Impact and vibration method for measuring natural frequency of bridge lower structure

A technology of natural frequency and impact vibration, which is applied in the field of measuring the natural frequency of the bridge substructure, which can solve the problem of not giving time-domain signal interception and superposition to eliminate signal noise, not giving the phase spectrum of the shock response signal, and not being able to measure the bridge pier Self-vibration frequency and other issues, to achieve the effect of simple operation, convenient and quick test

Inactive Publication Date: 2006-07-19
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0003] The "Journal of Beijing Jiaotong University" published in February 2005, Volume 29, Issue 1 "Shock Vibration Test Method for Testing the Natural Frequency of Existing Bridge Piers and Abutments", described the basic principles and implementation steps of measuring the natural frequency of bridge piers by shock vibration. A brief introduction and application examples are given,

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  • Impact and vibration method for measuring natural frequency of bridge lower structure
  • Impact and vibration method for measuring natural frequency of bridge lower structure
  • Impact and vibration method for measuring natural frequency of bridge lower structure

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Embodiment Construction

[0057] The present invention will be further described in conjunction with accompanying drawings.

[0058] 1. Overview of shock vibration method.

[0059]The basic principle of the impact vibration method is to hit the bridge pier with a heavy hammer, measure the vibration response of the bridge pier and analyze it to obtain its natural frequency. Hit the top of the pier with a heavy hammer to measure the response of the bridge such as velocity and acceleration. In order to improve the signal-to-noise ratio of the signal, multiple hits are usually performed, and the noise is eliminated by superimposing the recorded waveforms to obtain an accurate response waveform. Data processing and analysis: read the response waveform, perform Fourier analysis, determine the Fourier spectrum, and then combine the amplitude spectrum and phase spectrum to determine the natural frequency of the bridge.

[0060] Requirements for signal acquisition equipment: use high-sensitivity speed sensors...

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Abstract

The invention relates to an impulse vibrating method for testing the bridge substructure natural frequency of vibration which uses avoirdupois weight to stroke the pier and tests the vibrating response of the pier to analyze and compute the natural frequency of vibration. It uses avoirdupois weight to stroke the pier top part and tests the speed and hastens response of the bridge. It usually dose multi-stroke and uses the recording wave mode superposition to dispel the noise to obtain the accurate response wave mode. It reads the response wave mode to do Fourier analysis to ascertain Fourier frequency spectrum and combines with the peak spectrum to ascertain the natural frequency of vibration of bridge.

Description

technical field [0001] The invention relates to a method for measuring the natural vibration frequency of a bridge substructure. Background technique [0002] The natural frequency is an inherent property of the bridge substructure and is determined by the stiffness and mass of the pier system. When the bridge pier is damaged, it is generally believed that the disease only changes the stiffness of the system without changing the quality of the system, so the change of the natural frequency can reflect the change of the stiffness of the bridge pier, that is, the disease. When the bridge pier vibrates laterally, the restraining effect of the beam and the track is very small and can be ignored, so the lateral natural frequency is very sensitive to the disease. Based on the above reasons, using the natural frequency index to judge the soundness of bridge piers has always been a research hotspot at home and abroad. The basic idea of ​​this method is: given the base natural freq...

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Application Information

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IPC IPC(8): G01H17/00G01H1/00G01M7/02
Inventor 夏禾西村昭彦战家旺齐琳
Owner BEIJING JIAOTONG UNIV
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