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通过一个深水桥墩实例对中国与日本桥梁抗震规范的地震动水压力计算方法进行比较研究,分析规范关于动水压力计算的异同点,计算表明两者结果相差较大.对桥墩的动水压力进行数值模拟计算,考察动水压力沿深水桥梁高程的分布.为研究动水压力对桥梁整体结构动力特性的影响,以主跨260 m的牛根大桥为背景建立有限元计算模型,采用附加质量法进行计算.结果表明,附加质量法求得的位移和弯矩比不考虑动水作用的情况有较大增幅,也表明动水压力对桥梁的性能有较大的影响.在深水桥梁的性能设计理论与应用领域中,水与桥墩的相互作用问题有必要进行进一步的研究.
Through a deepwater bridge piers example, the calculation method of seismic dynamic water pressure of bridge between China and Japan is compared and analyzed, and the similarities and differences of hydrodynamic pressure calculation are analyzed. The results show that the difference between the two results is large. Numerical simulation is carried out to investigate the distribution of hydrodynamic pressure along the elevation of the deepwater bridge.In order to study the influence of hydrodynamic pressure on the dynamic characteristics of the bridge structure, a finite element model is established based on the Aurora Bridge at 260 m of the main span. The results show that the displacement and the moment calculated by the additional mass method have a larger increase than those without considering the effect of hydrodynamics and also show that the hydrodynamic pressure has a great influence on the performance of the bridge.The design of the performance of the deepwater bridge In the field of theory and application, the interaction between water and piers needs to be further studied.