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RE: Signs for Response Spectrum Analysis[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'Daniel Popp'" <drp181(--nospam--at)yahoo.com>, <seaint(--nospam--at)seaint.org>
- Subject: RE: Signs for Response Spectrum Analysis
- From: "Josh Plummer" <joshp(--nospam--at)risatech.com>
- Date: Thu, 6 Aug 2009 09:38:29 -0700
Actually, in RISA the definition of a Dominant mode is totally left up to the user. The program never makes an attempt to automate this decision. That’s actually the reason why we never ask for a cut-off. We expect the user to review their modes first and then decide if any of the modes are dominant. Also, the program default is to NOT consider dominant modes for signage. Therefore, the only time when this comes into play is when the user specifically requests it.
If the user decides that there is a dominant mode, then they just check a box in the RSA analysis options that says “use the “dominant” mode for signage”. When this box is checked then the RISA will always assume that the dominant mode will be the one with the highest mass participation in that direction. If not checked, then all RSA results will have a positive sign like you would otherwise expect for RSA results.
We could have asked the user to specify which mode they wanted to call the “dominant” model. But, I don’t know that would improve upon that feature all that much.
Also, interface issues are very important to us. Therefore, if you have ideas about how this option could be (or should be) more visible to the user then I wouldn’t mind hearing them…. Though it may make more sense for you to respond privately rather than to bore the list with mundane details of our program interface. Of course, this may just be an situation where you had not explored the RSA options in our program very much before you posted that comment. If so, then no need to follow up with me.
Josh Plummer, SE
(949) 951-5815 (voice)
(949) 951-5848 (fax)
From: Josh Plummer
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