How can I scale ground motion on SAP2000 (0.2g for example) ?

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Ahmed Ebid Popular answer

-Add new analysis case

-set analysis type "time history"

- set load type " accel"

- set function "your time history function"

- set scale factor = (req acc. / max acc.)

where req acc. is the (0.17 or 0.22) x 9.81, max. acc. is the maximum

acceleration from your time history data

see attached screenshot

regards

Ahmed Ebid

Fraser Dominic David

There are several ways to do this:

1. Through scaling the ground motion record using software such as SeismoSignal.

2. Through manually scaling the ground motion record by multiplying the scale factor, (Required PGA)/(Original PGA), to each point in the record. This can be done through Microsoft Excel.

3. Through application of the scale factor directly in SAP2000 as mentioned by Ahmed Ebid

Rakan Alalwan

Thanks you guys.

Could you how to know what is the current scale exactly?

Kind Regards.

Said Elias

In linear analysis you can follow the procedure given by Ahmed Ebid, but for nonlinear analysis you cannot follow that. In that case you need to do it by the help of MATLAB or Excel to change the data and then use them in the function.

Ali Akbar Shaikhzadeh

The method suggested by Ahmed Abid is simply called PGA scaling which is mostly used in linear analysis. However, there are many other ways of scaling accelerograms such as:

- scaling in time domain

- scaling in frequency domain (spectral matching) - recently added in v21 of SAP2000

- spectral matching by wavlets

Asad Naeem

Scale according to ASCE 7-16 that the average of the spectra from all the ground motion acceleration time histories does not fall below 71% of the target spectrum in the period range from 0.2T to 1.5T and then used that scaling factor in Sap 2000 to run the scaled time history.