Structural dynamic and static parameter uncertainty quantitative analysis system only utilizing output response

Abstract

The invention discloses a structure dynamic and static parameter uncertainty quantitative analysis system only utilizing output response. The uncertainty of dynamic and static parameters of a structure is quantitatively calculated based on a fast Bayesian method and a quality change method. For a single mode of a certain resonant frequency band, a four-dimensional numerical optimization problem issolved to obtain optimal estimation and a covariance matrix of mode parameters; through first-order perturbation analysis, a vibration mode scaling coefficient, a quality normalization vibration mode, a flexibility matrix and a covariance matrix of prediction displacement can be obtained; and the confidence intervals of the displacement vibration mode, the flexibility matrix and the deflection can be further calculated. Only environmental vibration data is used; expensive manual excitation and load input measurement are not needed, the unique advantage of structural detailed dynamic characteristic recognition the same as that under the input and output thought is achieved, and the method has the advantages of being short in test time, free of traffic closure, high in test precision and high in noise resistance and has good prospects of being widely applied to actual bridge performance evaluation.

Description

technical field [0001] The invention relates to a quantitative analysis system for structural dynamic and static parameter uncertainty using only output responses, and belongs to the technical field of structural health monitoring. Background technique [0002] The infrastructure of countries around the world is huge and plays an important role in national economic life. On the other hand, during the long service period of infrastructure, due to environmental erosion, daily service loads and even overloading, the performance of the structure will gradually degrade and may be attacked by extreme natural disasters such as earthquakes and typhoons at any time. The performance evaluation of many bridges to ensure structural safety and optimize maintenance and management costs is a common issue that needs to be solved urgently at home and abroad. Contents of the invention [0003] Environmental vibration testing is an important method for structural health monitoring, which ha...

AI Technical Summary

Problems solved by technology

The method of the invention overcomes the shortcomings that the traditional health monitoring data processing method cannot effectively support structural safety assessment and the existing shock vibration test method needs to use artificial excitation devices, directly uses the environmental vibration data, has the advantages of low cost, less time required for testing and anti-noise Strong ability, so it has a good prospect of being widely used in actual bridge performance evaluation

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