倒虹吸拱式桥梁结构流固耦合模态分析  

Fluid-structure coupling modal analysis of inverted siphon arch bridge structure

作　　者：廖敏慧 李睿[1] 李晓章 崔又文 罗仕庭 LIAO Minhui;LI Rui;LI Xiaozhang;CUI Youwen;LUO Shiting(Kunming University of Science and Technology,Kunming 650500,China;Zhaoyang District Taxation Bureau,Zhaotong 657000,China;China Power Construction Group,Kunming Survey and Design Institute Co.,Ltd.,Kunming 650051,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]云南省昭通市昭阳区税务局,云南昭通657000 [3]中国电建集团昆明勘测设计院有限公司,云南昆明650051

出　　处：《甘肃农业大学学报》2023年第3期210-217,共8页Journal of Gansu Agricultural University

基　　金：国家自然科学基金项目(51568029);云交科2014(A)25。

摘　　要：【目的】由于倒虹吸桥架有压管道内水体水力条件复杂,管内压力波动变化引起的水体振荡会使结构也随之振动。本文通过有限元建模,研究了此类振动现象产生的原因以及对桥架结构的影响。【方法】以昆明市滇中引水工程中的小鱼坝倒虹吸桥梁为例,建立有限元模型,并使用附加质量法和声固耦合法对流固耦合模态进行分析计算。【结果】将两种计算方法的结果进行对比发现,两种方法在低阶振型时动力特性几乎一致;第四阶模态之后,两种方法计算的频率均保持着10%以上的误差,附加质量法的频率一直大于声固耦合法的频率。基于声学的流固耦合求解方法精度较高,同时附加质量法也能满足工程计算需要。【结论】本文的研究结果为水击作用和地震作用下的流固耦合动力响应提供了一定的理论依据和实践价值。【Objective】The complex hydraulic conditions of water bodies in pressure pipeline of inverted siphon bridges can cause vibrations in the bridge structure due to pressure fluctuation.The study aimed to investigate the causes of such vibration phenomena and their impact on bridge structures using finite element modeling.【Method】We took the inverted siphon bridge of Xiaoyuba Dam in the middle Yunnan Water Diversion Project of Kunming as an example,and established a finite element model to analyze and calculate the coupled model of fluid-structure using the additional mass method and the acousticstructural coupling method.【Result】Our results showed that the dynamic characteristics of the two methods were almost the same at lower mode shapes.However,after the fourth-order mode,the frequencies calculated by the two methods differed by more than 10%,with the frequency of the additional mass method always higher than that of the acoustic-structural coupling method.While the acoustic-based fluid-structure coupling method offers higher accuracy,the additional mass method was sufficient for engineering calculations.【Conclusion】This study provides a theoretical basis and practical value for understanding fluid-structure coupling dynamic response under water hammer and earthquake conditions.

关 键 词：倒虹吸桥架结构 流固耦合 有限元模型 模态分析 

分 类 号：TU311[建筑科学—结构工程]