Dynamic Analysis - Moving Load Trains#
Introduction#
Welcome to the Dynamic Analysis - Moving Load Train tutorial.
In this tutorial we show the workflow for the dynamic analysis of railway bridges under moving loads, like for example described in EN 1991-2, section 6.4.6 or UIC CODE 776-2, section A.6.1.
We demonstrate the workflow on a simple single span concrete beam bridge.
We show how to calculate eigenfrequencies and display the mode shapes of the structure.
We explain how to define the load models (“load trains”) and conduct the analysis for the train passages.
As final point we show the postprocessing options to display and document the calculated results.
By the end of the tutorial, you should be able to:
Calculate eigenfrequencies and mode shapes of your structure
Define the load trains for the analysis
Conduct the dynamic analysis for the train passages
Postprocess the results (i.e. plot time histories, generate result envelopes)
Project Description#
In this tutorial we investigate a simple concrete beam bridge with a span length of 20m.
System
Bridge cross-section
System Generation#
In the following video we show you how to create the bridge model for this tutorial using our parametric, axis based modelling concept CABD.
Dynamic Eigenmode Analysis#
As starting point for the analysis we would like to know the eigenfrequencies and corresponding mode shapes of the structure. For this purpose we do a dynamic eigenmode analysis using the corresponding task.
Dynamic Moving Load Train Analysis#
Here we show how to set up the dynamic analysis of the train passages and how to postprocess and plot the results.
