## Principles of Economy in the Design of Metallic Bridges |

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### Common terms and phrases

anchorage angles arch-bridge arranged average back-struts beam becomes a minimum Bollman truss bolts bottom-chords bracing bridge built cable calculated cantilever cantilever-arch cantilever-bridge catenary caused cent centre chord-strains chords coefficient compression compression-members considered continuous girders curves deflections diagonals economical elastic limit end-posts equal equation erection experiments factor of safety feet long flange-plates floor floor-beams formula greater hard steel Hence horizontal length limiting span lineal foot masonry material maximum strain Medium Steel ments middle span millimetre moduli modulus of elasticity moment of inertia moments of flexure movable load Neville truss number of panels obtained panel-loads parabolic parallel chords permanent load piers Plate points posts pressure puddled iron redundant members riveted secondary strains shearing force square inch stiffening girders stiffness strain-length stringers structure struts supposed suspenders suspension-bridge tensile tension theory tion top-chords triangular truss truss-bridge ultimate strength varying depth vertical web-members weight Whipple truss wind wind-bracing wind-pressure

### Popular passages

Page 103 - Bridge a span of 1,710 feet, the ratio there, also is 1 to 3-65, hence, to enable anyone to appreciate the size of the Forth Bridge, we have merely to suggest the following simple rule of three sum: As a Grenadier Guardsman is to a new-born infant, so is the Forth Bridge to the largest railway bridge yet built in this country. Bridges a few feet larger in span than the Britannia have been built elsewhere, but they are baby bridges after all.

Page 103 - ... the process much, and obtain valuable positive results, if we confine our attention at first to the comparative weights of iron required in the different methods of constructing the superstructure, which, after all, is by far the most important element in determining the cost of a long-span bridge. The size of a bridge is very commonly the popular standard by which the eminence of its engineer is measured...

Page 3 - In the book now presented the error often fallen into namely, of treating the web-system and the chords of singlespan bridges separately or independently, has been avoided; and by multiplying the strain of each member of a fully loaded bridge of a fixed number of panels with the length of the member, and then adding the products, formulas were obtained which agree with American practice, and with the author's own experience of some eighteen years.