. Iron truss bridges for railroads. Methods of calculating strains, with a comparison of the most prominent truss bridges, and new formulas for bridge computations; . upport to the ends of the Top Chord, and the principle of the counter-balancing of equal weights similarly situated will be observed. Assume a weight at m, and trace the strains developed by it. It is at once resolvedinto components along Hm produced, and Am produced. The one along Hm generatesa tension at m, acting towards a, equal to |- X tt ^ The one along A m generates atension at m, acting towards r, equal to V X iV ^ The re
. Iron truss bridges for railroads. Methods of calculating strains, with a comparison of the most prominent truss bridges, and new formulas for bridge computations; . upport to the ends of the Top Chord, and the principle of the counter-balancing of equal weights similarly situated will be observed. Assume a weight at m, and trace the strains developed by it. It is at once resolvedinto components along Hm produced, and Am produced. The one along Hm generatesa tension at m, acting towards a, equal to |- X tt ^ The one along A m generates atension at m, acting towards r, equal to V X iV ^ The resultant tension at m istherefore ^W acting towards r. The component along H m produced generates atension of \^ IFX ^ Vl3 on mif, n 0, o P, p Q and q H. It generates a compressionequal to ^ TF on iV», 0 o, Pp, Q q and P r. It generates a compresssion equal toIXIT^ on IfM, ON, P 0, QP and P Q, the compressions accumulating from theright towards M. It generates a tension on nm, o n, po and q p, equal to f X tt ^the tensions accumulating towards m. On r q there is no tension, as the force comingdown Br IS directly neutralized by the resistance of the abutment cb ^ Kl
Size: 904px × 2765px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyo, bookyear1870
