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et on a :

(-+x)(-)-(+-10

[merged small][ocr errors]
[merged small][merged small][subsumed][subsumed][ocr errors][ocr errors][merged small][subsumed][ocr errors][merged small][subsumed]

Ordonnée du point de passage à la clef de la courbe de pression correspondant à un ensemble de forces quelconque

[blocks in formation]

C) Cas particulier où la fibre moyenne est une parabole :

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D) Rappel des notations, et formules donnant K, a et 3.
Équation de la fibre moyenne :

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Épaisseur e du joint incliné de 6o sur la verticale o < 4 < — ·

[blocks in formation]

e. Épaisseur à la clef;

Coefficient constant pour une même voûte;

7. Coefficient λ=;

u Abscisse de la foree P(u) comptée de l'axe de la voûte (et non des naissances); u est positif et inférieur à a.

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En terminant cette étude, je me fais un devoir d'adresser mes remerciements à mes collaborateurs de tout ordre qui se sont dépensés sans compter au cours des 'campagnes passées, dans des conditions matérielles souvent fort pénibles.

La haute direction des études et des travaux était assumée par M. l'Ingénieur en Chef Joyant, Directeur général Adjoint des Travaux publics et M. l'Inspecteur général Delure, Directeur général des Travaux publics, dont les conseils et les encouragements nous ont été précieux.

M. le Général Lyautey, Commissaire Résident général, a bien voulu manifester à plusieurs reprises l'intérêt qu'il portait à ces modestes essais qu'il veuille trouver ici l'expression du profond attachement d'un personnel qui s'est voué avec toute l'ardeur de son patriotisme à l'exécution de l'œuvre magnifique dictée par un chef compris, admiré et aimé.

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VALEURS DES FONCTIONS α (=) ET ẞ (=)

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