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SYSTEME TRIANGULAIRE : Exercices
Domaine Professionnel Sous domaine Professionnel
Section Technique Option Mécanique
Discipline CONSTRUCTION METALIQUE Classe 6ème
Matériel didactique ferme d'une toiture Auteur SCHOOLAP.COM
Objectif opérationnel A la fin de la leçon, l'élève sera capable de trouver la grandeur, le sens d'effort dans une chaîne de barre.
Réference livre de graphostatique R Thibaut P. 71.
Activité initiale

RAPPEL

Citez les applications pratiques du système triangulaire ?

MOTIVATION

Dans un système triangulaire, quand est-ce-qu'une barre est soit tendue, soit comprimée ?

ANNONCE DU SUJET

Aujourd'hui, nous allons étudier les applications numériques du système triangulaire.

RAPPEL

Les applications pratiques du système triangulaire sont : les charpentes, les poutres et les polygones.

MOTIVATION

Dans un système triangulaire, une barre est soit tendue, soit comprimée lorsqu'elle tire ou pousse sur le noeud.

ANNONCE DU SUJET

Aujourd'hui, nous allons étudier les applications numériques du système triangulaire.

Activité principale

Comment trouve-t-on le sens d'effort dans un système triangulaire ?

Application numérique

Soit un système triangulaire représente à la figure ci-dessous est sollicité par les forces extérieures directement appliquées F1, F2, F3 et un équilibre sous les réactions RA et RB.Assertion 2

II. De cette même figure, les réactions aux appuis sont respectivement :

1. 2000N et  3000N                                         2. 2000N et 4000N               3. 2000N et 2000N                                     4. 3000N et 4000N      5. 3000N et 3000N.

Assertion 5

III. La barre 3 mesure :  

1.  4200N                           2. 2000N                                   3. 3000N                        4. 3400N                                     5. 2500N 

Assertion 3.

IV. Cette même barre 3 est sollicitée à la (au) :

1. cisaillement              2.  compression                  3. traction                        4. flexion                          5. torsion

assertion 2. 

V. le système triangulaire est:

1. Isostatique                   2. hyperstatique               3. hypostatique                  4. hyper et hypostatique            5. non symétrique 

Assertion 1

Synthèse

Qu'avons-nous étudier aujourd'hui ?

Aujourd'hui, nous avons fait les exercices sur le système triangulaire.

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