Dear all
please create automatically Global Stiffness 6x6? as pic and attachment mathcad below
Thank you
Hi,
My mathcad sheet can calculate the global frame stiffness matrix for the plane frame as underlined below with the 3 degrees of freedom, horizontal, vertical, and rotation.
You would then need to make the adjustments to it as described in your example by assuming rigid diaphragm action of the floors and condensing vertical displacement. The relevant mass matrix also needs to be assembled. This is not done in my sheet.
I said before commercial software suites are available to undertake such analysis and most engineering companies have access to same. The time it takes to get Mathcad working if paid at engineering charge out rates you pay for the commercial software suites. Strand7 , SAP 2000, Ansys can do this type of time domain analysis. If you are in an academic domain one of them is probably available to you.
Not to give up hope if you still want to use Mathcad 15 you should also check out the site http://www.dynamassist.com/
Cheers
Terry
I'm probably missing the point here, but is the attached along the lines of what you want?
Stuart
Hi
The submitter has asked two questions the second being how to get the global stiffness of a frame with 10 nodes and 12 members then condense that to the simplified form in his second example. My answer shows how to get this global stiffness matrix.
Cheers
Terry
Hi,
I have changed the file to Prime.
I have fixed the plotting of input, still have to fix plotting of results.
I have shown how to extract the horizontal deflections under horizontal force at each storey into a smaller matrix delta H.
I have shown how to use this sampled deflection matrix to get the required K.E
