I am not able to generate the moment envelope for my mat. When I click on the Generate Moment Envelope button nothing happens. What should I do ?

This may happen for certain specific shaped mats with irregular boundaries. If it does, here are the steps you need to follow to generate the moment envelope.

Go to the Longitudinal axis setup within the Envelope Generation dialog box. By default the longitudinal axis is set to Along Global X as shown next.

Choose ‘By Specifying coordinates’ option as shown next

Change ‘Starting Z’ and ‘Ending Z’ coordinates to the same non-zero value (this will still keep the longitudinal axis horizontal)

Ensure that you have chosen Use All Load Cases under Select load type as shown below

Click on Generate Moment Envelope. Moment envelope should now be generated