1、Designation: D5055 131D5055 16Standard Specification forEstablishing and Monitoring Structural Capacities ofPrefabricated Wood I-Joists1This standard is issued under the fixed designation D5055; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f 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.1 NOTETable 1 was changed editorially in June 2013.1. Scope1.1 GeneralThis specification gives procedures
3、for establishing, monitoring, and reevaluating structural capacities ofprefabricated wood I-joists. Capacities considered are shear, reaction, moment, and stiffness. Procedures for establishing commondetails are given and certain design considerations specific to wood I-joists are itemized.1.2 Conte
4、nts of the StandardAn index and brief description of the main features of this specification are given inX1.1.1X2.1.1.1.3 Development of the StandardThe development and intent of this specification is discussed in Appendix X1X2.1.4 The values stated in inch-pound units are to be regarded as standard
5、. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this stan
6、dard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. A specific precautionary statement is given in 6.1.1.5.2. Referenced Documents2.1 ASTM Standards:2D198 Test Methods of Static Tests of Lumber in Structural SizesD245 Pract
7、ice for Establishing Structural Grades and Related Allowable Properties for Visually Graded LumberD1990 Practice for EstablishingAllowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-SizeSpecimensD2559 Specification for Adhesives for Bonded Structural Wood Products fo
8、r Use Under Exterior Exposure ConditionsD2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based ProductsD4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural MaterialD5456 Specification for Evaluation of Structural Composite Lumber ProductsD5457 Spe
9、cification for Computing Reference Resistance of Wood-Based Materials and Structural Connections for Load andResistance Factor DesignD7247 Test Method for Evaluating the Shear Strength of Adhesive Bonds in Laminated Wood Products at ElevatedTemperaturesD7480 Guide for Evaluating the Attributes of a
10、Forest Management PlanE4 Practices for Force Verification of Testing MachinesE529 Guide for Conducting Flexural Tests on Beams and Girders for Building ConstructionE699 Practice for Evaluation of Agencies Involved in Testing, Quality Assurance, and Evaluating of Building ComponentsIEEE/ASTM SI 10IEE
11、E/ASTM SI 10 Standard for Use of the International System of Units (SI): The Modern Metric System1 This specification is under the jurisdiction ofASTM Committee D07 on Wood and is the direct responsibility of Subcommittee D07.02 on Lumber and Engineered WoodProducts.Current edition approved April 1,
12、 2013June 1, 2016. Published April 2013June 2016. Originally approved in 1990. Last previous edition approved in 20122013 asD5055 12.D505513. DOI: 10.1520/D5055-13.10.1520/D5055-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org
13、. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit m
14、ay not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Har
15、bor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12.2 U.S. Product Standards:3PS-1 Structural PlywoodPS-2 Performance Standard for Wood-Based Structural-Use PanelsPS-20 American Softwood Lumber Standard2.3 Other Standards:CSA O86 CSA O86 Engineering Design in Wood4CSA Standards
16、 for Wood Adhesives CSA Standards for Wood Adhesives O112 Series4CSA O121CSA O121 Douglas-fir Plywood4CSA O141CSA O141 Softwood Lumber4CSA O151 CSA O151 Canadian Softwood Plywood4CSA O325CSA O325 Construction Sheathing4CSA O437.0CSA O437.0 OSB and Waferboard4Lumber Grading Rules Approved by American
17、 Lumber Standards Committee (ALSC) or Canadian Lumber StandardsAccreditation Board (CLSAB)5SPS-1 Fingerjoined Structural Lumber6SPS-4 Fingerjointed Flange Stock Lumber, 20016ISO/IEC 17020 General Criteria for the Operation of Various Types of Bodies Performing Inspection7ISO/IEC 17025 General Requir
18、ements for the Competence of Testing and Calibration Laboratories7ISO/IEC 17065 Conformity AssessmentRequirements for Bodies Certifying Products, Processes and Services73. Terminology3.1 Definitions:3.1.1 prefabricated wood I-joista structural member manufactured using sawn or structural composite l
19、umber flanges andstructural panel webs, bonded together with exterior exposure adhesives, forming an “I” cross-sectional shape. These members areprimarily used as joists in floor and roof construction.3.2 Definitions of Terms Specific to This Standard:3.2.1 capacity (or structural capacity)the numer
20、ic result of certain calculations specified in this specification.3.2.2 design valuethe numeric value claimed by the manufacturer as appropriate for use in structural analysis.NOTE 1A brief discussion of this issue is found in X1.9X2.9.3.2.3 structural composite lumbera composite of wood elements (f
21、or example, wood strands, strips, veneer sheets, or acombination thereof), bonded with an exterior grade adhesive and intended for structural use in dry service conditions.4. Design Considerations4.1 Design Value Adjustments:4.1.1 Duration of LoadWith the exception of reaction design values limited
22、by compression perpendicular to grain,prefabricated wood I-joists shall be designed using the strength adjustment for load duration used in sawn lumber. This adjustmentis determined in accordance with the section on Duration of Load Under Modification of Allowable Properties for Design Use inPractic
23、e D245.4.1.2 Repetitive MembersThe repetitive member factor for prefabricated I-joists shall be taken as 1.0.NOTE 2Committee D07 chose to reduce the repetitive member factor to unity primarily for purposes of design simplicity.Adiscussion of this decisionis given in Appendix X1X2.4.1.3 TreatmentsSom
24、e pressure treatments affect material strength and the quality of prefabricated wood I-joists. TreatedI-joists shall not be used without evaluation of such effects.4.1.4 EnvironmentThe capacities developed in this specification are applicable to joists used under dry conditions such as inmost covere
25、d structures. Appropriate adjustments for uses in other environments shall be made.4.2 Shear Design:4.2.1 Neglecting loads within a distance from the support equal to the depth of the member shall not be permitted.4.2.2 Adjustments to the shear design value near the support or at locations of contin
26、uity or where reinforcements are providedmust be substantiated by independent testing to the general intended criteria for shear capacity herein.3 Available from APAThe Engineered Wood Association, 7011 South 19th Street, Tacoma, WA 98466, http:/www.apawood.org; and TECO, 2902 Terra Court, SunPrairi
27、e, WI 53590, http:/.4 Available from Canadian Standards Association (CSA), 5060 Spectrum Way, Mississauga, ON L4W 5N6, Canada, http:/www.csa.ca.5 Available from American Lumber Standard Committee (ALSC), P.O. Box 210, Germantown, MD 20874, http:/www.alsc.org; and Canadian Lumber StandardsAccreditati
28、on Board (CLSAB), 960 Quayside Drive, Suite 406, New Westminster, BC V3M 6G2, Canada, http:/www.clsab.ca.6 Available from National Lumber Grades Authority (NLGA), 302960 Quayside Drive, New Westminster, BC V3M 6G2, Canada, http:/www.nlga.org.7 Available from International Organization for Standardiz
29、ation (ISO), 1, ch. de la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http:/www.iso.org.D5055 1625. Materials5.1 GeneralThe following I-joist components meet the definition of a biobased product in accordance with 3.3.1 of GuideD7480:5.1.1 Lumber flange materials complying with USDOC PS-20,
30、CSA O141, CSA O141, NLGA SPS-1, or NLGA SPS-4.5.1.2 Structural composite lumber flange materials complying with Specification D5456.5.1.3 Web materials complying with USDOC PS-1, USDOC PS-2, CSA O121, CSA O151, CSA O325, or CSA O437.0.5.2 Flange Stock:5.2.1 All flange material shall conform to the r
31、equirements of 6.4. In addition, when the flange material is structural compositelumber, the following properties shall be determined in accordance with Specification D5456: modulus of elasticity (flat or edge,depending on flange orientation in the I-joist), compression (parallel and perpendicular t
32、o grain), and nail design values.5.2.2 End joints in purchased flange stock are permitted provided such joints conform to the general intent and Section 10 ofthis specification.5.3 Web MaterialPanels shall conform to manufacturing or performance standards recognized by the applicable governingcode.
33、Examples are PS-1 (or CSA O151) CSA O151) and PS-2 (or CSA O325). CSA O325). In addition, all panels shall meet theequivalent of Exposure I requirements as specified in PS-1 or PS-2.5.4 AdhesivesAdhesives used to bond together components of the finished product shall conform to the requirements inSp
34、ecification D2559 (or, in Canada, shall conform to an appropriate standard from the CSA Standards for Wood Adhesives, CSAStandards for Wood Adhesives, O112 Series, stipulated in CSA O86). CSA O86). In addition, adhesives used for web-to-web,web-to-flange, and flange-to-flange joints shall be qualifi
35、ed for heat durability performance in accordance with 5.4.3. AppendixX3X4 gives additional information and standards that shall be considered when qualifying adhesives and adhesive-bondedmaterials.NOTE 3Heat durable performance implies that a bonded joint will exhibit similar material resistance to
36、solid wood in an elevated temperatureenvironment where the wood material surrounding the joint does not provide thermal protection.5.4.1 Adhesives and binder systems used in the fabrication of Structural Composite Lumber products shall be evaluated inaccordance with Specification D5456.5.4.2 Adhesiv
37、es and binder systems used in the fabrication of panel products used as a web shall be evaluated in accordancewith PS-2 (or, in Canada, CSA O325) CSA O325) with the Exposure 1 classification.5.4.3 AdhesivesHeat durability:5.4.3.1 Adhesives used for web-to-web, web-to-flange, and flange-to-flange joi
38、nts shall be qualified for heat durabilityperformance through testing in accordance with Test Method D7247. The test temperature and heat exposure duration forspecimens tested at elevated temperature (7.2 of Test Method D7247) shall meet the requirements of Items 1, 2, 3, and 4 below.(1) The solid w
39、ood control specimen and both pieces of the bonded specimen shall be prepared from the same commercialspecies group of Douglas Fir, Southern Pine, or the predominate commercial species group used in the flange. The adhesiveformulation used in the test shall be the same as the adhesive formulation us
40、ed in the production process.(2) For the bonded specimens, the minimum target bondline temperature shall be 428F (220C). For the matched solid woodcontrol specimens, the minimum target temperature at the shear plane shall be 428F (220C).(3) The minimum target temperatures of Item 2 shall be maintain
41、ed for a minimum of 10 min or until achieving a residualstrength ratio for the solid wood control specimens of 30 6 10 %, 10 %, whichever is longer.(4) Block shear testing shall be conducted immediately after removal from the oven such that the specimen bondline or shearplane temperature does not dr
42、op more than 9F (5C) after leaving the oven and prior to failure. This provision is satisfied whenthe time interval from the removal of the specimen from the oven to the failure of the block shear specimen does not exceed 60s for each specimen tested and the room temperature of the test laboratory a
43、t the time of testing is not less than 60F (15.5C).5.4.3.2 For adhesives tested in accordance with 5.4.3.1, the residual shear strength ratio for the bonded specimens, as calculatedin accordance with Test Method D7247, shall be equal to or higher than the lower 95 % 95 % confidence interval on the m
44、eanresidual shear strength ratio for the solid wood control specimens.6. Qualification6.1 GeneralThis section describes procedures, both empirical and analytic, for initial qualification of the structural capacitiesof prefabricated wood I-joists. Qualification is required for certain common details
45、of I-joist application since they often influencestructural capacities. All capacities are to be reported with three significant digits. Any time significant changes in joist orapplication details, manufacturing processes or material specifications occur, qualification is required, as for a new manu
46、factureror product line.6.1.1 TestingQualification tests shall be conducted or witnessed by a qualified agency as defined in 8.1. All test results are tobe certified by the qualified agency.6.1.1.1 Sample SizeThe number of specimens specified in 6.2, 6.3, 6.4, 6.5, and 6.6 are minimums. The producer
47、 wishing toevaluate the validity of the sample size will find a procedure in 4.7 of Practice D2915.D5055 1636.1.1.2 Test SpecimensMaterials and fabrication procedures of test specimens shall be as typical of intended production as canbe obtained at the time of manufacturing qualification specimens.
48、Minimum specimen temperature at the time of test shall be 40F(4C). Specimens shall be tested at the as-received moisture content.NOTE 4It is desirable to conduct preliminary tests to aid the selection of representative specimens.6.1.1.3 Test AccuracyTests in accordance with this specification are to
49、 be conducted in a machine or apparatus calibrated inaccordance with Practices E4 except that the percentage error shall not exceed 62.0.6.1.1.4 Test MethodsMethods generally applicable to the full-section joist tests required herein are in Guide E529, with thefollowing exceptions: (1) the methods are applicable to both qualification and quality control, (2) load rate shall be as specifiedin the following sections, and (3) delays between load increments are not required. Required tension and compression tests sha
