sawn – Wood Engineering

E min

By WoodEngineering Posted on April 1, 2022 Posted in Uncategorized Tagged with apparent, beam, bend, collapse, column, COV, COV E, deflect, deflection, design, deviation, E, E app, E min, E true, girder, glued laminated timber, glulam, grade, joist, laminated, lateral torsional buckling, LTB, lumber, modulus of elasticity, MOE, NDS, post, rafter, reference, rupture, safety, sag, sawn, serviceability, shear, shear fee, sort, species, stability, standard, standard deviation, Supplement, variability, wood, Young’s modulus

E min (c) Jeff R. Filler, Pell City, Alabama, 2022 But First, E apparent and E true `E min’ is calculated wood property used in the design of structural wood members (beams, columns, etc.). It is a derived property, derived …

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Accuracy of Deflection Calcs (and Eee)

By WoodEngineering Posted on April 1, 2022 Posted in Uncategorized Tagged with accuracy, accurate, allowable, beam, bend, calc, calculation, coefficient of variation, COV, deflection, E, elasticity, glulam, joist, load, lumber, modulus, modulus of elasticity, MOE, National Design Specification, NDS, rafter, sag, sawn, simple, span, variability, wood

In the example above (link) we calculated a deflection of 0.599 in. How accurate is this number? (I showed it to three significant figures … accurate to half a percent?) Leaving out, for now, the accuracy/precision of the other input, …

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E app (Apparent Modulus of Elasticity)

By WoodEngineering Posted on March 31, 2022 Posted in Uncategorized Tagged with apparent, beam, bend, bending, bounce, column, composite, concentrated, deflection, deform, design, E, E app, E min, E true, elasticity, G, Gere, girder, glulam, I-joist, joist, load, lumber, materials, mechanics, Mechanics of Materials, modulus, moment of inertia, national, National Design Specification, NDS, plane, plank, post, prefab, rotate, safe, sag, sawn, SCL, shear, simple, specification, stability, strain, stress, structural, Supplement, true, variability, wood, Wood Handbook (WH), Young’s modulus

E app (`Eee app’, `Eee apparent’, Apparent Modulus of Elasticity) is a design property for wood construction. It comes from the Modulus of Elasticity of the wood (E, MOE, Young’s Modulus). It’s not a `true’, or `pure’ property, and it …

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Concentrated load check …

By WoodEngineering Posted on July 2, 2021 Posted in Uncategorized Tagged with area, bending, check, concentrated, load, lumber, moment, roof, sawn, uniform

Okay, now let’s do a (free, online) check of the concentrated load situation. Note that I am looking at the concentrated load separately from the uniform 20 psf live load … yeah!, the two loads are not taken to act …

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roof rafter calcs … BENDING STRESS

By WoodEngineering Posted on June 30, 2021 Posted in Uncategorized Tagged with beam, bending, concentrated, design, dimension, flexure, live, load, lumber, moment, rafter, roof, rough, sawn, self, stress, uniform, weight, wood

Designing a roof rafter … (bending stress) … Linda wants a barn-shelter for her goats. Okay – I’ll do it. `Twelve by twenty-four.’ `Let’s go walk the site. It’s got some slope. I’ll make a stepped-barn, each section will be …

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a truss for Miles

By WoodEngineering Posted on June 23, 2021 Posted in Uncategorized Tagged with bottom stress, chord, construction, download, engineering, equilibrium, gravity, hand, joints, load, lumber, method, pins, rough, sawn, section, spreadsheet, statics, tension, truss, uplift, wind, wood, working

Miles asked me to design a truss for his shop. I grabbed my clipboard. Wood? Yes. Rough sawn? Yes. Rise/Run? 4/12. Width? 21 feet. (Hmmm … I am sketching as we go along.) Oh, 20. You mean 20 to center? …

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Tag: sawn