ASTM D6513-00(2005)
(Practice)Standard Practice for Calculating the Superimposed Load on Wood-frame Walls for Standard Fire-Endurance Tests
Standard Practice for Calculating the Superimposed Load on Wood-frame Walls for Standard Fire-Endurance Tests
SIGNIFICANCE AND USE
Test Methods E 119 and E 1529, and other standard fire endurance 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. They specify that this superimposed load shall be as nearly as practicable the maximum load allowed by design under nationally recognized structural design criteria. For this practice, the nationally recognized structural design criteria is the National Design Specification for Wood Construction (NDS).
4.1.1 Alternatively, the standard fire endurance test methods shall be conducted by applying an axial load that is less than the maximum allowable axial 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. The superimposed axial load, as well as the superimposed axial load as a percentage of the maximum allowable axial design load as addressed by the NDS and this practice shall be included in the test report.
This practice describes procedures for calculating the superimposed axial load to be applied in standard fire endurance tests of wood-frame wall assemblies.
Statements in either the fire endurance test method standard or the nationally recognized structural design standard supercede any procedures described by this practice.
The NDS shall be consulted to ensure calculations are in compliance with all applicable provisions of that document.
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-endurance 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 is 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6513–00 (Reapproved 2005)
Standard Practice for
Calculating the Superimposed Load on Wood-frame Walls
for Standard Fire-Endurance Tests
This standard is issued under the fixed designation D 6513; 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.
1. Scope E 1529 Test Methods for Determining Effects of Large
Hydrocarbon Pool Fires on Structural Members and As-
1.1 This practice covers procedures for calculating the
semblies
superimposed axial load required to be applied to load-bearing
2.2 Other Standards:
wood-frame walls throughout standard fire-endurance and fire
NDS—National Design Specification for Wood Construc-
and hose-stream tests.
tion
1.2 The calculations determine the maximum load allowed
NDS Supplement—Design Values for Wood Construction
by design for wood-frame wall assemblies under nationally
recognized structural design criteria.
3. Terminology
1.3 This practice is only applicable to those wood-frame
3.1 Definitions—Definitions used in this practice are in
assemblies for which the nationally recognized structural
accordance with Terminology D9 and Terminology E 176,
design criteria is the National Design Specification for Wood
unless otherwise indicated.
Construction (NDS).
3.2 Definitions of Terms Specific to This Standard:
1.4 The system of units to be used is that of the nationally
3.2.1 gross area, n—section area calculated from overall
recognizedstructuraldesigncriteria.FortheNDS,theunitsare
actual dimensions of member.
inch-pound.
3.2.2 net section area, n—sectionareacalculatedbydeduct-
1.5 The text of this standard references notes and footnotes
ing from the gross section area the projected area of all
which provide explanatory material. These notes and footnotes
materials removed by boring, grooving, dapping, notching, or
(excluding those in tables and figures) shall not be considered
other means.
as requirements of the standard.
3.2.3 superimposed load, n—The additional external load
1.6 This standard does not purport to address all of the
needed to be applied to the assembly to result in the calculated
safety concerns, if any, associated with its use. It is the
stresses within the assembly when any dead load of the
responsibility of the user of this standard to establish appro-
assembly itself is accounted for in the calculations.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents 4.1 Test MethodsE119 and E 1529, and other standard fire
3 endurance test methods specify that throughout exposures to
2.1 ASTM Standards:
fire and the hose stream, a constant superimposed axial load be
D9 Terminology Relating to Wood
applied to a load-bearing test specimen to simulate a maximum
E119 Test Methods for Fire Tests of Building Construction
load condition. They specify that this superimposed load shall
and Materials
be as nearly as practicable the maximum load allowed by
E 176 Terminology Relating to Fire Standards
design under nationally recognized structural design criteria.
For this practice, the nationally recognized structural design
criteria is the National Design Specification for Wood Con-
This practice is under the jurisdiction of ASTM Committee D07 on Wood and
is the direct responsibility of Subcommittee D07.07 on Fire Performance of Wood struction (NDS).
Products.
4.1.1 Alternatively, the standard fire endurance test methods
Current edition approved Oct. 1, 2005. Published October 2005. Originally
shall be conducted by applying an axial load that is less than
approved in 2000. Last previous edition approved in 2000 as D 6513 – 00.
the maximum allowable axial load as addressed by the NDS
Available from American Forest & Paper Association, American Wood Coun-
cil, 1111 19th Street, NW, Suite 800, Washington, DC 20036
and this practice, but these tests shall be identified in the test
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
report as being conducted under restricted load conditions.The
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
superimposed axial load, as well as the superimposed axial
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. load as a percentage of the maximum allowable axial design
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6513–00 (2005)
load as addressed by the NDS and this practice shall be 6.2.7 Column stability factor, C .
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included in the test report. 6.2.7.1 Buckling of compression member in plane of wall is
4.2 This practice describes procedures for calculating the prevented by the sheathing which normally provides support
superimposed axial load to be applied in standard fire endur- throughout its length and C equals 1.
P
ance tests of wood-frame wall assemblies. 6.2.7.2 For buckling of compression member perpendicular
4.3 Statements in either the fire endurance test method to plane of wall, C depends on the slenderness ratio of the
P
standardorthenationallyrecognizedstructuraldesignstandard columns. The equation for C is given in the NDS. The
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supercede any procedures described by this practice. effectivecolumnlengthshallbetheactuallengthofthevertical
4.4 TheNDSshallbeconsultedtoensurecalculationsarein member for calculating the slenderness ratio and C .
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compliance with all applicable provisions of that document. 6.2.8 Buckling stiffness factor, C , is 1.0.
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