Previously featured in the YMG newsletter, The 15th edition of the AISC Steel Construction Manual has many more changes that all structural engineers should know about. For example, the 15th edition has added a few new high strength materials, which include ASTM A913 Grades 65 and 70 for W-shapes and ASTM A500 Grade C HSS shapes. While these additional materials might not be earth shattering, they are good to have in your back pocket. A major change in the manual comes in the Specification, where the provisions for the design of compression members with slender elements have been amended. The new provisions provide a unified approach for both stiffened and unstiffened elements which makes the design process easier than before, but at the same time does change the compressive strength of members found in previous code versions. One last change of note is that Part 6: Combined Flexure and Axial Force Table and Part 4: Available Strength in Compression for Filled HSS Members Tables of the last edition have been removed. These tables are not gone for good, however. They can now be found in the AISC Version 15.0 Design Examples document.
Source: Modern Steel Construction | January 2018