CN108414357A - A kind of device and its working method for realizing steel tube confined concrete test specimen axis pressure - Google Patents
A kind of device and its working method for realizing steel tube confined concrete test specimen axis pressure Download PDFInfo
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- CN108414357A CN108414357A CN201810424938.4A CN201810424938A CN108414357A CN 108414357 A CN108414357 A CN 108414357A CN 201810424938 A CN201810424938 A CN 201810424938A CN 108414357 A CN108414357 A CN 108414357A
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- steel pipe
- loading head
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 239000004567 concrete Substances 0.000 title claims abstract description 81
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000011888 foil Substances 0.000 claims abstract description 33
- 230000001419 dependent effect Effects 0.000 claims description 9
- 208000035126 Facies Diseases 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 238000012669 compression test Methods 0.000 description 4
- 230000002459 sustained effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of devices for realizing steel tube confined concrete test specimen axis pressure, including steel pipe and the core concrete for being cast in steel duct, the groove for being not filled by core concrete is reserved at the both ends of steel pipe, it is provided with loading head in the groove at steel pipe both ends, loading head one end is inserted into groove and is contacted with core concrete end face, loading head other end setting load cap, the unidirectional foil gauge of dry plate is provided with if being circumferentially equally spaced around on the side of loading head；The invention further relates to a kind of working methods of device that realizing steel tube confined concrete test specimen axis pressure.The present invention directly can compare the numerical value that foil gauge generates by observation, it more accurately carries out judging whether concrete is in axial compressive force state, and the corresponding position of test specimen is effectively and accurately adjusted according to strain value, ensure that core concrete, in by axial compressive force state, improves the accuracy and reliability of experimental data in loading procedure.
Description
Technical field
The present invention relates to a kind of devices and its working method for realizing steel tube confined concrete test specimen axis pressure.
Technical background
Concrete filled steel tube has the characteristics that high capacity, ductility are good, anti-seismic performance is good, in field of civil engineering application
Increasingly extensively.Concrete filled steel tube stress is divided into two kinds, and one is core concretes to be pressurized, steel pipe had not only longitudinally been pressurized but also lateral
Tension, another kind are core concrete compression, steel pipe only lateral tension.Compared to the concrete filled steel tube of the first structure type, after
A form of steel tube confined concrete structure stress is more reasonable, can more play two kinds of material advantages, bearing capacity higher and by
To concern.Steel tube confinement core concrete column axial compression test is also gradually carried out in the lab, which formally loads in test specimen
Before to carry out geometry to neutralizing physics centering, existing physics centering method, be test specimen steel pipe outer surface carry out it is symmetrical
Ground pastes foil gauge, and the difference of clearance observation sustained height strain sheet data carries out judging test specimen section stress, then accordingly
The shortcomings that ground adjusts test specimen placement location, and core concrete is made to bear axial evenly load, the experiment is steel tube confinement core
Concrete axial compression test loads initial stage, and although steel pipe has bond stress with concrete interface, even if but concrete is held at this time
Very big by load, the vertical load that steel pipe is passed to by interface is small, and the transverse direction of generation and vertical deformation are small, the steel pipe of sustained height
Vertical strain sheet data is smaller, cannot determine whether that steel pipe is in axis pressure condition.And when the numerical value that vertical foil gauge is surveyed is larger
When, corresponding applied load can be very big, and whether inner concrete has crack developing, can not also observe, to test specimen
Formal be loaded with can not also judge without influence, and steel pipe differs with concrete contact interface degree of roughness, and it is same to pass to steel pipe
The vertical load of height measuring point is not of uniform size, causes steel pipe vertical deformation variant.Therefore existing steel pipe core constrains coagulation
The test specimen physics centering method of earth pillar axial compression test can not observe the stress and deformation of internal core concrete load-bearing process,
The result for adjusting centering is unreliable, gained test data result and actually has relatively large deviation, and really reflection steel pipe core is about
Stress and collapse state of the beam concrete column during axis pressure.
Invention content
In view of this, the object of the present invention is to provide a kind of device for realizing steel tube confined concrete test specimen axis pressure and
Its working method can more accurately carry out judging that whether in by axial compressive force state, it is accurate to improve experimental result for concrete
True property and reliability.
In order to solve the above-mentioned technical problem, the technical scheme is that：Including steel pipe and the core for being cast in steel duct
Heart concrete is reserved with the groove for being not filled by core concrete at the both ends of steel pipe, is provided with and adds in the groove at steel pipe both ends
Carrier head, loading head one end are inserted into groove and are contacted with core concrete end face, loading head other end setting load cap, in loading head
It is provided with the unidirectional foil gauge of dry plate if being circumferentially equally spaced around on side.
Further, the unidirectional foil gauge is attached to the position that loading head stretches out groove.
Further, loading head sectional dimension is identical as core concrete sectional dimension, foil gauge measurement direction and load
Rostral face short transverse is consistent.
Another technical solution provided by the invention is：A kind of work of device that realizing steel tube confined concrete test specimen axis pressure
Make method, includes the device of the realization steel tube confined concrete test specimen axis pressure；
（1）One end of steel pipe is clogged using the plug of certain depth, it is mixed to pour core from the other end of steel pipe to steel duct
Solidifying soil stops pouring after core concrete distance pours end certain distance, and perpendicular be erected of steel pipe is kept to be conserved；
（2）After having conserved a period of time, core concrete solidifies completely, and the plug by plug in steel pipe one end is removed, and makes steel in this way
Pipe interlude is filled by core concrete, reserved at the both ends of steel pipe it is fluted, to the core concrete test specimen two ends in steel pipe
It polishes end face；
（3）After polishing, two loading head end faces are welded with two load caps respectively, and in the side of each loading head
First-class spacer ring is attached to around several unidirectional foil gauges, foil gauge is sticked close to one end of load cap, and not by two loading heads
The one end for being welded with load cap is filled in respectively in the groove at steel pipe both ends, and the end face of loading head is made to be connect with core concrete end face
It touches；
（4）Load is applied to load cap, loading direction is perpendicular to the end face of load cap, if being attached to loading head side by observation
Whether the dependent variable that the unidirectional foil gauge of dry plate generates, judge core concrete section by axial well-distributed pressure, if to need to adjust
Steel pipe core concrete test specimen position.If the dependent variable that unidirectional foil gauge generates is unequal, and each unidirectional foil gauge generation
When the numerical value of dependent variable difference is more than certain value, illustrate that the strain that the different directions stress of loading head side generates is different, into one
Step illustrates that by axial compressive force bias is occurred for loading head, and steel pipe core concrete test specimen is by non axial pressure at this time, at this time
It should stop loading, find axial compressive force and eccentric reason occurs, if the strain numerical quantity that generates of each unidirectional foil gauge is equal or phase
The numerical value of difference is minimum, then illustrates that the strain facies that the different directions stress of loading head side generates is same, further instruction loading head
Good by axial compressive force centering, steel pipe core concrete test specimen is not necessarily to be adjusted by axial compressive force at this time.
Compared with prior art, the beneficial effects of the invention are as follows：
（1）The present invention more precisely can reliably be sentenced directly by observing the numerical value for the foil gauge being arranged symmetrically
Whether disconnected core confined concrete is in axis and presses stress, and the corresponding positions of test specimen are effectively and accurately adjusted according to strain value
It sets, it is ensured that core concrete is in the stress of axis pressure in loading procedure, improves the accuracy and reliability of experimental data；
（2）The present invention is suitable for steel pipe core confined concrete axis of a cylinder pressure and bias test, especially in short column axial compression test,
Physics centering, which adjusts result, has higher reliability；
（3）The present invention reduces the dosage of steel, and can simplify test specimen processing journey since steel tube end part is without welding short slab
Sequence advantageously reduces testing expenses.
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, specific embodiment and phase will be passed through below
Attached drawing is closed, invention is further described in detail.
Description of the drawings
Fig. 1 is the organigram of the present invention；
Fig. 2 is the steel pipe and concrete sample organigram front view of the present invention；
Fig. 3 is the organigram front view of the load maintainer of the present invention；
Fig. 4 is the organigram vertical view of the load maintainer of the present invention.
In figure：1- steel pipes；2- core concretes；3- loading heads；The unidirectional foil gauges of 4-；5- loads cap；6- grooves.
Specific implementation mode
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode elaborate.
As shown in Fig. 1 ~ 4, a kind of device for realizing steel tube confined concrete test specimen axis pressure, including including steel pipe 1 and pour
In the core concrete 2 of steel duct, the groove 6 for being not filled by core concrete 2 is reserved at the both ends of steel pipe 1, in 1 liang of steel pipe
Loading head 3 is provided in the groove 6 at end, 3 one end of loading head is inserted into groove 6 and is contacted with 2 end face of core concrete, and loading head 3 is another
One end setting load cap 5, the unidirectional foil gauge of dry plate 4 is provided with if being circumferentially equally spaced around on the side of loading head.
In the present embodiment, the unidirectional foil gauge 4 is attached to the position that loading head 3 stretches out groove 6.
In the present embodiment, 3 sectional dimension of loading head is identical as 2 sectional dimension of concrete, 4 measurement direction of foil gauge and load
First 3 profile height direction is consistent.
A kind of working method of device that realizing steel tube confined concrete test specimen axis pressure, including the realization steel tube confinement
The device of concrete sample axis pressure；
（1）One end of steel pipe 1 is clogged using the plug of certain depth, from the other end of steel pipe 1 to steel pipe 1 inside pour core
Concrete 2 stops pouring after 2 distance of core concrete pours end certain distance, and perpendicular be erected of steel pipe 1 is kept to be supported
Shield；
（2）After having conserved a period of time, core concrete 2 solidifies completely, and the plug by plug in 1 one end of steel pipe is removed, and is made in this way
1 interlude of steel pipe is filled by core concrete 2, fluted 6 is reserved at the both ends of steel pipe 1, to the core concrete 2 in steel pipe 1
It polishes test specimen two ends end face；
（3）After polishing, two 3 end faces of loading head are welded with two load caps 5 respectively, and in each loading head 3
Around several unidirectional foil gauges 4 are sticked, unidirectional foil gauge 4 is attached to close to one end of load cap 5 the first-class spacer ring in side, and by two
One end that a loading head 3 is not welded with load cap 5 is filled in respectively in the groove 6 at 1 both ends of steel pipe, and makes end face and the core of loading head 3
2 end face of heart concrete contacts；
（4）Load is applied to load cap 5, loading direction is attached to 3 side of loading head perpendicular to the end face of load cap 5, by observation
If the dependent variable that generates of the unidirectional foil gauge 4 of dry plate, judge 2 section of core concrete whether by axial well-distributed pressure, if to need
Adjust steel pipe core concrete test specimen position.If the dependent variable that unidirectional foil gauge 4 generates is unequal, and each unidirectional foil gauge
When the numerical value of the 4 dependent variable differences generated is more than certain value, illustrate the strain of different directions stress generation of 3 side of loading head not
Together, further instruction loading head 3 is occurred eccentric by axial compressive force, and steel pipe core concrete test specimen is by non axial pressure at this time
Power should stop loading at this time, find axial compressive force and eccentric reason occurs, if the strain numerical quantity that each unidirectional foil gauge 4 generates
Equal or difference numerical value is minimum, then illustrates that the strain facies that the different directions stress of 3 side of loading head generates is same, further
Bright loading head 3 is good by axial compressive force centering, and steel pipe core concrete test specimen is not necessarily to be adjusted by axial compressive force at this time.
Aforesaid operations flow and software and hardware configuration are only used as presently preferred embodiments of the present invention, are not intended to limit the present invention
The scope of the claims, it is every using equivalents made by description of the invention and accompanying drawing content, be applied directly or indirectly in phase
Technical field is closed, is included within the scope of the present invention.
Claims (4)
1. a kind of device for realizing steel tube confined concrete test specimen axis pressure, including steel pipe and the core coagulation for being cast in steel duct
Soil is reserved with the groove for being not filled by core concrete at the both ends of steel pipe, is provided with loading head in the groove at steel pipe both ends, adds
Carrier head one end is inserted into groove and is contacted with core concrete end face, loading head other end setting load cap, on the side of loading head
It is provided with the unidirectional foil gauge of dry plate if being circumferentially equally spaced around.
2. the device according to claim 1 for realizing steel tube confined concrete test specimen axis pressure, it is characterised in that：It is described unidirectional
Foil gauge is attached to the position that loading head stretches out groove.
3. the device according to claim 1 for realizing steel tube confined concrete test specimen axis pressure, it is characterised in that：Loading head is cut
Face size is identical as core concrete sectional dimension, and foil gauge measurement direction is consistent with loading head profile height direction.
4. a kind of working method of device that realizing steel tube confined concrete test specimen axis pressure, including examine as described in claim 1
Survey the device of bias-pressure phenomenon when concrete filled steel tube is pressurized, it is characterised in that：
（1）One end of steel pipe is clogged using the plug of certain depth, it is mixed to pour core from the other end of steel pipe to steel duct
Solidifying soil stops pouring after core concrete distance pours end certain distance, and perpendicular be erected of steel pipe is kept to be conserved；
（2）After having conserved a period of time, core concrete solidifies completely, and the plug by plug in steel pipe one end is removed, and makes steel in this way
Pipe interlude is filled by core concrete, reserved at the both ends of steel pipe it is fluted, to the core concrete test specimen two ends in steel pipe
It polishes end face；
（3）After polishing, two loading head end faces are welded with two load caps respectively, and in the side of each loading head
First-class spacer ring is attached to around several unidirectional foil gauges, foil gauge is sticked close to one end of load cap, and not by two loading heads
The one end for being welded with load cap is filled in respectively in the groove at steel pipe both ends, and the end face of loading head is made to be connect with core concrete end face
It touches；
（4）Load is applied to load cap, loading direction is perpendicular to the end face of load cap, if being attached to loading head side by observation
Whether the dependent variable that the unidirectional foil gauge of dry plate generates, judge core concrete section by axial well-distributed pressure, if to need to adjust
Steel pipe core concrete test specimen position；If the dependent variable that unidirectional foil gauge generates is unequal, and each unidirectional foil gauge generation
When the numerical value of dependent variable difference is more than certain value, illustrate that the strain that the different directions stress of loading head side generates is different, into one
Step illustrates that by axial compressive force bias is occurred for loading head, and steel pipe core concrete test specimen is by non axial pressure at this time, at this time
It should stop loading, find axial compressive force and eccentric reason occurs, if the strain numerical quantity that generates of each unidirectional foil gauge is equal or phase
The numerical value of difference is minimum, then illustrates that the strain facies that the different directions stress of loading head side generates is same, further instruction loading head
Good by axial compressive force centering, steel pipe core concrete test specimen is not necessarily to be adjusted by axial compressive force at this time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810424938.4A CN108414357B (en) | 2018-05-07 | 2018-05-07 | Device for realizing axial compression of steel pipe confined concrete test piece and working method thereof |
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| CN201810424938.4A CN108414357B (en) | 2018-05-07 | 2018-05-07 | Device for realizing axial compression of steel pipe confined concrete test piece and working method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283113A (en) * | 2018-10-31 | 2019-01-29 | 中国矿业大学 | A kind of the concrete impermeability test device and test method of elimination of level circumferential pressure |
| CN110067339A (en) * | 2019-05-30 | 2019-07-30 | 福州大学 | A kind of high strength steel pipe constraint ultra-high performance concrete rod structure and its construction method |
| CN110455867A (en) * | 2019-07-16 | 2019-11-15 | 黑龙江八一农垦大学 | Concrete-filled steel square tubular column core concrete confining region boundary identification device and method |
| CN111721631A (en) * | 2020-05-11 | 2020-09-29 | 莆田学院 | Device and method for testing ultimate bearing capacity of concrete filled steel tube axial compression short column |
| CN112945705A (en) * | 2021-03-18 | 2021-06-11 | 昆明理工大学 | Model experiment confining pressure loading device and construction method thereof |
| CN113607640A (en) * | 2021-07-21 | 2021-11-05 | 清华大学 | Test analysis method and device for macroscopic occlusal force of steel pipe concrete interface |
| CN113848119A (en) * | 2021-09-27 | 2021-12-28 | 长安大学 | Method and device for testing PBL (Poly-p-phenylene benzobisoxazole) connecting piece in rectangular concrete-filled steel tube structure |
| CN114674672A (en) * | 2022-03-21 | 2022-06-28 | 温州理工学院 | Method for testing compressive strength of large-area concrete slab |
| CN114894623A (en) * | 2022-05-26 | 2022-08-12 | 福州大学 | Steel pipe constrained UHPC column axial pressure bearing capacity test device and test method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283113B (en) * | 2018-10-31 | 2023-12-29 | 中国矿业大学 | Concrete impermeability test device and test method for eliminating horizontal hoop pressure |
| CN109283113A (en) * | 2018-10-31 | 2019-01-29 | 中国矿业大学 | A kind of the concrete impermeability test device and test method of elimination of level circumferential pressure |
| CN110067339A (en) * | 2019-05-30 | 2019-07-30 | 福州大学 | A kind of high strength steel pipe constraint ultra-high performance concrete rod structure and its construction method |
| CN110455867A (en) * | 2019-07-16 | 2019-11-15 | 黑龙江八一农垦大学 | Concrete-filled steel square tubular column core concrete confining region boundary identification device and method |
| CN110455867B (en) * | 2019-07-16 | 2022-02-15 | 黑龙江八一农垦大学 | Boundary recognition device and method for core concrete confinement area of square steel tube concrete column |
| CN111721631B (en) * | 2020-05-11 | 2022-04-19 | 莆田学院 | Device and method for testing ultimate bearing capacity of concrete filled steel tube axial compression short column |
| CN111721631A (en) * | 2020-05-11 | 2020-09-29 | 莆田学院 | Device and method for testing ultimate bearing capacity of concrete filled steel tube axial compression short column |
| CN112945705A (en) * | 2021-03-18 | 2021-06-11 | 昆明理工大学 | Model experiment confining pressure loading device and construction method thereof |
| CN113607640B (en) * | 2021-07-21 | 2022-06-21 | 清华大学 | Test analysis method and device for macroscopic occlusal force of steel pipe concrete interface |
| CN113607640A (en) * | 2021-07-21 | 2021-11-05 | 清华大学 | Test analysis method and device for macroscopic occlusal force of steel pipe concrete interface |
| CN113848119A (en) * | 2021-09-27 | 2021-12-28 | 长安大学 | Method and device for testing PBL (Poly-p-phenylene benzobisoxazole) connecting piece in rectangular concrete-filled steel tube structure |
| CN114674672A (en) * | 2022-03-21 | 2022-06-28 | 温州理工学院 | Method for testing compressive strength of large-area concrete slab |
| CN114894623A (en) * | 2022-05-26 | 2022-08-12 | 福州大学 | Steel pipe constrained UHPC column axial pressure bearing capacity test device and test method thereof |
| CN114894623B (en) * | 2022-05-26 | 2024-06-04 | 福州大学 | Steel pipe constraint UHPC column axial pressure bearing capacity test device and test method thereof |
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