STUDY ON NEW SEISMIC CONTROLLED SYSTEM USING ELASTIC CABLES, SEISMIC DAMPERS AND SLIDE BEARINGS FOR THE EXISTING SUSPENSION BRIDGE

Abstract

 This paper describes seismic systems on continuous structure of the floor framing girders in the existing suspension bridge.
 In order to solve the problem of fatigue damage due to the increase of the over-loaded traffic or the damage caused by the water leakage from the expansion joints in floor framing girders of the existing suspension bridge, the application of bearings with the good slide and rotational function in floor framing girders is effective. Movable bearings are installed in the floor framing girders in order to release the constraint at fix supports and as a result, it is expected that the floor framing girders with deck slab and the stiffening truss girders perform independently and the main towers and anchorages support the inertial force through the seismic dampers. Furthermore, elastic restrained cables are installed between the end of floor framing girders and main towers, anchorages to improve the performance of the bridge against the service load and seismic load.