新湊大橋 (仮称) における大規模地震動 (L2地震動) 設計について

抄録

Seismic design for Sinminato-oohashi (a cable-stayed bridge having steel-concrete hybrid girder) was carried out according to the latest Standard Specificationsfor Highway Bridges. The concept of the seismic design is to sustain to significant strong earthquake such as the 1995 Hyogoken-Nambu earthquake using anti-earthquake system composed of cable-dampers, lead-rubber bearings and oil-dampers instead of using ductility of pier bases to reduce the seismic load.
At first, seismic performance preventing serious damage by level 2 earthquake is described, then the seismic design process to secure the performance including dynamic response analysis is described. Finally, a solution to overcome the difficulty of assuring the seismic performance for large cable-stayed bridges is described.