Tiêu chuẩn iso 12122 4 2017

© ISO 2017 Timber structures — Determination of characteristic values — Part 4 Engineered wood products Structures en bois — Détermination des valeurs caractéristiques — Partie 4 Produits bois reconst[.]

Timber structur es — Determination

Part 4:

Struc ture s en b is — Déte mination de s v leurs caractéristiques —

Partie 4 : Produits b is r co stitu s

Fir t edition

2 17-0

Refer ence n mb r

ISO 1 1 2-4:2 17(E)

COPYRIGHT PROTECTED DOCUMENT

© ISO 2017, P blshed in Sw itz rlan

A ll rig hts r eserved Unles otherw ise spe ified, nopar of this p blc tion ma y be r epr od c d or utilz d otherw ise in an form

or b an me ns, ele tr onic or me hanic l, inclu in p oto opying , or postin on the internet or an intranet , w ithout prior

written permis ion Permis ion c n be req esed from either ISO at the ad r es below or ISO’s member bod y in the c u try of

the r eq eser

ISO c pyrig ht ofic

C de Blan on et 8 • C 4 1

CH-1 14 Vernier, Geneva, Switzerlan

Tel + 12 7 9 011

Fax 412 7 9 0 4

c pyrig ht@iso.or g

www.iso.or g

F reword i v

Introduction v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 1

4 Symbols 2

5 Referenc e po ulatio 2

6 S mpl ng 2

6.1 Sampl ng method

2 6.2 Sample siz 2

7 S mple c onditio ing 2

8 Test data 3

8.1 Tes method 3

8.2 Tes data compatible with pr od ct desc iption 3

8.3 Faiur e modes 3

9 Evaluatio of character istic values for str uctur al properties 3

9.1 Structur al pr ope ties 3

9.2 Characte istic v luesof mate ial pr ope ties 3

9.2.1 Characte is ic mod lus of elas icity an shear mod lus

3 9.2.2 Characte is ic bearing s r eng th 4

9.2.3 Othe char acte is ic v lues for streng th b sed on the 5th per centie tes v lue 4

9.3 Characte istic v luesof comp nent pr ope ties 4

9.3.1 Characte is ic s ifnes 4

9.3.2 Characte is ic bearing s r eng th 4

9.3.3 Othe char acte is ic ca acities for s r eng th b sed on the 5th per centie tes v lue 4

10 Repor t 4

A nne x A (informative)Commentar y 5

A nne x B (informative)A nal ytical models for deter mining character istic pr operties of eng ine red wo d pr od cts 10

Biblog raphy 11

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www iso org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www iso org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific terms an ex r s ions r lat ed to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www iso org iso/ for word html

The committ ee r sp nsible for thisdocument is ISO/TC1 5, Timbe s truc tur s

A l s of al the p rt in the ISO 1 1 2 se iescan be foun on the ISO websit e

This document set out a framework for es a l shing charact eris ic v luesfrom t es r sult on a sample

drawn from a clearly defined r fe enc po ulation of engine r d wo d prod ct The charact eris ic

v lue is an es imat e of the pro e ty of the r fe enc p pulation with a consist ent level of conf idenc

pr sc ibed in the s an ard

This document is int en ed t o be used in conju ction with ISO 1 1 2-1

This document pe mit the ev luation of charact eris ic v lues on t es ing on comme cial engine r d

wo d prod ct

In some cases, charact eris ic v lues det ermined in ac ordanc with this document ma be modified t o

be ome a design v lue

The document hasthe folowing an ex es:

— Annex A pr sent a commentary on this documen

— Annex B pr sent information on methods for calculating charact eris ic v lues from comp nent

pro e ties

Timber structur es — Determination ofcharacteristic

Part 4:

This document gives methods of det ermination of charact eris ic v lues for a def ined po ulation of

engine r d wo d prod ct calculat ed from t es v lues

This document pr sent methodsfor the det ermination of

a) charact eris ic v lue of mat erial pro e ties, w he e the det ermined pro e ty is multipled b a

g eometric p ramet er t o give a comp nent ca acity or comp nent s ifnes , or

b) charact eris ic v lue of comp nent pro e ties dir ctly, w he e the det ermined pro e ty is a

comp nent ca acity or comp nent s ifnes

This document pr sent methodsfor det ermination of

a) charact eris ic v lue of mean-b sed pro e ties, an

b) charact eris ic v lue of 5th pe c ntie-based pro e ties

2 Normati ve r eferences

The folowing document ar r fe r d t o in the t ext in such a wa that some or al of their cont ent

cons itut es r q ir ment of this document F or dat ed r fe enc s, only the edition cit ed a ples F or

un at ed r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment ) a ples

ISO 1 1 2-1:2 14, Timbe s truc tur s — Dete min tio o charac te i s tic v lues — Part 1: B as ic

r q ir ments

3 Terms and definitions

For the purp ses of this document, the terms an definitions given in ISO 1 1 2-1 an the folowing a pply

ISO an IEC maintain t erminolo ical data ases for use in s an ardization at the folowing ad r s es:

— IECEle tro edia: a aia le at ht p:/ www ele tro edia org

— ISO Onlne brow sing plat orm:a ai a le at ht p:/ www iso org o p

3.1

engine red woo prod ct

it em man factur d from wo d, namely plywo d, orient ed s ran bo rd, I beams, laminat ed vene r

lumbe or s ructural insulat ed panel wal s

Note 1t o entry: These prod cts that are def ined in ISO 1 4 5, ISO 168 4,ISO 2 3 9-1, ISO 2 3 0 an ISO 2 45

4 Symbols

Symb ls defined in the r lev nt ISO prod ct or t es s an ard shal be used Othe symb ls ar defined

in ISO 1 1 2-1

5 Refer enc e population

In ad ition t o the r q ir ment for definition of the r fe enc po ulation in ISO 1 1 2-1, the folowing

at ribut es of engine r d wo d prod ct ma be desc ibed:

a) sour es of raw mat erial;

b) seasoning method ( if seasoned);

c) grading or prod ction method for comp nent of the engine r d wo d prod ct w he e it is made of

pr viously graded comp nent ( inclu ing lamelae);

d) spe if ication of ad esives, method of a plcation an method of curing ad esives;

e) q alty control measur s;

f) se on ary proc s ing, such aspr se v tive tr atment, f ir r tardant r atment, profilng, et c

g) v riations in the conf iguration of the prod ct ( if any)

6.1 S mpl ng method

The sampl ng method shal comply with the pe formanc o je tive of sampl ng defined in ISO 1 1 2-1

R epr sentation of each of the v riant in the sample shal a pro imat e the r pr sentation of the same

v riant in the r fe enc p pulation

S e Clause 1 an ISO 1 1 2-1 for r porting r q ir ment on the samplng method The r p rt should

in icat e a r sp nse t o each of the identified at ribut es of the r fe enc p pulation lst ed in compl anc

with Clause5 or othe wiseimp rtant t o the desc iption of the r fe enc p pulation

6.2 S mple size

The sample siz shal comply with r q ir ment of ISO 1 1 2-1 an shal take int o ac ou t the

coefficient of v riation (V ) ex e t ed for the sawn timbe in the r fe enc p pulation

NOTE 1 S e notes u der the relevant clause in ISO 1 1 2-1

Engine r d wo d prod ct ’ pro e ties g ene aly ha e lowe p pulation coefficient of v riation (V ) in

s ructural pro e ties an should the efor ha e a smale sample siz

NOTE 2 ISO 1 1 2-1 gives some guidance on selecting sample size

7 Sample c onditioning

The sample st orag e an t es ing environment hal r fle t con itioning in ac ordanc with the def inition

of the r fe enc po ulation as in icat ed in ISO 1 1 2-1

8 Test data

8.1 Test method

The t es data shal be o tained from

a) t es s in ac ordanc with the ISO t es s an ard r lev nt t o the prod ct, or

b) a s an ard t es method a pro riat e for the r fe enc p pulation, pro ided eq iv lency fact ors

with the r lev nt ISO t es s an ard can be es a l shed

NOTE S e notes u der the relevant clause in ISO 1 1 2-1

Tes methods inv lve many v ria les that wi afe t r sult inclu ing lo ding conf iguration and rat es,

spe imen p sitioning an measur ment methods The level of pr cision of these v ria les should be

a pro riat e t o the o je tivesof the t es ing an the adjus ment r q ir d in 8.2

8.2 Test data compatible with product des r iption

Whe e the charact eris ic v lue is a plca le t o a s an ard siz or mois ur cont ent, adjus ment t o

the t es data ma be r q ir d Any adjus ment shal be in ac ordanc with ISO 1 1 2-1 an shal be

detaied in the r p rt

NOTE T ese adjustments inclu e those req ired to po l data from diferent test pro rams as outlined in

ISO 1 1 2-1

8.3 F i ur e modes

The faiur modes o tained in the t es sshal be r corded

The data shal only be inclu ed in the analy sis if it comes from a t es in w hich the fai ur mode

a pro riat e t o the pro e ty waso tained

NOTE T e same test method may prod ce diferent failure modes on diferent prod cts T e charact eristic

value may b u derestimated by tests that prod ce failure modes that are diferent t o the ones that the test

method was inten ed t o prod ce

9 Evaluation ofcharacteristic values for str uctural proper ties

9.1 Structural proper ties

F or engine r d wo d prod ct , eithe mat erial pro e ties or comp nent pro e ties shal be ev luat ed

NOTE 1 An e A gives guidance on the ty e of property that is ap ropriate for some common engine red

wood prod cts

NOTE 2 Where component properties are reported, they are in g eneral specif ic to a given size of prod ct

Diferent sized prod cts wil have diferent component properties

Det ermination of the charact eris ic v lues for s ructural pro e ties shal be in ac ordanc with

ISO 1 1 2-1 u les spe ificaly spe if ied in the r fe enc prod ct s andard

9.2 Characteristic values of material pr operties

9.2.1 C aracteristic mo ulus of elasticity and she r mo ulus

The charact eris ic mod lus of elas icity an shear mod lus shal be the mean v lue, taken as the

a e ag e of the t es v lues ev luat ed in ac ordanc with ISO 1 1 2-1

9.2.2 C aracter istic be r ing str eng th

The charact eris ic v lues for bearing s r ngth, b th p ralel an pe pen icular t o grain, shal be the

mean pro e ty o tained from r sult of t es s

9.2.3 Other characteristic values for str eng th based on the 5th perc entie test value

The 7 % lowe single-sided conf idenc lmit of the t es 5th pe c ntie v lue shal be ev luat ed Suita le

methods for ev luating the 5th pe c nti e v lue of the t es data an es imating the 7 % lowe

single-sided con denc lmit ar pr sent ed in ISO 1 1 2-1

9.3 Characteristic values of c omponent properties

9.3.1 C aracter istic stifnes

The charact eris ic s ifnes shal be the mean v lue, taken as the a e ag e of the t es v lues ev luat ed in

ac ordanc with ISO 1 1 2-1

9.3.2 C aracter istic be r ing str eng th

The charact eris ic v lues for bearing s r ngth ev luat ed in ac ordanc with 9.2.2, b th p ralel an

pe pen icular t o grain, shal be the mean pro e ty o tained from r sult of t es s

NOTE Even though other properties are component properties, b aring strengths are g neral y reported as

material properties F rther guidance is given in An e A

9.3.3 Other characteristic capacities for str eng th based on the 5th per c enti e test value

The 7 % lowe single-sided conf idenc lmit of the t es 5th pe c ntie v lue shal be ev luat ed Suita le

methods for ev luating the 5th pe c nti e v lue of the t es data an es imating the 7 % lowe

single-sided con denc lmit ar pr sent ed in ISO 1 1 2-1

10 Report

The r p rt shal comply with the r q ir ment of ISO 1 1 2-1

A nne x A

Commentar y

A 1 Commentary on sc ope

This document pr sent methods for det ermining charact eris ic v lues for engine r d wo d prod ct

It ist o be used in conju ction with ISO 1 1 2-1

This document pr sent a u iform methodolo y for the ev luation of charact eris ic v lues that ar

consist ent with the charact eris ic v lues fou d for othe s ructural timbe prod ct

This document does not es a l sh methods for the det ermination of design v lues, w hich ma be

det ermined b sed on charact eris ic v lues from t es data b incorporating safety fact ors t o ac ount or

any or al of the folowing fact ors

— Ex e t ed chang es in prod ct or prod ct pro e ties o e a long pe iod These chang es could be d e

t o v riations in timbe r sour e q alty, prod ction methodsor chang es in othe raw mat erials

— The complexity of the r fe enc po ulation F or ex mple, w he e the r fe enc p pulation has a

larg e n mbe of prod c rs w ho draw their r sour es o e a larg e ar a or use dife ent prod ction

paramet ers, then the samplng ma not efe tively r fle t al p s ible combinations of r sour e

q alty an prod ction methods In this wa , the sample ma not be truly r pr sentative an a

safety fact or ma be a pled t o alow for that

— Variations in time of the as embly used for the engine r d wood prod ct These v riations ma

inclu e en -joint r atment of element , element spe if ication, curing an holding times

— Anticip t ed v riations in q alty control ac os the r fe enc p pulation in the futur

Charact eris ic v lues pr sent ed in this document r lat e only t o the det ermination of charact eris ic

v lues from the r sult of t es s on ful -scale engine r d wood prod ct The ISO 1 1 2- se ies has this

common b sis Howeve , in many cases, the charact eris ic pro e ties for engine r d wood prod ct

ar fou d from calculation using models that r lat e the pro e ties of the individ al element t o the

pro e ties of the comp sit e prod ct The sco e of this document does not co e these methods, but

An ex B contains information l n ing t o some commonly ac ept ed models for these calculations This

document can be used t o ve ify such models using t es s on ful-scale engine r d wo d prod ct

A 2 Commentary on normati ve referenc es

No commentary

A 3 Commentary on terms and definitions

No commentary ( Se ISO 1 1 2-1 )

A 4 Commentary on symbols

No commentary ( Se ISO 1 1 2-1 )