![]() KEYNOTE SPEAKERREWRITING THE AISI SHEAR PROVISIONS: WHY, HOW, AND WHAT’S NEXTCONTINUING EDUCATION: 1 PDH OUTLINE The shear design provisions in AISI S100-16Section G are based on historical research performed mainly at the University of Missouri-Rolla. Recently, considerable research on shear design and shear with holes has been performed mainly at the University of Sydney, although there has been substantial research worldwide. This research uses the methodology of the Direct Strength Method (DSM) of design now incorporated throughout AISI S100. Further, for sections with holes, the current design method in Section G3 is mainly empirical with the design curves fitted to test data. A new design method based on a Vierendeel model has been developed and allows a wide range of sections with circular, square, rectangular and slotted holes to be designed, including for larger hole sizes. Accordingly, Sections G2: “Shear Strength of Webs Without Holes” and G3: “Shear Strength for Members with Holes” are undergoing substantial revision and improvement to align with this research. An AISI Specification Committee ballot has already approved the new G2 rules, and the new G3 rules are currently under ballot. The new design rules allow for post-buckling in shear, and result in significantly increased design strengths. Research for Section G4: “Transverse Stiffeners” is also complete and will be used to revise Section G4 to align with the AISC 360 Specification, which itself has had substantial recent revision. Design examples will be included in the presentation for practicing engineers. ABOUT THE PRESENTERGregory J. Hancock, PhD, DEng.
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