factor of earthquake acceleration in IDA

[aryo]

what should we assign for factor of earthquake in IDA in line: set accel "Series -dt 0.01 -filePath file.txt -factor [expr
> > ($gmf)*9.81]" ,I mean what number is good for 'gmf' and what step for increasing is suitable?

[etm]

it depends to your structure and ground motions under study
try large numbers first like 10 to 15, see if your structure collapse or not. I don't thing for available records and ordinary frames, larger number would be necessary. but for weak structures an scale factor about 4 can cause side collapse or large amount in story drift. after defining this factor, 50 steps would be enough for many purposes.

[aryo]

tnx etm, what should be the value of steps?

[etm]

if the collapse factor is for example $gmf=10 then 10/50=0.2 would be a good value for steps. 50 steps is enough I think.