20951Seismic Performance Level and Limit States

In the JRA specifications [76], the determination principles of the limit state to attain the necessary seismic performance are clearly specified. For example, the basic principles to determine the limit state for SPL 2 is: (1) the plastic hinges shall be developed at the expected locations and the capacity of plastic hinges shall be determined so that the damaged members can be repaired relatively easily and quickly without replacement of main members; (2) the plastic hinges shall be developed at the portions with appropriate energy absorption and with quick repairability; (3) considering the structural conditions, the members with plastic hinges shall be appropriately arranged and the limit states of members with plastic hinges shall be determined appropriately. Based on the basic concept, the arrangement of members with plastic hinges and the limit states of members for ordinary bridge structures are specified in the commentary.

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