Artistic bridge design: a systematic treatise on the design of modern bridges according to aesthetic principles by Tyrrell H. G. (Henry Grattan) b. 1867

Author:Tyrrell, H. G. (Henry Grattan), b. 1867
Language: eng
Format: epub, pdf
Tags: Bridges -- Design and construction
Publisher: Chicago, The Myron C. Clark Publishing Co

Brighton viaduct, are not so attractive as parallel curves, though the cost of bending is partly avoided. Some designers have even curved the sections between the panel points at an increased cost, in order to make a perfect outline. The same kind of web should be maintained throughout, rather than a combination of plate and open lattice, as in the Riverside arch

Fig. 77

at Cleveland. Plates are necessary and permissible at the ends, but should appear as minor features and not extend out to the quarter points.

Unsymmetrical arches are correct and acceptable when used for approach spans where the rising hillside necessitates a higher spring at the abutments than at the intermediate piers in the valley. But the semi-arch of the unsymmetrical span

ARTISTIC BRIDGE DESIGN

should be of the same form as the adjoining valley arch, as in the St. Sylvestre bridge, Switzerland. A violation of this requirement is found in the Rio Grande cantilever arch in Costa Rica, where no harmony is seen between the approach and center outline. The finest cantilever arch ever executed is the Viaur viaduct in France, though a similar one (Fig. 77) was proposed the same year to carry Massachusetts avenue over Rock Creek at Washington. A very beautiful small one crosses the Eibe-Trave canal at Molln, and another (Fig. 78) may be seen in Lincoln Park, Chicago.

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