Thanks JBeng00, for your reply.
I am sorry that I did not state the problem clearly. I mean modelling the bridge lane load.
In the SG manual it says: "This module does not generate loads from static sources such as bridge lane loads. They must be input using the normal load input tools in SPACE GASS". I tried to use area load to model this load, but the bridge lane may be positioned at certain locations on the grillage and in most cases, the are no members on their boundaries to form areas.
I appreciate any help.
Han