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0. . D " (3) PONTS 55 1 Mn = :J 1\1'0= (+ a"-IAn-IP MÉTALLIQUES +6n-IBn-IPI A POUTRES DROITES. OnP~-l+ Pn)+ + ("n-I + An-I)Mo. (n-J) (n) ("n + An)Mo' L'équation (n + 1) donnera ensuite; 1\10= 1 4(2"t'n +"A - ... -=- "tn-l )[(2An-An-l)a"P-(2B,,-Bn-l)bnP1+(2C,,-C,,_Ji'nP2=-A '"'' + (20" -1) n-l P"-I + P"J. (G') Nota. On prendra le signe + pour Pn quand le nombre des travées sera impair. Les. moments sur les points d'appui étant connus, on en déduira les efforts tranchants au moyen de la formule; Hn.

36 PONTS METALLIQUES A POUTRES d2y Équationde la troisièmetravée. . - . . . . TIF 1IIAXIlIlUl\1 DE LA TROISIÉME DROITES. 775x2 . 00; TRAVÉE. Équationde la cinquièmetravée. . . , . .. = 576, . 647 ~ - d2y E d~2 MOl\IENT NÉGATIF l\IAxIMtm DELA CiNQUlÉlIIETRAVÉE. 00; ~~oo--- HYPOTHÈsE N° 2. P-Ps . 40 - Sl1rchargedes travées nO'2, 4, 6 et $. 00; P2=P. 00. Équationde la deuxièmetravée. . . . ' .. MOMENT NÉGATIF NÉGATIF d2y dé. 00; = 634,755-H6,1l5x::j-2,77ox2. 00. MAXIl\lU1I1 DE LA DEUXIÉ1IIE TRAVÉE.

Le pont que noUs choisissons pour exemple de l'application de la formule (Si)est représenté dans la figure 6. - POi\TS MÉTALLIQUES 38 A POUTRES DHOITES. Figure 6. ,. l''~ Ol)IO

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Calcul des ponts metalliques by G. PIARRON DE MONDESIR

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