Hello Mr. Parker,
In order to import a Revit file into Advance Steel, we recommend you to install Graitec BIM Connect 2015. It is compatible with REVIT 2015 and REVIT Structure 2015.
Please find below the link where you can download the plug-in:
On that page you will also find a history of all the modifications and improvements done lately.
Make sure that at the moment you install the plug-in, Revit is closed.
After the instalation is complete, you will notice the Bim Connect tab in the Add-ins menu, where you will find the Export and Import options. Use the Export command in order to transfer your project from Revit into a *.gtcx format, which you can then import into Advance Steel without any problem. The import operation works in a similar way.
Attachment: Graitec BIM Connect.rar