I have programmed an Euler-Bernoulli beam, supported on springs, using both SAP2000, and by using the stiffness matrix method in MATLAB.
The nodal (joint) displacements calculated due to an applied load agree closely between SAP2000 and the MATLAB model. The rotations sometimes disagree. Anyone know why this might be?
What solution procedure does SAP2000 use that might account for these differences?
Thank you.