JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. D1.A.4 Built-in Steel Section Library The following sections describe specification of steel sections from the AISC Steel Tables. D1.A.4.1 AISC Steel Table D1.A.4.2 Welded Plate Girders D1.A.4.3 Castellated Beams Section Sizes Parent topic: D1.A. American Codes - Steel Design per AISC 360 Unified Specification Related concepts D1.A.10 AISC 360-16 Design G.6.2 Built-In Steel Section Libraries