Dear all
I have a 2D steel frame that is subjected to nonlinear time history analysis.
7 acceleration records have been selected from the PEER and scaled to normal (1g) and then used for the analysis.
But unfortunately, no significant yielding has occurred in the frame's plastic hinges.
I am thinking that the PGA of my scaled record must not be sufficient to enforce hinges to yield.
A friend says that I have to multiply another g (=9.81) in my function.
Would you please teach me what is the right way?
Hi Ali Mirzaee
Scaling the records should be in accordance with the target hazard level. If the hazard level of interest is the spectral acceleration at the fundamental period, Sa(T1), which is equal to 1g (for example), then scale your records so that they have the same value at T1.
Regarding the units of the time history, it must be in m/s2, so after scaling you need to multiple by 9.81 if the record is originally given in g units.
I hope this helps
Dear Karim Aljawhari
Thank you so much
can you suggest any good tutorial reference?
I changed the beams or columns or even change the size of the loads.
But the plastic hinges do not form on the beams. I do not know the correct method of design and analysis and I am learning. Thank you very much if you help me find the cause.
Dear all
i need to know how to scale a time history record to a constant peak ground acceleration for example 0.15g not to a target response spectrum. is this applicable?
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