National Building Code of Canada (NBCC)–Earthquake Design Philosophy and Perspective, New Low Damage Performance Checks for 2020 Edition, Impact Analysis of New Items, Summary of NBCC Process for Revisions to Earthquake Code Provisions
Session: Recent Engineering Uses of National Seismic Hazard Models I
Type: Oral
Date: 4/22/2021
Presentation Time: 02:15 PM Pacific
Description:
The National Building Code of Canada (NBCC) forms the basis for building design in Canada. The structural design provisions for ‘Earthquake Load and Effects’ in NBCC requires seismic hazard data for the 2% in 50 year probability of exceedance earthquake; the basis for design is unique 5% damped uniform hazard response spectra for all locations in Canada. The 2020 edition of the code (NBCC 2020) is expected to be released in late 2021 and is proposed to include significant advancements in the provisions for earthquake design. If adopted, NBCC 2020 will incorporate the latest national seismic hazard assessment as included in the 6th Generation Seismic Hazard Model of Canada. Moreover, in lieu of scaling reference site hazard values from reference Site Class C values using code foundation factors, NBCC 2020 will directly incorporate seismic hazard values calculated for a continuous range of site conditions, with a preference to use Vs30 to define a site condition.
Furthermore, if adopted, NBCC 2020 will require additional ‘low damage’ performance checks for post-disaster buildings for the 5% in 50 year level earthquake, and for high importance buildings and portions of tall normal importance buildings for the 10% in 50 year level earthquake. An impact analysis was performed that indicated that these proposed changes would increase the aggregate new building cost for all of Canada by roughly 1%.
This presentation will describe the process by which NBCC earthquake design provisions are developed and discuss the expected NBCC 2020 major changes and their impacts.
Presenting Author: John Sherstobitoff
Student Presenter: No
Authors
John Sherstobitoff Presenting Author Corresponding Author john.sherstobitoff@ausenco.com Ausenco |
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National Building Code of Canada (NBCC)–Earthquake Design Philosophy and Perspective, New Low Damage Performance Checks for 2020 Edition, Impact Analysis of New Items, Summary of NBCC Process for Revisions to Earthquake Code Provisions
Session
Recent Engineering Uses of National Seismic Hazard Models