Why G coefficients different?
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 Posts: 2
 Joined: Tue Oct 02, 2012 12:30 am
 Location: azad
Why G coefficients different?
Hi to all, I want to know which Why G coefficients different?
set accelSeriesx "Series dt 0.01 filePath SanFernando1.txt factor $g" ;
set accelSeriesx2 "Series dt 0.01 filePath 01SanFernandoPGA=1.226gdt=0.01N=4164.txt factor [expr (1.076/1.160)*$g*3]" ;
pattern UniformExcitation 2 1 accel $accelSeriesx ;
pattern UniformExcitation 3 2 accel $accelSeriesx2 ;
thanks.
set accelSeriesx "Series dt 0.01 filePath SanFernando1.txt factor $g" ;
set accelSeriesx2 "Series dt 0.01 filePath 01SanFernandoPGA=1.226gdt=0.01N=4164.txt factor [expr (1.076/1.160)*$g*3]" ;
pattern UniformExcitation 2 1 accel $accelSeriesx ;
pattern UniformExcitation 3 2 accel $accelSeriesx2 ;
thanks.
Re: Why G coefficients different?
just a scaling thing. ground motions can be scaled differently is user wants them to be, up to user.

 Posts: 2
 Joined: Tue Oct 02, 2012 12:30 am
 Location: azad
Re: Why G coefficients different?
Thank you very much professor Mckenna for your prompt response!
set iGMfile "HE01140 He12140" ; # groundmotion filenames, should be different files
set iGMdirection "1 2"; # groundmotion direction
set iGMfact "1.5 0.25"; # groundmotion scaling factor
.
.
.
ReadSMDFile $inFile $outFile dt; # call procedure to convert the groundmotion file
set GMfatt [expr $g*$GMfact]; # data in input file is in g Unifts  ACCELERATION TH
set AccelSeries "Series dt $dt filePath $outFile factor $GMfatt"; # time series information
pattern UniformExcitation $IDloadTag $GMdirection accel $AccelSeries ; # create Unifform excitation
}
But in this model, we see that the coefficient G is horizontal =1.5 and vertical=0.25.
in all of the models said coefficient g is variable.
why?
set iGMfile "HE01140 He12140" ; # groundmotion filenames, should be different files
set iGMdirection "1 2"; # groundmotion direction
set iGMfact "1.5 0.25"; # groundmotion scaling factor
.
.
.
ReadSMDFile $inFile $outFile dt; # call procedure to convert the groundmotion file
set GMfatt [expr $g*$GMfact]; # data in input file is in g Unifts  ACCELERATION TH
set AccelSeries "Series dt $dt filePath $outFile factor $GMfatt"; # time series information
pattern UniformExcitation $IDloadTag $GMdirection accel $AccelSeries ; # create Unifform excitation
}
But in this model, we see that the coefficient G is horizontal =1.5 and vertical=0.25.
in all of the models said coefficient g is variable.
why?

 Posts: 4
 Joined: Wed Jan 27, 2021 6:08 am
Re: Why G coefficients different?
dear sir, can you explain this scaling factor, I took the ground motion from ngawest2.berkeley.edu website. and I don't know how to get this scaling factor to fill in the model. When you said ''ground motions can be scaled differently'' , it means that the interval impacts of GM are different which different scaling or something? the GM that I took from that website is not changed, right?

 Posts: 4
 Joined: Wed Jan 27, 2021 6:08 am
Re: Why G coefficients different?
I'm so confused bcz the result'll be changed when I change the scaling. which the higher scaling factor the model will be collapsed.