ASTM_D_7381_-_07_2021e1.pdf

Designation:D738107(Reapproved 2021)1Standard Practice forEstablishing Allowable Stresses for Round Timbers for Pilesfrom Tests of Full-Size Material1This standard is issued under the fixed designation D7381;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEASTM Specification E3200 and IEEE/ASTM SI-10 were added to the Referenced Documents section and edito-rial updates were made in Sections 3,10.4 and 10.5 in December 2021.1.Scope1.1 This practice contains procedures for establishing allow-able compression parallel to grain and bending stresses forround timbers used for piling,based on results from full-sizetests.NOTE1Allowable stresses for compression perpendicular to grain andshear properties are established in accordance with the provisions ofPractice D2899.1.2 Stresses established under this practice are applicable topiles 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 ASTMInternational.1.4 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD25 Specification for Round Timber PilesD198 Test Methods of Static Tests of Lumber in StructuralSizesD245 Practice for Establishing Structural Grades and Re-lated Allowable Properties for Visually Graded LumberD1036 Test Methods of Static Tests of Wood PolesD1990 Practice for Establishing Allowable Properties forVisually-Graded Dimension Lumber from In-Grade Testsof Full-Size SpecimensD2555 Practice for Establishing Clear Wood Strength ValuesD2899 Practice for Establishing Allowable Stresses forRound Timber PilesD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD3200 Specification and Test Method for Establishing Rec-ommended Design Stresses for Round Timber Construc-tion PolesD4761 Test Methods for Mechanical Properties of Lumberand Wood-Based Structural MaterialsD6555 Guide for Evaluating System Effects in Repetitive-Member Wood AssembliesIEEE/ASTM SI-10 American National Standard for MetricPractice3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D9.3.2 Definitions of Terms Specific to This Standard:3.2.1 allowable stressnumeric value of pile strength ap-propriate for use in design.3.2.2 end-bearingcompression parallel to grain stressused in design when the pile load is not carried to the soilthrough skin friction.3.2.3 load sharingdistribution of load that occurs in twoor more piles which are capped with a load-distributingelement that assures the piles deform as a group.3.2.3.1 DiscussionThe load distributed to the piles in such1This practice is under the jurisdiction of ASTM Committee D07 on Wood andis the direct responsibility of Subcommittee D07.04 on Pole and Pile Products.Current edition approved April 1,2013.Published December 2021.Originallyapproved in 2007.Last previous edition approved in 2013 as D7381 07(2013).DOI:10.1520/D7381-07R21E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?a group is in proportion to the stiffness of each pile.Thisdistribution of loads to the piles in the group reduces the effectof between pile variability and increases system reliability overthat of piles which perform as single members.3.2.4 skin frictioninteraction between the pile surface andthe surrounding soil which serves to distribute load either