Lateral Support … (at midspan)
As part of a recent post (here) we looked at the required size glulam beam to support a roof load (snow plus dead) of 21,000 pounds across a span of 32 feet. (Yeah, a lot of snow.) In that post …
Tag: beam
`E005′
In an earlier post (here) we looked at the probability of occurrence of some wood products ending up out in the field … say, in buildings, having actual modulus of elasticity values equal to (as low as) the values used …
what are the chances?
In a previous post (here), we determined the size glulam roof beam required to not deflect more than 1.00 inches (under design load). We arrived first at a size 6.75 in. x 27 in., but it was not quite sufficient. …
Ex min or Ey min
This will probably be my shortest post. … In the determination of wood beam stability (lateral torsional buckling) with respect to bending about the X-X axis, use Ey min (not Ex min). The context here is structural glued laminated timber …
E min and `Never’
I continue to be mesmerized by this thing called `E min’. E min is the `minimum modulus of elasticity’ used in stability calculations in wood engineering design. E min (hereafter just Emin) is based on `regular’ modulus of elasticity, E. …
Absolute Deflection
Let’s look at a situation where, after construction, it is required that a certain roof beam experience a deflection of not more than 1.0 inches (in.). The deflection limitation comes about by a required clearance between the ceiling and some …
Glulam MBF
So, in another post we looked at `board feet’ (BF), or `board foot measure’ (BFM). Now we’ll look at BF for structural glued laminated timber (glulam), and MBF, or MBFM. From the earlier post, amount of lumber is often described …
AITC 119 and EEEE
I was doing some reading in AITC 119 Standard Specifications for Structural Glued Laminated Timbers of Hardwood Species, Section 4.1.6 … “ … modulus of elasticity, E, values herein are the average values … The modulus of elasticity of wood …
Jamming Jack Studs
The nice thing about a stiff beam is that it won’t sag much. The not-so-nice thing is that it won’t `give’. In new construction, wood framing more or less starts from the ground up; wood members are placed on top …
E (modulus of elasticity) of Wood
The modulus of elasticity (MOE, E) of wood is most commonly used in the calculation of deflections (sag) of wood beams. By `beams’ I include joists, rafters, girders, decking boards, any … wood used structurally to support loads across spans …