{"id":5327,"date":"2022-05-02T11:30:31","date_gmt":"2022-05-02T11:30:31","guid":{"rendered":"https:\/\/bewehrungstechnik.ch\/?p=5327"},"modified":"2022-05-02T15:24:14","modified_gmt":"2022-05-02T15:24:14","slug":"regles-de-dimensionnement-pyrax","status":"publish","type":"post","link":"https:\/\/bewehrungstechnik.ch\/fr\/blog\/regles-de-dimensionnement-pyrax\/","title":{"rendered":"R\u00c8GLES DE DIMENSIONNEMENT PYRAX\u00ae"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>La t\u00f4le PYRAX<sup>\u00ae<\/sup> brevet\u00e9e, avec sa structure pyramidale en damier, a \u00e9t\u00e9 d\u00e9velopp\u00e9e pour transmettre des efforts tranchants biaxiaux transversalement et longitudinalement aux joints de reprise. La technologie PYRAX\u00ae en damier permet d&rsquo;obtenir une r\u00e9sistance \u00e9lev\u00e9e \u00e0 l&rsquo;effort tranchant d&rsquo;au moins 85% d&rsquo;un \u00e9l\u00e9ment en b\u00e9ton arm\u00e9 monolithique sans sollicitation de flexion. Le dimensionnement du joint PYRAX<sup>\u00ae<\/sup> est effectu\u00e9 \u00e0 l&rsquo;aide de la v\u00e9rification de la flexion et de l&rsquo;effort tranchant de la norme SIA 262.<\/strong><\/p>\n\n\n\n<p>Gr\u00e2ce \u00e0 la g\u00e9om\u00e9trie sp\u00e9cialement \u00e9chelonn\u00e9e, les joints r\u00e9alis\u00e9s avec la technologie PYRAX\u00ae atteignent une proportion nettement plus \u00e9lev\u00e9e de la surface de base de la denture par rapport \u00e0 la surface totale. De plus, la disposition en damier des pyramides permet d&rsquo;obtenir une transmission de l\u2019effort tranchant ind\u00e9pendant de la direction. La t\u00f4le PYRAX\u00ae est polyvalente et constitue la base de quatre variantes de produits diff\u00e9rents.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"base-de-dimensionnement-et-normes-applicables\">Base de dimensionnement et normes applicables<\/h5>\n\n\n\n<p>Le dimensionnement du joint PYRAX<sup>\u00ae<\/sup> s\u2019effectue selon les sp\u00e9cifications de la norme SIA 262 (2013) art. 4.3.2 et 4.3.3 sur la base des valeurs de flexion et de cisaillement.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0-940x1024.png\" alt=\"\" class=\"wp-image-5359\" width=\"622\" height=\"678\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0-940x1024.png 940w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0-275x300.png 275w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0-768x837.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0-436x475.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0-550x599.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-3D-Zeichnung_2.0.png 1008w\" sizes=\"auto, (max-width: 622px) 100vw, 622px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"has-black-color has-text-color wp-block-heading\" id=\"parties-d-ouvrage-sans-armature-de-cisaillement-dalles\">Parties d\u2019ouvrage SANS armature de cisaillement (dalles)<\/h3>\n\n\n\n<p>Le calcul de r\u00e9sistance au cisaillement s\u2019effectue selon SIA 262, art. 4.3.3.2. Les essais avec des bandes de dalles int\u00e9grant des t\u00f4les PYRAX<sup>\u00ae<\/sup> \u00e0 surface enti\u00e8rement profil\u00e9e n\u2019ont pas montr\u00e9 de diminution de la r\u00e9sistance au cisaillement en comparaison des bandes de dalles sans t\u00f4les.<\/p>\n\n\n\n<p>Le calcul des valeurs de cisaillement du joint PYRAX<sup>\u00ae<\/sup> s\u2019effectue donc avec <em><strong>\u03c4<\/strong><\/em><sub>cd,X<\/sub> = 1.0 <em><strong>\u03c4<\/strong><\/em><sub>cd<\/sub> ainsi que les facteurs <em><strong>k<\/strong><sub>d<\/sub><\/em> selon \u00e9q.(36)262 et <em><strong>k<\/strong><sub>g<\/sub><\/em> selon \u00e9q.(37)<sub>262<\/sub>. La hauteur<br>statique <em><strong>d<\/strong><\/em><sub>vX<\/sub> n\u00e9cessaire \u00e0 la reprise du cisaillement dans le joint se d\u00e9termine selon les Fig. 1 &amp; 2 en tenant compte des dimensions des t\u00f4les.<\/p>\n\n\n\n<p>La <em><strong>r\u00e9sistance au cisaillement<\/strong><\/em> d\u2019une dalle au droit du joint PYRAX<sup>\u00ae<\/sup> se d\u00e9termine donc par<\/p>\n\n\n\n<p><em><strong>v<\/strong><sub>Rd,X<\/sub> = <strong>k<\/strong><sub>d<\/sub> \u2219 <strong>\u03c4<\/strong><sub>cd,X<\/sub> \u2219 <strong>d<\/strong><sub>vX<\/sub> &nbsp;&nbsp;[kN\/m]&nbsp;&nbsp;<\/em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;                                                                     <\/p>\n\n\n\n<p class=\"has-text-align-right\">(35)<sub>262<\/sub><\/p>\n\n\n\n<p><em><strong><em><em><strong>\u03c4<\/strong><\/em><\/em><\/strong><sub>cd,X<\/sub> =1.0 <strong><em><em><strong>\u03c4<\/strong><\/em><\/em><\/strong><sub>cd<\/sub><\/em><br><em><strong>k<\/strong>d<\/em> : \u00e9q.(36)<sub>262<\/sub> ; avec <em><strong>k<\/strong>g<\/em> = 1.0 pour Dmax 32mm<br><strong>d<\/strong><sub>vX<\/sub> = hauteur statique du joint \u00e0 redans pour la<br>           transmission du cisaillement; <em><strong>d<\/strong><sub>vX<\/sub><\/em> \u2264 E                                                            (0)<sub>PYRAX<sup>\u00ae<\/sup><\/sub><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>en g\u00e9n\u00e9ral distance de l&rsquo;armature de traction aubord oppos\u00e9 de la t\u00f4le (Fig. 1).<\/li><li>en cas de largeur profil\u00e9e partielle de la section, seule peut \u00eatre prise en compte la largeur E de la t\u00f4le (Fig. 2).<\/li><\/ul>\n\n\n\n<p>Pour le calcul de <em><strong>r\u00e9sistance \u00e0 la flexion<\/strong><\/em>, c\u2019est la r\u00e9sistance du b\u00e9ton \u00e0 la compression <em><strong>f<\/strong><sub>cd<\/sub><strong> <\/strong><\/em>(non diminu\u00e9e) qui s\u2019applique dans la zone de compression.<\/p>\n\n\n\n<p><br><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h5 class=\"wp-block-heading\" id=\"remarques-pour-joint-au-droit-d-un-appui\">Remarques pour joint au droit d&rsquo;un appui<\/h5>\n\n\n\n<ul class=\"wp-block-list\"><li>Concernant l\u2019armature inf\u00e9rieure de la dalle dans la zone d\u2019appui, veuillez vous r\u00e9f\u00e9rer \u00e0 l\u2019Art. 5.5.3.3<sub>262<\/sub>.<\/li><li>Des joint PYRAX<sup>\u00ae<\/sup> sans armature c\u00f4t\u00e9 traction ne sont pas autoris\u00e9s.<\/li><\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-1.png\" alt=\"\" class=\"wp-image-5306\" width=\"251\" height=\"472\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-1.png 447w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-1-159x300.png 159w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-1-436x821.png 436w\" sizes=\"auto, (max-width: 251px) 100vw, 251px\" \/><figcaption><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-gray-dark-color\">Fig. 1<\/mark><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-2.png\" alt=\"\" class=\"wp-image-5308\" width=\"250\" height=\"471\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-2.png 447w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-2-159x300.png 159w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/Abb-2-436x821.png 436w\" sizes=\"auto, (max-width: 250px) 100vw, 250px\" \/><figcaption><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-gray-dark-color\">Fig. 2<\/mark><\/strong><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"has-black-color has-text-color wp-block-heading\" id=\"parties-d-ouvrage-avec-armature-de-cisaillement-murs-dalles\">Parties d\u2019ouvrage AVEC armature de cisaillement (murs, dalles)<\/h3>\n\n\n\n<p>Gr\u00e2ce au profil \u00e0 redans brevet\u00e9, la <em><strong>r\u00e9sistance au cisaillement<\/strong><\/em> du joint PYRAX<sup>\u00ae<\/sup> atteint 85% de celle d&rsquo;un b\u00e9ton monolithique. Cela peut \u00eatre pris en compte par la r\u00e9duction correspondante de la r\u00e9sistance du b\u00e9ton \u00e0 la compression dans la zone du joint, avec le facteur <em><strong>k<\/strong><sub>X<\/sub><\/em>. Pour le dimensionnement, la r\u00e9sistance du b\u00e9ton \u00e0 la compression dans le champ de contrainte est limit\u00e9 \u00e0 80 % avec le facteur <em><strong>k<\/strong><sub>X<\/sub><\/em>.<\/p>\n\n\n\n<p><em><strong>f<\/strong><sub>cd,X<\/sub> = <strong>k<\/strong><sub>X<\/sub> \u2219 <strong>f<\/strong><sub>cd<\/sub>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; avec <strong>k<\/strong><sub>X<\/sub> = 0.8<\/em><\/p>\n\n\n\n<p class=\"has-text-align-right\">(1)<sub> PYRAX<sup>\u00ae<\/sup><\/sub><\/p>\n\n\n\n<p>Pour le calcul de la <em><strong>r\u00e9sistance \u00e0 la flexion<\/strong><\/em> des zones d\u2019appui situ\u00e9es \u00e0 la verticale du joint, c\u2019est la r\u00e9sistance non diminu\u00e9e du b\u00e9ton \u00e0 la compression <em><strong>f<\/strong><sub>cd<\/sub><\/em> qui s\u2019applique.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"joint-avec-champ-de-contraintes-parralleles\">Joint avec champ de contraintes parrall\u00e8les<\/h5>\n\n\n\n<p>Le cisaillement se transmet par un champ de contraintes inclin\u00e9 avec la force de compression r\u00e9sultante <em><strong>F<\/strong><sub>cw<\/sub><\/em>. Sa composante verticale est en \u00e9quilibre avec l&rsquo;effort tranchant<strong><em> V<\/em><\/strong><em><sub>d<\/sub><\/em>, et sa composante horizontale avec l&rsquo;effort de<br>traction <em><strong>F<\/strong><\/em><sub><em>t,Vd<\/em> <\/sub>(Fig. 3).<\/p>\n\n\n\n<p>Avec des \u00e9triers verticaux, cette charge de traction donne :<br><em><strong>F<\/strong><sub>t,Vd<\/sub>= <strong>V<\/strong><sub>d<\/sub> \u2219 <strong>cot\u03b1<\/strong><sub><em><sub>x<\/sub><\/em><\/sub> &nbsp;&nbsp;[kN]     <\/em>                                                                                            <\/p>\n\n\n\n<p class=\"has-text-align-right\">(50)<sub>262<\/sub><\/p>\n\n\n\n<p>La <strong><em>r\u00e9sistance maximale au cisaillement<\/em><\/strong> dans le joint PYRAX<sup>\u00ae<\/sup> (murs, dalles) est limit\u00e9e dans le champ de contrainte par la r\u00e9sistance du b\u00e9ton <em><strong>k<\/strong><sub>c<\/sub> \u2219 <strong>f<\/strong><sub>cd,X<\/sub><\/em> \u00e0 (Fig. 3 (a))<\/p>\n\n\n\n<p>Murs:                                                                                                                            <br><em><strong>V<\/strong><sub>Rd,cX<\/sub> = <strong>b<\/strong><sub>w<\/sub> \u2219 <strong>z<\/strong> \u2219 <strong>k<\/strong><sub>c<\/sub> \u2219 <strong>f<\/strong><sub>cd,X<\/sub> \u2219 <strong>sin\u03b1<\/strong><sub>X<\/sub> \u2219 <strong>cos\u03b1<\/strong><sub>X<\/sub> [kN]<\/em><\/p>\n\n\n\n<p class=\"has-text-align-right\">(45)<sub>262<\/sub><\/p>\n\n\n\n<p>Dalles:                                                                                                                     <br><em><strong>v<\/strong><sub>Rd,<\/sub><em><sub>cx<\/sub><\/em> = <strong>z<\/strong> \u2219 <strong>k<\/strong><sub>c<\/sub> \u2219 <strong>f<\/strong><sub>cd<\/sub><em>,<sub>x<\/sub><\/em> \u2219 <strong>sin\u03b1<\/strong><sub>x<\/sub> \u2219 <strong>cos\u03b1<\/strong><sub>x<\/sub> [kN\/m]<\/em><\/p>\n\n\n\n<p class=\"has-text-align-right\">(2) <sub>PYRAX<sup>\u00ae<\/sup><\/sub><\/p>\n\n\n\n<p><strong>b<\/strong><sub>w<\/sub> = \u00e9paisseur du mur, au maximum l\u2019\u00e9paisseur profil\u00e9e <em>(bw \u2264 E)<\/em><br><strong>z<\/strong> = levier forces internes, <strong><em>au maximum la hauteur profil\u00e9e<\/em><\/strong> (z dalles \u2264 E resp. z murs \u2264 L)<br><strong>k<\/strong><sub>c<\/sub> = 0.55 resp. kc=0.40 en cas de d\u00e9formation plastique de la membrure tendue<br><strong>f<\/strong><sub>cd,X<\/sub> = <strong>k<\/strong><sub>X<\/sub> <em>\u2219<\/em> <strong>f<\/strong><sub>cd<\/sub> avec <strong>k<\/strong><sub>X<\/sub>=0.8, voir \u00e9q. (1)<sub>PYRAX<sup>\u00ae<\/sup><\/sub><\/p>\n\n\n\n<p><br><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>Les forces <em><strong>F<sub>t,Md<\/sub><\/strong><\/em> et <strong><em>F<\/em><\/strong><em><sub>c,Md<\/sub><\/em> se calculent au moyen du moment de flexion Md et du levier z :<\/p>\n\n\n\n<p><em><strong>F<\/strong><sub>t,Md<\/sub> = <strong>F<\/strong><sub>c,Md<\/sub>= <\/em><mathml>\\(\\frac{M_{d}}{z}\\)<\/mathml><em> [kN]<\/em><\/p>\n\n\n\n<p class=\"has-text-align-right\">(3) <sub>PYRAX<sup>\u00ae<\/sup><\/sub><\/p>\n\n\n\n<p>Dans le cas d\u2019un <strong><em>joint de mur<\/em><\/strong>, la force de traction <em><strong>F<\/strong><sub>t,Vd<\/sub><\/em> est usuellement reprise par l\u2019armature horizontale r\u00e9partie sur la hauteur z (Fig. 3(b)). La hauteur maximale z ne doit<br>pas d\u00e9passer la hauteur profil\u00e9e. Effort de traction r\u00e9parti :<\/p>\n\n\n\n<p><strong>n<\/strong><sub>t,Vd<\/sub> = <mathml>\\(\\frac{F_{t,Vd}}{z}=\\frac{V_{d}}{z}\\)<\/mathml><em> \u2219 <strong>cot\u03b1<\/strong><sub><em><sub>x<\/sub><\/em><\/sub> [kN\/m]<\/em><\/p>\n\n\n\n<p class=\"has-text-align-right\">(4) <sub>PYRAX\u00ae<\/sub><\/p>\n\n\n\n<p>Pour les <strong><em>joints de dalles<\/em><\/strong>, conform\u00e9ment aux sp\u00e9cifications de l\u2019Art. 4.3.3.4.12<sub>262<\/sub>, la force de traction <strong><em>F<\/em><\/strong><em><sub>t,Vd<\/sub><\/em><strong><em> <\/em><\/strong>est usuellement r\u00e9partie entre la membrure tendue et la membrure comprim\u00e9e \u00e0 raison d\u2019une moiti\u00e9 chacune (Fig. 3(c)). Les forces en r\u00e9sultant dans les membrures tendue et comprim\u00e9e sont donc les suivantes:<\/p>\n\n\n\n<p><em><strong>F<\/strong><sub>t<\/sub>=<\/em> <mathml>\\(\\frac{F_{t,Vd}}{2}=\\frac{|M_{d}|}{z}\\)  <\/mathml>                                                         <\/p>\n\n\n\n<p class=\"has-text-align-right\">(5a)<sub>PYRAX\u00ae<\/sub><\/p>\n\n\n\n<p><strong>F<\/strong><sub>c<\/sub>=<strong> <\/strong>&#8211; <mathml>\\(\\frac{F_{t,Vd}}{2}=\\frac{|M_{d}|}{z}\\) <\/mathml><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-primary-color\">   <\/mark>                                                              <\/p>\n\n\n\n<p class=\"has-text-align-right\">(5b)<sub>PYRAX\u00ae<\/sub><\/p>\n\n\n\n<p>Pour un moment de flexion faible ou n\u00e9gligeable, la charge <strong><em>F<\/em><\/strong><em><sub>c<\/sub><\/em> peut devenir n\u00e9gative (charge de traction), ce qui requiert, l\u00e0 aussi, une armature.<\/p>\n\n\n\n<p>Section d\u2019armature n\u00e9cessaire :<\/p>\n\n\n\n<p><strong>A<\/strong><sub>sX<\/sub> = <mathml>\\(\\frac{F_{t}}{f_{sd,X}}\\)<\/mathml> [mm<sup>2<\/sup>]<\/p>\n\n\n\n<p><strong>a<\/strong><sub>sX,Vd<\/sub> = <mathml>\\(\\frac{n_{t,Vd}}{f_{sd,X}}\\)<\/mathml><em> [mm<sup>2<\/sup>\/m]<\/em><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-primary-color\"><em> <\/em>  <\/mark>                                                                   <\/p>\n\n\n\n<p class=\"has-text-align-right\">(6)<sub>PYRAX\u00ae<\/sub><\/p>\n\n\n\n<p><em><strong>f<\/strong><\/em><sub><em>sd,X<\/em> <\/sub>= valeur de dimensionnement de l\u2019armature PYRAX<sup>\u00ae<\/sup><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"506\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3-1024x506.png\" alt=\"\" class=\"wp-image-5321\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3-1024x506.png 1024w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3-300x148.png 300w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3-768x379.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3-436x215.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3-550x272.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAX-Dok_Abb.3.png 1502w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-gray-dark-color\">Fig. 3<\/mark><\/strong><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h5 class=\"wp-block-heading\" id=\"joint-au-droit-d-un-appui\">Joint au droit d&rsquo;un appui<\/h5>\n\n\n\n<p>Pour un joint PYRAX<sup>\u00ae<\/sup> dans la zone d\u2019un appui dans des parties d\u2019ouvrage avec armature de cisaillement (Fig.4, appui direct) c\u2019est l\u2019Art. 4.3.3.4.1<sub>262<\/sub> qui s\u2019applique. La v\u00e9rification de l\u2019effort tranchant s\u2019effectue \u00e0 la distance <em><strong>z\u2022cot<\/strong>\u03b1<\/em> du bord de l\u2019appui selon l\u2019\u00e9quation (45)<sub>262<\/sub> avec la r\u00e9sistance du b\u00e9ton <strong><em>f<\/em><\/strong><em><sub>cd,X<\/sub><\/em> .<\/p>\n\n\n\n<p>La charge de traction <strong><em>F<\/em><\/strong><em><sub>t,Vd<\/sub><\/em> dans le joint se d\u00e9termine \u00e0 l\u2019aide de l\u2019inclinaison de l\u2019axe <strong><em>\u03b1<\/em><\/strong><sub>Xa<\/sub> de l\u2019\u00e9ventail centr\u00e9 sur la ligne d\u2019appui (Fig. 4).<\/p>\n\n\n\n<p>Dans la coupe transversale du joint, la force de traction <em><strong>F<\/strong><\/em><sub><em>t,Vd<\/em> <\/sub>agit sur le point d\u2019intersection de l\u2019axe de l\u2019\u00e9ventail. De mani\u00e8re simplifi\u00e9e, <strong><em>F<\/em><\/strong><em><sub>t,Vd<\/sub><\/em> est enti\u00e8rement attribu\u00e9 \u00e0 la<br>membrure inf\u00e9rieure et la v\u00e9rification de l\u2019armature est par cons\u00e9quent effectu\u00e9e directement sur la section del\u2019appui <strong>A<\/strong>. Lorsque seule une partie de la section du joint<br>est profil\u00e9e, il faut tenir compte du champ de contraintes en cons\u00e9quence.<\/p>\n\n\n\n<p>La zone situ\u00e9e \u00e0 l\u2019arri\u00e8re de l\u2019appui requiert une attention particuli\u00e8re. L\u2019espace disponible pour les bielles de compression et l\u2019ancrage de l\u2019armature doivent \u00eatre v\u00e9rifi\u00e9es. Pour la d\u00e9termination des dimensions des bielles et de la largeur d\u2019appui <strong><em>a<\/em><\/strong><sub>x<\/sub>, c\u2019est la r\u00e9sistance du b\u00e9ton <strong><em>f<\/em><\/strong><em><sub>cd<\/sub><\/em> qui s\u2019applique.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04-1024x648.png\" alt=\"\" class=\"wp-image-5330\" width=\"673\" height=\"425\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04-1024x648.png 1024w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04-300x190.png 300w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04-768x486.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04-436x276.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04-550x348.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-04.png 1324w\" sizes=\"auto, (max-width: 673px) 100vw, 673px\" \/><figcaption><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-gray-dark-color\">Fig. 4<\/mark><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h5 class=\"wp-block-heading\" id=\"angle-du-champ-de-contraintes-\u03b1x-resistance-au-cisaillement-et-armature-de-raccordement\">Angle du champ de contraintes <strong><em>\u03b1<\/em><\/strong><sub>x<\/sub>, r\u00e9sistance au cisaillement et armature de raccordement<\/h5>\n\n\n\n<p>L\u2019angle du champ de contraintes <em><strong>\u03b1<\/strong><sub>x<\/sub> <\/em>peut \u00eatre fix\u00e9 par l\u2019ing\u00e9nieur dans le cadre des valeurs limites de la norme SIA 262. Pour les joints de raccordement PYRAX<sup>\u00ae<\/sup>, on recommande<\/p>\n\n\n\n<p>2<em>5\u00b0 \u2264 <strong>\u03b1<\/strong><sub>x<\/sub> \u2264 65\u00b0   <\/em>                                                                                                      <\/p>\n\n\n\n<p class=\"has-text-align-right\">(7)<sub>PYRAX\u00ae<\/sub><\/p>\n\n\n\n<p><strong><em>\u03b1<\/em><\/strong><sub>x <\/sub>= angle perpendiculaire au joint du champ de contraintes<\/p>\n\n\n\n<p>La r\u00e9sistance au cisaillement <em><strong>V<\/strong><sub>Rd,cX<\/sub><\/em> resp. <strong><em>v<\/em><\/strong><em><sub>Rd,cX<\/sub><\/em> atteint son maximum pour l\u2019angle du champ de contrainte <em><strong>\u03b1<\/strong><\/em><sub>x<\/sub> = 45\u00b0 (Fig. 5, courbe grise).<\/p>\n\n\n\n<p>La section <strong><em>a<\/em><\/strong><em><sub>sX,Vd<\/sub><\/em> de l\u2019armature de raccordement n\u00e9cessaire selon l\u2019\u00e9q. (6)<sub>PYRAX<sup>\u00ae<\/sup><\/sub> diminue avec l\u2019augmentation de l\u2019angle du champ de contraintes <strong><em>\u03b1<\/em><\/strong><sub>x<\/sub> (Fig. 5, courbe bleue).<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-05.png\" alt=\"\" class=\"wp-image-5332\" width=\"711\" height=\"488\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-05.png 808w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-05-300x206.png 300w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-05-768x528.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-05-436x299.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/fr-Abb-05-550x378.png 550w\" sizes=\"auto, (max-width: 711px) 100vw, 711px\" \/><figcaption><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-gray-dark-color\">Fig. 5<\/mark><\/strong><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n      <p id=\"block_6214f3cd32bc0\" class=\"c-title mt-0 mb-6 lg:mb-17 alignwidetext-left l-block\"  >\n  \n  PYRAX\u00ae &#8211; Famille<\/p>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"has-text-align-center wp-block-heading\" id=\"pyarpan\">PYARPAN<sup>\u00ae<\/sup><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/bewehrungstechnik.ch\/fr\/product\/fers-de-reprise-pyratop\/\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRATOP-Coil-768x1024.png\" alt=\"\" class=\"wp-image-5363\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRATOP-Coil-768x1024.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRATOP-Coil-225x300.png 225w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRATOP-Coil-436x581.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRATOP-Coil-550x733.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRATOP-Coil.png 1008w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption>Fers de reprise avec haute reprise du cisaillement pour joints sans travers\u00e9es des armatures<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"has-text-align-center wp-block-heading\" id=\"pyrabar\">PYRABAR<sup>\u00ae<\/sup><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/bewehrungstechnik.ch\/fr\/product\/fers-de-reprise-vissables-pyrabar\/\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRABAR-Coil-768x1024.png\" alt=\"\" class=\"wp-image-5365\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRABAR-Coil-768x1024.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRABAR-Coil-225x300.png 225w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRABAR-Coil-436x581.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRABAR-Coil-550x733.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRABAR-Coil.png 1008w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption>Fers de reprise pour une haute reprise du cisaillement avec liaisons d\u2019armature \u00e9prouv\u00e9es BARTEC<sup>\u00ae<\/sup><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"has-text-align-center wp-block-heading\" id=\"pyrapan\">PYRAPAN<sup>\u00ae<\/sup><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/bewehrungstechnik.ch\/fr\/product\/paniers-darret-et-de-betonnage-pyrapan\/\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAPAN-Coil-768x1024.png\" alt=\"\" class=\"wp-image-5367\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAPAN-Coil-768x1024.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAPAN-Coil-225x300.png 225w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAPAN-Coil-436x581.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAPAN-Coil-550x733.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAPAN-Coil.png 1008w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption>Syst\u00e8me de coffrage avec haute reprise du cisaillement pour joints avec travers\u00e9e des armature<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"has-text-align-center wp-block-heading\" id=\"pyraflex\">PYRAFLEX<sup>\u00ae<\/sup><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/bewehrungstechnik.ch\/fr\/product\/tole-darret-de-betonnage-pyraflex\/\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAFLEX-Coil-768x1024.png\" alt=\"\" class=\"wp-image-5369\" srcset=\"https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAFLEX-Coil-768x1024.png 768w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAFLEX-Coil-225x300.png 225w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAFLEX-Coil-436x581.png 436w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAFLEX-Coil-550x733.png 550w, https:\/\/bewehrungstechnik.ch\/wp-content\/uploads\/2022\/02\/PYRAFLEX-Coil.png 1008w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><figcaption>Pour des joints de reprise flexibles avec travers\u00e9e des armatures<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Bases pour le dimensionnement en flexion et effort tranchant des joints PYRAX\u00ae selon la norme SIA 262<br \/>\n(2013) Art. 4.3.2 et 4.3.3<\/p>\n","protected":false},"author":12,"featured_media":5823,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[52],"tags":[],"class_list":["post-5327","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-engineering-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>R\u00c8GLES DE DIMENSIONNEMENT PYRAX\u00ae - Bewehrungstechnik<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bewehrungstechnik.ch\/fr\/blog\/regles-de-dimensionnement-pyrax\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00c8GLES DE DIMENSIONNEMENT 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