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questions sur DDS


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je besoin ces questions s.v.p

1-définir le spectre de déplacement Sd,de pseudo-vitesse Sv et de pseudo-accélération Sa?

2-pourquoi la ductilité est elle importante dans le conception parasismique?

3-est-ce que le mode propre de vibration est un vecteur déplacement?

4-définir le spectre anélastique?


et merci d'avance ...................

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