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• W642508045 abstract "The present thesis comprises a case study of the risk of fatigue of the railway bridges chaining between Stockholm Central Station and the district Soeder Maelarstrand. A large number of fatigue-related cracks in the bridges at Soederstroem and Soeder Maelarstrand have been known for a long time. During a capacity assessment of the current bridges, a large number of connections have been identified as critical concerning fatigue resistance. The route is the most frequent in all of Sweden and the simplified methods of fatigue assessment defined by Banverket may not always be applicable. A conventional capacity assessment has shown numerous exceeds in fatigue resistance, using the stated safety margins. No fatigue cracks have been identified at the locations showing the largest theoretical risk of fatigue, in spite of extensive investigations. The conventional calculations are based on a uniform stress collective and a fixed number of stress cycles, independent of the actual traffic volume. According to the regulations stated by Banverket, the assessment may optionally be performed using historical data of the gross tonnage and standardised traffic loading. Such calculations have been undertaken and show even greater risk of fatigue, compared to the conventional assessment. To estimate the risk of fatigue in more detail, a method has been used, based on estimations of the real traffic volume and its distributions. The analysis is based on available data of the traffic volume and may be applied to other railway bridges on other locations. Besides theoretical analyses, field measurements have been performed. In 2006, former Carl Bro AB carried out strain gauge measurements on the bridge passing Soeder Maelarstrand and the viaduct south of Soeder Maelarstrand. The measurements comprised a small amount of individual train passages. During 2008, the division of Structural Design and Bridges at KTH performed an extensive field measurement programme on the bridge passing Soederstroem. Continuous measurements collecting data of all traffic during a period of one month was performed (A). Http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9898." @default.
• W642508045 created "2016-06-24" @default.
• W642508045 creator A5054147588 @default.
• W642508045 date "2009-01-01" @default.
• W642508045 modified "2023-09-27" @default.
• W642508045 title "Fatigue analysis of railway bridges: a case study of steel bridges in Stockholm based on theoretical analyses and strain measurements" @default.
• W642508045 hasPublicationYear "2009" @default.
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