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Author Topic: Is This Your Homemade Stamp?  (Read 4679 times)

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Offline Don P

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Re: Is This Your Homemade Stamp?
« Reply #80 on: August 08, 2021, 08:24:11 AM »
Stream of consciousness  :D.

For instance a stud is a #3 with #1 edge restrictions. A column doesn't require much bending strength but you gotta have something to nail the drywall to.

MSR, machine stress rated, is simply a set of rollers top and bottom that lumber is fed through flatways. It is checking stiffness. In the lab they have broken multiple pieces to develop a relationship between stiffness and bending strength, E's relationship to Fb. Compression wood is one example where the wood will be unusually stiff but also weaker in bending, that relationship between stiffness and strength is not "normal".  This must be constantly checked and monitored in the lab and on the floor. Also the board isn't reading until it is on the rollers, so the foot or so at each end is not being checked by the machine. Then as hacknchop mentioned some of the restrictions have nothing to do with strength but are related to serviceability..

For typical lightweight trusses, the top and bottom chords experience bending. The web members are in tension or compression. MSR lumber that has been checked for stiffness and bending is not really an advantage in those web members. Column buckling is a function of stiffness but I don't believe they have or use that correlation, yet.
The future is a foreign country, they will do things differently there - Simon Winchester

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