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Hello, JoshJoshPlumSE: Thank you for your help. It is nice to hear from the people from SAP2000.[bigsmile] I am using GetDamper function in OAPI, my code is like this: PropLink = NET.explicitCast(SapModel.PropLink,'SAP2000v1.cPropLink'); ret=PropLink.GetDamper("D1", MyDOF, MyFixed...

I am using MATLAB to access SAP2000 v21. I found that the CSI_OAPI_Documentation.chm come with the program doesn't provide enough information. And I think they are not up to date. Where can I find more information?

Hello, rscassar: Thank you for your help! I've tried: help SapModel.PropLink and it returns: SapModel is a variable of type SAP2000v1.cSapModel. and help PropLink returns: PropLink not found. I still do not know how to fix the prolem.

I updated my SAP2000 from v14 to v21, and found that my old MATLAB API code doesn't work any more. I'am trying to update my code, and got stucked. My original code is like this: ret = SapModel.PropLink.SetDamper("D1", MyDOF, MyFixed, MyNonLinear, MyKe, MyCe, MyK, MyC, MyCexp, 1, 0); The...

I am writing an essay, and I need to know the name of this kind of structures. It’s a structure to reinforce a bridge for heavy cargo transportation, so that the bridge can carry loads that it couldn’t carry originally. After the heavy cargo passing the bridge, in some circumstances, the...

Thank you very much for all your helps, Sebastian. I also asked my professor about this issue. My prof. said there is no way to achieve 5% damping for all the modes, which two modes should be chosen is engineer's judgement.

Dear Sebastian: Thanks again for your response. You said I can easily find out the first two natural frequencies with SAP2000; did you mean the natural frequency from the first two modes of modal analysis? Following graph is the result of my modal analysis. If ?0 = 0.5807rad/s, ?1 =...

Dear Sebastian: Thank you so much for your help, and your answer is very useful. I read the Chopra's book you attached, and there is a very nice example of solving a0 and a1. But the problem is that the example structure has point masses, and the stiffness is also easy to calculate; my...

I want to do a Nonlinear Time History Analysis to a building. Because I have non-zero initial conditions, I have to use the Direct Integration method. The problem is that for direct integration method, I do not know how to set a constant damping coefficient of 0.05. In the following form...

Thank you very much, Sebivaq. That's what I did. I do not know if there is an easier way.

In SAP2000, how do I get a graph like following? I do not mind to plot this graph point by point in a spreadsheet, but I do not know how to get the percent of the full load data. Thanks.

Sorry, the pictures are down. I post them again. Figure 1. Acceleration Load Case. Figure 2. Result from Dead Load Figure 3. Result from Acceleration

Hello?IJR: Thank you very much for your response, but I still haven't got the point. If I have a mass weights 5kN at the tip of a cantilever, I will get 5kN reaction at the base without acceleration. I do not quite understand you. Following figures show my cantilever. There are only two...

When I define a load case in SAP2000, there are two types of load. One is "load pattern", and the other one is "acceleration”. If I define acceleration in "UZ" direction, with scale factor of 1, what does it mean? The scale factor is the factor of what? Factor of the gravity? I defined an...

I would like to analyze stress strain behavior of a steel beam using Static Riks. The Load proportional factor stop increasing shortly after reaching the yield strength. How to I solve the problem? Following is the status file, STEP INC ATT SEVERE EQUIL TOTAL TOTAL STEP INC OF...