TRIPARTITE GRAPHS FOR RESPONSE SPECTRA 1

[AMaloff]

I'm trying to find a software that I can use to plot four-way logarithmic graphs (response spectrum). Right now I'm doing this by hand. In addition I'm trying to find a software to construct smoothed response spectra out of attenuation relationships

This will be used to construct plots for various site-to-source distances values an so on. If someone can provide me any assistance on this matter I will be very gratefull

Regards,

 

[ludvik]

do you have a copy of mathcad? i'm not sure whether it does four way log plots, but it has plenty of hardcore math and graphing functions. in fact, i'm not sure what a four way plot is...what is a tripartite graph? does excel not do enough? i though response spectrums where ploted on just a normal 2d logarithmic graph.

michael

 

[Taro]

A tripartite plot is a logarithmic spectral plot with one vertical and two diagonal axes from which you can read acceleration, velocity, or displacement for a given period. I don't know of commercial software that specializes in these plots. In grad school, I used Matlab to construct them.

 

[Qshake]

Yes, I've used MathCad to construct tripartite graphs as well. My references at the time were Geotechnical Earthquake Engineering by Steven Kramer and Structural Dynamics by Mario Paz.

 

[ishvaaag]

I thought I had posted an entry to thes question, seems lost, so I repeat... I have EQPACK by CASE Computer Aided Structural Engineering that makes RS plots..., and is part of a large set of programs to EQ related, so if not this may be other may serve to you. The one I have is DOS based.

Also, Qshake, have you posted anywhere such Matchcad sheet available? Could you if not? I have Mathcad 2000 Pro and would love to see it...graduating the diagonal logarithms must be cumbersome, no?

 

[JAE]

There is also a program called SHAKE and many others that does a lot of this. Try this website:

http://nisee.berkeley.edu/software_and_data/

 

[JAE]

Try this one also:

http://www.kalama.com/~gordonez/