Abstract：Research purposes： As the concrete filled steel tube structure of the railway bridge has the feature of big stress amplitude under the active load of train, the fatigue design is very important. However, there is no corresponding clause in the current design codes at home and abroad, so it is necessary to do the research on the fatigue design and experiment on the concrete filled steel tube of the railway bridge.
Research conclusions ： ( 1 ) Based on the actually measured impact coefficients of the bridge vibration tests of the concrete filled steel tube structures of three railway bridges，the suitable formula for calculation of the impact coefficients on such kind of bridge under the active load of train was got by fitting to ensure the calculation reliability of the stress amplitude under the active load. (2) The introduction was given to the geometric and physical technical parameters and stress concentration coefficient of the tube segment and the stipulation of classification the fatigue details. (3) The static test and fatigue test of the tube segment structure were conducted. Based on the analyses of the test data of the segment between tubes and tube segment, the simple and practical fatigue test methods for the segment between tubes and the tube segment were presented for the fatigue design of concrete filled steel tube structure of railway bridge. (4) This research result is available for the concrete filled steel tube structure of various bridges.
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2013, Vol. 30 
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