THE EFFECT OF DISTANCE BETWEEN SEA ICE AND PIER ON DYNAMIC RESPONSES OF PIER STRUCTURES SUBJECT TO EARTHQUAKE

In icy waters, there are always distances between sea ice and structures due to the wave forces, and the seismic dynamic interaction of sea ice and structures is complicated. On the basis of elastic wave propagation theory and structural dynamics, the paper establishes the fluid-structure coupling dynamic equations of sea ice, water and piers with different distances between sea ice and structures. This paper takes a rectangular pier as an object of study, analyzes the effects of distance between sea ice and the pier on the seismic dynamic responses of the rectangular pier and hydrodynamic pressure. The results show that the distance between sea ice and the pier has little effect on the displacement responses and acceleration responses of the top pier under earthquake, but greatly influence the hydrodynamic pressures and inner forces of the bottom pier. The flexural moments and shear forces achieve the maximum when the distance between sea ice and pier exists and is less than the structure size.