There are steel girders in my file that I can't delete. Even if I select them I can't delete them.
If the bridge is active and you cannot delete the files, please file a support ticket with the design files, so we can look into the issue.
How can i know bridge is active mode or deactivate mode.
If you have multiple bridges in the same file then you can right click on the bridge and select "Set Active Bridge"
Email me your OBM model (Dilip.email@example.com) where you are not able to delete the girders.