2052 Caltrans

Table 20.2 outlines Caltrans seismic performance criteria [24] including the bridge classification, the service, and damage levels established in 1994 [15]. A bridge is categorized as ''Important" or ''Ordinary."

For Standard "Ordinary" bridges, the displacement-based one-level safety-evaluation design ("no-collapse'' design) is only required in the Caltrans SDC [35]. Nonstandard "Ordinary'' bridges feature irregular geometry and framing (multilevel, variable width, bifurcating, or highly horizontally

Passive abutment resistance required as part of ERS Passive strength = presumptive value given in Article 7.5.2 in Guidelines OANR: Use 70% of presumptive strength

Ductile diaphrams in superstructure

OANR: Yielding restricted to substructure

Ductile diaphrams in superstructure a

Seat abutments whose backwall is not designed to fuse, whose gap is not sufficient to accommodate the seismic movement, and which is not designed for the expected impact force

OANR: Design to fuse or design for the appropriate design forces and displacements

Wall piers on pile foundations that are not strong enough to force plastic hinging into the wall, and are not designed for the 3% in 75-year elastic forces

OANR: Force hinging into the wall with multiple pile lines and pile cap

Wall piers on pile foundations that are not strong enough to force plastic hinging into the wall, and are not designed for the 3% in 75-year elastic forces

0 0

Post a comment