Response spectrum in Microstran

Hi all,

I amdoing a response spectrum analysis in Microstran for an highway underpass structure. After going through all the step which are static analysis, dynamic analysis and response spectrum, I should get the earthquake load automatically added into my primary load case. However I have nothing in the earthquake load. Anyone knows why? My Microstran version number is V9.20.3.3

Many thanks,

Tony

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  • Hi Tony,

    If done correctly, you don't see it as actual loads in the earthquake load case. But you should see analysis member actions  when the earthquake load case is selected for display (reactions, deflections, axial forces - should all be shown on screen with non-zero values).

    Does your structure have mass?

    Have you verified that you are able to see results with a simple 2 storey structure? Is the problem specific to your job file?

    If so, please send through to Wentao.zhang@bentley.com and I will take a close look.

    Regards,

    Wentao Zhang

Reply
  • Hi Tony,

    If done correctly, you don't see it as actual loads in the earthquake load case. But you should see analysis member actions  when the earthquake load case is selected for display (reactions, deflections, axial forces - should all be shown on screen with non-zero values).

    Does your structure have mass?

    Have you verified that you are able to see results with a simple 2 storey structure? Is the problem specific to your job file?

    If so, please send through to Wentao.zhang@bentley.com and I will take a close look.

    Regards,

    Wentao Zhang

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