HUMAN SAFETY CRITERIA FOR EXISTING BRIDGES CONSIDERING EMERGENCY AND CRISIS SITUATIONS

Abstract eng:
Specification of the target reliability levels is a key issue of the assessment of existing bridges in emergency and crisis situations. ISO 2394 indicates procedures for specification of the target reliability by the total cost optimisation in conjunction with human safety criteria. Since the latter criteria often dominate the target reliability for existing structures, their application is discussed in detail focusing on conditions specific to emergency and crisis situations. For a reference period of one week the target reliability indices range mostly from 3.1 to 3.6, thus significantly lower than those applied in the design of new structures.

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