Rapid damage detection method for three-story foundation isolation system based on incomplete measurement

Abstract

The invention discloses a rapid damage detection method for a three-layer-of-base shock isolation system on the basis of incomplete measurement and belongs to the field of structural health monitoring. The method disclosed by the invention comprises the following steps: according to site actual conditions and theoretical requirements of the three-layer-of-base shock isolation system, determining positions of exciting points and vibration response measurement points in the shearing direction of the system; arranging acceleration sensors on the selected system measurement points to form a sensor network; carrying out effective excitation on the system at the selected exciting points and simultaneously measuring acceleration response data of the system; carrying out recursive solving on the measured acceleration response data to obtain actual structure parameter information of the system, comparing the actual structure parameter information of the system with parameter information of the undamaged system, calculating a damage index and completing rapid damage detection on the three-layer-of-base shock isolation system. Compared with the prior art, quantitative detection on the three-layer-of-base shock isolation system can be rapidly and conveniently implemented by a small amount of measurement information.

Description

technical field [0001] The invention relates to a damage detection method, in particular to a rapid damage detection method for a three-story foundation isolation system based on incomplete measurement, and belongs to the technical field of structural health detection. Background technique [0002] With the continuous improvement of people's requirements for the safety and reliability of engineering structures, the technology of structural health detection and diagnosis has been developed rapidly. In recent years, natural disasters such as earthquakes, typhoons and floods have occurred more frequently. In order to resist these natural disasters and ensure the safety of people's lives and property, basic seismic isolation systems with strong seismic isolation effects and high seismic safety have been widely used. . This system works better on low-rise engineering structures, and the three-story base isolation system is one of the mainstream structures. However, after a disa...

AI Technical Summary

Problems solved by technology

For example, the Kalman filter system damage detection method based on incomplete measurement can be applied to linear and hysteretic nonlinear systems, and the parameter information of the system can be calculated by using part of the output response information. However, the nonlinear state equation is required in the solution process Linearization, after linearization, some of the poles of the parameters to be identified in the state equation fall on the imaginary axis, which will cause the solution to become unstable easily. In addition, due to the linearization process, when the initial parameter estimates exceed the convergence range , the solution may not converge, that is, the method has high requirements for the selection of relevant initial values, requires too much human experience intervention, and the stability of the algorithm is generally

Another example is the sequential nonlinear least squares estimation system damage detection method based on incomplete measurement. This method avoids some shortcomings in the above example, but due to the use of Newmark–β technology, the estimation accuracy of the state vector is less affected by the sampling frequency. Large, so that the method is limited in practical engineering applications. In addition, when the noise is relatively large, the estimated state quantity will produce data drift that is difficult to eliminate online, which will also affect the accuracy of system parameter identification results.

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