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Bridge damage detection method

A damage detection and bridge technology, applied in the direction of measuring device, elasticity test, machine/structural component test, etc., can solve problems such as limited influence of overall characteristics, unsatisfactory structural effect, and infeasibility.

Active Publication Date: 2018-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Most of the above methods need to compare with the information in the undamaged state of the structure to identify the damage, but for the existing structure, it is difficult to obtain the structural feature information in the undamaged state, and it is not feasible
For this problem, some filtering methods are used to process the existing modal data information to obtain undamaged information, but there is no substantial breakthrough in the quality of damage detection results, and accurate modal information of the actual structure needs to be obtained
[0005] Generally speaking, due to the limited impact of local damage on the overall characteristics of the structure, the damage detection effect is very sensitive to small changes in structural characteristic parameters, and test errors, recognition errors, test noise, etc. are often unavoidable, which leads to the current damage detection The following two problems generally exist in the method: 1) The characteristic parameter information in the undamaged state is required for reference comparison; 2) Most methods are only feasible in the stage of numerical simulation and model test, and the effect of applying to the actual structure is often unsatisfactory

Method used

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Embodiment 1

[0125] For the damage detection method based on the influence line, the calculation and analysis of the numerical simulation dynamic response of the 2-axle vehicle crossing the bridge is carried out. The parameters of the vehicle model involved in the calculation are shown in Table 1:

[0126] Table 1. Vehicle parameters for numerical calculations

[0127]

[0128] The main parameters of the simply supported girder bridge used in the numerical simulation include: bridge length L b =16m, bending stiffness EI=4.36×109N·m2, linear density ρ=1.07×104kg / m, damping ratio 0.02. Two damage situations are considered in the numerical simulation, single damage: l s =6.5m, δ=1m, α=0.2; two damages: l s1 = 7.5m and l s2 =11.5m, δ 1 = 1m, α 1 = 0.3, δ 2 = 1m, α 2 = 0.2. In order to ensure the accuracy of the numerical simulation, a lower average speed of 2m / s is adopted, and the influence of road irregularities is not considered at low speeds. Add a certain white noise signal to...

Embodiment 2

[0138] Model introduction

[0139] A laboratory model test is carried out to further verify the damage detection method based on the bridge influence line of the present invention. The test site layout is as follows Figure 10 , The test components include: bridge model, transverse baffle, loading vehicle, speed acquisition device, displacement sensor and dynamic signal testing instrument. The main girder of the bridge model consists of two independent steel girders, one is a three-span test girder, which is the upper span of 1.5m, the test span of 5m and the outgoing span of 1.5m, and artificial damage is caused on the test span. The other piece is an auxiliary beam, on which a smooth guide rail is fixed to support the "V" wheel of the loading vehicle, so that the "V" wheel of the test vehicle can move linearly along the direction of the guide rail. The two pieces of I-beams are independent of each other, and the lateral spacing of their centerlines is 0.258m, which is cons...

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Abstract

The invention provides a bridge damage detection method. Through field experiments, the bridge bottom testing point flexibility response due to bridge passing by a vehicle can be obtained through test; then, the vehicle axle information is combined; a multi-section function model is introduced; a flexibility influence line (the influence line includes relevant information of the bridge damage) ofthe test point through mathematical inversion; on the basis of the test point position, the base function-non-damaged base function capable of reflecting non-damaged state is built; the damage index is built by combining the flexibility influence line and the non-damaged base function; the damage positioning can be performed through the damage index curve local peak value point. The base functioncapable of describing the damage degree is built according to the recognized damage position information, and is called as the damage base function; the bridge practical flexibility influence line andthe non-damaged base function and the damage base function are built in a combined way; through the least square fitting collation, the effective recognition on the damage degree is realized. The problem of non-damaged state information requirement of the exiting bridge damage detection method is solved. The test is simple; the test data information quantity is great; high practical significanceand values are realized.

Description

technical field [0001] The invention relates to a bridge damage detection method, belonging to the technical field of civil engineering applications. Background technique [0002] Knowing the change of structural damage state, so that the damage accumulation can be detected before it reaches the level of threatening the safety of the structure, is not only related to the safety of the structure, but also has important significance for deciding whether to repair the structure and when to repair it. In the field of bridge health monitoring, the most attention is the extraction of damage features, and structural damage detection is the core issue related to its safety. [0003] Damage detection methods based on structural dynamic characteristics (based on vibration) have been widely used in the past two decades. Typical damage detection methods are based on modal parameters (frequency, mode shape, damping ratio, strain mode, etc.) and their branches. . These vibration-based n...

Claims

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Application Information

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IPC IPC(8): G01M5/00
Inventor 王宁波黄天立李东平
Owner CENT SOUTH UNIV
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