Truss Structure. - Building & Construction - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Truss Structure.

 Thread Tools Tweet Share Display Modes
04-09-2010, 10:17 AM   #1
Newbie

Join Date: Apr 2010
Posts: 1
Rewards Points: 10

## Truss Structure.

1 - How is the weight of concrete roof tiles distributed evenly on a series (say 4 to 6 ) roof trusses?

2 - How is the combined weight of the roof trusses and concrete roof tiles transfered to I-beams that support all this combined weight?

I ask these questions because I want to determine what size I-beams I would need to support my steel truss structure and the concrete roof tiles.

Thanks,

AKB

 04-09-2010, 10:23 AM #2 Member   Join Date: Nov 2009 Location: central virginia mountains Posts: 1,857 Rewards Points: 1,000 no one here will tell you that, find an engineer __________________ The older I get the better I was

04-10-2010, 02:25 AM   #4
Member

Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,936
Rewards Points: 1,178

## ??

I'm a tad confused by your question too, but, yes, it is engineer time. One thing I have recently learned, though, is that a truss will transfer 5/8 of its load to a load bearing wall at its center, 3/16 of the load to each wall. If you do go this alone, be sure that you are reading UNIFORM load tables if your trusses are uniformly places along the beam. A beam carries about 1/8 as much weight at its center as it does uniformly. Again: I'd bite the bullet and get an engineer to at least verify or refute your calcs. It's really cheap compared to a failed structure. Good luck! j

04-10-2010, 10:31 AM   #5

Join Date: Dec 2008
Location: New Jersey
Posts: 757
Rewards Points: 844

Quote:
 Originally Posted by jklingel I'm a tad confused by your question too, but, yes, it is engineer time. One thing I have recently learned, though, is that a truss will transfer 5/8 of its load to a load bearing wall at its center, 3/16 of the load to each wall. If you do go this alone, be sure that you are reading UNIFORM load tables if your trusses are uniformly places along the beam. A beam carries about 1/8 as much weight at its center as it does uniformly. Again: I'd bite the bullet and get an engineer to at least verify or refute your calcs. It's really cheap compared to a failed structure. Good luck! j
YIKES! Try not to throw numbers around. There are so many variables involved (load path, truss geometry, pinning, load cases) that making a blanket statement on a DIY thread that a truss will transfer 5/8 of the load to a center support is downright dangerous. That's just not the case for every real world scenario.

04-10-2010, 02:56 PM   #6
Member

Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,936
Rewards Points: 1,178

## numbers are our friends

Aggie: OK. I hear you. That was info I got from some building science gurus, and I assumed it was, in general, correct. I always assume that anyone on a forum will double check any suggestions/info, whether from an engineer or just some diy cat. IYO, is there a generality for the per cent of load on a bearing wall at the center of a truss? Thanks. j

04-10-2010, 08:47 PM   #7

Join Date: Dec 2008
Location: New Jersey
Posts: 757
Rewards Points: 844

Quote:
 Originally Posted by jklingel Aggie: OK. I hear you. That was info I got from some building science gurus, and I assumed it was, in general, correct. I always assume that anyone on a forum will double check any suggestions/info, whether from an engineer or just some diy cat. IYO, is there a generality for the per cent of load on a bearing wall at the center of a truss? Thanks. j

Actually when I design framing and foundations, I do the tried and true old school top to bottom method, and there is no generality. It takes about 6 hours to do the calcs on a typical residential house, and the process generates 30 some odd pages of calcs. There is software out there, but I only use it in special situations.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Jubinell Building & Construction 5 12-02-2009 10:39 AM seth Building & Construction 6 07-18-2009 08:23 PM Sonnie Building & Construction 7 02-06-2009 09:45 PM fisherk Carpentry 1 10-18-2008 01:08 PM fauer Carpentry 3 09-30-2007 08:36 PM

Top of Page | View New Posts