Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Components & Cladding for Wood Roof Trusses

[Subject Prev][Subject Next][Thread Prev][Thread Next]
I talked to him again.  He said that he had an article from the plate folks that said MWFRS was appropriate and that it referred to ASCE7.  When I asked which version he said '88.  I faxed him the provision in '98 that said C&C.  I'm in a 70mph zone for SBC and 90 for IBC/ASCE7.  He was using 80mph.  I assumed SBC.  The drawings called for 70 mph SBC.  He changed it so it's C&C and to 70.  After more conversations I realized he went to 70 mph ASCE7.  The person I'm talking to is someone I personally know through Habitat for Humanity.  The company he works for is one of the better suppliers in central AL.  He has an AE degree to boot.  He's trying to do the right thing, but the propaganda he's being fed from the plate end is a bit scary.  It's scary to me because this guy is "one of the good guys."  If there is this much code confusion on his end then what's it like for smaller jobs supplied by smaller manufacturers.   He's making it right and hand delivering a new set of submittals today.  I'm going to be even more wary on future jobs with other suppliers.

When I see/type C&C the last thing that comes to mind is Components and Cladding.  Have a Crown and Coke, it's 5 o'clock somewhere.

Thanks for everyones help.

John C. Jones, PE
Barnett Associates
Pell City, AL
205-884-5334
205-884-0099 (fax)


-----Original Message-----
From: Kestner, James W. [mailto:jkestner(--nospam--at)somervilleinc.com]
Sent: Wednesday, April 14, 2004 2:36 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Components & Cladding for Wood Roof Trusses


John:

I would call his bluff and have his PE write a letter stating to you that the trusses only have to be designed for MWRFS and not C&C. Also have him refer to the specific section of the ASCE 7-98 that states this.

Jim K.

-----Original Message-----
From: John C. Jones [mailto:john(--nospam--at)struct-engr.com]
Sent: Wednesday, April 14, 2004 9:58 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Components & Cladding for Wood Roof Trusses


Wow, I had to do a double take because I typed a message with almost this exact title and then didn't send it to the group.

That's how I specify.

Here was what I started to post...I came across some shop drawings that said the trusses were designed as MWFRS.  I questioned the supplier and he said that he could get a bunch of PE's to say that MWFRS is the way they should be designed.  I asked if these people work for the truss industry.  The answer was yes.  This is nuts, evidently all trusses designed using software and plates made by Robbins Engineering are designed as MWFRS.  Be on the lookout for this.

John C. Jones, PE
Barnett Associates
Pell City, AL
205-884-5334
205-884-0099 (fax)


-----Original Message-----
From: Kestner, James W. [mailto:jkestner(--nospam--at)somervilleinc.com]
Sent: Wednesday, April 14, 2004 9:33 AM
To: SEAINT
Subject: Components & Cladding for Wood Roof Trusses


ASCE 7-98 requires that wood roof trusses be designed for C&C loading with Zones 1, 2 and 3 and overhangs. It seems impractical for the EOR to list all the loads for the truss designers because of the various effective areas for different trusses. About the best that we can do is to reference that the truss designer needs to comply with the C&C requirements of ASCE 7-98. Additionally, our drawings must list: Basic Wind Speed, Importance Factor, Exposure Factor and Internal Pressure Coefficient and minimum dead load (to determine net uplift).

Does anyone else specify C&C loads differently? 

Does the typical truss designer know how to handle this loading or is it done automatically for him? Does the typical truss program take these C&C loads into account? 

Jim K.




******* ****** ******* ******** ******* ******* ******* ***
*   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(--nospam--at)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 
******* ****** ****** ****** ******* ****** ****** ******** 

******* ****** ******* ******** ******* ******* ******* ***
*   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(--nospam--at)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 
******* ****** ****** ****** ******* ****** ****** ******** 

******* ****** ******* ******** ******* ******* ******* ***
*   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(--nospam--at)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 
******* ****** ****** ****** ******* ****** ****** ******** 

******* ****** ******* ******** ******* ******* ******* ***
*   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(--nospam--at)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
******* ****** ****** ****** ******* ****** ****** ********