This seminar starts by pointing out the methods by which a designer may comply with the seismic design requirements of the 2015 IBC and ASCE 7-10: Equivalent Lateral Force Procedure (ASCE 7-10 Section 12.8), Modal Response Spectrum Analysis (ASCE 7-10 Section 12.9), or Seismic Response History Procedures (ASCE 7-10 Chapter 16). The procedures in ASCE 7-10 Section 12.9 and Chapter 16 are more complicated than the Equivalent Lateral Force Procedure, but are required to be used under certain conditions of irregularity, occupancy, and height. Over the years, many questions have been asked about code provisions concerning these procedures and this seminar has been created to answer these questions and demystify the application of the code.
Although ASCE 7-10 (the 2015 IBC) formally recognizes modal response spectrum analysis as well as seismic response history analyses, the modal response spectrum analysis is still more common in design office usage and is the primary subject of this seminar. The background and details are explained in Part I of this seminar, extending into Part II, where a step-by-step analysis procedure is introduced.
A three-story, one-bay frame example is solved entirely manually in Part II of this seminar, to illustrate application of the step-by-step procedure. The remainder of Part II is devoted exclusively to the detailed design of a 20-story reinforced concrete shear wall-frame building. Modal response spectrum analysis is used as the basis of design. Design utilizing the Equivalent Lateral Force Procedure is also illustrated because it is basically a prerequisite to design using the Model Response Spectrum Analysis Procedure.
Important changes to the modal response spectrum analysis procedure in ASCE 7-16 will be briefly mentioned.
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.
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S. K. Ghosh
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