When determining the appropriate step in the dynamic analysis of steel railway bridges under moving loads

In the analysis of structures under dynamic loads, select the time step is very important to obtain accurate esponses. Select the appropriate steps in order to study the dynamic analysis of railway bridges under a moving load is studied. Given the dynamic nature of moving loads, in this study the dynamic response of four steel bridge with craters 10, 15, 20 and 25 meters to the train speeds range from 100 to 400 kph and the axes 13 and 23 m, taking steps ظifferent when the analysis is calculated. had a larger selection. In this study, comparing the results of dynamic analysis with different time steps, the step of selecting an appropriate relationship for the dynamic analysis of bridges under moving loads is presented.