thank you very much

but still i have some confusion regarding this topic.

when we are performing the static stress analysis and providing +y support. definetly it will be act non- restraint support. but when we are using the same system for dyanamic analysis whether same support(+y) will act like Y (rest+ hold down) . if it is like that then how it is possible the same system will work rest as well as rest with hold hown, but physical support is rest.

i appreciate your fast clarification.