Vibration Analysis of Light Rail Transit Bridges Using MIDAS Civil: A Case Study of Two Bridges for the Edmonton Valley Line West Project

On elevated LRT guideways, ride quality depends on how the structure responds. Mohammad will walk through a practical train-track-bridge-soil interaction (TTBSI) model built in midas Civil and how it was applied to two key bridges on Edmonton's Valley Line West: the Stony Plain Road Bridge and the Anthony Henday Drive Bridge. You'll see how vertical accelerations in the vehicles and on the bridge deck are predicted and checked against Eurocode passenger-comfort criteria, and how to bring vibration analysis into your own LRT bridge design work.

API, Python, and Iterative Response Spectrum Analysis in Civil NX

A practical look at running midas Civil NX through its API and Python, with worked examples you can apply to your own projects. Mahesh will also go through what's new in the latest updates, including CSA S6:25. Response spectrum analysis can't run with nonlinear springs. So you run it, read the displacements, update every spring by hand, and run it again. That takes several rounds to converge one case, repeated for every load case. Civil NX now runs that loop for you. You set a tolerance, click run, and it recalculates secant stiffness from the p-y curve until the change falls inside it. In this hour we build p-y springs from borelogs, run the iterative response spectrum analysis live, and check the converged stiffness against a hand iteration, step for step.