Seismic Response Analysis Of Deep Water Piers Considering The Interacter Of Pier-water

The development of the transportation industry has promoted by the rapid economic growth, nowadays,china has built a large number of bridge which has across the river and ocean,the underwater segment of bridge piers will interact with water when the earthquake occurs. This interaction will not only change the vibration characteristics of the bridge, but also affect the dynamic response of bridge, therefore, the pier-water Coupling effect is necessary to be considered in the seismic design of deep water bridges. From the current literature on the seismic research of deep water piers, most of the researches are force on the solid bridge piers, the calculation theory and the seismic response characteristics of the hollow piers’ study are few.This paper is based on the current calculation theory and analysis method about the interaction between water and structure, which has considered the effect of wall thickness and water depth, the main contents and conclusions are as follows:1. The key problems and the selection of seismic wave for the numerical models of seismic response of bridge piers are introduced, the establishment of three dimensional numerical analysis models considering hydrodynamic effect which has based on Potential fluid method and Morison equation method are introduced.2. Effect of the inner water, outer water and taking into account both inner water and outer water on seismic response of bridge pier in deep water has calculated based on Fluid element method. The calculation results show that the existence of water not only changes the natural vibration characteristics of the bridge piers, but also decreases the natural frequency, and changes the dynamic response of the bridge piers; When the piers under the same water depth, taking into account both inner water and outer water have greatest effect on seismic response of bridge piers, only considering the inner water have minimum impact on seismic response of bridge piers; the influence of considering inner water, outer water and taking into account both inner water and outer water on seismic response of bridge pier in deep water will have varying degrees of increase when the wall thickness decreases, and only considered the inner water have most effect on deep water piers, the effects of taking into account both inner water and outer water is take second place.3. The seismic response of the circular solid piers with different water depth is analyzed which are based on the Morison equation method, the related literature method and the fluid element method, and the calculation results of the three methods are compared, with the calculation results of the fluid element method as reference, the proposed method is proved to have good accuracy. Natural vibration characteristics and dynamic response of deep water hollow bridge piers is analyzed by considered outer water which is based on this proposed method and the fluid element method, calculation results show that the proposed method can be used to solving outer water influence on hollow bridge pier seismic response, and with good accuracy.