【摘要】 以南京长江三桥南墩为分析对象基于附加质量法对地震动水压力下大跨度桥梁深水基础的动力特性进行分析:包括墩自振特性的研究、墩顶部位移和加速度时程分析以及动水压力沿深水桥墩高程的分布情况,并将结果与南京长江三桥南墩振动台试验结果进行比较。为验证附加质量法的计算结果,建立包含水体的有限元计算模型,对动水压力的影响进行分析。结果表明动水压力对桥梁的动力特性有较大的影响:从动水压力数值上看,随着水深增大动水压力值呈二次抛物线形式增加;就动水压力对墩位移和加速度的影响而言,附加质量法与有限元模拟方法的结果基本吻合。更多还原

【Abstract】 In the present paper,hydrodynamic pressure on southern pile-cap pier of the Nanjing Third Yangtze River Bridge was evaluated with added mass approach to study the dynamical behavior of the pile-cap pier during earthquake in deep water.Vibration properties and dynamic response of this pier as well as the distribution of hydrodynamic pressure along pier were analyzed.A comparison was made between the results from added mass methods and those from a shaking table test on southern pile-cap pier of the Nanjing Third Yangtze River Bridge.Both of them indicate that hydrodynamic pressure must be taken into consideration when researching dynamic responses of piles in deep water.To verify the results from added mass approach,a finite element model of pile group of Nanjing Third Yangtze River Bridge was built for comparison.The results showed hydrodynamic pressure distribution along the pier was in a parabola form and added mass approach has similar accuracy to the finite element method in terms of displacement and acceleration of pile group model.In view of the influence of hydrodynamic pressure on dynamic response of deep water bridge,a evaluation method based on added mass approach is needed to analyze hydrodynamic pressure on deep water bridge.更多还原