Issue link: http://alpine.uberflip.com/i/684939
Loading Class Manual for intelliVIEW – Chapter 3 Pounds per Square Foot (PSF) / Pounds per Lineal Foot (PLF) Most loads are entered in pounds per square foot (PSF). How do PSF loads translate into pounds per lineal foot (PLF) loads? How does one convert the pounds per square foot to pounds per lineal foot? The example roof section shows the sheathing on the top and bottom chords of the trusses. The sheathing transfers the applied loads from one truss to another. The top chord load will be transferred to the adjacent top chords and the bottom chord load will be transferred to the adjacent bottom chords. To calculate the PLF loading on the truss chords, multiply the PSF by the on center (O.C.) spacing of the truss: (PSF)(TRUSS SPACING)=PLF In the above example, the trusses are spaced 2' O.C. and the total load is 40 PSF. (40 PSF)(2' O.C.)= 80 PLF Let's break the load down to determine where it is actually distributed on the truss. The total top chord load = 30 PSF and the total bottom chord load = 10 PSF. Using what you have learned calculate the Top and Bottom chord PLF. (____ Total Top Chord PSF)(____' O.C.)= ____ Total Top Chord PLF (____ Total Bottom Chord PSF)(____' O.C.)= ____ Total Bottom Chord PLF