JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. D1.D.2 AASHTO (LRFD) The following outlines the implementation of the AASHTO Standard Specifications for Highway Bridges (LRFD, 1998) which has been implemented in STAAD.Pro. D1.D.2.1 General D1.D.2.2 Capacities per AASHTO (LRFD) Code D1.D.2.3 AASHTO (LRFD) Design Parameters Parent topic: D1.D. American Codes - Steel Design per AASHTO Specifications Related topics V. AASHTO 2nd Ed LRFD - Design Beam