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Barrage à contreforts - Cours de Génie Civil

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<strong>Barrage</strong>s en béton<br />

<strong>Barrage</strong>s <strong>à</strong> <strong>contreforts</strong><br />

Contraintes dans le le contrefort<br />

contraintes principales (sur les parements): lac plein<br />

σ<br />

σ I<br />

Ez<br />

=<br />

z ⋅ρE<br />

contraintes verticales<br />

tête amont<br />

⋅ g<br />

δ α<br />

σmin, am<br />

σmax,<br />

av<br />

y<br />

z<br />

gousset âme<br />

x<br />

σ I<br />

σ II<br />

σ II<br />

évtl. tête aval<br />

x<br />

σ<br />

σ<br />

σ<br />

σ<br />

max,<br />

min,<br />

min,<br />

z<br />

=<br />

( 2<br />

+ α)<br />

av = σz,<br />

av 1 tan<br />

( 2 ) 2<br />

+ tan α − σ ⋅ δ<br />

am = σz,<br />

am 1 Ez tan<br />

am ≥ 0 ⇒ σz,<br />

am ≥ σEz<br />

⋅ sin<br />

N<br />

A<br />

±<br />

M<br />

J<br />

y<br />

y<br />

⋅ x<br />

Laboratoire <strong>de</strong> Constructions Hydrauliques<br />

2<br />

δ<br />

ÉCOLE POLYTECHNIQUE<br />

FÉDÉRALE DE LAUSAN NE

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