## 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. We arrived first at a size 6.75 in. x 27 in., but it was not quite sufficient. So we ended …

## 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 …

## Deflections of Wood Beams

When we examine deflections of wood members (beams, joists, rafters, girders, etc.) we generally look at two kinds, actually three … the deflection due to the `live load’, e.g., people walking on a floor, wind on a wall, and so …

## Shear-Free Eeee

E (E and shear-free E) (c) Jeff R. Filler, 2022 The deflections calculated in earlier examples (link and link) are based on the standard engineering formula for beams based on beam-curvature theory – where the beam curvature is a result …