CN203299172U - Fretting damage detection system for civil engineering wallboard structure - Google Patents

Abstract

The utility model discloses a fretting damage detection system for a civil engineering wallboard structure. The system is characterized by comprising a detector, a recorder, a controller and a display device, wherein the detector and the recorder are connected to the controller, the controller is connected to the display device, the detector is a moving-coil speed type detector for exploring elastic waves, the detector comprises a simple component detector and/or a three-component detector, and the recorder is a digital seismograph for exploring elastic waves. The system disclosed by the utility model is simple in device, high in efficiency, free from damage to the structure, precise in theory of analysis, high in precision of analytic method and free from influence caused by degree of structural damage and complexity, and provides a novel method for detecting damage of civil engineering structures.

Description

Civil engineering work panel structure fretting damage detection system

Technical field

The utility model relates to a kind of Structural Engineering and detect, the particularly Non-Destructive Testing of panel structure, belong to the Structural Engineering field.

Background technology

Structure in the Service Environment of complexity, will be subject to all effects in load, the weathering of nature and the impact of various sudden external factors, is faced with damage and damage accumulation problem.The accumulation of these damages will certainly cause the usability of structure to reduce or recurring structure destroys.Therefore,, for guaranteeing the safety of structure, need to set up the method for detecting and identifying structural damage, so that the appearance of detecting structure damage as soon as possible, the position that damage occurs and the degree of damage are repaired the generation of the incidents that averts a calamity in real time to structure.The expansion of building along with China's large-scale basis in recent years, the complicated civil engineering structure that maximizes constantly increases, and accident resulting from poor quality of projects also happens occasionally.In addition, Chinese ancient architecture is the model of our east ancient architectural art still not, and is the historical and cultural heritage of whole mankind's preciousness.Therefore have complicated lesion for large and complex structure and structure body, the intricate and roundabout civil engineering structure of display form, need to set up and avoid structure generation harmful effect itself and the method for detection and Identification structural damage quickly and easily.

Nearly two during the last ten years, utilizes non-destructive method to come detection architecture whether to have damage, and damage is positioned and becomes domestic and international academia, engineering circles and very pay close attention to and study active field with assessing.Wherein utilize the variation of structural dynamic characteristic to carry out method and the technology of structural entity damage check, have that signal is easy to extract, detector can be installed to the advantages such as position that people should not approach.Fine motion test does not need the people for applying focus, and its disturbance source is the small vibrations of the earth depths, on structure itself almost without affecting; Fine motion testing apparatus in addition is light and handy, simple to operate, is convenient to apply in large and complex structure.Can infer well the vibration characteristics (eigenwert, ratio of damping, mode of oscillation etc.) of building structure by certain analysis means.Therefore, in theory, but by the kinetic parameter that does not damage model and actual measurement damaged structure, with the mechanical property of detection architecture, reach whether the damage existence is arranged.Utilize the civil engineering work panel structure damage detecting method of fine motion measuring technology and the system just to be based on above characteristic and a large amount of experiments and utility model.The research and development of this technology are for the civil structure damage check provides that a kind of precision is good, efficiency is high, means quickly and easily, and are significant.

The utility model content

The utility model provides a kind of fine motion test macro of civil engineering structure damage check, is mainly used in the panel structure internal injury state Non-Destructive Testings such as brick, concrete.The fine motion method of testing and the system that it will be appreciated by those skilled in the art that damage check provided by the utility model not only can be applicable to the civil engineering work panel structure, can also be applicable to other structure, belong to equally protection domain of the present utility model.

According to an aspect of the present utility model, a kind of fine motion test macro of civil engineering work panel structure damage check is provided, comprise wave detector, registering instrument, controller, display device, wherein, described wave detector and registering instrument are connected to described controller, described controller is connected to described display device, described wave detector is moving-coil speed-type elastic wave exploration wave detector, described wave detector comprises simple component wave detector and/or three-component seismometer, and described registering instrument is elastic wave exploration digital seismograph.

Preferably, also comprise the metope web member, wherein, described metope web member comprises wave detector link and metope link, and described wave detector is connected in the wave detector link of described metope web member.

Preferably, also comprise the test wall, wherein, described test wall is the brick wall body structure, and described wave detector is installed on described test wall by described metope web member, in differing heights and the varying level position on described test wall surface, is provided with a plurality of described wave detectors.

Preferably, the thickness of described test wall is 0.75m.

The utility model utilizes the variation of structural dynamic characteristic to carry out location and the quantitative evaluation of structural entity damage, particularly the natural mode of vibration of structure has comprised more damage information, utilize natural mode of vibration to position structural damage and quantitative evaluation more accurate., by the natural mode of vibration of relatively surveying structure and the natural mode of vibration evaluation structure internal injury degree of not damaging model, have the characteristics such as method simple, intuitive, precision is good, efficiency is high, cost is low.

Compared with prior art, the utility model comprises following beneficial effect at least:

(1) use a plurality of wave detectors to form geophone group, fully hold the whole damage status of structure.

(2) need not explosive source, directly gather the small vibrations of the earth, structure is had no adverse effects.

(3) obtain the frequency characteristic of record data by Fast Fourier Transform (FFT) (FFT).

(4) by the definition loss of rigidity, one-piece construction is carried out the damage quantitative evaluation.

Description of drawings

By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:

Fig. 1 is civil engineering work panel structure damage check fine motion method schematic diagram;

Fig. 2 is the wave detector scheme of installation

Fig. 3 is Fast Fourier Transform (FFT) figure as a result;

Fig. 4 is structure height-amplitude curve;

Fig. 5 is structure height-amplitude ratio curve.

Embodiment

Below embodiment of the present utility model is elaborated.The present embodiment is implemented as prerequisite take technical solutions of the utility model, provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.

In the present embodiment, detected object is the approximately brick wall body structure of 0.75m of thickness, and its building method is along highly different and existing faulted condition complexity, whole damage position and the degree of injury of main detection architecture.As shown in Figure 2, specifically implement as follows:

At first build characteristics and degree of impairment by laying bricks or stones according to structure and a plurality of wave detectors (two components, perpendicular to body of wall and be parallel to body of wall) are set differing heights varying level position from the teeth outwards.Wave detector uses the moving-coil speed-type wave detector (elastic wave exploration wave detector) of natural frequency 4.5Hz; Method to set up adopts and is fixed on surface of wall by equipment; Registering instrument adopts common exploration with seismograph and turns off high cut-off frequency wave filter.

Wave detector be connected with registering instrument complete after, get rid of the interference of near human activity test point, various power sources as far as possible.Sampling interval 0.004s is set, continuous acquisition 150min.

At first filter radio-frequency component more than 10Hz with various artificial and dynamic interferences around eliminating with digital filtering when data are processed, then choose waveform 10 groups of data stably from 150min microtremor observation data, every group of data time band 60s.

At first every group of data choosing are transformed to frequency domain signal to clock signal by fast fourier transform during spectrum analysis, calculate the fourier spectra of measured data, fourier spectra is added the Hanning window 10 times, carry out smoothing (Band=is 0.1Hz approximately) afterwards, fourier spectra to 10 groups of data is weighted on average, just obtains fourier spectra curve shown in Figure 3.Read peak value in curve and corresponding amplitude as excellent frequency and the amplitude of measured data, directly amplitude corresponding to each excellent frequency is converted to structure height shown in Figure 4 and the corresponding relation of amplitude.With each height amplitude and foot observation station amplitude is divided by and minimum section measuring point transverse axis is moved at 0 after, obtain the corresponding relation of structure height and amplitude ratio shown in Figure 5.

Set up not damage structure three-dimensional model according to data such as design and constructions, carry out eigenwert and calculate.

At first 1,2,3 rank modal distribution of contrast test result and corresponding result of calculation, obtain modal distribution change location and variable quantity, is deployed in the distribution plan of structural plan.

This test is reduced to each test zone of structure the system of 3 degree of freedom.Rigidity k1 in system, k2, k3 are unknown quantity, and quality m1, m2, m3 are known constant, and eigenwert ω and vibration shape Y are known test result, by eigenwert calculate ( $\left\{\begin{array}{c}\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">k</figure-callout>}1=\frac{s1Y_{11}+s3Y_{31}+s2Y_{21}}{Y_{11}}\\ \mathrm{<figure-callout\; id="2"\; label="k"\; filenames="DEST\_PATH\_HDA00003593257800031.png,DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">k</figure-callout>}2=\frac{s3Y_{31}+s2Y_{21}}{Y_{21}-Y_{11}}\\ \mathrm{<figure-callout\; id="3"\; label="k"\; filenames="DEST\_PATH\_HDA00003593257800031.png,DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">k</figure-callout>}3=\frac{s3Y_{31}}{Y_{31}-Y_{21}}\end{array}\right.$ ) can obtain rigidity k1, k2, k3, wherein $\left(\begin{array}{ccc}\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">s</figure-callout>}1& 0& 0\\ 0& \mathrm{<figure-callout\; id="2"\; label="s"\; filenames="DEST\_PATH\_HDA00003593257800031.png,DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">s</figure-callout>}2& 0\\ 0& 0& \mathrm{<figure-callout\; id="3"\; label="s"\; filenames="DEST\_PATH\_HDA00003593257800031.png,DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">s</figure-callout>}3\end{array}\right)={\mathrm{\&omega;}}^2\left[M\right],$ [M] is mass matrix $\left(\begin{array}{c}m\end{array}\right)$ $\left(\begin{array}{ccc}1& 0& 0\\ 0& \mathrm{<figure-callout\; id="2"\; label="m"\; filenames="DEST\_PATH\_HDA00003593257800031.png,DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">m</figure-callout>}2& 0\\ 0& 0& \mathrm{<figure-callout\; id="3"\; label="m"\; filenames="DEST\_PATH\_HDA00003593257800031.png,DEST\_PATH\_HDA00003593257800041.png"\; state="\{\{state\}\}">m</figure-callout>}3\end{array}\right),$ Y is the amplitude ratio of structure, $Y=\left(\begin{array}{c}{Y}_{11}\\ Y_{21}\\ Y_{31}\end{array}\right).$

, for the test natural mode of vibration of the fine motion after normalized and dimensional Finite Element modal distribution, by following formula one, calculate the damage stiffness K _obv, by formula two, calculate and do not damage stiffness K _cal, the definition loss of rigidity is

Be deployed in the distribution plan of structural plan.

$\left[K_{\mathrm{obv}}\right]={\left[{\mathrm{\&phi;}}_{\mathrm{obv}}\right]}^{-T}\mathrm{diag}[{\mathrm{\&omega;}}_1^2,{\mathrm{\&omega;}}_2^2,\&CenterDot;\&CenterDot;\&CenterDot;,{\mathrm{\&omega;}}_n^2]{\left[{\mathrm{\&phi;}}_{\mathrm{obv}}\right]}^{-1}$ Formula one

$\left[K_{\mathrm{cal}}\right]={\left[{\mathrm{\&phi;}}_{\mathrm{cal}}\right]}^{-T}\mathrm{diag}[{\mathrm{\&omega;}}_1^2,{\mathrm{\&omega;}}_2^2,\&CenterDot;\&CenterDot;\&CenterDot;,{\mathrm{\&omega;}}_n^2]{\left[{\mathrm{\&phi;}}_{\mathrm{cal}}\right]}^{-1}$ Formula two

Wherein, ω _iI rank eigenwerts, i=1,2 ..., n, [φ _obv] be ω _iBy the damaged structure proper vector that test obtains, [φ _cal] be ω _iBy the not damaged structure proper vector that calculates.

Data visualization is processed and mainly to be generated and to have shown structure height-amplitude curve, structure height-amplitude ratio curve, construction damage positioning sectional view and the quantitative sectional view of structural damage.

Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned particular implementation, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present utility model.

Claims (4)

1. the fine motion test macro of a civil engineering work panel structure damage check, it is characterized in that, comprise wave detector, registering instrument, controller, display device, wherein, described wave detector and registering instrument are connected to described controller, and described controller is connected to described display device, and described wave detector is moving-coil speed-type elastic wave exploration wave detector, described wave detector comprises simple component wave detector and/or three-component seismometer, and described registering instrument is elastic wave exploration digital seismograph.

2. the fine motion test macro of civil engineering work panel structure damage check according to claim 1, it is characterized in that, also comprise the metope web member, wherein, described metope web member comprises wave detector link and metope link, and described wave detector is connected in the wave detector link of described metope web member.

3. the fine motion test macro of civil engineering work panel structure damage check according to claim 2, it is characterized in that, also comprise the test wall, wherein, described test wall is the brick wall body structure, described wave detector is installed on described test wall by described metope web member, in differing heights and the varying level position on described test wall surface, is provided with a plurality of described wave detectors.

4. the fine motion test macro of civil engineering work panel structure damage check according to claim 3, is characterized in that, the thickness of described test wall is 0.75m.

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