Title:
Review of Performance Based Design Criteria in CHBDC (CSA-S6)
Author(s):
Pantazopoulou
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/30/2025
Abstract:
In the CHBDC Code (Canadian Highway Bridge Design Code) Performance Based Design (PBD) is required for all bridges located in regions of high seismicity (Seismic Design Category, or SDC=3), whereas for moderate seismictiy, (i.e., SDC=2) it is required for bridges that are characterized as Lifeline bridges and Major bridges that present geometrical irregularities (such as abrupt changes in weight, height of piers, span lengths and stiffness between successive supports). The SDC is classified according with the site-specific spectral acceleration, for seismic hazard with a uniform probability of exceedence of 2% in 50 years (2475 yrs return period). The SDC, Bridge Type (Irregular or Regular) and Bridge Importance (Lifeline, Major route, Other bridges) also dictate the acceptable analysis method used to estimate the seismic demands (Elastic Static or Dynamic, Inelastic Static Pushover, and Nonlinear Time History Analysis). Performance criteria for three limit states, mapped to three different probabilities of exceedence (10%, 5% and 2% in 50 years) are prescribed in terms of they have on Service and Damage to the structure. Service disruptions are described as Immediate, Limited Service, and Service Disruption. Damage states, quantified in terms of EDPs for the structural components and the bridge materials, are classified qualitatively as Minimal, Repairable, Extensive, and Probable replacement. The presentation reviews the general framework of application of PBD according with the CHBDC Code, and the detailed quantitative performance requirements with reference to a simple case study for illustration of the methodology of the required checks.