December 12, 2017; 11:00 AM – 1:30 PM Pacific Time
S. K. Ghosh, Ph.D.
ICC Preferred Provider Course Number: 14221
ASCE 7-16 includes two significant new items related to the seismic design of diaphragms. First, a new Section 12.10.3, Alternative Design Provisions for Diaphragms including Chords and Collectors, has been added to Section 12.10, Diaphragm Chords and Collectors. The new section provides for an alternative determination of diaphragm design force level, which is mandatory for precast concrete diaphragms in buildings assigned to Seismic Design Category (SDC) C or above. The alternative is permitted to be used for other precast concrete diaphragms, cast-in-plane concrete diaphragms, and wood diaphragms supported on wood framing. All diaphragms other than precast concrete diaphragms in SDC C, D, E, or F buildings may continue to be designed using the design force level in ASCE 7-16 Section 12.10.1, which is unchanged from ASCE 7-10.
To go hand-in-hand with the alternative diaphragm design force level, ASCE 7-16 includes a precast diaphragm design procedure in Section 14.2.4, which is based on extensive research. The procedure must be used whenever the design force level of Section 12.10.3 is used. The requirements of Section 14.2.4 are in addition to the requirements of ACI 318-14 Section 18.12, Diaphragms and Trusses.
The procedure gives the designer three diaphragm design options for selecting the target performance of a diaphragm when subject to earthquake excitation. The Elastic Design Option (EDO) seeks to keep the diaphragm elastic in the Maximum Considered Earthquake (MCE). The Basic Design Option (BDO) seeks to keep the diaphragm elastic in the design earthquake while permitting controlled inelastic behavior in the MCE. The Reduced Design Option (RDO) permits controlled inelastic behavior even in the design earthquake. The choice of options is not unrestricted, but depends on the seismic design category, the number of stories, the diaphragm span, and the diaphragm aspect ratio.
The seminar will explain the alternative diaphragm design force level as well as the precast diaphragm design procedure of ASCE 7-16.
Dr. S. K. Ghosh is known internationally for his work in earthquake engineering. He has influenced seismic design provisions in the United States for many years by serving on or chairing numerous committees and advisory panels. He specializes in the analysis and design, including wind and earthquake resistant design, of reinforced and prestressed concrete structures. Dr. Ghosh is active on many national technical committees and is a fellow of ASCE, SEI, ACI, and PCI. He is a member of ACI Committee 318, Standard Building Code, and the ASCE 7 Standard Committee (Minimum Design Loads for Buildings and Other Structures). He is a former member of the Boards of Direction of the Building Seismic Safety Council (BSSC), the American Concrete Institute (ACI), and the Earthquake Engineering Research Institute (EERI). In addition to authoring many publications in the area of structural design, he has investigated and reported on structural performance in recent earthquakes.
Please note a single registration allows you to have one connection.
However, a number of people can view and listen to the seminar using one connection
by using an LCD projector (or a large computer monitor) and good computer speakers or a speaker phone.
All attendees, irrespective of the number of registered connections, can earn 0.25
Continuing Education Units (CEUs) or 2.5 professional development hours (PDHs). CEU/PDH certificates are provided free of charge.
We provide discounted registration for small businesses.
If you are already registered with us as a small business,
please log in to your user account first to receive the small business discount.
If you are not registered with us as a small business yet, please see if you qualify.
Do You Qualify?
- A connection is defined as a single web connection plus a single telephone connection
(if necessary). If you want to sign up for more than one connection for this seminar, you will have the opportunity to do so after placing the registration in your cart.
- A $15 fee will apply if the seminar registrant wishes to revise the web seminar registration (e.g. switch from one web seminar to another).
- Refunds are limited to 80 percent of fee and must be applied for in writing WITHIN THIRTY DAYS after the scheduled seminar.
We are a registered provider for continuing education in the
State of Florida (Provider # 4732), the
State of New York
(Provider # 99), the State of New Jersey (Provider # 24GP00014200), the State of Maryland, and for the
Structural Engineers Certification Board (SECB) of the National Council of Structural Engineers Associations (NCSEA).