CN207300737U - The strain full curve measuring device of concrete in uniaxial compression chord - Google Patents
The strain full curve measuring device of concrete in uniaxial compression chord Download PDFInfo
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- CN207300737U CN207300737U CN201721149117.1U CN201721149117U CN207300737U CN 207300737 U CN207300737 U CN 207300737U CN 201721149117 U CN201721149117 U CN 201721149117U CN 207300737 U CN207300737 U CN 207300737U
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Abstract
It the utility model is related to a kind of strain full curve measuring device of concrete in uniaxial compression chord.Including vertical load maintainer, stiff member, deformation measurement mechanism, vertical load maintainer includes MTS actuator, concrete reaction frame, base, universal spherical joint, pressure sensor, top plate and bottom plate, stiff member includes rigid rod, upper strata cushion block, lower floor's cushion block, disk spring, rigid rod is reducing bar, and deformation measurement mechanism includes LVDT displacement meters, top offset meter stent, bottom offset meter stent, upper bearing plate, lower bearing plate and displacement meter mandril.It is controllable that the utility model tests in test loading speed, so as to analyze the influential effect of different strain rate, strain rate control is stablized in loading procedure, basically reach and at the uniform velocity load, the energy that device is gathered using disk spring absorption loading device, deform it is small, measurement on concrete descending branch influence it is small, design rationally, measurement result it is accurate.
Description
Technical field
Concrete anti-compression detection technique field is the utility model is related to, is specifically a kind of answering for concrete in uniaxial compression chord
Become full curve measuring device.
Background technology
Concrete is non-uniform fragile material inside one kind, has compression strength height, the low characteristic of tensile strength, coagulation
The strain full curve of native uniaxial compression stress is divided into ascent stage and descending branch two parts, at present, for normal concrete in axial direction
The strain curve research of stress under load action is more, and domestic and foreign scholars establish many models, but for correlation test
Study less, it is main reason is that the strain full curve of the concrete in uniaxial compression chord carried out in general Material Testing Machine
In experiment, due to Testing machine stiffness deficiency, cause curve after stress reaches maximum crushing stress to present, and occur this
The reason for phenomenon is that concrete sample is fragile material, and crack propagation is until perforation test specimen and its of short duration, storage inside loading device
The energy abrupt release deposited, causes test specimen to destroy suddenly, and collecting device can not gather decline segment data, particularly with high strain-rate
Measurement it is more difficult, in order to obtain the strain full curve of coagulation soil compressive stress, it is necessary to which one kind can accurately control loading
Speed, while when concrete reaches capacity compression, being capable of the experiment of energy gathered of transient absorption major part loading device
Device.
Utility model content
The utility model aims to solve the problem that the above problem, so that loading speed can accurately be controlled while absorb by providing one kind
The strain full curve measuring device of the concrete in uniaxial compression chord for the energy that most of loading device gathers.
The utility model solves described problem, and the technical solution of use is：
A kind of strain full curve measuring device of concrete in uniaxial compression chord, including vertical load maintainer, stiff member,
Deformation measurement mechanism；
Vertical load maintainer includes MTS actuator, concrete reaction frame, base, universal spherical joint, pressure sensor, top plate
And bottom plate, the upper end of MTS actuator are fixed on concrete reaction frame, vertical load is applied by the form of self-reaction force, MTS makees
The lower end of dynamic device is connected with top plate, and base is arranged on concrete reaction frame, and bottom plate is arranged on base, and side is provided with bottom plate
To limited block, pressure sensor is fixed on bottom plate by lateral Displacement block, is provided with concrete sample on pressure sensor, and ten thousand
It is arranged on to flexural pivot between concrete sample and top plate；
Stiff member includes rigid rod, upper strata cushion block, lower floor's cushion block, disk spring, and rigid rod is reducing bar, and upper strata is padded
Block, lower floor's cushion block, disk spring are set with and are stuck on rigid rod, keep concentric with rigid rod, disk spring is located at upper strata cushion block
With between lower floor cushion block, the top of rigid rod is screw buckle, is fixedly mounted on by clamp nut on top plate, the lower part of rigid rod
It is integrally welded with bottom plate.
Deformation measurement mechanism includes LVDT displacement meters, top offset meter stent, bottom offset meter stent, upper bearing plate, lower pressure-bearing
Plate and displacement meter mandril, upper bearing plate and lower bearing plate are separately positioned on the top and bottom of concrete sample, top offset meter branch
Frame and bottom offset meter stent are separately fixed on bearing plate and lower bearing plate, and the bottom with universal spherical joint is reserved on upper bearing plate top
The card slot that seat coordinates, the base of universal spherical joint are fixed in card slot, are welded with round steel on lower bearing plate, round steel is passed to pressure sensing
Lower bearing plate is fixed on pressure sensor inside device, the both ends of top offset meter stent and bottom offset meter stent protrude test specimen,
End set has circular hole, and LVDT displacement meters and displacement meter mandril are fixed respectively by screw.
Using the utility model of above-mentioned technical proposal, compared with prior art, the characteristics of it is protruded, is：
1. in experiment using disk spring absorb concrete reach capacity stress when the energy that gathers of loading device, deform compared with
It is small, it is more uniformly stressed, smaller on concrete sample influence, design is reasonable, measurement result is accurate；
2. it is equipped with universal spherical joint at the top of concrete sample, it is ensured that concrete sample is in axially loaded state；
3. dynamic load actuator is used, can be to the strain curve of concrete in uniaxial compression chord under different strain rate state
Measure, and compare and analyze；
4. loading speed can be accurately controlled, so as to analyze the influential effect of different strain rate, loading procedure
Middle strain rate control is stablized, and is basically reached and is at the uniform velocity loaded.
Preferably, the further technical solution of the utility model is：
One lantern ring is set between upper strata cushion block, disk spring and rigid rod, and the lantern ring is highly less than upper strata cushion block and dish
The sum of spring heights, the lantern ring do polishing treatment, to reduce the frictional force between component, and ensure the steady of upper strata cushion block and disk spring
It is fixed.
Be provided with height adjusting pads, lower height adjusting pads between disk spring and lower floor's cushion block, upper height adjusting pads and
Lower height adjusting pads are connected by helicitic texture, mutually rotation device can be highly finely adjusted, make concrete sample be in by
The critical condition of power and non-stress, with the test height being optimal.
MTS actuator is 243.41S types, and maximum load speed is 100mm/s, can carry out concrete under differently strained speed
The measurement of compression-strain full curve.
Screw hole is both provided with upper bearing plate and lower bearing plate, top offset meter stent and bottom offset meter stent pass through respectively
Screw is fixed on bearing plate and lower bearing plate, easy to assembly.
LVDT displacement meters set two and are respectively arranged in concrete sample symmetric position, take its average value to carry out in experiment
Analysis, reduces the influence brought due to height tolerance.
Upper height adjusting pads and lower height adjusting pads it is cylindrical on be both provided with adjusting circular hole, it is convenient to rotate upper-lower height tune
Whole pad carrys out regulating device height.
Brief description of the drawings
Fig. 1 is structure diagram of the embodiment of the present invention；
Fig. 2 is main structure diagram of the embodiment of the present invention；
Fig. 3 is the structure diagram that the embodiment of the present invention locally installs concrete sample；
Fig. 4 is the main structure diagram that the embodiment of the present invention locally installs concrete sample；
Fig. 5 is the schematic cross-sectional view that the embodiment of the present invention locally installs concrete sample；
Fig. 6 is the structure diagram of stiff member of the embodiment of the present invention；
Fig. 7 is the schematic cross-sectional view of stiff member of the embodiment of the present invention；
In figure：MTS actuator 1；Concrete reaction frame 2；Base 3；Top plate 4；Bottom plate 5；Pressure sensor 6；Lateral Displacement
Block 7；Top offset meter stent 8；Bottom offset meter stent 9；LVDT displacement meters 10；Mandril 11；Universal spherical joint 12；Upper bearing plate 13；Just
Property bar 14；Clamp nut 15；Upper strata cushion block 16；Disk spring 17；The lantern ring 18；Upper height adjusting pads 19；Lower height adjusting pads 20；
Lower floor's cushion block 21；Adjust circular hole 22；Concrete sample 23；Lower bearing plate 24；Round steel 25.
Embodiment：
With reference to embodiment, the utility model is described in further detail, and purpose, which is only that, more fully understands the utility model
Content, therefore, the cited case are not intended to limit the scope of protection of the utility model.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, a kind of strain full curve of concrete in uniaxial compression chord is surveyed
Measure device, including vertical load maintainer, stiff member, deformation measurement mechanism；
Vertical load maintainer includes MTS actuator 1, concrete reaction frame 2, base 3, universal spherical joint 12, pressure sensor
6th, top plate 4 and bottom plate 5, the upper end of MTS actuator 1 are fixed on concrete reaction frame 2, are applied by the form of self-reaction force vertical
Load, the lower end of MTS actuator 1 are connected with top plate 4, and base 3 is arranged on concrete reaction frame 2, and bottom plate 5 is arranged on base 3
On, lateral Displacement block 7 is provided with bottom plate 5, pressure sensor 6 is fixed on bottom plate 5 by lateral Displacement block 7, pressure sensing
Concrete sample 23 is provided with device 6, universal spherical joint 12 is arranged between concrete sample 23 and top plate 4；
Stiff member includes rigid rod 14, upper strata cushion block 16, lower floor's cushion block 21, disk spring 17, the lantern ring 18, upper height tune
Pad 19, lower height adjusting pads 20 are saved, rigid rod 14 is reducing bar, is formed by mechanical processing, and upper and lower diameter is different, upper strata cushion block
16th, lower floor's cushion block 21, disk spring 17, the lantern ring 18, upper height adjusting pads 19, lower height adjusting pads 20 are set with and are stuck in rigid rod
On 14, keep concentric with rigid rod 14, disk spring 17 is between upper strata cushion block 16 and lower floor's cushion block 21, upper height adjusting pads
19th, lower height adjusting pads 20 are arranged between disk spring 17 and lower floor's cushion block 21, and diameter difference should not mistake about 14 for rigid rod
It is small, make card slot that local failure not occur under larger load, the top of rigid rod 14 is screw buckle, is fixed by clamp nut 15
On the top plate 4, to keep stablizing and conveniently lift, the lower part of rigid rod 14 and bottom plate 5 are integrally welded for installation.
Deformation measurement mechanism include LVDT displacement meters 10, top offset meter stent 8, bottom offset meter stent 9, upper bearing plate 13,
Lower bearing plate 24 and displacement meter mandril 11, upper bearing plate 13 and lower bearing plate 24 be separately positioned on concrete sample 23 upper end and
Lower end, top offset meter stent 8 and bottom offset meter stent 9 are separately fixed on bearing plate 13 and lower bearing plate 24, upper bearing plate
The card slot with the base engagement of universal spherical joint 12 is reserved on 13 tops, and the base of universal spherical joint 12 is fixed in card slot, lower bearing plate
Round steel 25 is welded with 24, round steel 25, which is passed to inside pressure sensor 6, is fixed on lower bearing plate 24 on pressure sensor 6, on
The both ends of displacement meter stent 8 and bottom offset meter stent 9 protrude concrete sample 23, and end set has circular hole, is distinguished by screw
LVDT displacement meters 10 and displacement meter mandril 11 are fixed.
One lantern ring 18 is set between upper strata cushion block 16, disk spring 17 and rigid rod 14, and 18 height of the lantern ring is less than upper strata
The sum of cushion block 16 and the height of disk spring 17, the lantern ring 18 does polishing treatment, to reduce the frictional force between component, and ensures that upper strata is padded
The stabilization of block 16 and disk spring 17.
The surface of upper height adjusting pads 19 and lower height adjusting pads 20 is equipped with the internal and external threads of mechanical processing and passes through screw thread
Structure is connected with each other, and device can be highly finely adjusted by mutually rotating, concrete sample 23 is in stress and non-stress
Critical condition, with the test height being optimal, for convenience of adjusting, in upper height adjusting pads 19 and lower height adjusting pads 20
It is both provided with cylindrical and adjusts circular hole 22.
By the disk spring 17 of setting absorb concrete sample 23 reach capacity compression when, energy that loading device gathers
Amount, avoids concrete sample 23 that brittle break occurs, obtains the uniaxial compression stress-strain curve of concrete sample 23.
For the MTS actuator 1 used in experiment for 244.41S types, maximum load speed is 100mm/s, can carry out different answer
The measurement of concrete in uniaxial compression chord-strain full curve under variable Rate.
MTS actuator 1 is fixed on concrete reaction frame 2, applies vertical load by the form of self-reaction force；MTS starts
Device 1 is connected with top plate 4, and concrete sample 23 is placed on pressure sensor 6, and one is set between concrete sample 23 and top plate 4
Universal spherical joint 12, to ensure that load axially transmits, pressure sensor 6 by the lateral Displacement block 7 that is arranged on bottom plate 5 into
Row is fixed, and avoids toppling in loading procedure.
The bearing capacity that MTS actuator 1 measures is stiff member and the common bearing capacity of concrete sample 23, and pressure sensing
The bearing capacity that device 6 measures is the bearing capacity of concrete sample 23, when reaching concrete limit compression, the carrying of stiff member
Power continues to increase, i.e., the bearing capacity that MTS actuator 1 measures continues to increase, but the depression of bearing force of concrete sample 23.
23 upper and lower ends of concrete sample set top offset meter stent 8, bottom offset meter stent 9, top offset meter stent respectively
8th, bottom offset meter stent 9 is separately fixed on the upper bearing plate 13 identical with 23 size of concrete sample and lower bearing plate 24, is
Reserved screw hole on ease of assembly, upper bearing plate 13 and lower bearing plate 24, using screw by top offset meter stent 8, bottom offset
Meter stent 9 is fixed on bearing plate 13 and lower bearing plate 24, and card slot, card slot size and multi-directional ball are reserved in upper 13 top of bearing plate
The base of hinge 12 is identical, and to fix universal spherical joint 12, lower bearing plate 24 is welded with round steel 25, and round steel 25 is passed to pressure sensor 6
Interior, top offset meter stent 8, the both ends of bottom offset meter stent 9 are slightly longer than the length of side of concrete sample 23, and end set circular hole, leads to
Screw is crossed position LVDT displacement meters 10 and displacement meter mandril 11 are fixed respectively.
LVDT displacement meters 10 set two altogether in experiment, are respectively arranged in 23 symmetric position of concrete sample, take it average
Value is analyzed, and reduces the influence brought due to height tolerance.
The application method that the present apparatus is tested：
MTS actuator 1 and base 3 are installed first, stiff member is assembled, is placed on base 3, three is in concentric, puts
Put pressure sensor 6 and be fixed, concrete sample 23 and universal spherical joint 12 are placed on pressure sensor 6, it is high in adjustment
Spacer 19 and lower height adjusting pads 20 are spent, make subject to top plate 4 just contacts with universal spherical joint 12, to avoid generation gap, finally
Displacement measurement mechanism is installed, LVDT displacement meters 10 and displacement meter mandril 11 are fixed on symmetric position, and tested.
The utility model in test using disk spring 17 absorb concrete reach capacity stress when loading device gather
Energy, deformation is smaller, is more uniformly stressed, measurement on concrete descending branch influence it is small, design rationally, measurement result it is accurate
Really, the top of concrete sample 23 is equipped with universal spherical joint 12, it is ensured that concrete sample 23 is in axially loaded state, using dynamic
Actuator is loaded, the strain curve of concrete in uniaxial compression chord under different strain rate state can be measured, and is carried out pair
Than analysis, loading speed can be accurately controlled, should in loading procedure so as to analyze the influential effect of different strain rate
Variability control is stablized, and is basically reached and is at the uniform velocity loaded.
The above is only the preferred feasible embodiment of the utility model, not thereby limits to the power of the utility model
Sharp scope, all equivalence changes made with the utility model specification and its accompanying drawing content, is both contained in the utility model
Within interest field.
Claims (7)
- A kind of 1. strain full curve measuring device of concrete in uniaxial compression chord, it is characterised in that：Including vertical load maintainer, Stiff member, deformation measurement mechanism；Vertical load maintainer includes MTS actuator, concrete reaction frame, base, universal spherical joint, pressure sensor, top plate and bottom Plate, the upper end of MTS actuator are fixed on concrete reaction frame, apply vertical load, MTS actuator by the form of self-reaction force Lower end be connected with top plate, base is arranged on concrete reaction frame, and bottom plate is arranged on base, and lateral limit is provided with bottom plate Position block, pressure sensor are fixed on bottom plate by lateral Displacement block, and concrete sample, multi-directional ball are provided with pressure sensor Hinge is arranged between concrete sample and top plate；Stiff member includes rigid rod, upper strata cushion block, lower floor's cushion block, disk spring, and rigid rod is reducing bar, upper strata cushion block, under Layer cushion block, disk spring are set with and are stuck on rigid rod, keep concentric with rigid rod, disk spring is located at upper strata cushion block and lower floor Between cushion block, the top of rigid rod is screw buckle, is fixedly mounted on by clamp nut on top plate, the lower part of rigid rod and bottom plate It is integrally welded；Deformation measurement mechanism include LVDT displacement meters, top offset meter stent, bottom offset meter stent, upper bearing plate, lower bearing plate and Displacement meter mandril, upper bearing plate and lower bearing plate are separately positioned on the top and bottom of concrete sample, top offset meter stent and Bottom offset meter stent is separately fixed on bearing plate and lower bearing plate, and upper bearing plate top is reserved matches somebody with somebody with the base of universal spherical joint The card slot of conjunction, the base of universal spherical joint are fixed in card slot, are welded with round steel on lower bearing plate, round steel is passed in pressure sensor Lower bearing plate is fixed on pressure sensor by portion, and the both ends of top offset meter stent and bottom offset meter stent protrude concrete examination Part, end set have circular hole, and LVDT displacement meters and displacement meter mandril are fixed respectively by screw.
- 2. the strain full curve measuring device of concrete in uniaxial compression chord according to claim 1, it is characterised in that：On Layer cushion block, set a lantern ring between disk spring and rigid rod, the lantern ring is highly less than upper strata cushion block and disk spring height With.
- 3. the strain full curve measuring device of concrete in uniaxial compression chord according to claim 1, it is characterised in that：Dish Height adjusting pads, lower height adjusting pads are provided between shape spring and lower floor's cushion block, upper height adjusting pads and lower height are adjusted Pad is connected by helicitic texture.
- 4. the strain full curve measuring device of concrete in uniaxial compression chord according to claim 1, it is characterised in that： MTS actuator is 243.41S types.
- 5. the strain full curve measuring device of concrete in uniaxial compression chord according to claim 1, it is characterised in that：On Screw hole is both provided with bearing plate and lower bearing plate, top offset meter stent and bottom offset meter stent are screwed in respectively On upper bearing plate and lower bearing plate.
- 6. the strain full curve measuring device of concrete in uniaxial compression chord according to claim 3, it is characterised in that： LVDT displacement meters set two and are respectively arranged in concrete sample symmetric position.
- 7. the strain full curve measuring device of concrete in uniaxial compression chord according to claim 3, it is characterised in that：On Height adjusting pads and lower height adjusting pads it is cylindrical on be both provided with adjusting circular hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721149117.1U CN207300737U (en) | 2017-09-08 | 2017-09-08 | The strain full curve measuring device of concrete in uniaxial compression chord |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721149117.1U CN207300737U (en) | 2017-09-08 | 2017-09-08 | The strain full curve measuring device of concrete in uniaxial compression chord |
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| CN108980575A (en) * | 2018-06-28 | 2018-12-11 | 华侨大学 | The fixed device of displacement meter and its application method in civil engineering structure experiment |
| CN109030216A (en) * | 2018-08-21 | 2018-12-18 | 辽宁省交通规划设计院有限责任公司 | Structural loads couple environmental simulation laboratory with weather |
| CN109085079A (en) * | 2018-09-25 | 2018-12-25 | 合肥工业大学 | A kind of multifunctional internal-combustion engine cylinder liner piston ring friction wear testing machine |
| CN109612840A (en) * | 2018-12-27 | 2019-04-12 | 东北大学 | For obtaining the experimental provision and method of brittle rock curve in post-peak area and retained strength |
| CN109870359A (en) * | 2019-03-15 | 2019-06-11 | 长安大学 | A kind of the complete stress-strain curve of concrete test device and working method |
| CN109932253A (en) * | 2019-03-28 | 2019-06-25 | 河海大学 | Test 4 points of curved experimental rigs for drawing concrete sample load-deformation full curve |
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| CN110376051A (en) * | 2019-07-08 | 2019-10-25 | 东南大学 | A kind of uniaxial test load sharing system on testing machine |
| CN111829764A (en) * | 2020-06-08 | 2020-10-27 | 中电建路桥集团有限公司 | Mechanical measurement device for right-angle reinforced concrete member and use method |
| CN112326941A (en) * | 2020-10-28 | 2021-02-05 | 大连交通大学 | Strain testing device based on concrete extreme environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108980575A (en) * | 2018-06-28 | 2018-12-11 | 华侨大学 | The fixed device of displacement meter and its application method in civil engineering structure experiment |
| CN108980575B (en) * | 2018-06-28 | 2023-12-29 | 华侨大学 | Displacement meter fixing device in civil engineering structure experiment and application method thereof |
| CN109030216A (en) * | 2018-08-21 | 2018-12-18 | 辽宁省交通规划设计院有限责任公司 | Structural loads couple environmental simulation laboratory with weather |
| CN109085079A (en) * | 2018-09-25 | 2018-12-25 | 合肥工业大学 | A kind of multifunctional internal-combustion engine cylinder liner piston ring friction wear testing machine |
| CN109612840B (en) * | 2018-12-27 | 2021-03-09 | 东北大学 | Experimental device and method for obtaining post-peak curve and residual strength of brittle rock |
| CN109612840A (en) * | 2018-12-27 | 2019-04-12 | 东北大学 | For obtaining the experimental provision and method of brittle rock curve in post-peak area and retained strength |
| CN109870359A (en) * | 2019-03-15 | 2019-06-11 | 长安大学 | A kind of the complete stress-strain curve of concrete test device and working method |
| CN109932253A (en) * | 2019-03-28 | 2019-06-25 | 河海大学 | Test 4 points of curved experimental rigs for drawing concrete sample load-deformation full curve |
| CN110361263A (en) * | 2019-07-08 | 2019-10-22 | 东南大学 | A kind of efficient single shaft fatigue test load sharing system |
| CN110376051A (en) * | 2019-07-08 | 2019-10-25 | 东南大学 | A kind of uniaxial test load sharing system on testing machine |
| CN111829764A (en) * | 2020-06-08 | 2020-10-27 | 中电建路桥集团有限公司 | Mechanical measurement device for right-angle reinforced concrete member and use method |
| CN112326941A (en) * | 2020-10-28 | 2021-02-05 | 大连交通大学 | Strain testing device based on concrete extreme environment |
| CN112485113A (en) * | 2020-11-17 | 2021-03-12 | 核工业西南物理研究院 | Method and device for testing material tensile property of small-size sample |
| CN112485113B (en) * | 2020-11-17 | 2023-04-21 | 核工业西南物理研究院 | Method and device for testing tensile property of material of small-size sample |
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