Tiêu chuẩn iso 12122 3 2016

© ISO 2016 Timber structures — Determination of characteristic values — Part 3 Glued laminated timber Structures en bois — Détermination des valeurs caractéristiques — Partie 3 Exigences pour les bois[.]

Timber structur es — Determination

Part 3:

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

Partie 3: Exigenc s p ur le s b is lame llé-colé

Fir t edition

2 16-07-0

Refer ence n mb r

ISO 1 1 2-3:2 16(E)

COPYRIGHT PROTECTED DOCUMENT

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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 and abbreviated terms 1

5 Referenc e po ulatio 1

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 2

8.1 Tes method 2

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 mod lus of elas icity or s ifnes 3

9.3 Characte istic v luesof str eng th or ca acity

3 9.3.1 Characte is ic bearing s r eng th 3

9.3.2 Othe char acte is ic v lues for streng th or ca acity b sed on the 5th per centie tes v lue 3

10 Repor t 3

A nne x A (informative)Commentar y 4

A nne x B (informative)A nal ytical models for deter mining character istic pr operties of glued laminated timber 8

Biblog raphy 9

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 t erms an ex r s ions r lated 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

ISO 1 1 2 consis s of the folowing p rt , u de the g ene al title Timbe s truc tur s — Dete min tio o

ch rac te i s tic v lues:

— Part 1: B as ic r q ir ments

— Part 2 : S w n timbe

— Part 3 : Glued lamin ted timbe

— Part 4: En ine r d wo d produc ts

)

— Part 6 : L rge c omp nents a d as s embles

)

The folowing p rt ar u de pr p ration:

— Part 5: Mecha ic al c on ec tions

1) To b p blished

This p rt of ISO 1 1 2 set out a framework for es a lshing charact eris ic v lues from t es r sult on a

sample drawn from a clearly defined r fe enc p pulation of glued laminat ed timbe Thecharact 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 this p rt of ISO 1 1 2

This part of ISO 1 1 2 is t o be used in conju ction with ISO 1 1 2-1

This p rt of ISO 1 1 2 pe mit the ev luation of charact eris ic v lues on t es ing on comme cial siz d

spe imens of glued laminat ed timbe Whe e the charact eris ic v lues ar de ived using calculations

b sed on laminat e s ructural pro e ties, this p rt of ISO 1 1 2 does not a ply, but Annex B r fe enc s

othe methods for es imating charact eris ic v lues

In some cases, charact eris ic v lues det ermined in ac ordanc with this part of ISO 1 1 2 ma be

modif ied t o be ome a design v lue

This part of ISO 1 1 2 has the folowing annex es:

— Annex A pr sent a commentary on this p rt of ISO 1 1 2;

— Annex B pr sent information on analytical models for det ermining charact eris ic v lues of glued

laminat ed timbe

Timber structur es — Determination ofcharacteristic

Part 3:

This part of ISO 1 1 2 gives methods for the det ermination of charact eris ic v lues for a def ined

p pulation of glued laminat ed timbe prod ct , calculat ed from t es v lues

It pr sent methods for the 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

NOTE An e B gives information on the methods that have b en suc es ful y used to estimat e the

characteristic values of glued laminated timb r prod cts from properties of the laminates

2 Normati ve r eferences

The folowing document , in w hole or in p rt, ar normatively r fe enc d in this document an ar

in ispensa le for it a pl cation F or dat ed r fe enc s, only the edition cit ed a pl es F or u dat ed

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

ISO 8 7 , Timbe s truc tur s — Glued lamin ted timbe — Tes t meth ds fr dete min tio o p ys ic al a d

mecha ic al pro erties

ISO 1 1 2-1, 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

F or the purp sesof this document, the t erms an definitions given in ISO 1 1 2-1 an ISO 1 5 8 a ply

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

4 Symbols and abbreviated terms

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

in ISO 1 1 2-1

5 Referenc e population

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

at ribut es of glued laminat ed timbe ma be inclu ed:

a) sour es of raw mat erial;

b) seasoning method ( if seasoned);

c) grading or prod ction method for laminat es inclu ing pr senc an fr q ency of f ing er joint ;

d) la up of the glued laminat ed prod ct ;

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

f) q alty control measur s;

g) v riations in the laminat es ( 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

The samplng method shal be document ed in the r p rt as detaied in Clause 1 an this documentation

shal in icat e a r sponse t o each of the identif ied at ribut es of the r fe enc p pulation l st ed in

complanc with Clause 5 an in ISO 1 1 2-1 or othe wiseimportant 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 glued laminat ed timbe in the r fe enc p pulation

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

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 Due t o the larg e siz of glued laminat ed timbe ,

it is ac epta le t o t es the sample at as-t est ed con itions pro ided that the r sult ar adjust ed in

ac ordanc with 8.2

8 Test data

8.1 Test method

The t es data shal be o tained from

a) ISO 8 7 , or

b) a s andard t es method a pro riat e for the glued laminat ed timbe r fe enc p pulation pro ided

eq iv lency fact orswith ISO 8 7 can be es a lshed

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 an rat es,

spe imen positioning 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 thet 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 pl ca le t o a s an ard siz or mois ur cont ent, adjus ment t o the

raw 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 ailure modes on diferent prod cts T e charact eristic

value may b u derestimat ed by tests that prod ce failure modes that are diferent t o 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 glued laminat ed timbe , 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 using data of mat erial pro e ties from glued laminat ed timbe t es s

( e Annex A for mor information)

NOTE An e A gives guidance on the ty e of property that is ap ropriat e for glued laminat ed timb r

9.2 Characteristic modulus of elasticity or stifnes

The charact eris ic mod lus of elas icity or s ifnes used for se vic a i ty 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, an in the case of it

use in the ultimat e l mit tat e it shal be eithe the averag e or the 5th pe c ntie v lue

NOTE In some cases, where a red ction of mod lus of elasticity or stifnes is not alre d factored into the

b haviour eq ation used for design, a 5th per entile value of mod lus of elasticity can b req ired t o design for

b am or column sta ility

9.3 Characteristic values of streng th or capacity

9.3.1 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

9.3.2 Othe character istic values for str eng th or capacity based on the 5th perc enti e test value

The 7 % lowe single-sided confidenc 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 conf idenc 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 nnex A

Commentary

A 1 Commentary on scope

This p rt of ISO 1 1 2 pr sent methods for det ermining charact eris ic v lues for glued laminat ed

s ructural timbe It is t o be used in conju ction with ISO 1 1 2-1

The p rt of ISO 1 1 2 pr sent a uniform methodolo y for the ev luation of charact eris ic v lues that

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

The part of ISO 1 1 2 does not es a lsh methods for the det ermination of design v lues These ma

be det ermined b sed on charact eris ic v lues from t es data, but for glued laminat ed timbe wi also

incorporat e a pro riat e 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 adhesives

— 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 e o e a larg e ar a, then the samplng ma not

efe tively r fle t al p s ible combinations of r sour e q al ty an prod ction methods In this

wa , the sample ma not be truly r pr sentative an a safety fact or ma be a pl ed t o alow for that

— Variations o e time of the la up used for the glued laminat ed timbe These v riations ma inclu e

pr senc or fr q ency of f ing er joint

— 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 p rt of ISO 1 1 2 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 glued laminat ed timbe prod ct The

w hole suit e of ISO 1 1 2 s andards has this common basis Howeve , in many cases, the charact eris ic

pro e ties for glued laminat ed timbe ar es imat ed from calculation using models that r lat e the

laminat e pro e ties t o the pro e ties of the comp sit e beams The sco e of this p rt of ISO 1 1 2 does

not co e these methods, but Annex B contains information l n ing t o some commonly ac ept ed models

for these calculations This part of ISO 1 1 2 can be used t o ve ify such models using t es s on ful-scale

glued laminat ed timbe prod ct

A 2 Commentary on normati ve referenc es

No commentary

A 3 Commentar y 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)

A 5 Commentary on r eferenc e population

Charact eris ic v lues can be taken t o r pr sent the pro e ties of the mat erial from w hich the sample

was taken The r fe enc po ulation is the def inition of the p r nt p pulation t o w hich the charact eris ic

pro e ties ar said t o a ply ISO 1 1 2-1 pr sent some g ene al r q ir ment for definition of the

r fe enc p pulation, but some othe featur s ar k own t o influenc the s ructural pro e ties of glued

laminat ed timbe

— The pro e ties of the wood that is the raw mat erial for the glued laminat ed timbe prod ct ma

afe t thepro e ties of the final prod ct This means that the def inition of the r fe enc p pulation

should inclu e al p s ible sour es of wood for the prod ct This wi also r q ir samplng ac os

the ful rang e of raw mat erial sour es t o ensur that the t es sample is truly r pr sentative of the

r fe enc p pulation

— Tempe atur of seasoning ma also ha e an influenc on the s ructural pro e ties of seasoned

wood mat erials Rang e of seasoning t empe atur s an the method of seasoning, w hich ma r lat e

t o the spe d of mois ur r mo al, should be de lar d

— Grading of raw mat erial an prod ction methods emplo ed ma also ha e a significant influenc

on the pro e ties of the complet ed glued laminat ed timbe prod ct In some cases, r latively smal

chang es in grading (e.g v riation of laminat e knot lmit ) ma significantly afe t some pro e ties

Likewise, some man facturing detai s ma be c itical t o some prod ct pro e ties These ma

inclu e pr senc of fing er-joint in out er laminations, sharpnes of cutt ers for profilng fing er joint

or holding pr s ur s an times for glued joint Whe e a r fe enc p pulation ma be drawn from

plant that use a rang e of man facturing proc s es, they should al be r pr sent ed in the t es sample

— The beha iour of the ad esive un e a pled lo d is oft en c ucial t o prod ct tructural pe formanc

Henc , any fact or that ma influenc the s r ngth of the adhesive shal be l nked t o the r fe enc

po ulation Whe e a rang e of ad esive spe ifications, han l ng an a pl cation methods or curing

methods ma be pr sent in the r fe enc p pulation, these v riations should be de lar d an car

should be taken t o ensur that they ar al inclu ed in the r pr sentative sample

— Qualty control measur s ar oft en used t o maintain v rious aspe t of prod ction that can afe t

s ructural pro e ties Spe if ication of the q alty control proc s es is an imp rtant conside ation

in def ining the r fe enc po ulation Ideal y, al prod c rs inclu ed in the r fe enc p pulation

should ha e the same q alty control measur s, but w he e the e ar v riations, these should al be

inclu ed in the spe if ication of the r fe enc p pulation

— Whe e the prod ct spe ification uses laminat es of dife ent grades used in dife ent part of the

glued laminat ed beam, this should be de lar d as a charact eris ic of the r fe enc p pulation Al

prod c rs in the r fe enc p pulation should be using the same la up spe ification as it usualy has

a significant efe t on the s ructural pro e ties of the prod ct

Whe e the charact eris ic v lues ar t o be mat erial pro e ties (e.g ben ing s r ngth, f

m ), it is pos ible

that the r fe enc p pulation can inclu e a rang e of siz s as the ca acity of the dife ent siz d prod ct

can be ev luat ed using the dife ent g eometric p ramet ers for each siz Ifthis is the case, the siz

rang e in the r fe enc po ulation should be de lar d

ISO 1 1 2-1 r fe s t o the pe iod o e w hich the prod ct was man factur d In some clmat es, the time

of year can afe t the pro e ties of the raw mat erials or man facturing proc s es in use

The ls s in ISO 1 1 2-1 an in this p rt of ISO 1 1 2 ar ex mples, but the int ent of the clause is that

anything in the man factur of the prod ct that ma afe t the s ructural pro e ties shal be inclu ed

in the desc iption