ASTM D6513-21

Standard Practice for Calculating the Superimposed Load on Wood-frame Walls for Standard Fire-Resistance Tests

SIGNIFICANCE AND USE
4.1 Test Methods E119 and E1529, and other standard fire resistance test methods specify that throughout exposures to fire and the hose stream, a constant superimposed axial load be applied to a load-bearing test specimen to simulate a maximum load condition. These test methods specify that this superimposed load shall be as nearly as practicable the maximum allowable axial design load allowed by design under nationally recognized structural design criteria. For this practice, the nationally recognized structural design criteria is the National Design Specification (NDS) for Wood Construction  
4.1.1 Alternatively, the standard fire resistance test methods shall be conducted by applying an axial load that is less than the maximum allowable axial design load as addressed by the NDS and this practice, but these tests shall be identified in the test report as being conducted under restricted load conditions.  
4.1.2 The superimposed axial load, as well as the superimposed axial load as a percentage of the maximum allowable axial design load for the stud and as a percentage of the maximum allowable design load for the plate, shall be calculated using the Allowable Stress Design (ASD) method in the NDS and this practice shall be included in the test report.
Note 1: The NDS should be used to ensure calculation of the superimposed load is in compliance with all applicable provisions of that document. Appendix X1 describes how to calculate the superimposed load in accordance with the NDS.  
4.2 This practice describes procedures for calculating the superimposed axial load to be applied in standard fire resistance tests of wood-frame wall assemblies.  
4.3 Statements in either the fire resistance test method standard or the nationally recognized structural design standard supersede any procedures described by this practice.
SCOPE
1.1 This practice covers procedures for calculating the superimposed axial load required to be applied to load-bearing wood-frame walls throughout standard fire-resistance and fire and hose-stream tests.  
1.2 The calculations determine the maximum load allowed by design for wood-frame wall assemblies under nationally recognized structural design criteria.  
1.3 This practice is only applicable to those wood-frame assemblies for which the nationally recognized structural design criteria are contained in the National Design Specification for Wood Construction (NDS).2  
1.4 The system of units to be used is that of the nationally recognized structural design criteria. For the NDS, the units are inch-pound.  
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Jun-2021
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• ICS: 91.060.10 - Walls. Partitions. Facades
• Technical Committee: D07 - Wood
• Drafting Committee: D07.05 - Wood Assemblies

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6513 − 21
Standard Practice for
Calculating the Superimposed Load on Wood-frame Walls
1
for Standard Fire-Resistance Tests
This standard is issued under the fixed designation D6513; 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.
1. Scope 2. Referenced Documents
3
2.1 ASTM Standards:
1.1 This practice covers procedures for calculating the
superimposed axial load required to be applied to load-bearing D9Terminology Relating to Wood and Wood-Based Prod-
ucts
wood-frame walls throughout standard fire-resistance and fire
and hose-stream tests. E119Test Methods for Fire Tests of Building Construction
and Materials
1.2 The calculations determine the maximum load allowed
E176Terminology of Fire Standards
by design for wood-frame wall assemblies under nationally
E1529Test Methods for Determining Effects of Large Hy-
recognized structural design criteria.
drocarbon Pool Fires on Structural Members and Assem-
1.3 This practice is only applicable to those wood-frame
blies
assemblies for which the nationally recognized structural
2
2.2 Other Standards:
design criteria are contained in the National Design Specifica-
ANSI/AWC–2018National Design Specification (NDS) for
2
tion for Wood Construction (NDS).
Wood Construction
1.4 The system of units to be used is that of the nationally
NDS SupplementDesign Values for Wood Construction
recognizedstructuraldesigncriteria.FortheNDS,theunitsare
inch-pound.
3. Terminology
1.5 The text of this standard references notes and footnotes
3.1 Definitions—Definitions used in this practice are in
whichprovideexplanatorymaterial.Thesenotesandfootnotes accordance with Terminology D9 and Terminology E176,
(excluding those in tables and figures) shall not be considered
unless otherwise indicated.
as requirements of the standard.
3.2 Definitions of Terms Specific to This Standard:
1.6 This standard does not purport to address all of the
3.2.1 effective column length, n—unbraced length of the
safety concerns, if any, associated with its use. It is the
vertical member, adjusted for end conditions.
responsibility of the user of this standard to establish appro-
3.2.2 gross cross-sectional area, n—area of cross section
priate safety, health, and environmental practices and deter-
calculated from overall actual dimensions of member.
mine the applicability of regulatory limitations prior to use.
3.2.2.1 Discussion—For lumber, gross cross-sectional area
1.7 This international standard was developed in accor-
isbasedonthestandarddressedsizeofthememberasgivenin
dance with internationally recognized principles on standard-
the NDS Supplement for the nominal size member.
ization established in the Decision on Principles for the
3.2.3 net section area, n—areaofcrosssectioncalculatedby
Development of International Standards, Guides and Recom-
deductingfromthegrosscross-sectionalareatheprojectedarea
mendations issued by the World Trade Organization Technical
of all materials removed by boring, grooving, dapping,
Barriers to Trade (TBT) Committee.
notching, or other means.
3.2.3.1 Discussion—For nailed or screwed connections, the
net section area equals the gross cross-sectional area.
1
This practice is under the jurisdiction ofASTM Committee D07 on Wood and
is the direct responsibility of Subcommittee D07.05 on Wood Assemblies.
Current edition approved July 1, 2021. Published August 2021. Originally
3
approved in 2000. Last previous edition approved in 2014 as D6513–14. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/D6513-21. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
2
Available from American Wood Council, 222 Catoctin Circle SE, Suite 201, Standards volume information, refer to the standard’s Document Summary page on
Leesburg, VA 20175 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6513 − 21
3.2.4 superimposed load, n—additional external load 6.1.2 Compression perpendicular to grain, F , is multi-
C'
needed to be applied to the assembly during the test to achieve plied by C , C, C and C .
M t i b
therequiredstresseswithintheassemblyafteranydeadloadof
6.1.3 Compressionparalleltothegrain, F ,ismultipliedby
C
the assembly itself is accounted for in the calculations.
C , C ,C,C ,C, and C .
D M t F i P
6.1.4 Modulusofelasticity,E ,
...

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. 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: D6513 − 14 D6513 − 21
Standard Practice for
Calculating the Superimposed Load on Wood-frame Walls
1
for Standard Fire-Resistance Tests
This standard is issued under the fixed designation D6513; 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.
1. Scope
1.1 This practice covers procedures for calculating the superimposed axial load required to be applied to load-bearing wood-frame
walls throughout standard fire-resistance and fire and hose-stream tests.
1.2 The calculations determine the maximum load allowed by design for wood-frame wall assemblies under nationally recognized
structural design criteria.
1.3 This practice is only applicable to those wood-frame assemblies for which the nationally recognized structural design criteria
2
is are contained in the National Design Specification for Wood Construction (NDS).
1.4 The system of units to be used is that of the nationally recognized structural design criteria. For the NDS, the units are
inch-pound.
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.6 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D9 Terminology Relating to Wood and Wood-Based Products
E119 Test Methods for Fire Tests of Building Construction and Materials
E176 Terminology of Fire Standards
E1529 Test Methods for Determining Effects of Large Hydrocarbon Pool Fires on Structural Members and Assemblies
1
This practice 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. 1, 2014July 1, 2021. Published November 2014August 2021. Originally approved in 2000. Last previous edition approved in 20082014 as
D6513 – 08.D6513 – 14. DOI: 10.1520/D6513-14.10.1520/D6513-21.
2
Available from American Forest & Paper Association, American Wood Council, 1111 19th Street, NW, Suite 800, Washington, DC 20036Wood Council, 222 Catoctin
Circle SE, Suite 201, Leesburg, VA 20175
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6513 − 21
2
2.2 Other Standards:
NDSANSI/AWC–2018—National Design Specification for Wood Construction National Design Specification (NDS) for Wood
Construction
NDS Supplement—Design Values for Wood Construction Design Values for Wood Construction
3. Terminology
3.1 Definitions—Definitions used in this practice are in accordance with Terminology D9 and Terminology E176, unless otherwise
indicated.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 effective column length, n—unbraced length of the vertical member, adjusted for end conditions.
3.2.2 gross cross-sectional area, n—section area area of cross section calculated from overall actual dimensions of member.
3.2.2.1 Discussion—
For lumber, gross cross-sectional area is based on the standard dressed size of the member as given in the NDS Supplement for
the nominal size member.
3.2.3 net section area, n—section area area of cross section calculated by deducting from the gross sectioncross-sectional area the
projected area of all materials removed by boring, grooving, dapping, notching, or other means.
3.2.3.1 Discussion—
For nailed or screwed connections, the net section area equals the g
...