Hydrodynamic Effect of High Pier Bridges in Deep Water under Near-Field and Far-Field Earthquakes
In order to study the influence of hydrodynamic effect on the seismic performance of high pier bridges in deep water under near-field and far-field earthquakes,and clarify the necessity of considering dynamic water pressure in the seismic performance analysis of high pier bridges in deep water,this paper takes a typical long-span continuous rigid frame bridge with high piers in deep water as an example to establish its non-linear dynamic analysis model based on OpenSees.The non-linear seismic response analysis of the bridge under different water depths is carried out by simulating the pier-hydrodynamic interaction through the added mass method,and representative near-field and far-field ground motion records are selected from the PEER database to compare and study the influence of dynamic water pressure effect on the seismic performance of high pier bridges in deep water under near-field and far-field earthquakes.The research shows that no matter under near-field or far-field earthquakes,the pier-water interaction will significantly magnify the seismic response of the bridge structure.Under near-field seismic action,the change rates of pier top displacement and pier bottom curvature can reach 64.77％and 156％respectively;compared with far-field seismic action,pier-water interaction has a more significant impact on the seismic performance of high pier bridges in deep water under near-field seismic action.The coupling effect of near-fault ground motion and pier-water interaction shall be fully considered in the seismic performance analysis of high pier bridges in deep water in near-field areas;under the near-field seismic action,the pier-water interaction will mainly excite the first-order vibration mode of the pier to generate fundamental frequency resonance and increase the damage to the pier bottom,while under the far-field seismic action,the pier-water interaction will excite the higher-order vibration mode of the pier,which will not only increase the damage to the pier bottom but also intensify the damage to the middle and upper parts of the pier body;the seismic performance analysis of high pier bridges in deep water has to consider not only the effect of dynamic water pressure,but also the influence of near-field and far-field ground motion.
high pier bridgehydrodynamic effectseismic performancenear-field and far-field earthquakes
万方数据
维普
