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Saturday, July 25, 2020 | History

2 edition of Deriving allowable properties of lumber found in the catalog.

Deriving allowable properties of lumber

Alan Bendtsen

Deriving allowable properties of lumber

a practical guide for interpretation of ASTM standards

by Alan Bendtsen

  • 79 Want to read
  • 27 Currently reading

Published by Dept. of Agriculture, Forest Service, Forest Products Laboratory in [Madison, Wis.] .
Written in English

    Subjects:
  • Lumber -- Grading

  • Edition Notes

    Bibliography: p. 17

    Statementby Alan Bendtsen and William L. Galligan
    SeriesUSDA Forest Service general technical report FPL ; 20
    ContributionsGalligan, William L., joint author, Forest Products Laboratory (U.S.), United States. Forest Service
    The Physical Object
    Paginationii, 29 p. ;
    Number of Pages29
    ID Numbers
    Open LibraryOL14843212M

    The procedures described in this practice are intended to be used to establish allowable stress and modulus of elasticity values for solid sawn, visually graded dimension lumber from In-Grade type test data. These procedures apply to the tested and untested sizes and grades when an adequate data matrix of sizes and grades exists. In addition, the methodology for establishing allowable. In the early s, the Canadian lumber industry conducted a major research program through the Canadian Wood Council Lumber Properties Program for bending, tension and compression parallel to grain strength properties of 38 mm thick (nominal 2 in) dimension lumber of all commercially important Canadian species groups.

    Wood-Frame Shear Wall and Diaphragm Design Ricky McLain, MS, PE, SE Technical Director –WoodWorks to determine allowable unit shear capacity (ASD) or factored unit shear resistance (LRFD) geometric compatibility and both short- and long-term material properties. The assignment of names indicating the uses for the various classes of stress-graded lumber does not preclude their use for other purposes. For example, posts and timbers may give service as beams. The principles of stress grading permit the assignment of any kind of allowable properties to any of the classes of stress-graded lumber, whether graded primarily for that .

    This specification covers procedures for computing the reference resistance of wood-based materials and structural connections for use in load and resistance factor design (LRFD). The format conversion procedure is outlined in Section test-based derivation procedure is outlined in Annex reference resistance derived from this specification applies to the . Table 1B Nominal Size bxd Section Properties of Standard Dressed (S4S) Sawn Lumber 50 lb./fi.3 1 2. File Size: 2MB.


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Deriving allowable properties of lumber by Alan Bendtsen Download PDF EPUB FB2

The ASTM standards for establishing clear wood mechanical properties and for deriving structural grades and related allowable properties for visually graded lumber can be confusing and difficult for the uninitiated to interpret.

This report provides a practical guide to using these standards for individuals not familiar with their application. DERIVATION OF ALLOWABLE PROPERTIES. Allowable properties for visually graded lumber are based on clear wood properties as cataloged in D (3).

D also provides rules and procedures for developing clear wood properties of species grouped for. Allowable properties are assigned to visually graded lumber at two moisture content levels: green and 19 percent maximum con­ tent (assumed 15 percent average moisture content).Author: Roland Hernandez, David W.

Green. The relationships between lumber properties have been used extensively in deriving allowable properties for lumber. The relationship between modulus of elasticity (MOE) and modulus of rupture (MOR) forms the basis for sorting most mechanically stress-rated (MSR) lumber sold in the United States (Galligan et al.

).File Size: KB. losophy of how properties for engineering design are derived. The derived properties are then used in one of two design formats: (a) the load and resistance factor design (LRFD), which is based on a reference strength at the 5th percentile 5 File Size: KB. grading rules for west coast lumber effective september 1, revised october 1, douglas fir hem fir western red cedar spruce–pine–fir south and other softwood species published by west coast lumber inspection bureau approved by alsc board of review File Size: 1MB.

Lumber Design Values Design values provided herein are for Western softwood species manufactured and shipped by mills in the 12 contiguous Western states and Alaska.

Except as otherwise noted, the values are computed in accordance with ASTM standards based on clear-wood tests or on tests of full-size pieces in specific grades. Structural Grades and Related Allowable Properties for Visually Graded Lumber).

Methods in ASTM Standard D involve adjusting strength properties of small clear specimens of wood, as given in ASTM Standard D () (Establishing Clear Wood Strength Values), for effects of knots, slope of grain, splits, checks, size, duration.

erties to represent the average properties of a species is uncer-tain; nevertheless, the properties represent the best informa-tion available. Variability, or variation in properties, is common to all materials. Because wood is a natural material and the tree is subject to many constantly changing influences (such asFile Size: 1MB.

The following table is Structural Lumber Wood Engineering Properties. Modulus of Elasticity of Wood, Wood Engineering Design Data. Modulus of elasticity also referred to as Tensile Modulus or Young's Modulus. Elastic ratios for various wood species at approximately 12% moisture content - see bottom of webpage.

Related Lumber Wood Engineering Data: Structural Wood. Get this from a library. Deriving allowable properties of lumber: a practical guide for interpretation of ASTM standards. [B A Bendtsen; W L. This paper describes the present method of deriving allowable stresses for wood. While this method has served adequately in the past its relevance to ‘limit states design’ is questioned and several of its shortcomings are pointed alternative method of obtaining characteristic values for the strength properties of wood is by: Prior toU.S.

lumber design values were derived using the clearwood values ofASTM D (6) and the grade derivation of design values in ASTM D (3). Because the process relied on clear wood data which is generally not available for foreign species, new procedures had to be de­ veloped.

wood is accounted for in determining allowable stresses by using a load duration factor, C D. The load TAB LE Properties of Dressed Lumber Standard Size Width ¥ Depth S4S Dressed Size Width ¥ Depth Cross-Sectional Area A 2(in.) Moment of Inertia I (in. 4) Section Modulus S (in. 3) Weig ht in Pounds per Lineal Foot a 1 ¥ 4 ¾ ¥ 3 ½ File Size: KB.

Allowable Property Values - Douglas fir Prepared by West Coast Lumber Inspection Bureau 3/14/ Approved 4/25/ Grade E (psi) Douglas fir Extreme fiber in bending West Coast Lumber Inspection Bureau P.O.

Box Portland, OR ph: () fax: () email: [email protected] Fc (psi) Fv (psi) Fc┴ (psi) Fb (psi) Ft (psi. Structure of Wood Regis B. Miller Contents Bark, Wood, Branches, and Cambium 2–1 Sapwood and Heartwood 2–2 Growth Rings 2–2 Wood Cells 2–3 Chemical Composition 2–3 Species Identification 2–4 References 2–4 he fibrous nature of wood strongly influences how it is used.

Wood is primarily composed of hollow,File Size: 1MB. Wood is naturally susceptible to attack by wood-destroying fungi and termites, so with permission, from the AWPA Book of Standards (Standard U, Table ).This deSiGn pRopeRTieS Allowable Design Stresses for Beams and Columns (% Load Duration) Reaction Treated Beam Width.

Addresses the new National Design Specification for Wood Construction (NDS) Contains dual-format Allowable Stress Design/Load and Resistance Factor Design (ASD/LRFD) specifications,equations, and problems; Includes ASCE/SEI load provisions; DESIGN OF WOOD STRUCTURES--ASD/LRFD, SEVENTH EDITION, COVERS: Wood buildings and Cited by: No.

Allowable property values are for Normal Loading. Published property values are developed in accordance with ASTM standards D, D, D Published Base Values are approved by the American Lumber Standard Committee Board of Review.

Assigned Specific Gravity for all grades = 2x10 Size Adjusted Values West Coast Lumber. If wood decay is found, then the allowable properties do not apply to those areas due to the significant effect that wood decay has on allowable properties.

Wood decay can be further examined with a resistance drill or increment cores can be removed and examined microscopically.

The same applies to areas with insect on: 20 Ciferri Drive Millbrook, NY, United States. The strength of wood increases with a reduction in the moisture content. Reference design values for sawn lumber assume maximum moisture content of 19%.

Wood with a moisture content of 19% or less is considered dry. Kiln dried or seasoned wood would be considered dry as long as it hasn’t been exposed to weather long enough to cause re-saturation.A third standard is ASTM D, "Standard Practice for Establishing Allowable Properties for Visually Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens, " which outlines criteria to properly analyze data from In-Grade tests.

ASTM D applies directly to dimension lumber in sizes from 2x2 to 4x Lumber Grading Rules.Dimensional Lumber Grades.

WWPA grades for dimension lumber are established by the American Lumber Standard Committee, Inc., in accordance with DOC (U.S.

Department of Commerce) Product Standard The grading rules are published in the Western Lumber Grading Rules book. Dimension Lumber grades are divided into the following classifications.