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Title: Corrugated webs and lateral restraints in plate girders for bridges
Author: Cafolla, Janka
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1995
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In the thesis two problems have been studied: the first one is the use of corrugated webs in plate girders for composite bridges; the second one is the study of lateral restraints in composite bridges. In structural design corrugated webs are frequently used in beams for buildings in Sweden. They have also been used in four bridges in France and two in Japan. The shear stresses of corrugated panels were the main subject of previous studies. This thesis deals with local flange buckling of beams with corrugated webs. Computer analyses give a ratio of areas for use in design of the compressed flange. The validity of this ratio is confirmed by experimental work undertaken on five specimens (two of them loaded by bending only; three loaded by a combination of bending and shear). The interaction between the local buckling of the flange and web buckling is examined. A formula for calculating the effective shear modulus is given. The possible methods of fabrication of a cambered beam with a corrugated web are shown here and the problems which could arise are discussed. There is also a comparison between the design of an existing bridge and a new design where a plane web in a plate girder is replaced by a corrugated web. The second part of the thesis contains computational investigations of the lateral restraints in composite plate girder bridges. This method of investigation is more appropriate than laboratory testing, due to the difficulty of fabricating steelwork to maximum permitted imperfections. Numerical elastic finite element analyses with geometric non—linear facilities are used on a relevant part of the structure (a compressed flange) that has the maximum allowed geometric imperfections. The F— forces in elastic lateral restraints modelled by spring elements are then determined. This study concentrates particularly on design forces for bracings at the supports of simply—supported and continuous composite UB and plate girder bridges.
Supervisor: Not available Sponsor: Steel Construction Institute (Great Britain)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TA Engineering (General). Civil engineering (General) Civil engineering