ASTM D6555-03(2008)
(Guide)Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies
Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies
ABSTRACT
This guide identifies the variables to consider when evaluating the performance of repetitive-member wood assemblies for parallel framing systems. This guide discusses general approaches to quantifying an assembly adjustment including limitations of methods and materials when evaluating repetitive-member assembly performance, and does not address the techniques for modeling or testing of such.
SCOPE
1.1 This guide identifies variables to consider when evaluating repetitive-member assembly performance for parallel framing systems.
1.2 This guide defines terms commonly used to describe interaction mechanisms.
1.3 This guide discusses general approaches to quantifying an assembly adjustment including limitations of methods and materials when evaluating repetitive-member assembly performance.
1.4 This guide does not detail the techniques for modeling or testing repetitive-member assembly performance.
1.5 The analysis and discussion presented in this guideline are based on the assumption that a means exists for distributing applied loads among adjacent, parallel supporting members of the system.
1.6 Evaluation of creep effects is beyond the scope of this guide.
1.7 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.
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Designation: D6555 − 03(Reapproved 2008)
Standard Guide for
Evaluating System Effects in Repetitive-Member Wood
1
Assemblies
This standard is issued under the fixed designation D6555; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The apparent stiffness and strength of repetitive-member wood assemblies is generally greater than
the stiffness and strength of the members in the assembly acting alone. The enhanced performance is
a result of load sharing, partial composite action, and residual capacity obtained through the joining
of members with sheathing or cladding, or by connections directly. The contributions of these effects
are quantified by comparing the response of a particular assembly under an applied load to the
responseofthemembersoftheassemblyunderthesameload.Thisguidedefinestheindividualeffects
responsible for enhanced repetitive-member performance and provides general information on the
variables that should be considered in the evaluation of the magnitude of such performance.
The influence of load sharing, composite action, and residual capacity on assembly performance
varies with assembly configuration and individual member properties, as well as other variables. The
relationship between such variables and the effects of load sharing and composite action is discussed
in engineering literature. Consensus committees have recognized design stress increases for
assemblies based on the contribution of these effects individually or on their combined effect.
The development of a standardized approach to recognize “system effects” in the design of
repetitive-member assemblies requires standardized analyses of the effects of assembly construction
and performance.
1. Scope 1.6 Evaluation of creep effects is beyond the scope of this
guide.
1.1 This guide identifies variables to consider when evalu-
1.7 This standard does not purport to address all of the
ating repetitive-member assembly performance for parallel
safety concerns, if any, associated with its use. It is the
framing systems.
responsibility of the user of this standard to establish appro-
1.2 This guide defines terms commonly used to describe
priate safety and health practices and determine the applica-
interaction mechanisms.
bility of regulatory limitations prior to use.
1.3 This guide discusses general approaches to quantifying
2. Referenced Documents
an assembly adjustment including limitations of methods and
2
materials when evaluating repetitive-member assembly perfor-
2.1 ASTM Standards:
mance.
D245Practice for Establishing Structural Grades and Re-
lated Allowable Properties for Visually Graded Lumber
1.4 This guide does not detail the techniques for modeling
D1990Practice for Establishing Allowable Properties for
or testing repetitive-member assembly performance.
Visually-Graded Dimension Lumber from In-Grade Tests
1.5 The analysis and discussion presented in this guideline
of Full-Size Specimens
arebasedontheassumptionthatameansexistsfordistributing
D2915Practice for Sampling and Data-Analysis for Struc-
applied loads among adjacent, parallel supporting members of
tural Wood and Wood-Based Products
the system.
D5055Specification for Establishing and Monitoring Struc-
tural Capacities of Prefabricated Wood I-Joists
1
This guide is under the jurisdiction ofASTM Committee D07 on Wood and is
2
the direct responsibility of Subcommittee D07.05 on Wood Assemblies. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2008. Published August 2008. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2000. Last previous edition approved in 2003 as D6555–03. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6555-03R08. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6555 − 03 (2008)
NOTE 1—Enhanced assembly performance due to intentional overde-
3. Terminology
sign or the contribution of elements not considered in the design are
3.1 Definitions:
beyond the scope of this guide.
3.1.1 composite action, n—interaction of two or more con-
nected wood members that increases the effective section
5. Load Sharing
properties over that determined for the individual members.
5.1 Explanation of Load Sharing:
3.1.2 element, n—a discrete physical piece of a member
5.1.1 Load sharing reduces apparent stiffness variability of
such as a truss chord.
memberswithinagiven
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may 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 version
of the standard as published by ASTM is to be considered the official document.
Designation:D6555–00a
Guide for Designation:D6555–03(Reapproved 2008)
Standard Guide for
Evaluating System Effects in Repetitive-Member Wood
1
Assemblies
This standard is issued under the fixed designation D 6555; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The apparent stiffness and strength of repetitive-member wood assemblies is generally greater than
the stiffness and strength of the members in the assembly acting alone. The enhanced performance is
a result of load sharing, partial composite action, and residual capacity obtained through the joining
of members with sheathing or cladding, or by connections directly. The contributions of these effects
are quantified by comparing the response of a particular assembly under an applied load to the
responseofthemembersoftheassemblyunderthesameload.Thisguidedefinestheindividualeffects
responsible for enhanced repetitive-member performance and provides general information on the
variables that should be considered in the evaluation of the magnitude of such performance.
The influence of load sharing, composite action, and residual capacity on assembly performance
varies with assembly configuration and individual member properties, as well as other variables. The
relationship between such variables and the effects of load sharing and composite action is discussed
in engineering literature. Consensus committees have recognized design stress increases for
assemblies based on the contribution of these effects individually or on their combined effect.
The development of a standardized approach to recognize “system effects” in the design of
repetitive-member assemblies requires standardized analyses of the effects of assembly construction
and performance.
1. Scope
1.1 This guide identifies variables to consider when evaluating repetitive-member assembly performance for parallel framing
systems.
1.2 This guide defines terms commonly used to describe interaction mechanisms.
1.3 This guide discusses general approaches to quantifying an assembly adjustment including limitations of methods and
materials when evaluating repetitive-member assembly performance.
1.4 This guide does not detail the techniques for modeling or testing repetitive-member assembly performance.
1.5 The analysis and discussion presented in this guideline are based on the assumption that a means exists for distributing
applied loads among adjacent, parallel supporting members of the system.
1.6 Evaluation of creep effects is beyond the scope of this guide.
1.7 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
2
2.1 ASTM Standards:
D 245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
1
This guide is under the jurisdiction of ASTM Committee D07 on Wood and is the direct responsibility of Subcommittee D07.05 on Wood Assemblies.
Current edition approved Oct. 10, 2000. Published December 2000. Originally published as D6555–00. Last previous edition D6555–00.
Current edition approved Aug. 1, 2008. Published August 2008. Originally approved in 2000. Last previous edition approved in 2003 as D 6555 – 03.
2
Annual Book of ASTM Standards, Vol 04.10.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6555–03 (2008)
D 1990 Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of
Full-Size Specimens
D 2915 Practice for Evaluating Allowable Properties for Grades of Structural Lumber
D 5055 Specification for Establishing and Monitoring Structural Capacities of Prefabricated Wood I-Joists
3. Terminology
3.1 Definitions:
3.1.1 composite action, n—interaction of two or more connected wood members that increases the effective section properties
over that determined for the individual members.
3.1.2 element, n—a discrete physical piece of a member such as a truss chord.
3.1.3 global correlation, n—correlation of member properties based on analysis of pr
...
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