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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 1 | Copyright

Special issue: Damage of natural hazards: assessment and mitigation

Nat. Hazards Earth Syst. Sci., 18, 231-240, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Jan 2018

Research article | 18 Jan 2018

Seismic assessment of a multi-span steel railway bridge in Turkey based on nonlinear time history

Mehmet F. Yılmaz1,2 and Barlas Ö. Çağlayan1 Mehmet F. Yılmaz and Barlas Ö. Çağlayan
  • 1Department of Civil Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
  • 2Department of Civil Engineering, Ondokuz Mayıs University, Kurupelit 55139, Samsun, Turkey

Abstract. Many research studies have shown that bridges are vulnerable to earthquakes, graphically confirmed by incidents such as the San Fernando (1971 USA), Northridge (1994 USA), Great Hanshin (1995 Japan), and Chi-Chi (1999 Taiwan) earthquakes, amongst many others. The studies show that fragility curves are useful tools for bridge seismic risk assessments, which can be generated empirically or analytically. Empirical fragility curves can be generated where damage reports from past earthquakes are available, but otherwise, analytical fragility curves can be generated from structural seismic response analysis. Earthquake damage data in Turkey are very limited, hence this study employed an analytical method to generate fragility curves for the Alasehir bridge. The Alasehir bridge is part of the Manisa–Uşak–Dumlupınar–Afyon railway line, which is very important for human and freight transportation, and since most of the country is seismically active, it is essential to assess the bridge's vulnerability. The bridge consists of six 30m truss spans with a total span 189m supported by 2 abutments and 5 truss piers, 12.5, 19, 26, 33, and 40m. Sap2000 software was used to model the Alasehir bridge, which was refined using field measurements, and the effect of 60 selected real earthquake data analyzed using the refined model, considering material and geometry nonlinearity. Thus, the seismic behavior of Alasehir railway bridge was determined and truss pier reaction and displacements were used to determine its seismic performance. Different intensity measures were compared for efficiency, practicality, and sufficiency and their component and system fragility curves derived.

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This study focuses on the determination of seismic behavior and safety of specific bridges under seismic conditions. One of the nine intensity measures is selected considering practicality, efficiency, and proficiency. Component and system fragility curves are derived considering serviceability limits and component capacity. The results show that serves velocity limits has important effects on fragility curves of bridges and truss piers elements are the most vulnerable elements in the system.
This study focuses on the determination of seismic behavior and safety of specific bridges under...