A multidisciplinary approach for fatigue assessment of a steel-concrete high-speed railway bridge on Sesia river

作者：Chellini Giuseppe^*; Lippi Francesco Vittorio; Salvatore Walter

来源：Structure and Infrastructure Engineering, 2014, 10(2): 189-212.

DOI：10.1080/15732479.2012.719527

• steel-concrete composite railway bridges
• experimental dynamic analysis
• long-term monitoring
• modal properties
• high-speed train traffic spectrum
• fatigue assessment

Steel-concrete composite bridge solutions have been more and more exploited in the new high-speed (HS) lines of European railway networks. New design solutions, introduced during a period of quick expansion for railway networks, amplified open problems related to dynamic effects, train-bridge interaction phenomena, fatigue loadings, structural modelling, fatigue life and comfort. In this article, results obtained by long-term dynamic monitoring of Sesia viaduct, a medium span double-box composite bridge of the new Italian HS network, are described and analysed. Structural modal properties were determined in order to evaluate the real-time dynamic behaviour and its correlation with environmental conditions. A suitable numerical procedure was then implemented in order to identify typology, length and velocity of trains crossing the bridge, to evaluate the intensity of deck vertical accelerations as a function of train speed and to obtain a reliable evaluation of real traffic spectra. A final fatigue assessment on welded connections was executed evaluating fatigue spectra by the aforementioned real traffic spectra and assuming S-N curves obtained by suitably executed experimental tests.

• 出版日期2014-2-1