联体式渡槽流固耦合动力特性分析
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摘要
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的渡槽结构在不同水深工况下的计算结果,分析了联体式渡槽的动力特性以及土桩结构相互作用对上部结构动力特性的影响。计算结果表明:槽内水体使结构自振频率降低,并且随着水深的加大频率降低越多;考虑桩-土相互作用使渡槽结构变柔,自振周期变长,因此在渡槽的静动力计算分析中有必要考虑桩土作用。
Based on the potential fluid assumption to build two-dimensional combined aqueduct model with fluid-solid coupling,the results of rigid foundation model and elastic foundation model are calculated and compared so as to analysis the dynamic characteristics of combined aqueduct and the effect on the upper structure when considering the pile-soil interaction.The results show that the coupling reaction between the aqueduct and water would reduce the free vibration frequency of the structure,and the reducing value would raised with water depth increasing;In the static and dynamic analysis of aqueduct,the pile-soil interaction should be considered because it could make the structure become soft and the natural period become prolonged.
Based on the potential fluid assumption to build two-dimensional combined aqueduct model with fluid-solid coupling,the results of rigid foundation model and elastic foundation model are calculated and compared so as to analysis the dynamic characteristics of combined aqueduct and the effect on the upper structure when considering the pile-soil interaction.The results show that the coupling reaction between the aqueduct and water would reduce the free vibration frequency of the structure,and the reducing value would raised with water depth increasing;In the static and dynamic analysis of aqueduct,the pile-soil interaction should be considered because it could make the structure become soft and the natural period become prolonged.
引文
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[2]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.
[3]王博,陈淮,徐伟,等.考虑槽身与槽内水体流固耦合的渡槽地震反应计算[J].水利水电科技进展,2005,25(3):5-7.
[4]叶梅新,陶路,罗如登,等.桩-土-结构相互作用对连续梁桥抗震性能的影响[J].中国西部科技,2007,(12):1-4.
[5]罗国庆,郑凯锋.桩土作用对连续钢箱梁桥结构的影响[J].广东公路交通,2008,(3):12-14.
[6]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,2009,40(20):27-31.
[7]中交公路规划设计院有限公司.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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