Abstract
This note discusses earthquake loading in the design of highway bridges in light of recent seismic design criteria established for the Northumberland Strait Crossing Project. A review of the existing limit states design method requirements and the istandardi NBC earthquake is given. Associated with the standard NBC earthquake for bridges are a specific design life of 50 years and a safety index of 3.5. New relationships linking the probability of exceedance of the factored earthquake to the probability of exceedance of the unfactored earthquake and linking the probability of exceedance of the factored earthquake to the notional probability for the safety index are discussed.
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