2 edition of strength of second-growth Douglas fir in tension parallel to grain found in the catalog.
strength of second-growth Douglas fir in tension parallel to grain
Antone C. Van Vliet
Written in English
|Statement||by Antone Cornelis Van Vliet.|
|The Physical Object|
|Pagination||36 leaves, bound :|
|Number of Pages||36|
civil engineering. Wood Engineering Properties #2. Civil Engineering Design and Engineering. Strength and engineering properties of some commercially important . Universally recognized for its superior strength to weight ratio, Douglas Fir is often the wood of choice specified by architects and engineers for use as structural timber. In strength, Douglas Fir rates the highest of any western softwood for: extreme fiber stress in bending; tension parallel-to-grain; horizontal sheer; compression.
Lumber strength properties are assigned to five basic properties: fiber stress in bending (Fb), tension parallel-to-grain (Ft), horizontal shear (Fv), compression parallel-to-grain (Fc), and compression perpendicular-to-grain (Fc |). Douglas-fir is the only redwood-type material still available in substantial volumes of clear wood and is characterized by having the highest ratings of any western softwood for extreme fibre stress in bending; tension parallel-to-grain; horizontal sheer; exceptional strength, hardness and durability.
Examines current industry standards concerned with the use of wood and wood products. Features detailed studies of joists, special beams, residential trusses and arches. Contains accessible tables in order to figure out the most economical way of building a . The compressive strength perpendicular to grain (bearing strength) is one property of wood which is important for structural design. The bearing strength is important for the the wood cells are oriented parallel to the longitudinal axis of the tree. The most common type of cell in softwood is the so called tracheid; a tube-shaped cell with.
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The strength of second-growth Douglas fir in tension parallel to grainAuthor: Van Vliet, C Antone. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).
mation about second-growth Douglas-fir: Average tensile strength parallel to grain using the standard ASTh (1, p.
22) test specimen. Specific gravity data. Effect of growth rate, specific gravity, and type of sampling on tension parallel to grain.
Associated work General. Ina cooperative project was started by the Forest. TO-GRAIN STRENGTH OF DOUGLAS-FIR J. Bawett Hesearcll Scientist, Ilepa~tn~ent of the Enviromnent, Canatlian Forestry Service, Western Forest Prtrtlucts Laboratory, Vancouver, B.
VGT 1x2 (Received 15 hlay ) ABSTRACT The strength of wood in tension pelyendicular-to-grain has been studied by severalCited by: This study investigated the tensile strength of Douglas-fir loaded at an angle to the grain.
Strength was determined for grain angles of 15, 30, 45 and 60 degrees in the radial-longitudinal plane. Strength was found to drop dramatically from a grain orientation of zero to 15 degrees. Weibull's theory of brittle fracture is applied to the determination of strength of Douglas-fir wood in tension perpendicular to the grain.
Results from tests on blocks of glued-laminated material uniformly stressed in tension are used to derive ultimate stresses, at a given survival probability. Strength Properties Common Properties Mechanical properties most commonly measured and repre-sented as “strength properties” for design include modulus of rupture in bending, maximum stress in compression parallel to grain, compressive stress perpendicular to grain, and shear strength parallel to grain.
Additional measurements are oftenFile Size: 1MB. Tension parallel to grain Shear parallel to grain Compression perpendicular to grain Compression parallel to grain Modulus of elasticity Fb Ft Pu Fc1 Fc E Fb ’ Ft ’ Fv ’ FcI ’ Fc ’ E’ Adjustment Factors: Some decrease other increase tabulated value (Textbook, Sectionsand design example in Sectionand NDS File Size: KB.
Lumber strength properties are assigned to five basic strength properties: fiber stress in bending (Fb), tension parallel-to-grain (Ft), horizontal shear (Fv), compression perpendicular-to-grain (Fc) and compression parallel-to-grain (Fc//).
Wood is very strong in compression parallel to the grain and this is seldom a limiting factor in furniture design.
It is considerably weaker in compression perpendicular to the grain. An example of this type of compression would be the pressure that chair legs exert on a wooden floor. calculate deflection). Design values for a column would be compression parallel to the grain and modulus.
For a chord in a truss under tension, the tension design value would be needed. The next slide will illustrate the definitions of the terms “perpendicular to the grain” and “parallel to the grain”.
• F b Bending (typical beam. Structural Wood Lumber Engineering Properties Chart 2" to 4" thick, 2" and wider. Size (inches) Grade: Extreme Fiber Stress in Bending "F b " psi Tension Parallel to Grain "F t " Horizontal Shear "F v " Compression Perpendicular to Grain.
Compression Parallel to Grain "F c " Modulus of Engineering Book Store Engineering Forum Excel App. Maximum Floor Joist Span - No.
1 and No. 2 Grade of Douglas fir and maximum span floor joists - imperial units Nails and Spikes - Withdrawal Force - Allowable withdrawal load for nail and spikes Softwood and Hardwood - Structural Strength Classes - Strength classes, bending stress and mean density of hardwood and softwood.
ity of the grain around the knot is interrupted by the sawing process. In general, knots have a greater effect on strength in tension than compression; in bending, the effect depends on whether a knot is in the tension or compression side of a beam (knots along the File Size: KB.
Douglas Fir is North America’s most plentiful softwood species, accounting for one fifth of the continent’s total softwood reserves The wood of Douglas-fir varies widely in weight and strength. When lumber of high strength is needed for structural uses, selection can be improved by applying the density rule.
The ultimate bending strength of loblolly pine and Douglas fir are reached at an average stress of and lb/in 2, respectively. In contrast to tension parallel to grain, wood is very weak in tension perpendicular to grain. Compressive stress perpendicular to grain—Reported as stress at proportional limit.
There is no clearly defined ulti-mate stress for this property. Shear strength parallel to grain—Ability to resist internal slipping of one part upon another along the grain.
Values presented are average strength in radial and tangential shear by: Moisture content influence compressive (parallel to grain) strength of Red Spruce, Longleaf Pine and Douglas Fir: Indicated strengths are relative to wood containing 2% moisture.
Red Spruce - air dried: 14% moisture content, kiln dried: 6% moisture content; Longleaf Pine. Tension Parallel to Grain Ft Compression Parallel to Grain Fc Horizontal Shear Fv Compression Perp. To Grain ⊥ Modulus of Elasticity E* ** Use these factors only when moisture content will exceed 19% in use.
* When size adjusted bending values do not exceed psi a factor of may be used. Evaluation of Maximum Strength and Modulus of Elasticity of Douglas-Fir Lumber in Axial to Grain Tension by Two Nondestructive Techniques Article (PDF Available) April with Reads.
example, the basic stress of Douglas-fir is 1, pounds per square inch parallel to the grain and pounds perpendicular to the grain, while for oak these respective values are 1, and The safe load on a 1-inch bolt in a 6-inch Douglas-fir timber is 5, pounds parallel to the grain and 2, pounds perpendicular to the grain.B C namic flexure, static tension parallel to the 1 1.
Sl>cci1nc,l1 gcometrics: A-lxam for dy- grain, and static colllpression parallel to the nali~ic flesnral \~ibratio~~, R-co~lverted lo member grain, ~~~t specimens are shown in ~i~. 1.
for tc.~isile te\ting by addition of reinforcement,Cited by: 5.Douglas fir, widely traded as a commodity in a veneer form, supports a large plywood industry. An active reforestation effort with this species has meant that a significant portion of the market is in second-growth trees that range from 20 to 30 in.
in Size: 8MB.