摘要
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.
A comparative study was performed on the calculation methods of earthquake hydrodynamic pressure between Chinese and Japanese seismic codes of bridges through a calculation example of a deepwater pier,and the similarities and differences of both the methods were analyzed.A huge difference was obtained from both the results.The earthquake hydrodynamic pressure of a pier in deep water was calculated by numerical simulation and the distribution of pressure along the pier height was investigated.A finite element model of the 260-meter-span Ushine Bridge was built and an added mass method was applied to the model to study the influence of earthquake hydrodynamic pressure on the performance of the whole bridge. The results showed that the displacement and moment obtained by the added mass method was rather more than those without consideration of water. In the performance-based design theory of deepwater bridges and its application field, more studies were needed on the problem of the interaction between piers and water.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2009年第9期1086-1094,共9页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金重大研究计划资助项目(No.90715007)
关键词
深水桥梁
附加质量法
动水压力
性能设计
deepwater bridge
added mass
hydrodynamic pressure
performance-based design
