A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Steel plate reinforcement of orthotropic bridge decks
Orthotropic steel decks are used in most of the major long span bridges in the world where low dead-weight is an important factor. For the same reason, they are also largely used in movable bridges. In the past decades, severe fatigue cracks have been reported at several welded joints in orthotropic steel bridge decks. One of the main reasons for the fatigue problems is the low stiffness of the deck plate, which is insufficient to deal with the wheel loads of heavy traffic. Moreover, the increase of heavy traffic in the last decades makes the fatigue phenomena an even greater concern. This research investigates the reinforcement of orthotropic steel bridge decks (OBD) by adding a second steel plate to the existing deck. The main idea is to stiffen the existing deck plate which will reduce the stresses at the fatigue sensitive details and extend the fatigue life of the orthotropic bridge deck. Two reinforcement systems are subject of research, bonded steel plates system and sandwich steel plates system. In the bonded steel plates system, the existing OBD is reinforced by adding the second steel plate using a thin epoxy adhesive layer (approximately 2 mm thick). In the sandwich steel plates system, the existing deck is reinforced by adding a sandwich overlay which is composed of a polyurethane core (PU-core, from 15 mm to 30 mm thick) and the second steel plate. Both reinforcements are considered lightweight solutions (between 50 and 80 kg/m2), which is of special importance for application on movable bridges.
Steel plate reinforcement of orthotropic bridge decks
Orthotropic steel decks are used in most of the major long span bridges in the world where low dead-weight is an important factor. For the same reason, they are also largely used in movable bridges. In the past decades, severe fatigue cracks have been reported at several welded joints in orthotropic steel bridge decks. One of the main reasons for the fatigue problems is the low stiffness of the deck plate, which is insufficient to deal with the wheel loads of heavy traffic. Moreover, the increase of heavy traffic in the last decades makes the fatigue phenomena an even greater concern. This research investigates the reinforcement of orthotropic steel bridge decks (OBD) by adding a second steel plate to the existing deck. The main idea is to stiffen the existing deck plate which will reduce the stresses at the fatigue sensitive details and extend the fatigue life of the orthotropic bridge deck. Two reinforcement systems are subject of research, bonded steel plates system and sandwich steel plates system. In the bonded steel plates system, the existing OBD is reinforced by adding the second steel plate using a thin epoxy adhesive layer (approximately 2 mm thick). In the sandwich steel plates system, the existing deck is reinforced by adding a sandwich overlay which is composed of a polyurethane core (PU-core, from 15 mm to 30 mm thick) and the second steel plate. Both reinforcements are considered lightweight solutions (between 50 and 80 kg/m2), which is of special importance for application on movable bridges.
Steel plate reinforcement of orthotropic bridge decks
Stahlplattenverstärkung von orthotropen Brückendecks
Teixeira de Freitas, Sofia (author)
2012
249 Seiten, Bilder, Tabellen, 108 Quellen
Theses
English
Steel plate reinforcement of orthotropic bridge decks
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