Research status and prospect of seismic response of deep-water bridge pier

The dynamic interaction between deep water bridge piers and surrounding water under seismic excitation was analyzed. The mechanisms and calculation methods of hydrodynamic pressure and the analysis methods of water-structure dynamic interaction were summarized. The seismic response characteristics and the influence factors of deep-water bridge piers and the research progress of underwater shaking table test were studied. The calculation methods of hydrodynamic pressure in national standards were also discussed. Research result indicates that the influence of hydrodynamic pressure on the seismic response of bridge pier cannot be neglected in the seismic design of bridges, because it reduces the natural frequency of bridge pier and increases the seismic response of bridge pier. The forms of the bridge piers adopted in current research are simplified and limited. The seismic response of deep-water bridge based on the bridge pier system and bridge system should be studied. In terms of calculation of hydrodynamic pressure under seismicity, most of the current national standards are based on the Morison equation, but the application range is still unclear. It is necessary to carry out the in-depth study on application range of Morison equation and revised methods and to propose an accurate and convenient method for calculating hydrodynamic pressure under seismicity. Currently, the underwater shaking table tests mostly focus on the influence of hydrodynamic pressure on the seismic responses of bridge piers and piles, and the responses are mostly within the elastic range. The nonlinear responses and failure modes of deep-water bridge piers under severe seismicity should be studied. There are few studies on the dynamic responses of deep-water bridge piers under combined seismicity and wave action, and the interaction mechanisms between bridge piers and water under combined action of seismicity, wave and current should be researched out in depth. There is a lack of research on the seismic response of whole bridge structure. It is necessary to carry out whole deep-water bridges analysis and multi table underwater shaking table test. © 2019, Editorial Department of Journal of Traffic and Transportation Engineering. All right reserved.