Dynamic Analysis of the Offshore Platform in Hangzhou Gulf Under Offshore Environmental Loads

摘要

The offshore platform structure in Hangzhou Gulf exhibits an elliptic plan form, 144 m length, 95 m width. The platform surface and the bottom of its steel tube confined concrete piles are designed respectively at elevations of 13.4 m and — 91.0 m. Due to the influence of temperature stress, the platform is divided into four parts by two expansion strips along its two symmetrical axes. The four parts of the platform structure will take place serious torsion displacements under dynamic loads, such as wind, wave and current. Then, 78 viscous dampers are installed along the two expansion strips to connect the four parts, in order to improve the vibration resistance capacity of the whole structure and the temperature deformation will not be restricted at the same time. Analysis results show that the platform structure with viscous dampers can greatly eliminate the torsion displacement and effectively reduce the displacement, velocity and acceleration responses under offshore environmental loads.