National Steel Bridge Alliance

LRFD Simon (AASHTO 9th Edition) Registration

LRFD Simon is a powerful line-girder analysis and preliminary design program for steel I-shaped plate girders and multiple single-cell box girders.  It allows users to quickly produce complete steel superstructure designs in accordance with the 9th Edition AASHTO LRFD Bridge Design Specifications.  The program is offered free of charge by the National Steel Bridge Alliance (NSBA).  More information regarding this version can be found in the release notes.

Once you have completed and submitted the following information, you will be provided a link to the current version of the LRFD Simon.

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For questions regarding either LRFD Simon or the NSBA Bolted Splice spreadsheet, please email

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