Dear All,

Our client ask for performing simplified analysis of lines which are in between critical and non critical criteria.

In methodology of simplified analysis it is required to provide linear restraint in the entire model.

Can anyone eloborate Linear restraints and bi-linear restraints from caesar point of view?

I think your client is concerned about linear / non-linear analyses. Linear is simpler but mostly efficient. Non-linear includes friction, one way restraints (such as lift-off), gaps etc.

Bi-linear is a special feature in Caesar that allows a spring location to have an increasing spring load (f = kx) to a given deflection and a constant force thereafter. See the User Guide.

Thanks Moverz for your valuable reply.

It is our understanding that usually models are evaluated on Non linear type supports which include friction, gaps etc.

How to differntiate between linear restraint and one way(Non linear) restraint(such as lift off) as we think that in a linear support (+Y)without friction factor lift off is still possible.

Can you please further elaborate Linear and Non Linear with any suitable example.


Waiting for response.

If it can move up (+Y) but not down (-Y) it's non-linear, and will need iterations to find for every load case, what the actual situation is.

These days Caesar II is so fast that it really does not make much difference timewise if you use fix Y or +Y, with or without friction. The only time constraint comes up if it does not converge.

Thanks Moverz for prompt reply which was easy to understand :)))