A time-varying damaged bridge experimental device and its experimental method

Abstract

The invention relates to a time-varying damage bridge experiment device. The device comprises a main bridge panel. The main bridge panel is provided with several damage holes spaced apart by a certaindistance. Electromagnets which are cooperated with the damage holes and whose magnetism can be controlled through energization and outage are arranged in the damage holes. The upper end surface of the main bridge panel is provided with a sensor used for measuring a bridge deformation displacement, a deformation speed and a deformation acceleration. The upper end surface of the main bridge panel is provided with a movable dolly capable of loading an object. The front end surface of the movable dolly is provided with a draw hook. The draw hook is provided with a pulling rope. One end of the pulling rope is fixed to the draw hook. The other end of the pulling rope is provided with a variable-speed traction machine. The invention also relates to the experiment method of the time-varying damage bridge experiment device. In the invention, the conditions of a bridge when being subjected to single or multiple time-varying damages, and when load quality changes and a load speed changes can besimulated, and a corresponding deformation displacement, and deformation speed and deformation acceleration data can be detected.

Description

technical field [0001] The invention relates to a time-varying damaged bridge experimental device and an experimental method thereof. [0002] technical background [0003] Over the past 30 years of reform and opening up, my country's bridge engineering construction has entered the forefront of the world both in terms of overall scale and technological level. However, according to statistical analysis, more than one quarter of the bridges have structural defects, varying degrees of damage and hidden dangers of functional failure, and the important bridges are in urgent need of safety monitoring, evaluation, maintenance and reinforcement. Generally speaking, the bridge structure during service will inevitably suffer local or overall damage under the external environment, working load and extreme load. In order to ensure the safety, integrity, applicability and durability of the structure, the service bridge It is particularly necessary and urgent for structures to adopt effec...

AI Technical Summary

Problems solved by technology

Although a large number of scholars at home and abroad have carried out a large number of tests and numerical simulations for bridge damage identification, most of these are under ideal conditions, for example, under a completely noiseless condition, under a seismic excitation or impact load, Under prefabricated damage conditions, etc., most of the existing devices are to simulate the damage identification of bridges under static force, but due to the complexity of actual bridge structures and environmental conditions, it is difficult to realize the research of real conditions

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