Designing Diaphragms to Handle Structural Irregularities: Insights from IBC 2021 and ASCE 7-22: Day 1 – Design of Concrete Diaphragm, Chords, and Collectors for Horizontal Irregularity

Structural irregularities are not uncommon to encounter in buildings due to the issues that can arise from the coordination of the plan layout, aesthetics, space planning, and other details involved in completing any building configuration. Data from past earthquakes demonstrated that buildings with irregularities have performed poorly and suffered greater damage when compared with buildings having regular configurations.

In regular structures, the seismic demands imposed on the structure by the ground motion generally tend to be well distributed which leads to the dispersion of energy dissipation and damage. However, for irregular structures, the seismic demands tend to concentrate in the zone of irregularity, resulting in major damage and failure of structural elements in these zones. The actual load paths may differ from those in the design analysis due to these irregularities.

This presentation is based on the recently published “Guide to the Design of Common Irregularities in Buildings,” focusing on designing concrete diaphragms for out-of-plane shear wall offsets in a four-story concrete building, addressing seismic design categories B and D.

• Course will award 1.25 hour of continuing education
• Diamond Review approved in all 50 states
• This webinar will be available as a recording.

Speaker:

Badri K. Prasad, S.E., is a President and CEO of OLMM Consulting Engineers, Inc., with offices located in California and India. He has over 30 years of experience in the design of various types of structures, such as healthcare facilities, airports, biotechnology facilities and mid- and high-rise structures among others. He is the past chair of the SEAONC seismology’s concrete committee and was instrumental in publishing the committee’s work, “Concrete Slab as Collector Element,” in the 2008 SEAOC Blue Book. He is the author of the concrete example and project manager of NCSEA’s publication Guide to the Design of Diaphragms, Chords and Collectors and is the project manager for this design guide. He is also the author of the concrete design example in the SEAOC Seismic Design Manual. He has published and presented papers at several seminars on buckling restrained braced frames and research papers on base-isolation system.

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