can anyone tell me in IDA analysis, increases the scale factor of ground motion from 0.1g and upto 5g. Why the drift ratio vs spectral acceleration curve show linear , even maximum hinges show collapse point.
Dear Ravinder Kumar
Most likely the problem is with the definition of the properties of plastic hinges.
Even though the structural acceleration may saturate, the existence pf plastic hinges will decrease the natural frequency and allow the structural displacement to keep increasing, and thus the srift ratio as well. Looking at the ratios structural acceleration / input PGA and drift ratio / structural acceleration could help in understanding what really happens in the model. The first one should decrease with increasing PGA, the second one might increase because of period lengthening.
Hello all dears
To do time history analysis in ETABS
I downloaded 7 acceleration records from the Peer site
and then I made the spectrum according to the rules and got the scale factors
I introduced it to Etabs software and did a time history analysis
but does not occur nonlinear hinges in beams and columns
I'm likely to make a mistake in scaling
when I Multiplied the acceleration in an extra g(=9.81) I find my goal. But I have to have a reason for my work
If I get a scaled acceleration that is correct and ready to use in Etabs
I can compare and find the problem.
please send me the scaled acceleration record that you used for time history analysis in Etbas.
Sincere thanks
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