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Many research studies have shown that bridges are vulnerable to earthquakes,\udgraphically confirmed by incidents such as the San Fernando (1971 USA),\udNorthridge (1994 USA), Great Hanshin (1995 Japan), and Chi-Chi (1999 Taiwan)\udearthquakes, amongst many others. The studies show that fragility curves are\uduseful tools for bridge seismic risk assessments, which can be generated\udempirically or analytically. Empirical fragility curves can be generated\udwhere damage reports from past earthquakes are available, but otherwise,\udanalytical fragility curves can be generated from structural seismic response\udanalysis. Earthquake damage data in Turkey are very limited, hence this study\udemployed an analytical method to generate fragility curves for the Alasehir\udbridge. 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 30 m truss\udspans with a total span 189 m supported by 2 abutments and 5 truss piers,\ud12.5, 19, 26, 33, and 40 m. Sap2000 software was used to model the Alasehir\udbridge, which was refined using field measurements, and the effect of 60 selected real earthquake data analyzed using the refined model, considering\udmaterial and geometry nonlinearity. Thus, the seismic behavior of Alasehir\udrailway bridge was determined and truss pier reaction and displacements were\udused to determine its seismic performance. Different intensity measures were\udcompared for efficiency, practicality, and sufficiency and their component\udand system fragility curves derived

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