New Seismic Design Provisions for One-Story Structures with Flexible Diaphragms and Rigid Vertical Elements

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It has long been recognized that the seismic response of one-story tilt-up concrete wall buildings (and similar buildings with flexible diaphragms and rigid vertical elements) is controlled by the flexible diaphragm much more than the rigid vertical elements. Widely used seismic design provisions have not recognized or incorporated this behavior, however. Now, new seismic design provisions recently developed for ASCE 7-22 explicitly recognize this response behavior, drawing from extensive numerical studies published in the guideline document Seismic Design of Rigid Wall-Flexible Diaphragm Buildings: An Alternate Procedure (FEMA P-1026) and supplemental studies of bare steel deck diaphragms. In fact, the new design provisions go a step further to introduce a zone of reduced shear demand that improves seismic performance by allowing distributed yielding away from the diaphragm perimeter. This webinar is first present the concepts behind the new seismic design provisions, and the numerical studies addressed in FEMA P-1026 and supplemental bare steel deck diaphragm studies. A design example is presented, along with design and detailing tips and recommendations for practicing engineers.

Ms. Kelly Cobeen, S.E. is an Associate Principal with Wiss Janney Elstner Associates and registered Civil and Structural Engineer. She has twenty-nine years of experience working in a wide range of project types, sizes and construction materials. She has a special interest in seismic resistance of light-frame construction, applicable to new construction and seismic retrofit of existing buildings. Ms. Cobeen has been involved in numerous code development, research and educational activities. Code development activities include involvement in the NEHRP Recommended Provisions for Seismic Regulations for New Buildings, in numerous Applied Technology Council publications, and International Building Code and International Residential Code development. Educational activities include coauthoring the Design of Wood Structures textbook, teaching wood design at UC Berkeley and seminars for professional organizations. Research activities include involvement in the CUREE-Caltech Woodframe Project, studying improved seismic performance for woodframe buildings.

John Lawson, S.E. is an Associate Professor in Architectural Engineering at Cal Poly, San Luis Obispo, where he teaches structural wood design. He is a licensed Structural Engineer in California and Arizona, and has over 25 years of consulting experience as a licensed Structural Engineer. He holds a Master of Science in Structural Engineering from Stanford University, and a Bachelor of Science in Architectural Engineering from Cal Poly, San Luis Obispo. Lawson has received national awards in his building designs and his teaching methods.

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Speakers Kelly Cobeen, S.E. and John Lawson, S.E.
Duration 124 mins
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