基于有限测点的高拱坝原型整体动位移场反演研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (10) : 1-8.

论文

李火坤1,2, 邓冰梅1, 魏博文1, 黄锦林3, 符晓4

作者信息 +

Study on the Whole dynamic displacement field inversion of prototype high arch dam based on the limited measuring points

Li Huokun 1,2,DENG Bingmei1, WEI Bowen1,Huang Jinlin 3,Fu Xiao4

Author information +

文章历史 +

摘要

坝身泄洪的拱坝振动位移均方差是反映坝体振动强烈程度的重要指标，由于开展拱坝原型振动测试的测点有限，难以全面准确反映拱坝坝体的整体振动响应场分布特性，仅利用有限测点的动位移均方差进行坝体振动安全评价显得不够全面和具体，因此通过有限测点的实测响应反演出整个坝体结构的动位移场具有重要意义。本文以二滩高拱坝为工程实例，对其开展了原型泄洪振动测试，通过布置于坝体上的有限测点的原型实测动位移响应，基于遗传算法和有限元模态分析对该拱坝原型整体动位移场进行了反演，并给出了拱坝原型动位移场反演的具体流程图；反演结果表明，本文仅利用了坝体顶拱拱圈的7个动位移响应测点实测值反演出了整个拱坝在泄洪工况下的动位移场，且反演结果与实测结果较为吻合，本文方法为高拱坝的泄洪振动安全的正确评估提供了新的技术手段。

Abstract

The mean square error of arch dam dynamic displacement during the flood discharge period is an important indicator for evaluating the intensity of vibration. It is difficult to reflect the whole vibration response distribution characteristics accurately based on the limited dynamic test measuring points and also it is not comprehensive and concrete to evaluate the dam vibration safety with the limited measuring point only. So it is of great significance to inverse the whole dynamic displacement field of arch dam based on the limited measuring point dynamic response. In this paper, taking Ertan high arch dam as engineering example, the dam vibration test under the flood discharge excitation is executed. Through the dynamic displacement response of limited measuring points which arranged on the prototype arch dam, the whole dynamic displacement field of the arch dam is inversed based on the genetic algorithm and finite element modal analysis. And also the specific flow chart of the arch dam prototype dynamic displacement field inversion is given in this paper. The inversion results show that the entire arch dam dynamic displacement field is obtained through only seven dynamic displacement response measuring point which arranged on top arch of the dam. Simultaneously, the inversion values and the measured value are in good agreement. This method provides a new technique for the reasonable assessment of high arch dam during the flood discharge period.

导出引用

李火坤1,2, 邓冰梅1, 魏博文1, 黄锦林3, 符晓4. 基于有限测点的高拱坝原型整体动位移场反演研究[J]. 振动与冲击, 2016, 35(10): 1-8

Li Huokun 1,2,DENG Bingmei1, WEI Bowen1,Huang Jinlin 3,Fu Xiao4. Study on the Whole dynamic displacement field inversion of prototype high arch dam based on the limited measuring points[J]. Journal of Vibration and Shock, 2016, 35(10): 1-8

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