Seismic Fragility Analysis of Bridge System Based on Fuzzy Failure Criteria

Table 4

Description of bridge damage.

Damage state	Damage index
No damage	—
Slight (SL) damage	The pier and abutment are slightly cracked and need not be repaired
Moderate (MO) damage	The pier is cracked but still safe, with displacement at the top or bottom
Extensive (EX) damage	The large area of concrete spalling, the joint damage, and displacement
Complete (CO) damage	Pier collapse and girder fall