Designing Diaphragms to Handle Structural Irregularities: Insights from IBC 2021 and ASCE 7-22: Day 2 – Design of Steel 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,” covering designing steel diaphragms for out-of-plane offsets in a steel building addressing seismic design categories B and D.

• Course will award 1.0 hour of continuing education
• Diamond Review approved in all 50 states
• This webinar will be available as a recording.

Speaker:

Rafael Sabelli, S.E., is a Senior Principal and Director of Seismic Design at Walter P Moore. Rafael has earned a Special Achievement Award from AISC, as well as the T.R. Higgins Lectureship award. He is active in the development of seismic design standards for steel systems and is a member of the AISC Seismic Provisions Committee, the ASCE 7 Seismic Task Committee, and the NIST Building Seismic Safety Council’s Provisions Update Committee. Rafael is the chair of the AISC Seismic Design Manual committee and was the project manager for the five-volume SEAOC Seismic Design Manual. Rafael is co-author of Ductile Design of Steel Structures.

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