考虑止水结构弹性的大型弧形闸门振动分析

王思莹; 唐厚佳; 黄涛; 钱军

doi:10.11988/ckyyb.20231306

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raybet体育在线院报 ›› 2025, Vol. 42 ›› Issue (3) : 171-177. DOI: 10.11988/ckyyb.20231306

水工结构与材料

考虑止水结构弹性的大型弧形闸门振动分析

王思莹 ¹ ,
唐厚佳 ¹ ,
黄涛 ² ,
钱军 ²

作者信息 +

Vibration Analysis of Large Scale Radial Gate Considering the Elasticity of Water Stop Structures

Author information +

文章历史 +

摘要

为给某大型水电站的安全监测提供参考,使用有限元计算软件ANSYS对其坝体表孔弧形闸门进行了振动特性分析,主要考察了止水结构弹性对该闸门振动模态及自振频率的影响。分析表明:止水结构弹性对闸门的振动特性具有一定程度的影响,与不考虑止水结构弹性的计算结果相比,部分与闸门两侧约束条件关系较大的振型所对应的频率数值可能相差46.80%;在一定范围内,表征止水结构弹性的基础刚度系数越小,同种振型对应的振动频率越低;基础刚度系数取0.1~0.2 N/mm³时可以得到与原型观测的振动响应主频相符合的结果。研究提出了表征闸门止水结构弹性的方法,为相关系数的选取准则积累了基础数据,可为该水电站安全监测和其它工程闸门的振动分析提供一定参考。

Abstract

To offer a reference for the safety monitoring of a large-scale hydropower station, we conducted a vibration characteristics analysis of surface radial gate of the dam using finite element calculation software ANSYS. We primarily investigated how the elasticity of water stop structures affects the vibration modes and natural frequency of the gate. The analysis reveals that the elasticity of water stop structures has a certain degree of influence on the gate’s vibration characteristics. Compared with the calculation results neglecting the elasticity of water stop structures, the frequencies of some vibration modes closely related to the constraint conditions on both sides of the gate can differ by up to 46.80%. Within a certain range, as the foundation stiffness coefficient which characterizes the elasticity of water stop structures decreases, the vibration frequency of the same vibration mode declines. When the foundation stiffness coefficient ranges from 0.1 to 0.2 N/mm³, the simulation results align with the observed prototype gate’s vibration response. Additionally, we also proposed a method to quantify the elasticity of water stop structures, providing basic data for selecting correlation coefficient values, and potentially offering a reference for the safety monitoring of the studied hydropower station and the vibration analysis of gates in other projects.

导出引用

王思莹, 唐厚佳, 黄涛, 等. 考虑止水结构弹性的大型弧形闸门振动分析[J]. raybet体育在线院报. 2025, 42(3): 171-177 https://doi.org/10.11988/ckyyb.20231306

WANG Si-ying, TANG Hou-jia, HUANG Tao, et al. Vibration Analysis of Large Scale Radial Gate Considering the Elasticity of Water Stop Structures[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(3): 171-177 https://doi.org/10.11988/ckyyb.20231306

中图分类号： O327 (结构振动)

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https://doi.org/10.11988/ckyyb.20160325

摘要

针对弧形闸门安全评价中采用的闸门单体计算模型过于简化的问题,应用有限元软件ANSYS对比分析了惯用的闸门单体结构模型与考虑止水摩阻及支铰和牛腿间直接作用的闸坝一体化模型在全闭和瞬间开启2种工况下的静动力特性。以闸坝一体化模型为准,在静力分析方面,在全闭工况时单体模型下框架主横梁的最大位移及等效应力分别偏大108.5%和67.1%,支臂内力偏大52.8%,单体模型下框架极不经济;在瞬间开启工况时单体模型上框架主横梁的最大位移及等效应力偏差分别为-10.1%和-21.2%,支臂内力偏小8.1%,单体模型上框架极不安全。在动力分析方面,止水及流固耦合作用使闸坝一体化模型的弧门前10阶频率最大下降48%,远离了流激振动的主频区,利于弧门的动力稳定。结果表明:合理弧形闸门结构安全评价的模型应为校核水位瞬间开启工况下的闸坝一体化模型,采用此工况及模型才能确保结构分析的正确性,实现闸门结构安全性与经济性的统一。

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Zheng-zhong

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Bao-hui

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https://doi.org/10.11988/ckyyb.20160325

本文引用 [1] 摘要

In view of the excessive simplification of single gate calculation model in safety assessment of radial gate, we compared and analyzed the static and dynamic characteristics between conventional single gate model and gate-dam system model considering friction of seal and the direct action between hinge and bracket under fully closed condition and instantaneously opening condition. Gate-dam system model was taken as standard. In static analysis, the maximum displacement and equivalent stress of main beam of lower frame for single gate model under fully closed condition are 108.5% and 67.1% larger, respectively. And internal force of arm is 52.8% larger. As a result, the lower frame of single gate model is very uneconomical. The maximum displacement and equivalent stress of main beam of upper frame for single gate model under instantaneously opening condition are 10.1% and 21.2% smaller, respectively. And the internal force of arm is 8.1% smaller. Therefore the upper frame of single gate model is very insecure. Moreover in dynamic analysis, the first ten natural frequencies of gate-dam system decreases 48% maximally with peripheral sealing and fluid-structure interaction, dodging the dominant frequency region of vibration excited by flow. It is beneficial to the dynamic stability of radial gate. Results show that reasonable model for safety assessment of radial gate should be gate-dam system model at check water level under instantaneously opening condition, which could ensure the validity of structural analysis and coordinate between safety and economy of gate structure.

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