Algorithm for scaling accelerogram (upon upload)
Posted: 09 Jul 2021, 13:15
Hello,
I am trying to understand how Seismosoft programs use scale factors in the dialog box when uploading accelerogram/s. My understanding is that the scale factors is literally just a constant multiplier to the time series, hence will just multiply each data point in the earthquake record. And since the accelerogram is then used in solving the ODE for a linear SDOF system, by virtue of linear operations, the resulting response spectra will also be scaled by the same constant multiplier.
However, when I tried to extract the scaled accelerogram after applying a scale factor, and then divided each data point by the corresponding ordinate from the original accelerogram, the multiplier actually varies with no discernable pattern.
What am I missing here? Please correct any misconceptions with the statements I've made above, and please expound on them as well. I really just want to understand how the algorithm works in SeismoMatch/Signal etc.
I am trying to understand how Seismosoft programs use scale factors in the dialog box when uploading accelerogram/s. My understanding is that the scale factors is literally just a constant multiplier to the time series, hence will just multiply each data point in the earthquake record. And since the accelerogram is then used in solving the ODE for a linear SDOF system, by virtue of linear operations, the resulting response spectra will also be scaled by the same constant multiplier.
However, when I tried to extract the scaled accelerogram after applying a scale factor, and then divided each data point by the corresponding ordinate from the original accelerogram, the multiplier actually varies with no discernable pattern.
What am I missing here? Please correct any misconceptions with the statements I've made above, and please expound on them as well. I really just want to understand how the algorithm works in SeismoMatch/Signal etc.