Method for testing bridge strain flexibility matrix

Abstract

The invention discloses a method for testing a bridge strain flexibility matrix, which comprises the following steps of: establishing a finite element model according to a design drawing of a bridge, designing an acceleration sensor arrangement scheme, acquiring vertical vibration acceleration response of the bridge under environmental excitation by using an acceleration sensor arranged on the bridge, identifying basic modal parameters such as a vibration mode and a frequency of a bridge by applying a modal identification method, acquiring a concentrated mass matrix of a structure according to the bridge finite element model, calculating a vibration mode mass normalization coefficient, then normalizing an actually measured vibration mode, calculating a strain vibration mode and a strain flexibility matrix of the bridge by utilizing the normalized vibration mode, and predicting the modal strain of the bridge so that the target of conveniently and quickly measuring the actual strain of the bridge is achieved.

Description

technical field [0001] The invention relates to a method for testing a bridge strain flexibility matrix, and belongs to the technical field of bridge bearing capacity detection and evaluation. Background technique [0002] As a kind of local measurement information, strain is the embodiment of bridge strength. It has the advantages of high precision and sensitivity to damage, and is an important information for evaluating bridge performance. However, the strain measurement operation is cumbersome, and is greatly affected by factors such as temperature, measuring instruments, and acquisition equipment. In actual measurement, the strain value is often unable to be accurately obtained, and the strain value is usually relatively small, so it is impossible to accurately measure the strain of the bridge under load. modal. Therefore, the current measurement of bridge strain is still to measure the strain response of the bridge under load by installing test instruments at key posit...

AI Technical Summary

Problems solved by technology

However, the strain measurement operation is cumbersome, and is greatly affected by factors such as temperature, measuring instruments, and acquisition equipment. In actual measurement, the strain value is often unable to be accurately obtained, and the strain value is usually relatively small, so it is impossible to accurately measure the strain of the bridge under load. modal

Therefore, the current measurement of bridge strain is still to measure the strain response of the bridge under load by installing test instruments at key positions, which consumes a lot of time, material and financial resources

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