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k does have integer values: 1,2,.......,12. The y-axis of the plot generated shows them. n=12; d = 200; r = 3200; dbyr=d/r; theta=0:0.0001:2*pi; k=(n/(2*pi))*(theta+dbyr*sin(theta)); plot(theta,k) Thanks.

No, not for school assignment.

...corresponding to integer values of 'k' 2. Then, use the above 'theta' values and solve for corresponding 'alpha' values from the equation: d*sin(alpha) - r*sin(theta-alpha) = 0 3. I would also like to print an array of x and y coordinates corresponding to the above theta values x =...

Hello, I would like to know what definition of "strain" is used for CABLE ELEMENT by SAP. I am performing nonlinear analysis of cable-truss structures and am trying to write a Matlab code to compare with SAP results. I recognize that the source of discrepancy is probably in the definition of...

Here's my SAP file. I will appreciate any help.http://files.engineering.com/getfile.aspx?folder=9f01e3be-5859-4b91-9ac3-4c7211fde922&file=ARCH_engtips.SDB

What would be the suggested procedure in SAP2000 for determining the buckling load Pcr for this particular 3-hinged arch with loads as indicated in my previous message?

I figured this out. It was because I had the analysis set-up to a 3D analysis while my model was 2D. Thanks for responding.

Hi, Attached is the 3-hinged arch I want to analyze to determine at what value of P, the arch will buckle. Cross-section of the arch member: 5.5" x 30.25", E = 1800 ksi I have been using non-linear P-delta analysis and applying P in small increments. Is there an easier way to obtain Pcr...

Draw it in AutoCad and IMPORT it to SAP.

Hello, I am performing an analysis of a prestressed cable-truss in SAP. On running the analysis, I obtain an error saying - "NULL GLOBAL DOF UY IS COUPLED TO A NON-NULL GLOBAL DOF AT JOINT 21 COSINE BETWEEN COUPLED DOF = 0.923880" Can someone help interpret this? Thanks

I am unsure if I attachment is uploaded. Here are the geometry and material properties. Left support : 0,0 Left knee : 50 ft, 30 ft Ridge (hinge) : 100 ft, 40 ft Right knee : 150 ft, 30 ft Right support : 200 ft, 0 Cross-section of the arch member: 5.5" x 30.25" E = 1800 ksi

Hello, I am trying to analyze a 3-hinge arch to find the buckling load. I have attached the SAP file here, which has the modeling done correctly. I suspect I am not doing to P-delta analysis correctly. My objective is to apply equal value point loads at the two knees and the top ridge...

Ishvaaag -- This was posted by Osquro to my question about opening files in other versions. His explanation is more elaborate and clear. Here it is ....... osquro (Structural) 15 Aug 11 9:57 Try using .s2k (or .$2k) file. Lets say that version 14.2.4 file was created in the computer A and...

Thank You! It works well.

According to BBWang's book page 28, such prisms are geometrically flexible and contain infinitesimal mechanisms. There is a mention about dumb elements used to make the structures geometrically rigid. We can then use the stiffness-method for analysis. SAP must be using Stiffness Method. Which...

Ishvaaag -- Open the .SDB file in Wordpad. Within the Wordpad file, search for PROGRAM CONTROL where the version number will be written. Change the version number from 15.X.X to 14.X.X. Go to your version 14, then to FILE, then Import the saved Wordpad file. It should open now. I could open...

Ishvaaag, Can you post your .s2k files instead of your .sdb for all the above that you sent. .s2k can be opened in older versions.

How do you open SAP 2000 v14.2.4 files in v14.1.0?

Ishvaaag -- Thanks so much for your thorough responses. I will try to figure out how I can open your SAP files and work with your messages.

ishvaaag, Your MathCad solution is very instructive. Thank you again. I understand that you use temperature change for changing the tendon lengths to eventually achieve the equilibrium configuration. The analytical solution, like your MathCad results, gives alpha=30. From your message on "6...