桩土作用对渡槽动力特性影响分析
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摘要
现有的渡槽数值研究中,都将结构底部作刚接的简化处理,人为地增大了结构的刚度,与实际情况不相符合。本文基于势流体假设建立渡槽-水流固耦合二维联体式渡槽模型,分别计算比较刚性地基约束情况和考虑桩土作用的弹性地基约束情况下的渡槽结构在不同水深工况下的计算结果,分析各工况下土-结构相互作用的影响变化。结果表明,槽内水体作用和槽底桩土作用均使结构自振频率降低,并且前者对后者的影响不容忽视。
In existing numerical study of aqueduct,a simplified treatment of the boundary conditions of the bottom of the structure artificially increase the stiffness of the structure which is not consistent with the actual situation.This paper analyzed the effect to the dynamic characteristics of the aqueduct when considering pile-soil interaction by calculating an aqueduct model based on the potential fluid assumption. The activators under different conditions which can affect the performance of the pile-soil interaction were also investegated.The results show that:Both the coupling reaction between the aqueduct and water and the pile-soil interaction reduce free vibration frequency of the structure,and also the influence of the former on the latter is indispensable.
In existing numerical study of aqueduct,a simplified treatment of the boundary conditions of the bottom of the structure artificially increase the stiffness of the structure which is not consistent with the actual situation.This paper analyzed the effect to the dynamic characteristics of the aqueduct when considering pile-soil interaction by calculating an aqueduct model based on the potential fluid assumption. The activators under different conditions which can affect the performance of the pile-soil interaction were also investegated.The results show that:Both the coupling reaction between the aqueduct and water and the pile-soil interaction reduce free vibration frequency of the structure,and also the influence of the former on the latter is indispensable.
引文
[1]邵岩,赵兰浩,李同春.考虑流固耦合的渡槽动力计算方法综述[J].人民黄河.2005,27(11):55-56
[2]隋严春,肖盛燮,李放,等.钢管砼拱桥模型构建及自振特性对比分析[J].重庆交通大学学报.2007,26(6):10-14
[3]王浩,杨玉冬,李爱群,等.土-桩-结构相互作用对大跨CFST拱桥地震反应的影响[J].东南大学学报.2005,35(3): 433-437
[4]刘金云,陈健云.势流体与N-S流体的应用及比较研究[J].人民长江.2009(20):27-31
[5]谢祚水.计算结构力学[M].武汉:华中科技大学出版社.2004: 245-246
[6]JTG D63-2007.公路桥涵地基与基础设计规范[S].北京:人民交通出版社,1996
[2]隋严春,肖盛燮,李放,等.钢管砼拱桥模型构建及自振特性对比分析[J].重庆交通大学学报.2007,26(6):10-14
[3]王浩,杨玉冬,李爱群,等.土-桩-结构相互作用对大跨CFST拱桥地震反应的影响[J].东南大学学报.2005,35(3): 433-437
[4]刘金云,陈健云.势流体与N-S流体的应用及比较研究[J].人民长江.2009(20):27-31
[5]谢祚水.计算结构力学[M].武汉:华中科技大学出版社.2004: 245-246
[6]JTG D63-2007.公路桥涵地基与基础设计规范[S].北京:人民交通出版社,1996
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