The steel industry works hard to improve and maintain the art and science of steel design and construction. This is accomplished through the support and tracking of research in steel design, committee deliberations based on design practice and performance, and the ongoing development of design aids, and design procedures that appropriately predict the strength and serviceability of structural steel. However, for many years now, the industry has been split. Some users prefer the precision and improvements made in their newer LRFD manuals, which are the only design manuals that AISC has produced since 1989. Others prefer to design using their familiar ASD manuals, as the method still provides safe and reasonable designs. But the ASD manuals are becoming outdated, with shape properties that are no longer accurate, and some design methods, such as that of composite beams, which do not produce economical results. In answer to the demands of the industry, and after decades of running their separate course, ASD and LRFD have been brought together-and made better than ever. The 13~(th) Edition AISC Steel Construction Manual was released in December 2005, and will be the first unified AISC Manual since 1978. The 2005 AISC Manual replaces the 9~(th) Edition ASD Manual of Steel Construction, the 3~(rd) Edition LRFD Manual of Steel Construction, and the HSS Connections Manual.
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