Hi Zero_1
I am not sure whether I understood your problem or not.
Is your question is (Say 60 is your hinge point),you are checking operating displacement at node no 60 & getting some reasonably good values ?
If that's the question Check connecting point of 60 (Say 61)also you will get same operating displacement. Only one or two angular rotation will be different based on it's a hinged or gimbal expansion joint. So relative displacement is same.
If problem is something else you can upload your caesar file here mentioning exact problem Or can send me mail habibur21@gmail.com
I shall try to identify the problem.