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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Probabilistic fatigue analysis of a post-weld treated tubular bridge
Bridges consisting of steel tubes welded together to form truss girders represent an industry trend that has received much recent attention from practicing engineers, code writing authorities, and researchers. The merits of these structures are cited in a number of references. One of their often cited weaknesses is the relatively poor fatigue performance of their joints. In this paper, several probabilistic models for evaluating the fatigue performance of post-weld treated tubular bridge structures are briefly described. The application of the models is then demonstrated on a full-scale example bridge. Under realistic traffic loading conditions, it is shown that a significant increase in fatigue performance can be obtained with post-weld treatment. In comparing several treatment strategies, a partial treatment strategy is presented, which results in the same fatigue performance improvement as full treatment with a fraction of the treatment effort. One potential concern with the use of post-weld treatment methods such as needle peening is that they may simply shift the critical crack site to an untreatable location such as the weld root. A deterministic verification of the weld root is presented. Although this verification shows that the adopted partial treatment strategy will not cause the critical crack location to shift to the weld root, further work is clearly needed to develop parametric equations for the R(ind.SCF) factor that are adapted to tubular joints with geometries typical of bridge structures. In addition, there may be value in modifying the weld root verification procedure so that phase effects can be more easily considered.
Probabilistic fatigue analysis of a post-weld treated tubular bridge
Bridges consisting of steel tubes welded together to form truss girders represent an industry trend that has received much recent attention from practicing engineers, code writing authorities, and researchers. The merits of these structures are cited in a number of references. One of their often cited weaknesses is the relatively poor fatigue performance of their joints. In this paper, several probabilistic models for evaluating the fatigue performance of post-weld treated tubular bridge structures are briefly described. The application of the models is then demonstrated on a full-scale example bridge. Under realistic traffic loading conditions, it is shown that a significant increase in fatigue performance can be obtained with post-weld treatment. In comparing several treatment strategies, a partial treatment strategy is presented, which results in the same fatigue performance improvement as full treatment with a fraction of the treatment effort. One potential concern with the use of post-weld treatment methods such as needle peening is that they may simply shift the critical crack site to an untreatable location such as the weld root. A deterministic verification of the weld root is presented. Although this verification shows that the adopted partial treatment strategy will not cause the critical crack location to shift to the weld root, further work is clearly needed to develop parametric equations for the R(ind.SCF) factor that are adapted to tubular joints with geometries typical of bridge structures. In addition, there may be value in modifying the weld root verification procedure so that phase effects can be more easily considered.
Probabilistic fatigue analysis of a post-weld treated tubular bridge
Walbridge, S. (Autor:in) / Nussbaumer, A. (Autor:in)
2006
8 Seiten, 10 Bilder, 1 Tabelle, 20 Quellen
Aufsatz (Konferenz)
Englisch
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