FEMA P-1050, the 2015 NEHRP Recommended Provisions (referred to herein as the Provisions) includes two significant items related to the design of diaphragms, which represent changes from the 2009 Provisions. First, ASCE 7-10 has been modified to include a new Section 12.10.3, Alternative Design Provisions for Diaphragms including Chords and Collectors. This modification has been accepted for inclusion in ASCE 7-16. The new section provides for an alternative determination of diaphragm design force level, which is mandatory for precast concrete diaphragms in buildings assigned to SDC C, D, E, or F and is permitted to be used for precast concrete diaphragms in buildings assigned to SDC B.
Second, ASCE 7-10 has also been modified to add a Section 14.2.4, containing detailed seismic design provisions for precast concrete diaphragms including a connector qualification protocol. This modification has also been accepted for inclusion in ASCE 7-16. This seminar will introduce to attendees the alternative seismic design force level and the precast concrete design methodology, which are the subject of FEMA P-1051 Chapter 6. This seminar also points out the many diaphragm design examples in FEMA P-1051 Chapter 11. It further points out the following examples of precast (vertical) seismic force-resisting system: 1. The design of an intermediate precast concrete shear wall building in a region of low or moderate seismicity, 2. The design of a special precast concrete shear wall for a single-story industrial warehouse building in a region of high seismicity, and 3. The partial example for the design of a special precast concrete moment frame.
Dr. S.K. Ghosh, President at S.K. Ghosh Associates, Inc. Read Bio
Dr. S.K. Ghosh heads his own consulting practice, S.K. Ghosh Associates, Inc., in Palatine, Illinois and Aliso Viejo, California. He was formerly Director, Engineering Services, Codes, and Standards, Portland Cement Association, Skokie, Illinois, and Adjunct Professor of Civil Engineering at the University of Illinois at Chicago.
Dr. Ghosh is known internationally for his work in earthquake engineering. He has influenced seismic and concrete design provisions in the United States for many years. Dr. Ghosh is active on many national technical committees and is a fellow of ASCE, SEI, ACI, PCI, and the Institution of Engineers (India). In addition to being a member of ACI Committee 318, Standard Building Code, he is a member of the ASCE 7 Standard Committee (Minimum Design Loads for Buildings and Other Structures). He is a former member of the Boards of Direction of ACI, EERI (Earthquake Engineering Research Institute), and BSSC (Building Seismic Safety Council) of the National Institute of Building Sciences (NIBS).
In addition to authoring many publications in the area of structural design, Dr. Ghosh has investigated and reported on structural performance in most recent earthquakes. On the 50th anniversary of the Precast/Prestressed Concrete Institute (PCI) in 2004, S. K. Ghosh was named one of fifty “Titans” of the U.S. Precast/Prestressed Concrete Industry. He was also awarded ASCE’s 2013 Walter P. Moore Jr. Award for his contributions towards improving the consistency, accuracy and clarity of structural codes and standards throughout the U.S. and abroad. He has just been elected an Honorary member of ACI.
Upon completing this course, you will be able to:
- Update engineers on the latest changes related to the diaphragm design;
- Educate the alternative seismic design force level and the precast concrete design methodology, which are the subject of FEMA P-1951 Chapter 6;
- Introduce the diaphragm design examples in FEMA P-1051 Chapter 11; and
- Learn the seismic design of precast concrete structures.