6. Moving Load - Two-span Bridge


The Demo Example number 6. Moving Load - Two-span Bridge has a THA - Time History Analysis of a Moving Load for a very simplified structure including damping. The structural system simulates a steel composite two spans bridge and Rayleigh-Damping coefficients are used. Despite being a very simplified example, with the masses of the elements concentrated at the nodes, it shows the philosophy behind the use of TH - Time History for a Dynamic Analysis of moving masses.

The results are consistent with very tiny variations from theory, and they also exemplify the difference between a static load analysis and a dynamic load analysis in terms of displacements, as shown below.