The seismic design of the Tokyo Port Seaside Bridge (tentative name)

The Tokyo Port Seaside Road Bridge is under construction to cross Tokyo navigation channel. Its main bridge is a 3-span steel truss bridge with a center span of 440m. Soil condition of construction site is very soft clay and the steel pipe sheet pile foundation is adopted. To evaluate seismicity of the bridge at vigorous seismic activity area, dynamic response analysis is carried out. The super structure and sub structure is simultaneously modelled to consider interaction of them. Large sectional force and deformation are calculated at truss sections, therefore an isolation bearing consisting of sliding system and rubber buffer is installed between the truss part and the reinforced concrete pier.