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Existing Buildings and the "10% Rule" - Are We in Agreement?


Additions, alterations, and voluntary seismic improvements to existing buildings can be challenging to implement. This presentation provides a brief history of the addition and alteration code sections’ evolution; survey questions asked of the structural engineering community; and the results of the survey, including differentiation of responses by practicing engineers and building officials, licensed structural engineers and licensed civil engineers, younger engineers and seasoned engineers. Survey data is analyzed to correlate the questions to Existing Building Code provisions and highlights common themes of uniformity and disagreement among the profession. The presentation concludes with remarks that may help both practicing engineers and building officials by providing a path forward.

  • Course will award 1.5 hours of continuing education
  • Diamond Review approved in all 50 states
  • This webinar will be available as a recording.


  • Kevin O’Connell, S.E.

    Kevin O’Connell  is an Associate Principal and Structural Engineering Division Head of the LA office of Simpson Gumpertz & Heger. He served on Los Angeles Mayor Garcetti’s Earthquake Technical Task Force and on the Western Chapter of the Association for Preservation Technology’s board.

  • Daniel Zepeda, S.E.

    Daniel Zepeda is a Principal with Degenkolb Engineers, the co-chair of the SEAOSC EBC and immediate past chair of SEAOC EBC. Daniel was a member of Degenkolb’s post-earthquake reconnaissance team that surveyed the earthquakes in Chile (‘10), Baja California Earthquake (‘10), and Taiwan (‘16).

July 7, 2020
Tue 10:00 AM PDT

Duration 1H 30M

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