Direct Stiffness Method works for Simple Unbraced Frame, but does not for Braced Fram

[kabindrab]

Hi everyone!

I am trying to develop a spreadsheet that calculates reaction forces for a simple braced frame using direct stiffness method. I did the regular process of

Calculation of stiffness matrix in local coordinate
Calculation of stiffness matrix in global coordinate
Calculation of global stiffness matrix
Calculation of reaction forced from known values

My problem is that my spreadsheet calculated right reaction forces for unbraced frames. It does not calculate right reaction forces for braced frame though. Is Direct Stiffness Method limited to unbraced frames only? I didn't think so but I feel like I have reached a road block can't find out why. :( Please help.I can upload the spreadsheet if you all want me to.

[Cragyon]

Yes, upload your calculations. The "Direct Stiffness Method" is not simple as I believe it require calculus.