Mainshock-Aftershock Sequence IDA

[ssami]

Hi everybody

I want to perform IDA on a building under mainshock-aftershock sequence earthquake. In order to perform IDA for a mainshock-damaged building, a sequence of mainshock and aftershock records was entered into the model. For a given sequence of mainshock and aftershock records, the scale factor for a given mainshock response was unchanged while the intensity of the aftershock record was scaled until the model collapsed. So, in IDA process for mainshock-aftershock sequence, a nonlinear dynamic analysis is performed under a mainshock record and then several nonlinear analyses are carried out under aftershock records with different intensities (for example with scaled PGA from 0.1g to 1g with increments of 0.1g., i.e. 10 nonlinear dynamic analyses under aftershock records). Therefore My question is that is it possible to perform IDA analysis for a mainshock-damaged building in OpenSees without repeating mainshock analyses? In the other words, Is it possible to perform 10 analyses for a mainshock-damaged building under 10 aftershock records (with scaled PGA from 0.1g to 1g) without doing 10 analyses under same mainshock in OpenSees?

Thanks

[kengawk]

maybe the following commands can help

This command is used to save the state of the model in the database.
save $commitTag
$commitTag unique identifier that can be used to restore the state
at a later time

This command is used to restore the state of the model from the information stored in the database.
restore $commitTag
$commitTag unique identifier used to restore the state at the model when the
save command was invoked

[masoudahmadi]

Hi ssami,
Can you find best solution for doing IDA on a building under mainshock-aftershock sequence?
do you use proposed procedure by kengawk?

[sfsr]

Hello ssami,

Have you achieved your aftershock IDA analysis without repeating mainshock in Opensees? I met the same problem, could you give me some suggestion?

Thank you.