Dam and foundation elastic modulus dynamic inversion method based on prototype vibration response

A vibration response and response surface model technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as large environmental background noise and difficult vibration testing, and achieve the effect of improving inversion efficiency and accuracy

Active Publication Date: 2019-06-07
NANCHANG UNIV
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Problems solved by technology

Among them, the vibration mode data can better reflect the overall mechanical characteristics of the structure, but for high arch dams with high stiffness, the on-site vibration test is more difficult, and is greatly affected by the environmental background noise, and only the vibration mode data of several lower orders is reliable, there are still many key technologies to be broken through

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  • Dam and foundation elastic modulus dynamic inversion method based on prototype vibration response
  • Dam and foundation elastic modulus dynamic inversion method based on prototype vibration response
  • Dam and foundation elastic modulus dynamic inversion method based on prototype vibration response

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Embodiment 1

[0052] Embodiment one: see figure 1 , figure 2 .

[0053] figure 1 It is a flow chart of the method for elastic model inversion of dam and foundation partition based on the actual vibration of the prototype according to the present invention. In this embodiment, an arch dam is taken as an example. The dam is a concrete hyperbolic arch dam with discharge from the dam body. Such as figure 2 shown. The crest elevation of the arch dam is 1205m, the maximum dam height is 240m, the arc length of the dam crest is 774.65m, the top thickness of the arch crown beam is 11m, the bottom thickness is 55.74m, the arc-height ratio is 3.23, the span-height ratio is 2.83, and the thickness-height ratio is 0.232. In the 2#~38# dam section on the dam crest, a radial dynamic displacement sensor is arranged every 5 dam sections, numbered from left to right are B1~B7, which are used to test the radial vibration displacement response on the arch ring; at 20 #The dam section arranges four sens...

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Abstract

The invention relates to the technical field of dam operation safety monitoring and management, in particular to a dam and foundation elastic modulus dynamic inversion method based on prototype vibration response. The method comprises: based on actual measurement vibration response of a dam prototype, a random subspace method based on singular entropy order determination is adopted to identify working modal parameters of a dam in the operation period, a response surface model between a high arch dam and foundation subarea elastic modes and modal parameters is constructed based on the responsesurface theory, and the response surface model is used for replacing a finite element model; based on modal parameters of prototype actual measurement response recognition and modal parameters calculated by a response surface model, an optimal mathematical model of dam and foundation subarea elastic mode dynamic inversion is established, the mathematical model is subjected to optimization solvingby adopting a genetic algorithm, and an optimal combination of elastic modes of all subareas is obtained through inversion; The method provides a brand new idea for inversion of the running period damand the foundation subarea elastic model.

Description

technical field [0001] The invention relates to the technical field of dam operation safety monitoring and management, in particular to a method for inversion of elastic model dynamics of dams and foundations based on prototype vibration responses. Background technique [0002] China's arch dams for flood discharge have the characteristics of high water head and large flow. During flood discharge, the high-speed water flow has a huge impact on the operation safety of the arch dam, and in severe cases, it will cause structural damage. Therefore, the research on dam reliability detection and safety evaluation is of great significance to ensure the long-term safe operation of the dam. In the field of safety monitoring and health diagnosis of high arch dams, the determination of material parameters during the operation period is very important, which is an important parameter to measure the safe operation of structures. At present, it is a relatively reliable method to use the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李火坤王刚魏博文
Owner NANCHANG UNIV
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