ASTM D6555-03

Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies

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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2003
• Technical Committee: D07 - Wood
• Drafting Committee: D07.05 - Wood Assemblies

Relations

• Replaces: ASTM D6555-00a - Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies
• Effective Date: 01-Oct-2003
• Replaced By: ASTM D6555-03(2008) - Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies
• Effective Date: 01-Aug-2008
• Referred By: ASTM D7381-07(2021)e1 - Standard Practice for Establishing Allowable Stresses for Round Timbers for Piles from Tests of Full-Size Material
• Effective Date: 01-Oct-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6555–03
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 (e) 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 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This guide identifies variables to consider when evalu-
responsibility of the user of this standard to establish appro-
ating repetitive-member assembly performance for parallel
priate safety and health practices and determine the applica-
framing systems.
bility of regulatory limitations prior to use.
1.2 This guide defines terms commonly used to describe
interaction mechanisms.
2. Referenced Documents
1.3 This guide discusses general approaches to quantifying
2
2.1 ASTM Standards:
an assembly adjustment including limitations of methods and
D 245 Practice for Establishing Structural Grades and Re-
materials when evaluating repetitive-member assembly perfor-
lated Allowable Properties for Visually Graded Lumber
mance.
D 1990 Practice for Establishing Allowable Properties for
1.4 This guide does not detail the techniques for modeling
Visually-Graded Dimension Lumber from In-Grade Tests
or testing repetitive-member assembly performance.
of Full-Size Specimens
1.5 The analysis and discussion presented in this guideline
D 2915 Practice for Evaluating Allowable Properties for
arebasedontheassumptionthatameansexistsfordistributing
Grades of Structural Lumber
applied loads among adjacent, parallel supporting members of
the system.
1.6 Evaluation of creep effects is beyond the scope of this
guide.
1 2
This guide is under the jurisdiction of ASTM Committee D07 on Wood and is For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the direct responsibility of Subcommittee D07.05 on Wood Assemblies. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Current edition approved Oct. 1, 2003. Published November 2003. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 2000. Last previous edition approved in 2000 as D 6555 – 00a. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6555–03
NOTE 1—Enhanced assembly performance due to intentional overde-
D 5055 Specification for Establishing and Monitoring
sign or the contribution of elements not considered in the design are
Structural Capacities of Prefabricated Wood I-Joists
beyond the scope of this guide.
3. Terminology
5. Load-Sharing
3.1 Definitions:
5.1 Explanation of Load-Sharing:
3.1.1 composite action, n—interaction of two or more
5.1.1 Load sharing reduces apparent stiffness variability of
connected wood members that increases the effective section
memberswithinagivenassembly.Ingeneral,memberstiffness
properties over that determined for the individual members.
variabilityresultsinadistributionofloadthatincreasesloadon
3.1.2 element, n—a discrete physi
...