Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Fatigue design rules for steel bridges in Japan are based on design specifications that were established in 1960. Since then train speeds, travel time and the daily number of trains increased significantly. The formerly mentioned fatigue design standards establish allowable fatigue stresses. But occurrences of fatigue damage to bridges, for excample on the Tokaido Shinkansen network, were already first reported ten years after they were put into service. This include fatigue cracks in an orthotropic steel bridge deck of box section steel bridge in the Tokyo Metropolitan Expressway. The orthotropic steel deck is a structural member assembled by welding thin steel plate. Moreover, it is a member that directly support the wheel load. Therefore, the transverse distribution of vehicle positions, the number of repetitions of wheel load, the assembly accuracy, and the weld quality exert a significant influence on the occurence of fatigue damage. As various types of fatigue cracks initiated at many structural areas in the orthotropic steel deck structures of this bridge it is the aim of the present paper to clarify the causes of these cracks and examine possible retrofit methods. FEM analysis and field measurments were conducted to explain the mechanism of fatigue crack behaviour in through to deck plate connections, in butt welded joints through the ribs, in intersection of through ribs and cross-beams, in intersections of end diaphragm and through ribs as well as in cross-beams to main girder web-connections. With the support of the FEM analysis valuable indications should be drawn which can effectively ease further preventive maintenance work.
Fatigue design rules for steel bridges in Japan are based on design specifications that were established in 1960. Since then train speeds, travel time and the daily number of trains increased significantly. The formerly mentioned fatigue design standards establish allowable fatigue stresses. But occurrences of fatigue damage to bridges, for excample on the Tokaido Shinkansen network, were already first reported ten years after they were put into service. This include fatigue cracks in an orthotropic steel bridge deck of box section steel bridge in the Tokyo Metropolitan Expressway. The orthotropic steel deck is a structural member assembled by welding thin steel plate. Moreover, it is a member that directly support the wheel load. Therefore, the transverse distribution of vehicle positions, the number of repetitions of wheel load, the assembly accuracy, and the weld quality exert a significant influence on the occurence of fatigue damage. As various types of fatigue cracks initiated at many structural areas in the orthotropic steel deck structures of this bridge it is the aim of the present paper to clarify the causes of these cracks and examine possible retrofit methods. FEM analysis and field measurments were conducted to explain the mechanism of fatigue crack behaviour in through to deck plate connections, in butt welded joints through the ribs, in intersection of through ribs and cross-beams, in intersections of end diaphragm and through ribs as well as in cross-beams to main girder web-connections. With the support of the FEM analysis valuable indications should be drawn which can effectively ease further preventive maintenance work.
Mainaining and extending the lifespan of steel bridges in Japan
Miki, C. (Autor:in)
2003
21 Seiten, 30 Bilder, 1 Tabelle, 9 Quellen
Aufsatz (Konferenz)
Englisch
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