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Exercício 3: Calcular as reacções nos apoios do pórtico ... - Dem Isep

Exercício 3: Calcular as reacções nos apoios do pórtico ... - Dem Isep

Exercício 3: Calcular as reacções nos apoios do pórtico ... - Dem Isep

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<strong>Exercício</strong> 3:<br />

<strong>Calcular</strong> <strong>as</strong> <strong>reacções</strong> <strong>nos</strong> <strong>apoios</strong> <strong>do</strong> <strong>pórtico</strong> representa<strong>do</strong> abaixo,<br />

construí<strong>do</strong> em aço (E=206 GPa), para os diferentes conjuntos de<br />

da<strong>do</strong>s indica<strong>do</strong>s na seguinte tabela:<br />

C<strong>as</strong>o H (m) L (m) I1 (cm 4 ) I2 (cm 4 ) I3 (cm 4 )<br />

(a) 5.0 3.0 5000 5000 5000<br />

(b) 2.0 6.0 5000 5000 5000<br />

(c) 2.0 6.0 100000 5000 100000<br />

(d) 2.0 6.0 5000 5000 100000<br />

Respost<strong>as</strong>:<br />

H (m)<br />

C<strong>as</strong>o Ax<br />

15 kN<br />

Ax<br />

(kN)<br />

B<br />

A<br />

I1<br />

Ay<br />

Ay<br />

(kN)<br />

MA<br />

L (m)<br />

(kN.m)<br />

Dx<br />

(kN)<br />

Dy<br />

(kN)<br />

MD<br />

(kN.m)<br />

(a) -15,00 -22,73 40,91 -15,00 22,73 40,91<br />

(b) -15,00 -3,33 20,00 -15,00 3,33 20,00<br />

(c) -15,00 -0,45 28,64 -15,00 0,45 28,64<br />

(d) -2,71 -0,69 3,52 -27,29 0,69 52,37<br />

I2<br />

Dx<br />

MA MD<br />

I3<br />

C<br />

D<br />

Dy<br />

15 kN


5 m<br />

2 m<br />

15<br />

15<br />

15<br />

15<br />

B<br />

A<br />

B<br />

A<br />

MA<br />

22,73<br />

3,33<br />

0,45<br />

0,69<br />

15<br />

40,91<br />

3 m<br />

(a)<br />

C<br />

D<br />

6 m<br />

(b)<br />

15<br />

15<br />

15 D 15<br />

20,00<br />

22,73<br />

(c)<br />

(d)<br />

40,91<br />

Forç<strong>as</strong> em kN<br />

Momentos em kN.m<br />

3,33<br />

C<br />

15<br />

20,00<br />

15 15<br />

28,64<br />

0,45<br />

15<br />

28,64<br />

2,71 27,29<br />

3,52<br />

0,69<br />

15<br />

52,37

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