

Sent on the TELUS Mobility network with BlackBerry

From: Tripp Howard <tripphoward(--nospam--at)gmail.com>

Date: Mon, 21 Feb 2011 19:38:11 -0800

Subject: Re: RE: Channel Spec

 

It's a channel. "Purlin" just describes its function. If it's on the roof it's a "purlin". Same section on the wall would be a "girt".

On Feb 21, 2011 4:46 PM, "Thor Tandy" <vicpeng(--nospam--at)telus.net> wrote:
> That's what I figured but the dwgs done in 1965 show 8U11.5 but also adds
> "purlin" so I'm guessing it's a "purlin" section rather than a channel . it
> sure looks like a channel on site .
>
>
>
> From: Tripp Howard [mailto:tripphoward(--nospam--at)gmail.com]
> Sent: Monday, February 21, 2011 4:18 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Channel Spec
>
>
>
> Looks like a C8x11.5 (8" deep, 11.5 lbs/ft)
>
> On Mon, Feb 21, 2011 at 3:58 PM, Thor Tandy <vicpeng(--nospam--at)telus.net> wrote:
>
> Does anyone know the designation "8U11.5" as applied to a channel section?
>
>
>
> TIA
>
>
>
> Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE
> Victoria, BC
> Canada
>
>
>
>
>
>
>
>
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