CN104729767B - Device and method for testing distribution of shearing stress on box girder section - Google Patents
Device and method for testing distribution of shearing stress on box girder section Download PDFInfo
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- CN104729767B CN104729767B CN201510143830.4A CN201510143830A CN104729767B CN 104729767 B CN104729767 B CN 104729767B CN 201510143830 A CN201510143830 A CN 201510143830A CN 104729767 B CN104729767 B CN 104729767B
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Abstract
The invention provides a device for testing distribution of shearing stress on a box girder section. The device comprises a box girder test piece, a fixed support and loading devices. The box girder test piece is fixedly installed on the fixed support; strain gages adhere to a specific section of the box girder test piece, and wires of the strain gages are connected with a strain acquisition system and a computer; the box girder test piece is provided with a first loading beam and a second loading beam which are matched with the loading devices, and the installation position of the second loading beam is lower than that of the first loading beam. The invention further provides a concrete interior strain testing method. By means of the device and method, concrete interior strain distribution on the specific section, the upper surfaces and the lower surfaces of a web and a flange and corresponding positions can be accurately tested, and therefore the distribution condition of shearing stress on the section is obtained, and the shearing force lag phenomenon generating on the section is accurately known.
Description
Technical field
The present invention relates to the apparatus and method that shearing stress distribution is tested on a kind of box section.
Background technology
In Reinforced Concrete Box Girder used in building structure or bridge structure has significant spatial structure characteristic, stress phase
To more complicated.In conventional all kinds of computation models, it is that In Reinforced Concrete Box Girder is considered as into thin-wall member, that is, assumes in case
Shear stress on beam section is uniformly distributed along the thickness direction of each flange plate and web, and width on (long to)
Nonlinear Distribution (such as second-degree parabola etc.) is presented, especially the nonlinear Distribution due to shear stress on wide width wing edge causes section
On bending normal stresses also there is non-linear phenomena, this is referred to as shear lageffect.Many research discoveries, box beam whole cross section
On shearing stress distribution it is complex, and cause the irregular change of direct stress, be easily caused in building structure or bridge structure
Box beam casting it is uneconomical, even there is sometimes security incident.To study the true distribution situation of shear stress on box section, state
Inside and outside scholar is mostly using only measuring concrete table by the way of the top in In Reinforced Concrete Box Girder section or bottom foil gauge
The deformation in face, and do not measure the strain of inside concrete, to fully realize on box section the distribution of shear stress with
The relation of bending normal stresses has certain limitation.In addition, in conventional method of testing, not eliminating box beam deadweight to cutting yet
The impact of shearing stress distribution on face, produces interference to recognizing Shear Lag phenomenon.For this purpose, the present invention is proposed on a kind of box section
The method of testing of shearing stress distribution and its realize device.
The content of the invention
Technical problem underlying to be solved by this invention is to provide a kind of for testing shearing stress distribution survey on box section
Method for testing and its realize apparatus and method.Using the apparatus and method, can accurately test out in particular cross section in web and the wing
The upper and lower surface of edge and corresponding position inside concrete stress distribution, and then obtain the size distribution feelings of shear stress on section
Condition, so as to be conducive to correctly recognizing the shear lag phenomenon produced on section, can scientifically analyze box-beam structure and apply bearing
Dangerous work situation under work load or working load, it is to avoid security incident occur.
In order to solve above-mentioned technical problem, the invention provides the dress that shearing stress distribution is tested on a kind of box section
Put, including：Box beam test test specimen, hold-down support and charger；
The hold-down support is anchored with ground, and the box beam test test specimen is mounted on the hold-down support；It is described
Foil gauge is pasted with the particular cross section of box beam test test specimen, wire and the strain acquisition system and computer of the foil gauge connect
Connect；The box beam test test specimen is provided with the first loading beam and the second loading beam being engaged with the charger, wherein the
The installation site of two loading beams is less than first loading beam；
The charger is divided into the first charger of structure identical and the second charger, first charger
Include steel wire rope, fixed pulley, triangular space support and loading counterweight respectively with the second charger；The fixing end of the fixed pulley
It is installed on the top crossbeam of triangular space support；One end of the steel wire rope is connected with the loading counterweight, and the other end passes through institute
State fixed pulley to be connected on the loading beam.
In a preferred embodiment：First loading beam tests the side top of test specimen located at the box beam；Described
Two loading beams are located at the one side relative with first loading beam, and are less than first loading beam.
In a preferred embodiment：The hold-down support is provided with tests the installing hole that test specimen is engaged with the box beam；Institute
The one end for stating box beam test test specimen is inserted in the installing hole, and is allowed to fixed perfusion super glue in gap is installed.
In a preferred embodiment：The particular cross section refers to obligatory point, inflection point and the corresponding section of simple bending section.
In a preferred embodiment：The strain gauge adhesion is inside and outside in the particular cross section.
Present invention also offers a kind of method that shearing stress distribution is tested on box section, comprises the following steps：
1) according to test objective, box beam test test specimen is made, and foil gauge is pasted at particular cross section, the foil gauge
Wire is connected with acquisition system and computer；The box beam test test specimen is provided with the first loading beam being engaged with charger
With the second loading beam, wherein the installation site of the second loading beam be less than first loading beam；
2) box beam made in step 1 is tested into the installing hole that test specimen inserts fixing device, and strength is irrigated in gap
Glue is allowed to fixed, is turned into fixed constraint end after hardening；
3) identical first charger of package assembly and the second charger, which mainly includes：Steel wire rope, fixed pulley, three
Angle space frame and loading counterweight；The fixing end of the fixed pulley is installed on the top crossbeam of triangular space support；The steel wire
One end of rope is connected with the loading counterweight, and the other end is connected on the loading beam by the fixed pulley；
4) according to different working conditions, different load modes is selected, following three kinds of working conditions are specifically included：
If stress distribution situation of the box beam test test specimen when top applies concentration power on different cross section 1. need to be tested, only will
First charger is loaded on the first loading beam, load counterweight size by adjusting in the first charger, and regulation is applied to
The concentration power on box beam test test specimen top；
If the stress distribution situation in box beam test test specimen on simple bending section section 2. need to be tested, by the first charger and the
Two chargers are loaded with the first loading beam and the second loading beam respectively；And the first charger and the second charger plus
Carry counterweight weight identical；
If the stress distribution situation on the section of inflection point place in box beam test test specimen 3. need to be tested, by the first charger
Loaded with the first loading beam and the second loading beam with the second charger respectively, but the loading counterweight weight of the second charger is
1-3 times of counterweight weight is loaded in first charger；
5) in the case of will be various, the wire of foil gauge be connected with strain acquisition system, computer, measures box beam test in real time
Stress distribution situation in test specimen at certain section.
In a preferred embodiment：First loading beam tests the side top of test specimen located at the box beam；Described
Two loading beams are located at the one side relative with first loading beam, and are less than first loading beam.
In a preferred embodiment：The particular cross section refers to obligatory point, inflection point and the corresponding section of simple bending section.
In a preferred embodiment：The strain gauge adhesion is inside and outside in the particular cross section.
Technical scheme possesses following beneficial effect：
The apparatus and method of shearing stress distribution test on a kind of box section that the present invention is provided.Using the device and side
Method, can accurately test out upper and lower surface and the strain of corresponding position inside concrete on web and the edge of a wing in particular cross section
Distribution, and then the size distribution situation of shear stress on section is obtained, so as to be conducive to correctly recognizing the Shear Lag produced on section
Phenomenon, can scientifically analyze dangerous work situation of the box-beam structure in the case where construction loads or working load is born, it is to avoid go out afterwards
Existing security incident.
Description of the drawings
Structure charts of the Fig. 1 for the device of shearing stress distribution test on box section in the embodiment of the present invention；
Fig. 2 is the structure chart of hold-down support in the embodiment of the present invention；
Fig. 3 is strain gauge adhesion position view in the embodiment of the present invention.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
With reference to Fig. 1-3, on a kind of box section, the method for shearing stress distribution test, comprises the following steps：
1) according to test objective, box beam test test specimen 1, and the outwardly and inwardly stickup strain at particular cross section 11 are made
Piece 12, the wire of the foil gauge 12 are connected with acquisition system and computer；The box beam test test specimen 1 is provided with and loading dress
Put the first loading beam 13 and the second loading beam (not indicating on figure) being engaged：First loading beam 13 is surveyed located at the box beam
Have a try the side top of part 1, second loading beam is located at the one side relative with first loading beam, and is less than described first
Loading beam 13.
Detailed process is：According to test objective, the sectional dimension and span of box beam test test specimen 1 are designed.According to section chi
Very little situation, cuts out four block length bar shaped sheet materials of corresponding size.At the testing section for needing, by the strain positioned at cross-sectional internal
Piece 12 need to be pasted in advance.Recycle super glue that four blocks of sheet materials are combined stickup, be finally made as box beam test test specimen
1.Beam test test specimen 1 is made after finishing, then the stickup of foil gauge 12 outside at testing section is finished.58 surveys are had on section
Point, distribution are shown in Fig. 3.The test lead fixation for connecting all foil gauges 12 is connected with acquisition system and computer.
2) box beam made in step 1 is tested into the installing hole 31 that test specimen 1 inserts fixing device 3, and is irrigated in gap
Super glue is allowed to fixed, is turned into fixed constraint end after hardening.
Detailed process is：Fixing device 3 in assembling Fig. 2, and together with the anchoring of ground.As shown in Figure 2, fixing device
3 are mainly formed by four blocks of thickness identical steel plates and its connecting bolt common combination, should choose the larger steel plate of thickness, to protect
Demonstrate,prove the device there is enough rigidity and reliable fixing end is formed.First steel plate 32 and the second steel plate 33 are with bolt hole
Rectangular steel plates；3rd steel plate 34 cuts out the sectional dimension of box beam according to the outline that box beam tests test specimen；4th steel plate 35 compares
The in-profile undersized of box section.Assembling process is as follows：First by the second steel plate 33 and the 3rd steel plate 34 by two ends
Two horizontal fastening bolts 36 are reliably connected, then overall carried out by six vertical fastening bolts 36 with first steel plate 32 can by which
By connection.Subsequently, then by the 4th steel plate 35 fixation is pasted by super glue and the first steel plate 32, is had and case so as to define
The installing hole 31 that beam section size is adapted.Finally, the fixing device 3 is fixed by ground anchor bolt with ground.
3) identical first charger 21 of package assembly and the second charger 22, by taking the first charger 21 as an example, its
Mainly include：Steel wire rope 211, fixed pulley 212, triangular space support 213 and loading counterweight 214；The fixation of the fixed pulley 212
End is installed on the top crossbeam of triangular space support 213；One end of the steel wire rope 211 is connected with the loading counterweight 214, separately
One end is connected on first loading beam 13 by the fixed pulley 212.
4) according to different working conditions, different load modes is selected, following three kinds of working conditions are specifically included：
If stress distribution situation of the box beam test test specimen when top applies concentration power on different cross section 1. need to be tested, only will
First charger 21 is loaded on the first loading beam 13, load 214 size of counterweight by adjusting, adjust in the first charger 21
Section is applied to the concentration power on 1 top of box beam test test specimen；
If the stress distribution situation on simple bending section section in box beam test test specimen 2. need to be tested, by 21 He of the first charger
Second charger 22 is loaded with the first loading beam 13 and the second loading beam respectively；And the first charger 21 and the second loading
The loading counterweight weight of device 22 is identical；So that the box beam beam below the active force applied by the second charger 22
Section is simple bending section, and therefrom choosing different sections carries out stress distribution test.
If the stress distribution situation on the section of inflection point place in box beam test test specimen 3. need to be tested, by the first charger
21 and second charger load with the first loading beam 13 and the second loading beam respectively, but the loading counterweight of the second charger 22
Weight is 1-3 times of loading counterweight weight in the first charger 21；Can be in the hope of positioned at box beam test test specimen 1 by mechanical knowledge
On the certain position moment of flexure of active force bottom that applied by the second charger 22 be 0, be disposed about foil gauge in the position
The stress distribution situation in section at inflection point can be tested.
5) in the case of will be various, the wire of foil gauge 12 be connected with strain acquisition system, computer, measures box beam survey in real time
The stress distribution situation having a try in part 1 at certain section.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (9)
1. the device that shearing stress distribution is tested on a kind of box section, it is characterised in that include：Box beam test test specimen, hold-down support
And charger；
The hold-down support is anchored with ground, and the box beam test test specimen is mounted on the hold-down support；The box beam
Foil gauge is pasted with the particular cross section of test test specimen, the wire of the foil gauge is connected with strain acquisition system and computer；
The box beam test test specimen is provided with the first loading beam and the second loading beam being engaged with the charger, wherein second adds
The installation site of carrier beam is less than first loading beam；
The charger is divided into the first charger of structure identical and the second charger, first charger and
Two chargers include steel wire rope, fixed pulley, triangular space support and loading counterweight respectively；The fixing end of the fixed pulley is installed
In the top crossbeam of triangular space support；One end of the steel wire rope is connected with the loading counterweight, and the other end is by described fixed
Pulley is connected on the loading beam.
2. the device that shearing stress distribution is tested on a kind of box section according to claim 1, it is characterised in that：Described
One loading beam tests the side top of test specimen located at the box beam；Second loading beam is located at relative with first loading beam
One side, and be less than first loading beam.
3. the device that shearing stress distribution is tested on a kind of box section according to claim 1, it is characterised in that：It is described solid
Determine bearing and be provided with the installing hole being engaged with box beam test test specimen；Insert the installation in one end of the box beam test test specimen
In hole, and it is allowed to fixed perfusion super glue in gap is installed.
4. the device that shearing stress distribution is tested on a kind of box section according to claim 1, it is characterised in that：The spy
Uniform section refers to obligatory point, inflection point and the corresponding section of simple bending section.
5. the device that shearing stress distribution is tested on a kind of box section according to claim 4, it is characterised in that：It is described to answer
Become piece and be pasted on the inside and outside of the particular cross section.
6. a kind of method that shearing stress distribution is tested on box section, it is characterised in that comprise the following steps：
1) according to test objective, box beam test test specimen is made, and foil gauge, the wire of the foil gauge is pasted at particular cross section
It is connected with acquisition system and computer；Box beam test test specimen is provided with the first loading beam for being engaged with charger and the
Two loading beams, wherein the installation site of the second loading beam is less than first loading beam；
2) box beam made in step 1 is tested into the installing hole that test specimen inserts fixing device, and super glue is irrigated in gap
It is allowed to fixed, after hardening, is turned into fixed constraint end；
3) identical first charger of package assembly and the second charger, which mainly includes：Steel wire rope, fixed pulley, triangle are empty
Between support and loading counterweight；The fixing end of the fixed pulley is installed on the top crossbeam of triangular space support；The steel wire rope
One end is connected with the loading counterweight, and the other end is connected on the loading beam by the fixed pulley；
4) according to different working conditions, different load modes is selected, following three kinds of working conditions are specifically included：
If stress distribution situation of the box beam test test specimen when top applies concentration power on different cross section 1. need to be tested, only by first
Charger is loaded on the first loading beam, load counterweight size by adjusting in the first charger, and regulation is applied to box beam
The concentration power on test test specimen top；
If the stress distribution situation in box beam test test specimen on simple bending section section 2. need to be tested, the first charger and second are added
Carry to put and load with the first loading beam and the second loading beam respectively；And the loading weight of the first charger and the second charger
Code weight is identical；
If the stress distribution situation in box beam test test specimen on the section of inflection point place 3. need to be tested, by the first charger and the
Two chargers are loaded with the first loading beam and the second loading beam respectively, but the loading counterweight weight of the second charger is first
1-3 times of counterweight weight is loaded in charger；
5) in the case of will be various, the wire of foil gauge be connected with strain acquisition system, computer, measures box beam test test specimen in real time
In stress distribution situation at certain section.
7. the method that shearing stress distribution is tested on a kind of box section according to claim 6, it is characterised in that：Described
One loading beam tests the side top of test specimen located at the box beam；Second loading beam is located at relative with first loading beam
One side, and be less than first loading beam.
8. the method that shearing stress distribution is tested on a kind of box section according to claim 6, it is characterised in that：The spy
Uniform section refers to obligatory point, inflection point and the corresponding section of simple bending section.
9. the method that shearing stress distribution is tested on a kind of box section according to claim 6, it is characterised in that：It is described to answer
Become piece and be pasted on the inside and outside of the particular cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510143830.4A CN104729767B (en) | 2015-03-30 | 2015-03-30 | Device and method for testing distribution of shearing stress on box girder section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510143830.4A CN104729767B (en) | 2015-03-30 | 2015-03-30 | Device and method for testing distribution of shearing stress on box girder section |
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| Publication Number | Publication Date |
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| CN104729767A CN104729767A (en) | 2015-06-24 |
| CN104729767B true CN104729767B (en) | 2017-04-12 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105563071B (en) * | 2015-12-19 | 2019-03-29 | 太原重工股份有限公司 | The system and method for the monitoring adjustment extremely eccentric press fitting of Press Fit Device for Wheelset, Press Fit Device for Wheelset |
| CN105758559B (en) * | 2016-04-08 | 2019-06-25 | 干飞 | A kind of shear stress test device and method |
| CN109252441B (en) * | 2018-09-19 | 2020-06-16 | 重庆交通大学 | Analysis method for shear hysteresis effect of variable cross-section box beam |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000055749A (en) * | 1998-08-12 | 2000-02-25 | Nkk Corp | Web part stress measuring device for steel structure with shaped section |
| CN100453999C (en) * | 2007-07-31 | 2009-01-21 | 中铁二局股份有限公司 | 32m/900t prestressed concrete pretension box beam static loading test method |
| CN103065035A (en) * | 2012-09-29 | 2013-04-24 | 长沙理工大学 | Design method for longitudinal pre-stressing tendons of variable-cross-section pre-stressed concrete continuous bridge |
| CN103115701A (en) * | 2013-01-18 | 2013-05-22 | 上海大学 | Experimental device used for determining cold-forming type thin-wall C structural steel stress distribution and flexual center or shearing center of cold-forming type thin-wall C structural steel |
| CN103821076A (en) * | 2013-12-25 | 2014-05-28 | 广西科技大学 | Combined curved beam calculating model for corrugated steel web |
| CN204514511U (en) * | 2015-03-30 | 2015-07-29 | 华侨大学 | The device of shearing stress distribution test on a kind of box section |
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