Recent content by catenaryworks

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.

The code below plots 'k' along the y-axis and 'theta' along the x-axis. I would like help on the following, for which I do not know how to write out the code in MATLAB: 1. I want to extract only those 'theta' values corresponding to integer values of 'k' 2. Then, use the above 'theta' values...

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...