CN104864989B - A kind of method of testing of existing concrete structure absolute stress - Google Patents
A kind of method of testing of existing concrete structure absolute stress Download PDFInfo
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- CN104864989B CN104864989B CN201510342272.4A CN201510342272A CN104864989B CN 104864989 B CN104864989 B CN 104864989B CN 201510342272 A CN201510342272 A CN 201510342272A CN 104864989 B CN104864989 B CN 104864989B
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Abstract
The invention provides a kind of method of testing of existing concrete structure absolute stress, including the following steps carried out in order：The spread speed v of step [1] measurement concrete component ultrasonic wave in an unstressed state0；Step [2] is popped one's head in using embed-type spherical ultrasonic and ultrasonic detecting equipment obtains ultrasonic wave in concrete structure interior edge stress σ1The speed v that direction is propagatedt；Step [3] is calculated inside concrete structure in σ according to formula1The size of absolute stress σ 1 on direction.The present invention can directly measure the inside absolute stress of existing concrete structure, it is and more accurate to the theory analysis of concrete stress more in the prior art, this method not only increases the measurement accuracy of absolute stress, and measurement process is simple to operate, and measurement data is more credible.
Description
Technical field
The present invention relates to concrete stress testing field, more particularly to a kind of test of existing concrete structure absolute stress
Method.
Background technology
Absolute stress inside concrete structure is one of most important index for reflecting concrete structure force-bearing situation,
It is the leading indicator for reflecting concrete structure functional reliability.Due to many during concrete structure construction and use be present
The factor that can not be determined, such as construction error, concrete creep, loss of prestress, cause concrete stress and theory in structure
Analysis result has different, and this, which allows for theoretical calculation, can not draw the true stress of concrete structure.Concrete structure exists
Caused non-load factor causes extra internal force to be that conventional test methods can not measure during long-term use.Therefore, need
It is proposed a kind of method for more directly measuring absolute stress inside existing concrete structure.
The content of the invention
For overcome the deficiencies in the prior art, the invention provides a kind of existing unidirectional concrete stress structure absolute stress
Method of testing, it can not only directly measure absolute stress inside existing concrete structure, and simple to operate, measurement essence
Really.
The technical solution adopted for the present invention to solve the technical problems is：A kind of survey of existing concrete structure absolute stress
Method for testing, including the following steps carried out in order：
Step [1] makes a call to two holes surface of concrete structure is separated by a distance, takes out core sample, using ultrasonic probe and
Supersonic wave test instrument measures to the core sample of taking-up, obtains spread speed of the ultrasonic wave inside core sample, two pieces of core samples
Unconfined free state is in after taking-up, not by any external force, therefore stress is 0, and it is mixed to measure its internal velocity of sound
Coagulate the spread speed v of native component ultrasonic wave in an unstressed state0；
Embed-type spherical ultrasonic is popped one's head in embedment step [1] after coring in caused cavity and by cavity by step [2]
Expired with Concrete Filled, the spherical ultrasonic is popped one's head in and is connected with ultrasonic detecting equipment, obtain ultrasonic wave in concrete knot
Structure interior edge stress σ1The speed v that direction is propagatedt；
Step [3] is in σ1Under active state, another stress σ of concrete component2For 0, it is calculated according to following formula mixed
In σ inside Xtah Crude Clay structure1The size of absolute stress σ 1 on direction：
In formula, vtIt is concrete component in stress σ1、σ2The spread speed of ultrasonic wave under state；
v0For the spread speed of concrete component ultrasonic wave in an unstressed state；
K is the sonoelastic coefficient of ultrasonic wave.
The positive effect of the present invention：The present invention can directly measure the inside absolute stress of existing concrete structure, and
More accurate to the theory analysis of concrete stress more in the prior art, this method not only increases the measurement essence of absolute stress
Degree, and measurement process is simple to operate, and measurement data is more credible.
Brief description of the drawings
Fig. 1 is absolute stress test concrete structure diagrammatic cross-section of the present invention.
Embodiment
Below in conjunction with the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
Reference picture 1, a kind of method of testing of existing concrete structure absolute stress of offer of the preferred embodiment of the present invention,
1) when measuring the inside absolute stress of existing concrete structure, such as Fig. 1, by taking bridge 1 as an example, in bridge lower surface phase
(being preferably one meter) makes a call to two holes 2 at a certain distance, takes out core sample, is then popped one's head in using planar ultrasonic wave (transducer) and existing
Ultrasonic test instrument measures to the core sample of taking-up, measures spread speed of the ultrasonic wave inside core sample.Due to this two pieces
Core sample is in unconfined free state after taking-up, and not by any external force, therefore stress is 0, measures its internal velocity of sound i.e.
For v0。
2) spherical embed-type ultrasonic probe is embedded in step 1) after coring in caused cavity and fills cavity completely,
Spherical ultrasonic is popped one's head in and is connected with ultrasonic detecting equipment, ultrasonic wave can be measured in concrete structure interior edge stress σ1Direction passes
The speed v broadcastt。
Utilize formula：
In σ1Under active state, another stress σ of concrete structure2For 0, then coagulation can be calculated according to above-mentioned formula
Absolute stress σ inside soil structure in this direction1Size.
Test philosophy of the present invention is measured based on sound wave acoustic elasticity formula, can be obtained using the change of SVEL：
Wherein：vt- concrete component is in stress σ1、σ2The spread speed of ultrasonic wave under state；
v0The spread speed of-concrete component ultrasonic wave in an unstressed state；
The sonoelastic coefficient of K-ultrasonic wave.
This method of testing is i.e. theoretical using above-mentioned formula, by carrying out coring to existing concrete structure, measures unstressed
Ultrasonic velocity under state, then by the built-in spherical embed-type ultrasonic probe in concrete structure, to structure interior edge master
The velocity of sound on stress direction is measured, and the absolute stress of concrete structure is finally calculated according to formula.
Above-described is only the preferred embodiments of the present invention, should be understood that the explanation of above example is simply used
In help understand the present invention method and its core concept, the protection domain being not intended to limit the present invention, it is all the present invention
Any modification for being made within thought and principle, equivalent substitution etc., should be included in the scope of the protection.
Claims (2)
- A kind of 1. method of testing of existing concrete structure absolute stress, it is characterised in that：Including the following step carried out in order Suddenly：Step [1] makes a call to two holes surface of concrete structure is separated by a distance, takes out core sample, utilizes ultrasonic probe and ultrasound Ripple tester measures to the core sample of taking-up, obtains spread speed of the ultrasonic wave inside core sample, two pieces of core samples are after taking-up In unconfined free state, not by any external force, therefore stress is 0, and it is concrete component to measure its internal velocity of sound The spread speed v of ultrasonic wave in an unstressed state0；Step [2], which pops one's head in embed-type spherical ultrasonic, to be embedded in step [1] after coring in caused cavity and uses cavity mixed Solidifying soil filling is full, and the spherical ultrasonic is popped one's head in and is connected with ultrasonic detecting equipment, obtains ultrasonic wave in concrete structure Along stress σ1The speed v that direction is propagatedt；Step [3] is in σ1Under active state, another stress σ of concrete component2For 0, concrete is calculated according to following formula Inside configuration is in σ1The size of absolute stress σ 1 on direction：<mrow> <mfrac> <mrow> <msub> <mi>v</mi> <mi>t</mi> </msub> <mo>-</mo> <msub> <mi>v</mi> <mn>0</mn> </msub> </mrow> <msub> <mi>v</mi> <mn>0</mn> </msub> </mfrac> <mo>=</mo> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>&sigma;</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&sigma;</mi> <mn>2</mn> </msub> <mo>)</mo> </mrow> </mrow>In formula, vtIt is concrete component in stress σ1、σ2The spread speed of ultrasonic wave under state；v0For the spread speed of concrete component ultrasonic wave in an unstressed state；K is the sonoelastic coefficient of ultrasonic wave.
- A kind of 2. method of testing of existing concrete structure absolute stress according to claim 1, it is characterised in that：Step [1] the distance between holes is beaten in as one meter.
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| CN111006946B (en) * | 2019-10-21 | 2020-11-17 | 武汉大学 | Method for ultrasonic nondestructive detection of nonuniform sleeve restraining force of square steel tube concrete column |
| CN110987611B (en) * | 2019-10-21 | 2020-11-17 | 武汉大学 | Method for nondestructively measuring active and passive restraint force of FRP (fiber reinforced Plastic) restraint concrete column based on ultrasonic waves |
| CN112730614A (en) * | 2020-12-22 | 2021-04-30 | 中冶建筑研究总院有限公司 | Surface ultrasonic device and method for detecting prestress value |
| CN113405450A (en) * | 2021-06-01 | 2021-09-17 | 北京科技大学 | Rock concrete structural body stability monitoring and early warning method based on static magnetic field detection |
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| US3301038A (en) * | 1964-01-02 | 1967-01-31 | North American Aviation Inc | Thrust measurement calibrator |
| CN1013711B (en) * | 1988-12-27 | 1991-08-28 | 交通部重庆公路科学研究所 | Piezomagnetic concrete absolute stress detection device capable of directly displaying stress value |
| CN101539540B (en) * | 2009-04-09 | 2011-07-06 | 江苏省电力试验研究院有限公司 | Ultrasonic guided wave testing method of corrosion of partially implanted pole body of steel pipe pole |
| CN102865952B (en) * | 2012-09-13 | 2014-11-12 | 许锡宾 | Nondestructive testing method for working stress of concrete |
| CN102928145B (en) * | 2012-10-26 | 2014-12-10 | 交通运输部公路科学研究所 | Method for detecting absolute stress of prestressed concrete bridge |
| DE102013008777A1 (en) * | 2013-05-23 | 2014-11-27 | Frank-Michael Jäger | Method and device for mechanical stress measurement |
| CN204346637U (en) * | 2015-01-17 | 2015-05-20 | 长安大学 | A kind of steel bundle prestress test caliberating device |
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