CN1865907A - Method for testing damage and load characteristics of concrete fracture test - Google Patents
Method for testing damage and load characteristics of concrete fracture test Download PDFInfo
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- CN1865907A CN1865907A CN 200610019119 CN200610019119A CN1865907A CN 1865907 A CN1865907 A CN 1865907A CN 200610019119 CN200610019119 CN 200610019119 CN 200610019119 A CN200610019119 A CN 200610019119A CN 1865907 A CN1865907 A CN 1865907A
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Abstract
The disclosed begin-crack load test method for concrete crack test comprises: as the stress will re-distribute after crack, arranging resistance strain gages on preformed crack, using dynamic strainometer to detect axial load and crack edge stress; when up to allowable tensile stress, generating crack, and obtaining target the tensile stress. Wherein, the relation graph between axial load and crack edge stress can show the tensile stress varying clearly.
Description
Technical field
The present invention relates to a kind of method of testing of fracture test of concrete crack initiation load.
Background technology
The stress that adopts resistance strain gage to detect material structures such as concrete, steel construction is a kind of very ripe electric detecting technology, at present in structural stress test and sensor field widespread use.
Rise (just) in the fracture test of concrete splits the difficult usually accurately test of load, generally come value according to F-CMOD (power and crack mouth opening displacement) curve, suggestion determines that by the power value of F-CMOD curve break place correspondence (just) splits load on existing testing regulations, this plays (just) and splits load generally at the 0.6-0.9 of maximum, force doubly, a large number of experiments show that: it is very difficult accurately seeking turning point on the F-CMOD curve, this makes (just) split Load value and has introduced bigger uncertainty, thereby influences xoncrete structure fragmentation parameters K
IC QAccuracy, the crack that influences xoncrete structure is judged.
Summary of the invention
Purpose of the present invention will provide a kind of method for testing damage and load characteristics of concrete fracture test exactly, adopt this method can be easily from the data that test is gathered, directly obtain fracture test of concrete crack initiation load on the concrete stress strain stress relation figure according to the xial feed of the synchronous detection of drawing and distress in concrete mouth edge.
The object of the present invention is achieved like this:
The principle that the present invention utilizes concrete structure material fracture back stress heavily to distribute, arrange that in mouth both sides, prefabricated crack highly sensitive resistance strain gage detects the STRESS VARIATION of crack mouth, adopts the stress at dynamic resistance strain instrument synchronous detection tearing test xial feed and mouth edge, crack.Along with xial feed increases, the concrete pulling stress at mouth edge, crack constantly increases, when tension reaches concrete material allowable tensile stress moment, near the mouth of prefabricated crack, produce and destroy, the crack produces, and this moment, the tension at mouth edge, crack no longer increased, along with continuing to load, the crack further enlarges, and the tension at mouth edge, crack reduces gradually.Can clearly see the turning point that the tension at mouth edge, crack changes on the concrete stress strain stress relation figure at the xial feed of synchronous detection and distress in concrete mouth edge, the xial feed of this point correspondence is cracking load.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is a stress test arrangenent diagram of the present invention.
Fig. 2 is a resistance strain gage wiring diagram among the present invention.
Fig. 3 is xial feed of the present invention and concrete stress strain stress relation figure.
Wherein, Fig. 1 double as Figure of abstract.
Among the figure: 1, force transducer, 2, resistance strain gage.
Embodiment
Embodiment:
1, the instrument and equipment of Cai Yonging
1. strainmeter
Adopt DH5937 dynamic strain measurement instrument, its main performance is: the A/D resolution is 14bit; Sample frequency is 10Hz～20KHz; Systematic uncertainty is not more than 0.5%+3 μ ε.Or strain gauge of the same type.
2. resistor disc
The resistance strain gage gauge length is 20mm, and model is BE120-20AA.Or other short gauge length resistance strain gage.
2, testing procedure
A. at concrete fracture test specimen crack mouth paster, respectively paste a slice in the prefabricated sealing both sides of two parallel surfaces of test specimen, totally 4 resistance strain gages paste 4 temperature compensation sheets simultaneously on the concrete of same composition material;
B. test specimen is placed on the lower platen of tearing test testing machine, press fixture is installed, this process and require same DL/T5332-2005 " concrete for hydraulic structure tearing test rules ";
C., a resistance-strain type load sensor is installed between test specimen and testing machine top board;
Adopt dynamic strain indicator synchronous acquisition load sensor and resistance strain gage data, the mode of connection is: load sensor takies a passage, resistance strain gage takies two passages (two faces of test specimen respectively account for a passage), two resistance strain gage wiring with a side of test specimen are example, each side is formed full-bridge by 2 active gages and 2 compensating plates and is measured, its resistance strain gage wiring as shown in Figure 2: R among the figure
1, R
3For sticking on a pair of active gage on the test specimen, R
2, R
4For sticking on same material, placing the compensating plate under the same environment, it is all isometric to connect lead.Wherein the CD input is for bridge voltage, and AB is a measuring junction;
D. begin to load by DL/T5332-2005 " concrete for hydraulic structure tearing test rules ", synchronous acquisition load sensor and resistance strain gage data are until off-test;
E. from the strainmeter image data, extract load sensor and the omnidistance data of resistance strain gage test, load sensor records the xial feed value, resistance strain gage records the ess-strain value of concrete prefabricated sealing, the xial feed value of identical time and the ess-strain value of concrete prefabricated sealing are plotted on xial feed and the concrete stress strain stress relation figure, as shown in Figure 3.
From figure, can draw crack initiation load (Pini).
Claims (1)
1, a kind of method for testing damage and load characteristics of concrete fracture test, it is characterized in that: it may further comprise the steps
A. at concrete fracture test specimen crack mouth paster, respectively paste a slice in the prefabricated sealing both sides of two parallel surfaces of test specimen, totally 4 resistance strain gages paste 4 temperature compensation sheets simultaneously on the concrete of same composition material;
B. test specimen is placed on the lower platen of tearing test machine, press fixture is installed;
C., a resistance-strain type load sensor is installed between test specimen and testing machine top board;
D. begin to load, adopt dynamic strain indicator synchronous acquisition load sensor and resistor disc data, until off-test;
E. extracting data load sensor and the resistor disc of gathering from dynamic strain indicator tested omnidistance data, load sensor records the xial feed value, resistance strain gage records the ess-strain value of concrete prefabricated sealing, the xial feed value of identical time and the ess-strain value of concrete prefabricated sealing are depicted as xial feed and concrete stress strain stress relation figure, from figure, can draw the crack initiation load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100191199A CN100498273C (en) | 2006-05-17 | 2006-05-17 | Method for testing damage and load characteristics of concrete fracture test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100191199A CN100498273C (en) | 2006-05-17 | 2006-05-17 | Method for testing damage and load characteristics of concrete fracture test |
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| Publication Number | Publication Date |
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| CN1865907A true CN1865907A (en) | 2006-11-22 |
| CN100498273C CN100498273C (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100191199A Expired - Fee Related CN100498273C (en) | 2006-05-17 | 2006-05-17 | Method for testing damage and load characteristics of concrete fracture test |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680668A (en) * | 2012-05-11 | 2012-09-19 | 河海大学 | Testing device and measuring method for measuring early-age anti-cracking performance of concrete with different thicknesses |
| CN103558083A (en) * | 2013-11-05 | 2014-02-05 | 西南交通大学 | Metal material fracture property wedge testing method and metal material fracture property wedge testing device |
| CN103698224A (en) * | 2013-11-11 | 2014-04-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Self-weight influence-free concrete material fracture toughness testing method |
| CN103728169A (en) * | 2014-01-06 | 2014-04-16 | 宁波工程学院 | High-rigidness reinforced concrete test specimen crack width controller and crack formation method |
| CN104281748A (en) * | 2014-10-08 | 2015-01-14 | 北京交通大学 | Extended finite element based ballastless-track integral ballast bed crack generation and development analyzing method |
| CN105716953A (en) * | 2015-02-02 | 2016-06-29 | 中国石油大学(北京) | Laboratory simulation test method of circulation pressure-variable fracturing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102128742B (en) * | 2010-12-07 | 2012-10-10 | 重庆交通大学 | Testing device and method of soil body II-type fracture damage |
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2006
- 2006-05-17 CN CNB2006100191199A patent/CN100498273C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680668A (en) * | 2012-05-11 | 2012-09-19 | 河海大学 | Testing device and measuring method for measuring early-age anti-cracking performance of concrete with different thicknesses |
| CN102680668B (en) * | 2012-05-11 | 2015-08-05 | 河海大学 | A kind of proving installation and assay method measuring different-thickness concrete cracking resistance in length of time morning |
| CN103558083A (en) * | 2013-11-05 | 2014-02-05 | 西南交通大学 | Metal material fracture property wedge testing method and metal material fracture property wedge testing device |
| CN103558083B (en) * | 2013-11-05 | 2015-10-14 | 西南交通大学 | A kind of Fracture of Metal Material performance wedging method of testing and device |
| CN103698224A (en) * | 2013-11-11 | 2014-04-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Self-weight influence-free concrete material fracture toughness testing method |
| CN103698224B (en) * | 2013-11-11 | 2016-08-17 | 水利部交通运输部国家能源局南京水利科学研究院 | Fracture Toughness of Concrete Material method of testing without effect of weight |
| CN103728169A (en) * | 2014-01-06 | 2014-04-16 | 宁波工程学院 | High-rigidness reinforced concrete test specimen crack width controller and crack formation method |
| CN103728169B (en) * | 2014-01-06 | 2015-09-09 | 宁波工程学院 | Large rigidity reinforced concrete test specimen control of crack width instrument and crack formulating method thereof |
| CN104281748A (en) * | 2014-10-08 | 2015-01-14 | 北京交通大学 | Extended finite element based ballastless-track integral ballast bed crack generation and development analyzing method |
| CN104281748B (en) * | 2014-10-08 | 2017-09-29 | 北京交通大学 | The analysis method that non-fragment orbit solid concrete roabed crack based on extension finite element produces and developed |
| CN105716953A (en) * | 2015-02-02 | 2016-06-29 | 中国石油大学(北京) | Laboratory simulation test method of circulation pressure-variable fracturing |
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|---|---|
| CN100498273C (en) | 2009-06-10 |
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Owner name: GEZHOUBA GROUP TEST DETECTION CO., LTD. Free format text: FORMER OWNER: CHINA GEZHOUBA GROUP CO. Effective date: 20090612 |
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