The pin left index values should be for ja = 2 and jb = 4, but in eq-1 (in attached screenshot) it is shown index 3 for ja and index 5 for jb . so please provide the clarity on this.
Thanks & Regards,
Ajay
Hey @jyskrwr, the indices are correct as shown.
Remember, these index values correspond to locations in the overall primary stiffness matrix. This overall matrix for the structure still allows for a moment at the pin, until we remove that DoF at the top of the next code block…
removedDoF = restrainedDoF + pinDoF
Seán