Stiffness Method for Frames - Part 1, Setup

[@anthonyvelasquez4184]

Is there a reason you do not consider the rotation of the joints at the pinned supports as DOF 4 & 5?

[@tonatiuhrodrigueznikl7816]

You're allowed to omit rotational DOFs at moment-free ends provided that you use the right stiffness factors and force recovery process. We do this to reduce the problem to a 3x3 instead of the 5x5 it would otherwise be.

[@valentinraeber9862]

what kind of book do you use with the stiffness definitions?

[@tonatiuhrodrigueznikl7816]

We use an appendix from a published structural analysis book. The title doesn't come to mind, but any intermediate or advanced structural analysis text will have similar appendices.

[@MohamedIDIR190]

thanks a lot, this really helped me.

[@mumrah_]

Thank you!!

[@mumrah_]

I ran the same script in MathLab but I get 7.58....not sure why