ASTM D7381 - 07(2013)

    Standard Practice for Establishing Allowable Stresses for Round Timbers for Piles from Tests of Full-Size Material

    Active Standard ASTM D7381 | Developed by Subcommittee: D07.04

    Book of Standards Volume: 04.10


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    Significance and Use

    4.1 This practice is primarily intended for use by associations, third-party grading agencies, technical societies and other groups that develop national design standards and use recommendations for round timber piles.

    4.2 This practice provides procedures for establishing compression parallel to grain and bending stresses for round timber piles including: sampling of material for testing; methods of test and property calculation procedures; distribution analysis of test data; procedures for determining adjustments for critical section location; pile oversize, load sharing and treatment; and procedures for deriving allowable stresses.

    4.3 In using allowable stresses established under this practice, factors specific to each end use which may affect the performance of the pile system shall be considered by the designer. Such factors include the location of the critical section, the bearing capacity of the soil, the ability of the pile to withstand driving forces, the properties of the cap or load distributive element tying piles together and the loading and conditions of service.

    1. Scope

    1.1 This practice contains procedures for establishing allowable compression parallel to grain and bending stresses for round timbers used for piling, based on results from full-size tests.

    Note 1Allowable stresses for compression perpendicular to grain and shear properties are established in accordance with the provisions of Practice D2899.

    1.2 Stresses established under this practice are applicable to piles conforming to the size, quality, straightness, spiral grain, knot, shake and split provisions of Specification D25.

    1.3 A commentary on the practice is available from ASTM International.

    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D25 Specification for Round Timber Piles

    D198 Test Methods of Static Tests of Lumber in Structural Sizes

    D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber

    D1036 Test Methods of Static Tests of Wood Poles

    D1990 Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens

    D2555 Practice for Establishing Clear Wood Strength Values

    D2899 Practice for Establishing Allowable Stresses for Round Timber Piles

    D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products

    D4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material

    D6555 Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies


    ICS Code

    ICS Number Code 79.040 (Wood, sawlogs and sawn timber)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D7381-07R13

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