Greetings,
I'm uncertain about how to handle self-weight in time domain analysis of a structure subjected to a dynamic load. I am thinking of three possible approaches:
1) Disregard self-weight entirely.
2) Perform a static analysis considering self-weight as one of the loads, then use the resulting displacements as initial conditions for the dynamic analysis.
3) Treat self-weight as a dynamic load with a constant value, adding it to the dynamic load at each time step during the time history analysis.
I would like to determine the correct approach among these three options. Alternatively, if there's another method, I'd like to know about it.
Thank you.
Hi,
The second approach combined with the self-weight as a dynamic load with a constant value in subsequent dynamic analysis seems more natural.
Hi Victor,
Thank you for your answer. I eventually looked through some literature which indicated that I can consider the static (self-weight) and dynamic cases separately, then combine the responses, provided the materials involved stay within their elastic range. Would that be correct?
Hi Angel,
I think such superposition is correct at least for geometrically linear (small displacements) cases.
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