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New Building Code Provisions for Brace Design of Special Concentrically Braced Frames |
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مجله ساختمان و کامپیوتر -
نشریه شماره 22
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نوشته شده توسط hamid fereidouni
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By Payam Khashaee, PhD, PE, Thornton Tomasetti, Inc. /
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In January 2008, the California Building Code 2007 edition, which is based on the International Building Code 2006 edition, became effective, and consequently ASCE 7-05 for loading, and AISC 360-05 Specifications and AISC 341-05 Seismic Provisions for steel design. The prior California Building Code was approved in 2001, which was based on the 1997 edition of Uniform Building Code. Therefore, there are major changes in the building code including the seismic design parameters for SCBF systems. For example, Response Modification Coefficient R has changed from 6.4 to 6.0 and Over Strength Factor W from 2.2 to 2.0. The width-thickness ratio requirements (local buckling) for braces have not changed in the code. However, the slenderness limit (member buckling) for an SCBF brace in AISC 2005 is over 30% more stringent than the former editions of the code. |
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