Read e-book online Advanced Problems in Bridge Construction PDF

By G. Creazza, M. Mele

ISBN-10: 3211823182

ISBN-13: 9783211823187

ISBN-10: 3709126142

ISBN-13: 9783709126141

This quantity offers with the main smooth and topical difficulties of bridge layout. the themes provided permit to take on either theoretical-analytical in addition to technical-constructive points of the layout challenge, mentioning how when it comes to bridges, particularly for lengthy span bridges, the 2 facets are completely inseparable. In smooth bridges, purposes of technical and financial feasibility oblige an severe parceling of the development method, with the ensuing have to revise, with appreciate to the previous, either layout ideas in addition to the theoretical gear of study that governs it. All this may basically be derived from studying the current quantity, during which the various contributions pressure theoretical and technical questions of specific curiosity and topicality, with no claiming to technique them systematically, yet providing transparent procedural principles and development symptoms. just about the theoretical strategy, a few of specific value are reviewed, similar to the potential for utilizing restrict research, the simplification of the layout method for bridges, toughness, and machine aided layout. For what matters the bridge typologies and the corresponding optimistic difficulties, the emphasis is generally at the ones nonetheless in an evolutionary section, that's lengthy span suspended/stayed bridges and cantilever outfitted bridges with prefabricated segments.

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Extra resources for Advanced Problems in Bridge Construction

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1 Structural steel In some countries weathering steel is widely used: the reduction in maintenance costs is mostly higher than the increase in steel price. Fig. 1 shows as an application the elevation of the main span of the Napoltlon Bridge near Brig (outside girder). In the hogging moment region a high strength weathering steel with a yield stress of 41 0 N/mm2, made in Italy, has been used, allowing a reduction of the cross-sectional area of the flanges and of the corresponding welding labour.

25 1· ·1· "I [ml wLooding1 Loading 2 ~ JJJJll I I I i foldi"Jj I I I I I i 1. 1. 00 83 ~ d d + Fig. 4, Transverse load distribution for a composite bridge 59 Composite bridges The loading corresponds to the new Swiss Code SIA 160/1989. The decrease in girder bending, in comparison with a distribution according to the level principle, is of the order of 10% for the sagging moments. The corresponding torsional moments in the deck plate require generally no increase for the reinforcement. 3 Bridges curved in plane with open framing For curved bridges built some twenty years ago in Switzerland a closed framing was generally adopted, even for relatively high ratios of the radius of curvature to the span length.

Uf! crn~u4~~ ~: _, ~: -- i L- ' LOO .. 1~~ t 12~ ~ 1300 t Fig. 13. Cross section of the Skamsund Bridge in Norway with a central span of 530m. Referepees. : Cable-Stayed Bridges. Thomas Telford, London,1989. : Non-linear problems in Cable-Stayed Concrete Bridges. Lausanne September 1988. : Comportement et stabilite des tabliers minces dans les ponts haubanes. These de doctoral en cours de redaction a l'IBAP-EPFL. The behaviour and stability of cable stayed bridges with slender decks. PhD Thesis, in the process of completion at the Swiss Federal Institute of Technology, EPFL, Lausanne, Switzerland.

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Advanced Problems in Bridge Construction by G. Creazza, M. Mele


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