ASTM D6555-2003(2014) 6406 Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies《木制反复使用组件的系统效果评定的标准指南》.pdf
《ASTM D6555-2003(2014) 6406 Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies《木制反复使用组件的系统效果评定的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6555-2003(2014) 6406 Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies《木制反复使用组件的系统效果评定的标准指南》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D6555 03 (Reapproved 2014)Standard Guide forEvaluating System Effects in Repetitive-Member WoodAssemblies1This standard is issued under the fixed designation D6555; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear 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.INTRODUCTIONThe apparent stiffness and strength of repetitive-member wood assemblies is generally greater thanthe stiffness
3、 and strength of the members in the assembly acting alone. The enhanced performance isa result of load sharing, partial composite action, and residual capacity obtained through the joiningof members with sheathing or cladding, or by connections directly. The contributions of these effectsare quantif
4、ied by comparing the response of a particular assembly under an applied load to theresponse of the members of the assembly under the same load.This guide defines the individual effectsresponsible for enhanced repetitive-member performance and provides general information on thevariables that should
5、be considered in the evaluation of the magnitude of such performance.The influence of load sharing, composite action, and residual capacity on assembly performancevaries with assembly configuration and individual member properties, as well as other variables. Therelationship between such variables a
6、nd the effects of load sharing and composite action is discussedin engineering literature. Consensus committees have recognized design stress increases forassemblies based on the contribution of these effects individually or on their combined effect.The development of a standardized approach to reco
7、gnize “system effects” in the design ofrepetitive-member assemblies requires standardized analyses of the effects of assembly constructionand performance.1. Scope1.1 This guide identifies variables to consider when evalu-ating repetitive-member assembly performance for parallelframing systems.1.2 Th
8、is guide defines terms commonly used to describeinteraction mechanisms.1.3 This guide discusses general approaches to quantifyingan assembly adjustment including limitations of methods andmaterials when evaluating repetitive-member assembly perfor-mance.1.4 This guide does not detail the techniques
9、for modelingor testing repetitive-member assembly performance.1.5 The analysis and discussion presented in this guidelineare based on the assumption that a means exists for distributingapplied loads among adjacent, parallel supporting members ofthe system.1.6 Evaluation of creep effects is beyond th
10、e scope of thisguide.1.7 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 and health practices and determine the applica-bility of regulatory limitations prior t
11、o use.2. Referenced Documents2.1 ASTM Standards:2D245 Practice for Establishing Structural Grades and Re-lated Allowable Properties for Visually Graded LumberD1990 Practice for Establishing Allowable Properties forVisually-Graded Dimension Lumber from In-Grade Testsof Full-Size SpecimensD2915 Practi
12、ce for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD5055 Specification for Establishing and Monitoring Struc-tural Capacities of Prefabricated Wood I-Joists1This guide is under the jurisdiction of ASTM Committee D07 on Wood and isthe direct responsibility of Subcommittee D
13、07.05 on Wood Assemblies.Current edition approved Aug. 1, 2014. Published August 2014. Originallyapproved in 2000. Last previous edition approved in 2008 as D6555 03 (2008).DOI: 10.1520/D6555-03R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service
14、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 States13. Terminology3.1 Definitions:3.1.1 composite act
15、ion, ninteraction of two or more con-nected wood members that increases the effective sectionproperties over that determined for the individual members.3.1.2 element, na discrete physical piece of a membersuch as a truss chord.3.1.3 global correlation, ncorrelation of member proper-ties based on ana
16、lysis of property data representative of thespecies or species group for a large defined area or regionrather than mill-by-mill or lot-by-lot data. The area representedmay be defined by political, ecological, or other boundaries.3.1.4 load sharing, ndistribution of load among adjacent,parallel membe
17、rs in proportion to relative member stiffness.3.1.5 member, na structural wood element or elementssuch as studs, joists, rafters, tresses, that carry load directly toassembly supports. A member may consist of one element ormultiple elements.3.1.6 parallel framing system, na system of parallel fram-i
18、ng members.3.1.7 repetitive-member wood assembly, na system inwhich three or more members are joined using a transverseload-distributing element.3.1.7.1 DiscussionException: Two-ply assemblies can beconsidered repetitive-member assemblies when the membersare in direct side-by-side contact and are jo
19、ined together bymechanical connections or adhesives, or both, to distributeload.3.1.8 residual capacity, nratio of the maximum assemblycapacity to the assembly capacity at first failure of an indi-vidual member or connection.3.1.9 sheathing gaps, ninterruptions in the continuity of aload-distributin
20、g element such as joints in sheathing or deck-ing.3.1.10 transverse load-distributing elements, nstructuralcomponents such as sheathing, siding and decking that supportand distribute load to members. Other components such ascross bridging, solid blocking, distributed ceiling strapping,strongbacks, a
21、nd connection systems may also distribute loadamong members.4. Significance and Use4.1 This guide covers variables to be considered in theevaluation of the performance of repetitive-member woodassemblies. System performance is attributable to one or moreof the following effects:4.1.1 Load sharing,4.
22、1.2 Composite action, or4.1.3 Residual capacity.4.2 This guide is intended for use where design stressadjustments for repetitive-member assemblies are being devel-oped.4.3 This guide serves as a basis to evaluate design stressadjustments developed using analytical or empirical proce-dures.NOTE 1Enha
23、nced assembly performance due to intentional overde-sign or the contribution of elements not considered in the design arebeyond the scope of this guide.5. Load Sharing5.1 Explanation of Load Sharing:5.1.1 Load sharing reduces apparent stiffness variability ofmembers within a given assembly. In gener
24、al, member stiffnessvariability results in a distribution of load that increases load onstiffer members and reduces load on more flexible members.5.1.2 A positive strength-stiffness correlation for membersresults in load sharing increases, which give the appearance ofhigher strength for minimum stre
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