摘要：Specification of the target reliability levels is one of key issues required for the assessment of existing structures in emergency and crisis situations. International standards ISO 13822 and ISO 2394 indicate procedures for specification of the target reliability levels by optimisation of the total cost. This approach is applied in conjunction with the human safety criteria to estimate the target reliability levels of existing bridges considering emergency or crisis situations. For the reference period of one week obtained target reliabilities are in most cases within the range from 2.0 up to 3.5,thus significantly lower than those applied in the design of new structures.
