Ingegneria e Contracting . gures 2 e 3 offrono vedute dei principali e approachspans di una autostrada ponte di arco di costruzione della nervatura builtover il fiume Moselle Noveant vicino nel 1907-8. Thisstructure è un eccellente esempio di combinazione oflightness, grazioso e linee di trattamento artistico di Euro-comitato ponti ad arco. L'arco principale si estende sono 154 ft., 131ft. e 108 ft. lungo, mentre l'approccio campate sono circa47 ft, 42 ft e 39 ft. lungo. Ciascun intervallo è costituito offour estremità fissa arch nervature a sezione rettangolare, thosein tre campate principale essendo unite insieme da un con-tinuous lastra arcuata, framin

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Engineering and Contracting . gures 2 and 3 give views of the main and approachspans of a highway arch bridge of rib construction builtover the River Moselle near Noveant in 1907-8. Thisstructure is an excellent example of the combination oflightness, graceful lines and artistic treatment of Euro-pean arch bridges. The main arch spans are 154 ft., 131ft. and 108 ft. long, while the approach spans are about47 ft., 42 ft. and 39 ft. long. Each span is made up offour fixed end arch ribs of rectangular section, thosein the three main spans being joined together by a con-tinuous arched slab, framing into the bottom portion ofribs at the springing line and gradually rising, thus pro-viding T-beam ribs to resist the bending moments inducedin the arches and also stiffening the structure laterally. Continuous girder spans are used quite often in Eu-rope for highway bridges of span lengths which would notbe considered economical in American practice. The December 27, 1916Vol. XLVI. o.26 577 ?:t:i-;J.a-;-h^gi-f-^ ^ ^-^1=i. Examples of European Concrete Bridge Designs. methods of design, however, take advantage of the con-tinuous action developed in a number of spans and as aresult girder spans of over 50-ft. are not uncommon. In Fig. 4 is shown a single span highway bridge overthe Moselle River at Moulin-Metz built in 1905, whichconsists of four fixed-end girders of 68 ft. 10 in. span, the under sides of girders being curved to give the bridgethe appearance of an arch. A 2-span continuous girder bridge supported on con-crete piles is pictured in Fig. 5. This bridge is locatedat Ratsamhausen. In this particular structure, makinga fairly low crossing of the stream, the girders were notarched but made straight with heavy fillets at the centerpier and abutments. The structure shown in Fig. 6 is located at Kreis-Schlettstadt, Germany. It is made up of four continuousgirder spans, the girders having variable moments ofinertia, being rigidly framed to elastic piers resting onconcrete

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• bookpublisherchicago
• bookyear19