In the spirit of "teach a man to fish", let's work it out:
Assume truss spacing is 2' on center
Assume the ceiling "joist" and "rafters" are 2x6's (conservative; 2x4's might work).
Assume the other truss chords are 2x4's.
"Ceiling joist" truss member is 40' long.
The two "rafters" together are about 45' (based on a 4-in-12 pitch, and assuming some overhang).
We'll assume all the other truss members together total 40 lineal feet.
So we have 85 lineal feet of 2x6 and 40 lineal feet of 2x4.
Assume Douglas fir or Southern yellow pine at a specific gravity of 0.5 giving a density of about 30 pounds per cubic foor.
Dimension of 2x6 is 1.5 by 5.5 inches; this gives 1.5 * 5.5 * 12 or 99 cubic inches per foot. This gives us a wood volume of 0.057 cubic feet per foot.
This gives us a weight per lineal foot of 1.7 pounds, which seems reasonable for a 2x6.
Similarly, our 2x4's weigh about 1 pound per foot.
1.7 pounds per foot x 85 feet = 146 pounds 1.0 pounds per foot x 40 feet = 40 pounds
Total 186 pounds per truss. We'll add another 14 pounds for the metal plates or other gussets and use a budgetary figure of 200 pounds per truss.
One note of caution is that trusses like this are very weak against forces perpendicular to the plane of the truss. They cannot even support their own weight if lifted flat, and will come apart if you try. The truss manufacturers have very specific requirements for how to attach and use lifting slings. Furthermore, because trusses are designed to bear weight only on their ends, a 40 foot long truss may require a spreader bar and two separate slings, even if otherwise handled vertically.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
