Equivalent nodal loads?
Equivalent nodal loads?
(OP)
Hello, I am trying to find equivalent nodal loads for the following scenario:
-column pinned on the bottom and fixed on the top, with horizontal uniform line load.
What would be the equivalent end moments and forces for this configuration?
I am making a spreadsheet to calculate simple frames and I would greatly appreciate some help.
-column pinned on the bottom and fixed on the top, with horizontal uniform line load.
What would be the equivalent end moments and forces for this configuration?
I am making a spreadsheet to calculate simple frames and I would greatly appreciate some help.





RE: Equivalent nodal loads?
RE: Equivalent nodal loads?
Thanks!
RE: Equivalent nodal loads?
http://n
answers your exact question. You need to calculate the end moments and reactions that would result from your loading if the beam was fully fixed at both ends.
The blog post has a download file with a spreadsheet to calculate the fixed end moments and reactions.
You might also like to have a look at the following posts, which progress from solving simple frames on the spreadsheet to complex frames with VBA routines (I haven't got round to linking to the compiled routines yet).
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Equivalent nodal loads?
RE: Equivalent nodal loads?
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Equivalent nodal loads?
Tara
http://tinyurl.com/4ydjg7m
RE: Equivalent nodal loads?
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Equivalent nodal loads?
Tara
http://tinyurl.com/4ydjg7m
RE: Equivalent nodal loads?
The spreadsheets I linked to have also already been made and are quite general.
I'm not suggesting there is anything wrong with the work of Alex Tomanovich (who I imagine you had in mind) by the way. He does a lot of good stuff, free and open source, as is mine.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Equivalent nodal loads?
That was my main question since I already worked out global and local matrices and the assembled reduced stiffness matrix. I just need the total load vector so I can find displacements and member forces...
Speaking of member forces, do I just multiply element global matrices with the deflection vector? Thanks again.
RE: Equivalent nodal loads?
RE: Equivalent nodal loads?
Yes, you mutliply the element global matrix by the deflection vector to get the nett force and moment at each node.
There is an example with a portal frame here:
h
Fixed end moments and forces are calculated by the function FEMact, and the matrices are set up and solved by the routine FormKG. The comments in the code should explain what is happening, but if anything isn't clear, please ask.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/