Abstract
Seismic retrofit design of a PC hinged rigid-frame bridge against Level 2 earthquake ground motions was performed by using seismic response control devices at piers and the central hinge, and continuing main girders at the central hinge section. Three-dimensional non-linear dynamic time history analyses were carried out using earthquake ground motions specified in the current specifications for highway bridges, in order to improve seismic performance of the bridge. Dynamic performances were compared by changing the type and arrangement of the seismic response control devices. For installing seismic response control devices at piers or the central hinge, effects on seismic response reduction were confirmed, compared with the as-built bridge. For installing shear panel dampers both at piers and the central hinge, more effects on seismic response reduction were confirmed. It was also found that continuing main girders at the central hinge section and installing shear panel dampers at piers was effective with retrofit areas and retrofit members getting smaller.
