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Does not add load to mass in frequency analysis

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sal21

sal21

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Dec 22, 2023
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Hi,
I will do frequency analysis on abaqus, but I have external loads. I define these before the frequency as static general Nonlinear on. I cannot see its effect on the mass. Loads are not included in the mass. How can I include loads in the total mass?
Thank you.
 
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Preloads affect natural frequencies but not through a significant change in mass - it's because of stress stiffening/softening effects.
 
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Thank you for your return.
 
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We are talking about preloaded modal analyses here - those that are preceded by a nonlinear static analysis and then the stress stiffening/softening effects can be considered during the natural frequency extraction.
 
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