CN104820019A - Method for measuring mechanical properties of concrete beams and boards by utilizing Lamb wave sensor - Google Patents
Method for measuring mechanical properties of concrete beams and boards by utilizing Lamb wave sensor Download PDFInfo
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- CN104820019A CN104820019A CN201510240920.5A CN201510240920A CN104820019A CN 104820019 A CN104820019 A CN 104820019A CN 201510240920 A CN201510240920 A CN 201510240920A CN 104820019 A CN104820019 A CN 104820019A
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Abstract
The invention discloses a method for measuring mechanical properties of concrete beams and boards by utilizing a Lamb wave sensor. The method comprises the following steps: arranging corresponding to-be-measured points on the surfaces of concrete beams and boards, respectively mounting an excitation end of the Lamb wave sensor and a receiving device, setting the number of the to-be-measured points according to needs, requiring that the diameter of coarse aggregate of all the concrete beams and boards is smaller than the wavelength, measuring the wave velocity of Lamb waves at the to-be-measured points, and repeatedly measuring the Lamb wave velocity obtained at each to-be-measured point, and acquiring the average wave velocity; and providing a dispersion relation of the Lamb waves obtained by theoretical calculation, selecting the corresponding mode, and presuming the mechanical properties of concrete beams and boards. According to the method disclosed by the invention, the mechanical properties of concrete beams and boards are obtained in a non-invasive mode, the defects of the previous longitudinal wave detection and surface acoustic wave detection are overcome, the application range of the Lamb wave sensor is greatly widened, and the mechanical properties of concrete beams and boards are effectively measured.
Description
Technical field
The present invention relates to concrete field, specifically a kind of method utilizing Lamb wave sensor to measure concrete beam plate mechanical property.
Background technology
The mechanics properties testing of new-old concrete structure mainly contains damage testing and ultrasound examination etc.Ultrasound examination has non-destructive, frequency stabilization, measuring accuracy is high, measurement is rapid and advantages of simple structure and simple, has a wide range of applications sight in building structure inspection field.Conventional hyperacoustic wave mode has compressional wave and surface acoustic wave at present.But compressional wave often roundtrip occurs in concrete component and due to impacts such as the own glutinousnesies of concrete, detection accuracy is not high, in practical operation, therefore still need to carry out concrete sampling detect.Simultaneously because surface acoustic wave mainly propagates at concrete surface, its Propagation of Energy cannot go deep into the inside of xoncrete structure, and therefore investigation depth is also very limited.Lamb wave, as Lamb wave distinctive in elastic plate, has very long propagation distance, and the Lamb wave simultaneously excited exists multiple mode of oscillation and can select for measuring.And theoretical research shows that defect in concrete is little to Lamb wave propagation effect.
Summary of the invention
The Lamb wave sensor that utilizes that the object of the present invention is to provide a kind of detection accuracy, the degree of depth high measures the method for concrete beam plate mechanical property, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A kind of method utilizing Lamb wave sensor to measure concrete beam plate mechanical property, corresponding tested point is arranged on concrete beam plate surface, that installs Lamb wave sensor respectively excites end and receiving trap, the quantity of tested point is arranged as required, and require that the diameter of the coarse aggregate of all concrete beam plates is less than wavelength, the wavelength of Lamb wave is made to meet following formula: velocity of wave=frequency × wavelength, measure the velocity of wave of Lamb wave at tested point place, the Lamb wave velocity of wave that each tested point of duplicate measurements obtains also gets its average velocity of wave v; Concrete density ρ is obtained by inquiry commerical ready-mixed concrete density meter, utilizes
equation calculates the elastic constant c of the Lamb wave direction of propagation
kk, the dispersion relation of recycling Lamb wave, selects corresponding mode and estimates the mechanical property of concrete beam plate.
As the further scheme of the present invention: described tested point is chosen arbitrarily on concrete beam plate surface.
As the further scheme of the present invention: described Lamb wave velocity of wave is directly read by the end that excites of Lamb wave sensor.
Compared with prior art, the invention has the beneficial effects as follows: the present invention obtains the mechaanical property of materials of concrete beam plate by non-damaging mode, before overcoming, compressional wave detects all drawbacks of harmony rayleigh waves inspection, has greatly promoted the range of application of Lamb wave sensor.The present invention is the extension of existing Lamb wave sensor technology, checkout equipment manufacture and processing does not exist hell and high water, the usual way completely according to Lamb wave sensor in test and data analysis.Under known concrete beam plate depth information, by exciting the Lamb wave of certain frequency, the velocity of wave of Lamb wave will be obtained by Lamb wave sensor, by corresponding Dispersion Analysis, the material mechanical performance of unique concrete beam plate can be estimated.
Accompanying drawing explanation
Fig. 1 is concrete beam plate Lamb wave test schematic diagram.
Embodiment
Below in conjunction with the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
Refer to Fig. 1, in the embodiment of the present invention, a kind of method utilizing Lamb wave sensor to measure concrete beam plate mechanical property, different measuring points is arranged up and down at concrete beam slab, the end that excites of Lamb wave sensor is arranged in its upper and lower surface, the end that excites of Lamb wave sensor will send the Lamb wave of certain frequency, Lamb wave obtains signal by the receiving trap of Lamb wave sensor after concrete beam plate internal communication, here Lamb wave velocity of wave can be recorded by the end that excites of Lamb wave sensor, can take multiple measurements at different tested points, get its mean value repeatedly, obtain its average velocity of wave v.Concrete density ρ can be obtained by inquiry commerical ready-mixed concrete density meter, then utilizes
the elastic constant c of the equation estimation Lamb wave direction of propagation
kk.The dispersion relation of Lamb wave is finally utilized accurately to estimate the dynamic modulus of elasticity of concrete beam plate.To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (3)
1. the method utilizing Lamb wave sensor to measure concrete beam plate mechanical property, it is characterized in that, corresponding tested point is arranged on concrete beam plate surface, that installs Lamb wave sensor respectively excites end and receiving trap, the quantity of tested point is arranged as required, and require that the diameter of the coarse aggregate of all concrete beam plates is less than wavelength, the wavelength of Lamb wave is made to meet following formula: velocity of wave=frequency × wavelength, measure the velocity of wave of Lamb wave at tested point place, the Lamb wave velocity of wave that each tested point of duplicate measurements obtains also gets its average velocity of wave v; Concrete density ρ is obtained by inquiry commerical ready-mixed concrete density meter, utilizes
equation calculates the elastic constant c of the Lamb wave direction of propagation
kk, the dispersion relation of recycling Lamb wave, selects corresponding mode and estimates the mechanical property of concrete beam plate.
2. the method utilizing Lamb wave sensor to measure concrete beam plate mechanical property according to claim 1, it is characterized in that, described tested point is chosen arbitrarily on concrete beam plate surface.
3. the method utilizing Lamb wave sensor to measure concrete beam plate mechanical property according to claim 1, is characterized in that, described Lamb wave velocity of wave is directly read by the end that excites of Lamb wave sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510240920.5A CN104820019A (en) | 2015-05-12 | 2015-05-12 | Method for measuring mechanical properties of concrete beams and boards by utilizing Lamb wave sensor |
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| CN201510240920.5A CN104820019A (en) | 2015-05-12 | 2015-05-12 | Method for measuring mechanical properties of concrete beams and boards by utilizing Lamb wave sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525577A (en) * | 2017-08-21 | 2017-12-29 | 兰州交通大学 | Attenuation of P-wave measurement apparatus and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359977A (en) * | 2014-10-22 | 2015-02-18 | 北京理工大学 | Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate |
| CN104406901A (en) * | 2014-11-07 | 2015-03-11 | 北京奥科瑞检测技术开发有限公司 | Concrete internal steel bar corrosion monitoring sensor based on Lamb wave principle |
-
2015
- 2015-05-12 CN CN201510240920.5A patent/CN104820019A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359977A (en) * | 2014-10-22 | 2015-02-18 | 北京理工大学 | Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate |
| CN104406901A (en) * | 2014-11-07 | 2015-03-11 | 北京奥科瑞检测技术开发有限公司 | Concrete internal steel bar corrosion monitoring sensor based on Lamb wave principle |
Non-Patent Citations (3)
| Title |
|---|
| 孙明清 等: "混凝土中的Lamb波传播", 《武汉理工大学学报》 * |
| 杜庆华 等: "《工程力学手册》", 31 October 1994, 高等教育出版社 * |
| 林玮 等: "兰姆波各模式声速与板材疲劳关系研究", 《声学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525577A (en) * | 2017-08-21 | 2017-12-29 | 兰州交通大学 | Attenuation of P-wave measurement apparatus and method |
| CN107525577B (en) * | 2017-08-21 | 2023-04-07 | 兰州交通大学 | Longitudinal wave attenuation measuring device and method |
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Application publication date: 20150805 |