ISO 16670-2003 - Password - Removed
ISO 16670-2003 - Password - Removed
ISO 16670-2003 - Password - Removed
STANDARD 16670
First edition
2003-12-15
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mécaniques — Méthode d'essai cyclique réversible quasi statique
Reference number
ISO 16670:2003(E)
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ISO 16670:2003(E)
Contents Page
Foreword ............................................................................................................................................................ iv
Introduction ........................................................................................................................................................ v
1 Scope...................................................................................................................................................... 1
2 Normative references ........................................................................................................................... 1
3 Symbols and definitions....................................................................................................................... 1
4 Test specimens ..................................................................................................................................... 2
4.1 Conditioning .......................................................................................................................................... 2
4.2 Form and dimension............................................................................................................................. 2
4.3 Sampling ................................................................................................................................................ 2
4.4 Number of replicates ............................................................................................................................ 2
5 Apparatus............................................................................................................................................... 2
6 Test procedure ...................................................................................................................................... 2
6.1 Properties from static (monotonic) tests............................................................................................ 2
6.2 Cyclic displacement schedule ............................................................................................................. 3
7 Test results ............................................................................................................................................ 5
7.1 Hysteresis data...................................................................................................................................... 5
7.2 Envelope curves.................................................................................................................................... 5
7.3 Joint properties ..................................................................................................................................... 5
8 Test report.............................................................................................................................................. 5
Annex A (informative) Additional information ................................................................................................. 6
Bibliography ....................................................................................................................................................... 9
iii
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
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The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16670 was prepared by Technical Committee ISO/TC 165, Timber structure.
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ISO 16670:2003(E)
Introduction
Evaluation of the structural performance of joints under reversed-cyclic loading has become a requirement in
seismic design. The objective of this International Standard is to provide a cyclic test procedure as a basis for
the development of characteristics of joints for use in seismic design. The cyclic displacement schedule was
developed in consultation with a group of international experts with the intention that the cyclic displacement
schedule shall produce
a) data that sufficiently describes the elastic and inelastic properties of the joint, and
Supplementary information is given in Annex A to provide the rationale behind the cyclic displacement
schedule, recommendations for cases for which a modified schedule would be more appropriate, and typical
test results obtained on a joint by following this cyclic displacement schedule.
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1 Scope
This International Standard is intended to provide a cyclic test method as a basis for the derivation of
parameters which are required in seismic design of timber structures. The method includes procedures to
develop the envelope curves (backbone or skeleton curves; an example is given in Clause A.5.) for joints
subjected to a cyclic displacement schedule which produces representative demands imposed on the joints by
earthquakes. It does not include criteria for parameters which are, at times, stipulated in national standards or
building codes.
This standard is intended for joints subjected to lateral load ans is not applicable to joints subjected to
withdrawal forces.
This International Standard is applicable to joints made with mechanical fasteners used in timber structures
loaded under seismic action.
NOTE 1 In the context of this Standard, the term “joint” means “connection” in present-day North-American English.
NOTE 2 It is recognized that, for some special types of joints, modification of the test method may be necessary
provided the test objectives in this clause and the principles in Clause 6 are achieved. See Clause A.2 for details.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 3131, Wood — Determination of density for physical and mechanical tests
ISO 8970, Timber structures — Testing of joints made with mechanical fasteners — Requirements for wood
density
ISO 6891, Timber structures — Joints made with mechanical fasteners — General principles for the
determination of strength and deformation characteristics
k Joint stiffness, in newtons per millimetre, or newton-millimetres per radian in the case of joint rotation
νu Ultimate joint displacement, in millimetres, or radians in the case of joint rotation (as defined in Figure 1)
NOTE “Load” and “displacement” are taken as generic terms. Load could be axial, shear, moment or torsion.
Displacement could be any displacement (or slip) or rotation.
4 Test specimens
4.1 Conditioning
Attention shall be given to the conditioning of the timber before the manufacture of the joint and also to the
conditioning of the joints after their fabrication.
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The conditioning shall be conducted in such a way that the test conditions correspond in a realistic manner to
the in-service conditions of joints in structures.
Where the purpose of testing is to compare joints under similar conditions, the standard atmosphere of 20 °C
and 65 % relative humidity according to ISO 554 shall be used for conditioning. Density of the specimens shall
comply with the requirements given in ISO 8970.
Joint geometry, loading configuration and fabrication details (e.g. elapsed time between the fabrication and
test, predrilling of holes, tolerances, conditioning details before and after fabrication) shall be representative of
the intended end use.
4.3 Sampling
Sampling should provide for selection of representative test material on an objective and unbiased basis,
covering an appropriate range in density and properties as circumstances suggest.
The number of replicates depends on the specific objectives and desired reliability.
NOTE A minimum of 6 replicates is recommended for each of the static and cyclic tests to obtain a reliable estimate
of mean mechanical properties.
5 Apparatus
The test apparatus, tolerances and restraints shall be of realistic forms that are representative of the intended
end use.
The testing machine shall be able to apply and continuously record load and joint displacement with an
accuracy of ± 1 % of the estimates of Fmax and νu or better.
It is recommended that displacement measurements be made in such a way that the amount of member
deformation included in displacement readings is minimized.
6 Test procedure
Static (monotonic) tests shall be conducted on a matched group (or specimen) according to ISO 6891 with the
exception of preloading. The mean value (where applicable) of the ultimate displacement or rotation (νu) of the
static tests will be determined by following the definition of νu in Figure 1.
NOTE Static (monotonic) test data previously obtained on a matched group (or specimen) may also be used.
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ISO 16670:2003(E)
Key
X Displacement, v
Y Load, F
1 case a
2 case b
a Displacement at failure (case a).
b Displacement at 0,8Fmax in the descending portion of the load-displacement curve (case b).
Figure 1 — Definition of ultimate joint displacement: νu corresponds to either vua or vub, whichever
occurs first in the test
a) data that sufficiently describe the elastic and inelastic cyclic properties of the joint, and
The cyclic displacement schedule given in Figure 2 shall be followed with a rate of slip between 0,1 mm/s and
10 mm/s. The amplitudes of the reversed cycles are a function of the mean value (where applicable) of the
ultimate displacement (νu) obtained in the monotonic test. Table 1 presents the amplitudes as a percentage of
the ultimate joint displacement.
NOTE An alternative cyclic displacement schedule — either velocity or frequency based — that satisfies the
principles given above may also be employed to achieve the test objectives.
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7 Test results
The complete hysteretic response data (load-displacement or moment-rotation data) shall be plotted and
stored for each test joint. In organizing raw data (whether tabulated on paper or stored in a computer file), the
following shall be included: time, input displacement, measured load and measured displacement.
The first, second and third envelope curves for the cyclic tests shall be established by connecting the points of
maximum load in the hysteresis plot in each slip level in the first, second and third reversed cycles,
respectively. The maximum load values and their associated displacements obtained in the first five single
reversed cycles shall be taken to be the same for all envelope curves. The envelope curves shall be reported
in tabular form.
NOTE An example is given in Figure A.1 and Table A.1 in Clause A.5.
The maximum loads and ultimate displacements (both defined in Figure 1) in both directions taken from the
three envelope curves shall be reported in tabular form.
8 Test report
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The test report shall include the following information:
a) specification of the source, species, density and relevant strength properties of the timber members, and
the sampling and conditioning methods;
b) specification and sampling of the fasteners including dimensions, and surface coating;
c) a description of the fabrication details (e.g., elapsed time between the fabrication and test, predrilling of
holes, and tolerances);
d) a description of the joint geometry (e.g., dimensions of the joint members, number of fasteners,
arrangement and spacing, details of the gaps between members) and the loading configuration;
e) a test matrix showing the number of replicates for each test group;
f) a description of the test apparatus and a diagram of the test set-up with location of measuring devices,
tolerances and any restraints;
j) a plot of the hysteresis data (load-displacement or moment-rotation data), and tabulated envelope curves,
maximum loads, ultimate displacement, moisture content of the wood at the time of fabrication and test,
density and failure modes.
Annex A
(informative)
Additional information
a) The cyclic displacement schedule includes the application of reversed cycles in terms of percentage of
the joint’s ultimate displacement from static test, a property which can be easily determined and which is
defined with reasonable agreement throughout the world.
The method does not depend on a yield displacement. It is difficult to reach an agreement on its definition
because of differences in national standards. However, one can use the monotonic and cyclic test results
to determine the yield displacement according to any given definition.
b) The method generates suitable data in the elastic and in-elastic ranges. In the elastic range, only one
cycle is applied for each of the displacement levels (1,25 %, 2,5 %, 5 %, 7,5 % and 10 % of ultimate
displacement). In the in-elastic range, the method generates three envelope curves which are evenly
distributed along the displacement axis. These envelope curves may be used to determine impairment of
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strength, ductility and yield displacement according to the definitions adopted in different jurisdictions.
c) It is desirable to perform the reversed cyclic tests within a few minutes because earthquakes do not
generally last more than 1 min. The upper limit (10 mm/s) was selected as the fastest rate which may be
employed with the intention of avoiding dynamic effects to the test specimen. The lower limit (0,1 mm/s)
was selected as the lowest rate to accommodate the use of test equipment which have limitations in
applying relatively high rates of displacements. This International Standard allows the use of both
velocity- or frequency-based test protocols.
a) the behaviour of the joint is significantly different in two opposite directions. In this case, monotonic tests
should be performed in both directions. The ultimate displacement in cyclic displacement schedule should
then be determined for each direction based on their respective ultimate displacement obtained in
monotonic tests.
b) the joint exhibits in-elastic behaviour within five initial steps. In this case,
1) new single steps may be added to ensure a minimum of three steps for obtaining sufficient data
within the elastic range, and
2) initial steps beyond the elastic range should be repeated three times to generate three envelope
curves.
c) the amplitudes of the first and second steps are too small to be accurately applied. In this case, the first
and second steps may be omitted.
d) decreasing cycles are necessary (for example, to generate suitable data for calibration of hysteresis
models). In this case, application of single decreasing cycles before increasing to the next displacement
cycle may be added to the displacement schedule.
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ISO 16670:2003(E)
e) specific earthquake effects are studied (e.g. near-fault earthquake effects, cumulative damage effects,
etc.).
f) the joint-displacement increases at zero load at the beginning of the test due to fastener tolerance (e.g.
bolted joints). In this case, this tolerance may be subtracted from measured displacement values when
determining the amplitudes for cyclic displacement schedules.
from the envelope curves according to the definitions adopted in different jurisdictions.
0,3 Fmax
K=
v 40% F max − v10% F max
for the static (monotonic) and first, second and third envelope curves of the cyclic test specimens. v40 %Fmax
and v10 %Fmax are the displacement values obtained at 40 % and 10 % of the ultimate load (Fmax) respectively
for the respective envelope curve.
In the future, there may be a need to determine some additional properties such as energy dissipation. For
that purpose, it is recommended that data be stored preferably in digital form for complete description of the
hysteresis loops, as described in 7.1.
Key
1 1st envelope curve
2 2nd envelope curve
3 3rd envelope curve
0,2 448,4 −0,2 −360,2 0,2 448,4 −0,2 −360,2 0,2 448,4 −0,2 −360,2
0,4 524,3 −0,3 −450,8 0,4 524,3 −0,3 −450,8 0,4 524,3 −0,3 −450,8
0,5 563,5 −0,6 −543,9 0,5 563,5 −0,6 −543,9 0,5 563,5 −0,6 −543,9
0,9 646,8 −0,9 −600,3 0,9 646,8 −0,9 −600,3 0,9 646,8 −0,9 −600,3
1,3 695,8 −1,2 −641,9 1,3 695,8 −1,2 −641,9 1,3 695,8 −1,2 −641,9
2,5 818,3 −2,5 −808,5 2,7 717,9 −2,7 −764,4 2,7 708,1 −2,6 −705,6
5,2 1 058,4 −5,0 −982,5 5,5 886,9 −5,3 −857,5 5,4 732,6 −5,4 −818,3
7,9 1 131,9 −7,9 −1 082,9 7,9 786,5 −8,0 −933,5 8,0 732,6 −8,0 −837,9
10,4 1 087,8 −10,4 −945,7 10,8 742,4 −10,6 −801,2 10,7 597,8 −10,9 −776,7
13,5 1 043,7 −13,2 −933,5 13,6 725,2 −13,3 −796,3 13,6 595,4 −13,4 −688,5
16,1 877,1 −16,1 −752,2 16,2 578,2 −16,0 −477,8 16,3 193,6 −16,1 −441,0
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Negative −837,9 −13,6
NOTE In this example, the ultimate displacement is defined as the displacement at 80 % of the maximum load in the descending
portion of the load-displacement envelope curve.
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ISO 16670:2003(E)
Bibliography
[1] FOLIENTE, G.C., KARACABEYLI, E., YASUMURA, M. 1998. International test standards for joints in timber
struictures under earthquake and wind loads. Proc. Structural Engineers World Congress;
San Francisco, CA. USA. Reference T222-6
[2] KARACABEYLI, E., CECCOTTI, A. 1998. Nailed wood-frame shear walls for seismic loads: test results and
design considerations. Proc. Structural Engineers World Congress; San Francisco, CA. USA.
Reference: T207-6
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