Curved Girder LRFR Rating Example

Question:
Hello Tech support,
Can you please provide me with some examples on Horizontally curved girder LRFR Load Rating Example. Also, do you have any documentation or example how to apply centrifugal forces? I saw online that this is included in Midas Civil for Eurocode, any such feature for AASHTO LRFD.
This is for Load Rating Purposes and not Design.
Thank you!


Answer: Hello User,
Thanks for writing to us.

1) For Bridge load rating check out this interesting video: http://northamerica.midasuser.com/web/e-learning/reviewing-courses-detail.php?sec=9488
PFA the tutorial and corresponding curved steel composite bridge model.

2) Centrifugal forces from moving load feature is currently available only for Eurocode, for AASHTO, we need to manually apply. See below FAQ.

Currently, it isn't possible to automatically assign the centrifugal force for AASHTO live load code. However, this can be done manually. The steps to be followed are as below:
1) Convert the moving load into static load using the moving load tracer feature, for the vehicle position where centrifugal force is to be assigned.

2) Copy the content of the generated text file

3) Go to Tools>MCT Command Shell and paste the content in the dialogue box

4) Hit Run. This will create a new static load case.

5) Obtain the load position from the element table for the axle loads

6) Calculate the centrifugal force to be applied manually and apply that with required eccentricity.

With this, the centrifugal load application is done and now this static load case could be checked with centrifugal force effects. The demo model file is also attached.


Files:
Demo.mcb

kindly reply back if you have any further issues.
Regards,
Creation date: 10/30/2017 1:59 AM ()      Updated: 10/30/2017 11:31 AM ()
Files   
Bridge Load Rating_Tutorial.pdf
resend
Bridge_Load_Rating_1478706816.pdf
resend
Curved_Steel_Composite_Load_Rating_1478706822.mcb
resend