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Caractérisation en compression simple des blocs de terre comprimée

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N° d'ordre 02 ISAL 0037 Année 2002<br />

THESE<br />

Prés<strong>en</strong>tée <strong>de</strong>vant<br />

L’INSTITUT NATIONAL DES SCIENCES APPLIQUEES DE LYON<br />

Pour obt<strong>en</strong>ir<br />

LE GRADE DE DOCTEUR<br />

FORMATION DOCTORALE : Génie Civil: Sols, Matériaux, Structures, Physique du Bâtim<strong>en</strong>t<br />

ECOLE DOCTORALE DES SCIENCES POUR L’INGENIEUR DE LYON :<br />

Mécanique, Energétique, Génie Civil, Acoustique (MEGA) –ECL – INSA – UCBL-ENTPE<br />

PAR<br />

Abalo P'KLA<br />

Ingénieur génie civil <strong>de</strong> Lomé - Togo<br />

CARACTERISATION EN COMPRESSION SIMPLE<br />

DES BLOCS DE TERRE COMPRIMEE (BTC) : APPLICATION AUX<br />

MACONNERIES "BTC-MORTIER DE TERRE"<br />

Sout<strong>en</strong>ue le 3 juillet 2002 <strong>de</strong>vant la commission d'Exam<strong>en</strong> :<br />

Normando P. BARBOSA<br />

Hervé DI BENEDETTO<br />

Pierre FORAY<br />

Ali MESBAH<br />

Jean Clau<strong>de</strong> MOREL<br />

Myriam OLIVIER<br />

Jean Marie REYNOUARD<br />

Vinc<strong>en</strong>t RIGASSI<br />

Rapporteur<br />

Directeur <strong>de</strong> thèse<br />

Rapporteur<br />

Tuteur<br />

Présid<strong>en</strong>t<br />

Cette thèse a été préparée au Laboratoire Géomatériaux du Départem<strong>en</strong>t Génie Civil et Bâtim<strong>en</strong>t <strong>de</strong><br />

l'Ecole Nationale <strong><strong>de</strong>s</strong> Travaux Publics <strong>de</strong> l'Etat (ENTPE)


A ma famille<br />

A celle qui accepte être la bonne épouse et mère<br />

A tous tes <strong>en</strong>fants et à ceux qui leur ressembl<strong>en</strong>t<br />

« Seul l'innoc<strong>en</strong>t est capable <strong>de</strong> percevoir la nature <strong>en</strong> toute<br />

vérité. Car au comm<strong>en</strong>cem<strong>en</strong>t était la simplicité avec l'<strong>en</strong>fant<br />

qui <strong>en</strong>tre dans la connaissance par intuition. Puis vinr<strong>en</strong>t la<br />

complication et la complexité avec l'adulte qui, dans la<br />

douleur du raisonnem<strong>en</strong>t, <strong>en</strong>fante la sci<strong>en</strong>ce. La souffrance<br />

naît ainsi avec l'adulte qui doit, pour s'<strong>en</strong> délivrer, t<strong>en</strong>dre la<br />

main à l'Esprit <strong>de</strong> l'Enfant par qui l'univers est créé. Le salut <strong>de</strong><br />

la sci<strong>en</strong>ce véritable se trouve uniquem<strong>en</strong>t dans la voie du<br />

r<strong>en</strong>oncem<strong>en</strong>t »<br />

Un fils spirituel d'Abba Isaac le syri<strong>en</strong><br />

(Abba Isaac, moine du Vlleme siècle)


je dis un énorme MERCI<br />

A Hervé Di BENEDETTO pour avoir accepté <strong>de</strong> diriger cette thèse.<br />

A Jean Clau<strong>de</strong> MOREL et Ali MESBAH. mes tuteurs, pour leur disponibilité illimitée et pour<br />

m'avoir offert un cadre intellectuel idéal <strong>de</strong> travail.<br />

Au présid<strong>en</strong>t du Jury, Jean Marie REYNOUARD.<br />

A Norman<strong>de</strong> BARBOSA et Pierre FORAY pour leur contribution à la qualité <strong>de</strong> ce travail <strong>en</strong><br />

tant que rapporteurs.<br />

A Vinc<strong>en</strong>t RIGASSI et Myriam OLIVIER pour m'avoir apporté leurs expéri<strong>en</strong>ces aussi bi<strong>en</strong><br />

pratiques que théoriques et pour leurs remarques qui m'ont été indisp<strong>en</strong>sables à la finalisation<br />

<strong>de</strong> ce docum<strong>en</strong>t.<br />

A Alain MARCOM pour son assistance technique à l'élaboration <strong>de</strong> mes échantillons d'essai et<br />

à leur qualité.<br />

A Odile ROQUE pour ses conseils et son assistance technique dans la mise au point <strong>de</strong> mon<br />

dispositif expérim<strong>en</strong>tal.<br />

A Mme Hélène GEOFFROY pour son souti<strong>en</strong> saris mesure.<br />

A Mr et Mme EBEZOU et à., leurs <strong>en</strong>fants, à Eloani AGOU, Alassane OURO MEDELL, Ali<br />

TCHATAGBA et Aliassim BONFOH pour le cadre familial qu'ils m'ont offert.<br />

Au grand frère Antoine AMAI pour toute son att<strong>en</strong>tion à mon égard.<br />

Aux membres <strong>de</strong> mon équipe ENDJ, à notre CONSPI, le P. Jacques DECOLLONG.E et à notre<br />

COUAC, Mr et Mme REYDELLET.<br />

Aux frères et sœurs Togolais (Aa wakili gna..... !!!) et Africains <strong>de</strong> Lyon, <strong>de</strong> toute la France qui<br />

m'ont sout<strong>en</strong>u par leurs sages conseils.<br />

A mes amis <strong>de</strong> Lomé et du Togo tout <strong>en</strong>tier.<br />

Aux amis du laboratoire LGM pour leur convivialité.<br />

Au personnel du laboratoire LGM pour leur assistance.<br />

A la frangine Berthe DONGMO et à Givanildo AZEREDO pour m'avoir aidé à corriger cette<br />

thèse.<br />

A F iras ATASSI pour ses <strong>en</strong>couragem<strong>en</strong>ts.<br />

A Francette PIGNARD.<br />

Je voudrais particulièrem<strong>en</strong>t que NAPALA Odile daigne reconnaître sa bi<strong>en</strong>veillante main dans<br />

ce travail et que Mr et Mme BAWA (Olivier et Titi) puiss<strong>en</strong>t se réjouir <strong>de</strong> leur constante<br />

assistance.


Résumé<br />

Les maçonneries <strong>en</strong> BTC (Blocs <strong>de</strong> Terre Comprimée) permett<strong>en</strong>t <strong>de</strong> construire <strong><strong>de</strong>s</strong> habitats individuels à un<br />

faible coût <strong>en</strong>vironnem<strong>en</strong>tal (et économique pour les pays du sud) car on utilise <strong><strong>de</strong>s</strong> matériaux locaux. De plus<br />

cette démarche a un impact socioéconomique positif puisqu'elle favorise le travail humain direct <strong>de</strong> construction<br />

contrairem<strong>en</strong>t à la filière actuelle basée sur l'industrialisation <strong>de</strong> la production du matériau. L'architecture utilisée<br />

est adaptée au matériau qui ne doit travailler qu'<strong>en</strong> <strong>compression</strong>.<br />

Cette thèse s'inscrit dans un contexte <strong>de</strong> formalisation du comportem<strong>en</strong>t <strong>en</strong> <strong>compression</strong> <strong><strong>de</strong>s</strong> maçonneries <strong>en</strong><br />

BTC. Nous avons pour cela effectué une étu<strong>de</strong> <strong>de</strong> comportem<strong>en</strong>t <strong><strong>de</strong>s</strong> maçonneries <strong>en</strong> BTC sous <strong>compression</strong><br />

<strong>simple</strong> verticale. Le BTC est la composante principale <strong>de</strong> la maçonnerie. Ainsi une analyse <strong>de</strong> son comportem<strong>en</strong>t<br />

<strong>en</strong> <strong>compression</strong> <strong>simple</strong> est faite. Les différ<strong>en</strong>tes procédures d'essais <strong>de</strong> <strong>compression</strong> utilisées jusqu'à maint<strong>en</strong>ant<br />

sur BTC sont prés<strong>en</strong>tées et critiquées. Nous arrivons à la conclusion que l'essai sur <strong>de</strong>mis <strong>blocs</strong> maçonnés (l'un<br />

au <strong><strong>de</strong>s</strong>sus <strong>de</strong> l'autre) est pertin<strong>en</strong>t. Il est aussi démontré que l'essai <strong>de</strong> flexion <strong>en</strong> trois points peut donner la<br />

résistance <strong>en</strong> <strong>compression</strong> <strong>de</strong> BTC avec une précision <strong>de</strong> l'ordre <strong>de</strong> 20%. La secon<strong>de</strong> composante <strong>de</strong> la<br />

maçonnerie est le mortier <strong>de</strong> <strong>terre</strong> (à plus <strong>de</strong> 88% <strong>en</strong> poids sec <strong>de</strong> <strong>terre</strong>) stabilisé au cim<strong>en</strong>t. La littérature<br />

n'apporte que peu d'information sur ces mortiers à forte t<strong>en</strong>eur d'argile (<strong>en</strong>tre 5 et 20% d'argile). Nous faisons un<br />

bilan <strong><strong>de</strong>s</strong> procédures d'essais appropriés à ces types <strong>de</strong> mortier. Il <strong>en</strong> ressort l'impossibilité d'utiliser le<br />

maniabilimètre AFNOR, la possibilité d'utiliser le cône d'Abrams et la nécessité d'appréh<strong>en</strong><strong>de</strong>r le comportem<strong>en</strong>t<br />

d'interface BTC-mortier. Enfin <strong><strong>de</strong>s</strong> échantillons <strong>de</strong> maçonnerie <strong>de</strong> formulations différ<strong>en</strong>tes, d'<strong>en</strong>viron 1m 2 <strong>de</strong><br />

surface et <strong><strong>de</strong>s</strong> triplets <strong>de</strong> BTC maçonnés avec du mortier <strong>de</strong> <strong>terre</strong> sont testés <strong>en</strong> <strong>compression</strong> <strong>simple</strong>. Une<br />

différ<strong>en</strong>ce <strong>de</strong> 38% au maximum <strong><strong>de</strong>s</strong> résistances <strong>en</strong> <strong>compression</strong> <strong>en</strong>tre ces 2 types d'échantillons a été observée.<br />

Par ailleurs, l'application <strong>de</strong> la formule <strong>de</strong> l'Euroco<strong>de</strong> 6 (EC6) relative aux maçonneries conv<strong>en</strong>tionnelles<br />

conduit, d'une manière générale, à la sous estimation <strong>de</strong> la résistance <strong>en</strong> <strong>compression</strong> <strong><strong>de</strong>s</strong> maçonneries BTC<br />

par rapport aux valeurs expérim<strong>en</strong>tales. Les rapports <strong>en</strong>tre la résistance à la rupture calculée par la formule EC6<br />

et la valeur expérim<strong>en</strong>tale vari<strong>en</strong>t <strong>en</strong>tre 44 et 72%.<br />

Abstract<br />

Compressed earth blocks (CEB) masonry make it possible to build individual houses at a low <strong>en</strong>vironm<strong>en</strong>tal<br />

(and economic for poor countries) cost because of the use of local materials. Moreover, this step has a positive<br />

social and economic impact since it supports the direct human work of construction, contrary to the curr<strong>en</strong>t type<br />

of construction based on the industrialization of the material production.<br />

Architecture used in CEB construction is adapted to a material which should support only <strong>compression</strong> stress.<br />

This thesis is a contribution to the formalization of CEB masonries buildings <strong><strong>de</strong>s</strong>ign which concerns, until now,<br />

only the co<strong>de</strong> of practice. Only masonry behaviour un<strong>de</strong>r vertical <strong>compression</strong> load is analysed.<br />

As a preliminary, the CEB which constitute the principal compon<strong>en</strong>t of masonry were studied. The various<br />

<strong>compression</strong> tests used for CEB were pres<strong>en</strong>ted and criticized. Compression test on two half built blocks<br />

remains relevant. It was shown that three points b<strong>en</strong>ding test can also give compressive str<strong>en</strong>gth of CEB.<br />

The second compon<strong>en</strong>t of masonry is earth mortar stabilized with cem<strong>en</strong>t. There exists very little information<br />

on these mortars with strong clay cont<strong>en</strong>t (betwe<strong>en</strong> 5 and 20 % and more). An overview of mortar tests able to<br />

be used for earth mortar is ma<strong>de</strong> and lead to some propositions for future studies. Finally, two types masonry<br />

samples were tested un<strong>de</strong>r vertical <strong>compression</strong> load ; 1m 2 masonry and three blocks bpn<strong>de</strong>d samples. The<br />

Euroeo<strong>de</strong> 6 formula for masonry compressive str<strong>en</strong>gth assessm<strong>en</strong>t is used and the results compared with our.<br />

experim<strong>en</strong>tal data.


FOLIO ADMINISTRATIF<br />

THESE SOUTENUE DEVANT L'INSTITUT NATIONAL DES SCIENCES APPLIQUEES DE LYON<br />

NOM : P'KLA DATE <strong>de</strong> SOUTENANCE : 03 Juillet 2002<br />

(avec précision du nom <strong>de</strong> jeune fille, le cas échéant)<br />

Prénoms : Abalo<br />

TITRE : <strong>Caractérisation</strong> <strong>en</strong> <strong>compression</strong> <strong>simple</strong> <strong><strong>de</strong>s</strong> <strong>blocs</strong> <strong>de</strong> <strong>terre</strong> <strong>comprimée</strong> (BTEC) : Application aux maçonnerie « BTC –<br />

Mortier <strong>de</strong> <strong>terre</strong> »<br />

NATURE : Doctorat Numéro d'ordre : 02 ISAL 0037<br />

Formation doctorale : Génie Civil: Sols, Matériaux, Structures, Physique du Bâtim<strong>en</strong>t<br />

Cote B.I.U. - Lyon : T 50/210/19 / et bis CLASSE :<br />

RESUME :<br />

Les maçonneries <strong>en</strong> BTC (Blocs <strong>de</strong> Terre Comprimée) permett<strong>en</strong>t <strong>de</strong> construire <strong><strong>de</strong>s</strong> habitats individuels à un faible coût<br />

<strong>en</strong>vironnem<strong>en</strong>tal (et économique pour les pays du sud) car on utilisa <strong><strong>de</strong>s</strong> matériaux locaux. De plus cette démarche a un<br />

impact socioéconomique positif puisqu'elle favorise le travail humain direct <strong>de</strong> construction contrairem<strong>en</strong>t à la filière actuelle<br />

basée sur l'industrialisation <strong>de</strong> la production du matériau. L'architecture utilisée est adaptée au matériau qui ne doit travailler<br />

qu'<strong>en</strong> <strong>compression</strong>.<br />

Cette thèse s'inscrit dans le contexte <strong>de</strong> formulation du comportem<strong>en</strong>t <strong>en</strong> <strong>compression</strong> <strong><strong>de</strong>s</strong> maçonneries <strong>en</strong> BTC. Nous avaons<br />

pour cela effectué une étu<strong>de</strong> <strong>de</strong> comportem<strong>en</strong>t <strong><strong>de</strong>s</strong> maçonneries <strong>en</strong> BTC sous <strong>compression</strong> <strong>simple</strong> verticale.<br />

Le BTC est la composante principale <strong>de</strong> la maçonnerie. Ainsi une analyse <strong>de</strong> son comportem<strong>en</strong>t <strong>en</strong> <strong>compression</strong> <strong>simple</strong> est<br />

faite. Les différ<strong>en</strong>tes procédures d'essais <strong>de</strong> <strong>compression</strong> utilisées jusqu'à maint<strong>en</strong>ant sur BTC sont prés<strong>en</strong>tées et critiquées.<br />

Nous arrivons à la conclusion que l'essai sue <strong>de</strong>mis <strong>blocs</strong> maçonnés (l'un au <strong><strong>de</strong>s</strong>sus <strong>de</strong> l'autre) est pertin<strong>en</strong>t. Il est aussi<br />

démontré que l'essai <strong>de</strong> flexion <strong>en</strong> trois points peut donner la résistance <strong>en</strong> <strong>compression</strong> <strong>de</strong> BTC avec une précision <strong>de</strong> l'ordre<br />

<strong>de</strong> 20%.<br />

La secon<strong>de</strong> composante <strong>de</strong> la maçonnerie est le mortier <strong>de</strong> <strong>terre</strong> (à plus <strong>de</strong> 88% <strong>en</strong> poids sec <strong>de</strong> <strong>terre</strong>) stabilisé au cim<strong>en</strong>t. La<br />

littérature n'apporte que peu d'information sur ces types <strong>de</strong> mortier. Il <strong>en</strong> ressort l'impossibilité d'utiliser le maniabilimètre<br />

AFNOR, la possibilité d'utiliser le cône d'Abrams et la nécessité d'appréh<strong>en</strong><strong>de</strong>r le comportem<strong>en</strong>t d'interface BTC-mortier.<br />

Enfin <strong><strong>de</strong>s</strong> échantillons <strong>de</strong> maçonnerie <strong>de</strong> formulations différ<strong>en</strong>tes, d'<strong>en</strong>viron 1m2 <strong>de</strong> surface et <strong><strong>de</strong>s</strong> triplets <strong>de</strong> BTC maçonnés<br />

avec du mortier <strong>de</strong> <strong>terre</strong> sont testés <strong>en</strong> <strong>compression</strong> <strong>simple</strong>. Une différ<strong>en</strong>ce <strong>de</strong> 38% au maximum <strong><strong>de</strong>s</strong> résistances <strong>en</strong><br />

<strong>compression</strong> <strong>en</strong>tre ces 2 types d'échantillons a été observée. Par ailleurs, l'application <strong>de</strong> la formule <strong>de</strong> l'Euroco<strong>de</strong> 6 (EC6)<br />

relative aux maçonneries conv<strong>en</strong>tionnelles conduit, d'une manière générale, à la sous estimation <strong>de</strong> la résistance <strong>en</strong><br />

<strong>compression</strong> <strong><strong>de</strong>s</strong> maçonneries BTC par rapport aux valeurs expérim<strong>en</strong>tales. Les rapports <strong>en</strong>tre la résistance à la rupture<br />

calculée par la formule EC6 et la valeur expérim<strong>en</strong>tale vari<strong>en</strong>t <strong>en</strong>tre 44 et 72%.<br />

MOTS-CLES : Blocs <strong>de</strong> <strong>terre</strong> <strong>comprimée</strong> (BTC), <strong>compression</strong> <strong>simple</strong>, fissuration, mortier <strong>de</strong> <strong>terre</strong>, flexion, stabilisation,<br />

rupture, homogénéisation, modélisation, essai à l'échelle 1, essai in situ, maçonnerie, <strong>terre</strong> crue.<br />

Laboratoire (s) <strong>de</strong> recherches : Laboratoire Géomatériaux du Départem<strong>en</strong>t Génie Civil et Bâtim<strong>en</strong>t URA 1652 <strong>de</strong> l'Ecole<br />

Nationale <strong><strong>de</strong>s</strong> Travaux Publics <strong>de</strong> l'Etat (ENTPE)<br />

Directeurs <strong>de</strong> thèse: Messieurs Hervé DI BENEDETTO<br />

Jean Clau<strong>de</strong> MOREL<br />

Présid<strong>en</strong>t <strong>de</strong> jury : Monsieur le Professeur Bernard BAROUX<br />

Composition du jury :<br />

Jean Marie REYNOUARD, Pierre FORAY, Normando P. BARBOSA, Ali MESBAH, Myriam OLIVIER, Vinc<strong>en</strong>t<br />

RIGASSI


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4e<br />

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σ<br />

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ý<br />

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Å ƒZYmq È


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Str<strong>en</strong>gth calculated from "3 points b<strong>en</strong>ding test"<br />

(MPa)<br />

8<br />

7<br />

6<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

Compression str<strong>en</strong>gth<br />

mo<strong>de</strong>l<br />

b<strong>en</strong>ding/traction mo<strong>de</strong>l<br />

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R 2 = 0,9674<br />

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R 2 = 0,9366<br />

0 1 2 3 4 5 6 7 8 9 10<br />

Compression str<strong>en</strong>gth from direct <strong>compression</strong> test (MPa)<br />

ƒZYmX


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elπ<br />

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σ tif<br />

σ tieb<br />

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c<br />

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t<br />

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t ^`_ t y<br />

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ɛ xb = σ xb<br />

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E b22<br />

ν 13 − σ 2<br />

E b22<br />

ν 12<br />

NP±;WIÀVU


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ɛ zb = σ zb<br />

E b22<br />

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E b22<br />

ν 31 − σ 2<br />

E b22<br />

ν 32<br />

NP±;Wv U<br />

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ɛ xm = 1<br />

E m<br />

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ɛ zm = 1<br />

E m<br />

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NP±;W· U<br />

ɛ zb = ɛ zm<br />

NP±;W› U


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s<br />

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NP±;Wš U<br />

F zb + F zm = 0<br />

NP±;Wn U<br />

σ xm = −ασ xb<br />

NP±;Wm U<br />

σ zm = −aσ zb<br />

NP±;WIÀ ¾ U<br />

α = S b<br />

S<br />

45Ê<br />

m<br />

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S<br />

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σ xb = ( ν 13<br />

E b22<br />

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E m<br />

)σ zb + ( ν 12<br />

1<br />

E b11<br />

+ α<br />

E m<br />

E b22<br />

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E m<br />

)σ2<br />

NP±;WIÀCÀVU<br />

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σ xb = ( 1<br />

E b22<br />

+ a<br />

E m<br />

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ν 31<br />

E b11<br />

+ ανm<br />

E m<br />

E b22<br />

+ νm<br />

E m<br />

)σ2<br />

NP±;WIÀ v U<br />

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σ zb = K zb σ 2<br />

NP±;WIÀ y U<br />

±ÈB‘#2'<br />

K zb =<br />

α<br />

A (ν 32 + ν m ν 12 ) + νm B (1 + ν 13) − 1 C (ν 32 + ν 31 ν 12 ) + α νm D (ν m + 1)<br />

−α<br />

A (ν 31ν m − 1) + a B (−1 + ν 31ν m ) + 1 C (ν 13ν 31 − 1) + a α D (ν2 m − 1)<br />

NP±;WIÀÁ1U


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σ<br />

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xm σ<br />

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zm<br />

E b<br />

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À mC¾<br />

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±;$[L0_L0|<br />

A = E<br />

[<br />

b22 E m<br />

B = E<br />

[<br />

b11 E m<br />

C =<br />

[<br />

E b11 E b22<br />

D = Em<br />

2 [<br />

σ xb = K xb σ 2<br />

NP±;WIÀ · U<br />

@2B‘#2'<br />

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E b22<br />

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E m<br />

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1<br />

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+ α<br />

E m<br />

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)<br />

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σ<br />

—1)€+"45"%>#<br />

zb = 0 UX¿@DH*4569%<br />

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− νm<br />

E m<br />

)<br />

E b<br />

1<br />

E b<br />

+ α<br />

E m<br />

NP±;WIÀ š U


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cif<br />

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tif σ tieb<br />

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