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Re: Response Spectrum Analysis
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- Subject: Re: Response Spectrum Analysis
- From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
- Date: Fri, 04 Feb 2000 14:21:14 -0500
I would say it is also dependant on how your analysis program interpolates between points that you specify. If it does linear interpolation, then you will want to use a tighter spacing. I have only used RISA and I know RISA will use log interpolation between points. This tended to allow me to use fewer input points. Hope this helps, Scott Maxwell At 11:47 AM 02/04/2000 -0600, you wrote: >I am doing a response spectrum analysis of a steel covered playground. I am >using an older version of SAP2000 that has the 94 UBC response spectrum >functions for soil types S1, S2, S3. I would like to manually input a >response spectrum from the 97UBC. I understand that when T = 0, Ca = 1.00 >and from To through Ts Ca = 2.5. What I am not clear about are the points in >between. I know that when T>Ts, Ca =Cv/T, but I was not sure what increments >of T should be used. I just used increments of 1.00. after Ts. I have >generated the response spectrum curve from the 97UBC as follows: > >Cv = 0.54 >Ca = 0.36 > >T Ca >0 1 >.12 2.5 >.60 2.5 >1.6 0.34 >2.6 0.21 >3.6 0.15 >4.6 0.12 >5.6 0.10 >6.6 0.08 >7.6 0.07 >8.6 0.06 >9.6 0.06 > >Is this correct? or, should I figure out an equal number of increments from >Ts = 1.6 to T = 10? Does someone have an example function that I could look >at? What parameters are typically used for the response spectrum analysis >using SAP2000? > >Thanks in advance, > > >Gina T. Gobo, E.I.T. >Structural Engineering >DLR Group >Seattle >Ph. 206.461.6000 >Fax 206.461.6049 >ggobo(--nospam--at)dlrgroup.com > > > >
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