Seismic Isolation Analysis on Long-Span Platform Bridge Connecting Twin-Tower Structures
In order to mitigate the seismic response of twin-tower structure linked by a steel truss platform bridge, as well as to reduce temperature force in the steel truss, eight groups of combined isolation system, each consisting of one pot-type bearing and four rubber bearings, were designed to connect the upper platform bridge to the lower supporting reinforced concrete towers. The features and working principles of the high-position isolation system were described. Then the seismic responses, including displacement, story drift and floor acceleration, of the structure with the isolation systems were calculated and compared with those of the structure with hinge joints in lieu of isolation. It is found that both the structural seismic responses and the temperature forces in the large-span mega-truss structure can be reduced by the high-position isolation system.
H. S. Sun et al., "Seismic Isolation Analysis on Long-Span Platform Bridge Connecting Twin-Tower Structures", Advanced Materials Research, Vols. 255-260, pp. 1225-1229, 2011