CN206656929U - The test system of Fatigue Strength of Concrete curve under a kind of curved scissors stress - Google Patents
The test system of Fatigue Strength of Concrete curve under a kind of curved scissors stress Download PDFInfo
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- CN206656929U CN206656929U CN201720337559.2U CN201720337559U CN206656929U CN 206656929 U CN206656929 U CN 206656929U CN 201720337559 U CN201720337559 U CN 201720337559U CN 206656929 U CN206656929 U CN 206656929U
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Abstract
The utility model discloses a kind of test system of Fatigue Strength of Concrete curve under curved scissors stress, including test test specimen and fixed loading device, test test specimen includes test specimen body and strengthening steel slab, two first end faces in test specimen body length direction are provided with the breach perpendicular to first end face, first end face is divided into first paragraph and second segment by breach, and breach is provided with strengthening steel slab on bottom surface on the end face of first paragraph, first paragraph and test specimen body；Fixed loading device includes horizontal addload component and vertical charging assembly.Test system designed by the utility model can solve the problems, such as during prior art analysis of fatigue that the excessive ratio of direct stress and shear stress and actual science of bridge building difference and the position of crack initiation and shear stress maximum position are inconsistent, and its is simple in construction, it is reasonable in design, fatigue test process is simply controllable, it is scientific strong, result of the test is reliable, has important theoretical and practical significance, has a extensive future.
Description
Technical field
Concrete fatigue test technical field is the utility model is related to, more particularly under a kind of curved scissors stress
The test system of Fatigue Strength of Concrete curve.
Background technology
The determination of concrete structure fatigue resistance effect is to carry out the vital link of structural fatigue reliability consideration.It is mixed
The research of Xtah Crude Clay structure fatigue behaviour is more to be deployed from curved drawing and shearing stress angle, and domestic and foreign scholars are in the neck since many decades
Domain expands widely studied, achieves great successes, but the research range of forefathers mainly relatively simple compression, curved drawing and
Tension and compression stress fatigue test；Complicated stress has confined pressure, side pressure and Biaxial Compressive Fatigue Test Research, and for coagulation
Endurance failure diagram research based on soil shearing stress is relatively fewer.Therefore, concrete component fatigue test is carried out, it is mixed to study
The fatigue resistance effect and endurance failure diagram equation under native curved scissors state are coagulated, is to carry out prestressed concrete beam bridge curved scissors fatigue
The prerequisite of reliability consideration, there is important theory and engineering significance.
However, the research of the endurance failure diagram equation under concrete flexural scissor state at present all comes from the form of component mostly
Research, and the document that the shear fatigue strength S-N curves of concrete are studied in the form of test specimen is relatively fewer, in addition, coagulation
Native material character itself determines that the experiment acquisition methods of its shear fatigue strength S-N curve are difficult to unification.In prior art
In the experiment acquisition methods of concrete shearing fatigue strength S-N curves, the direct stress of experimental test process and the ratio of shear stress
With the difference of practical engineering application, and the test specimen position of crack initiation and shear stress maximum position under Fatigue Load
Difference, the germinating to concrete cracks under research shear fatigue load action bring dry with development and shear fatigue life-span
Disturb, the accuracy for ultimately resulting in the test result of concrete shearing fatigue strength S-N curves is greatly reduced.
With the continuous development of scientific technology with progressive and practical application to concrete shearing fatigue strength S-N curves
The requirements at the higher level of accuracy, it is badly in need of Fatigue Strength of Concrete curve under a kind of curved scissors stress rationally reliable, accuracy is high
Test system.
The content of the invention
The technical problems to be solved in the utility model is that solve Fatigue Strength of Concrete song under existing curved scissors stress
The test system of line, during actual test, the ratio and practical engineering application difference of direct stress and shear stress are excessive, crackle
The position of germinating and shear stress maximum position are inconsistent, so as to cause concrete shearing fatigue strength S-N curves test result smart
The problem of exactness is poor, actual application easily brings adverse consequences.
In order to solve the above technical problems, the utility model adopts the following technical scheme that：
The test system of Fatigue Strength of Concrete curve under a kind of curved scissors stress, including test test specimen and fixed loading
Device, the test test specimen includes test specimen body and strengthening steel slab, relative two first in the test specimen body length direction
The breach perpendicular to first end face is equipped with end face, first end face where it is divided into first paragraph and second segment by the breach,
The length of the first paragraph is more than the length of the second segment, the first paragraph and another first end face of a first end face
The second segment it is relative, the breach is provided with bottom surface on the end face of first paragraph, first paragraph and test specimen body
Strengthening steel slab；The fixed loading device includes horizontal addload component and vertical charging assembly, the horizontal addload component and institute
State two first end faces connection on test piece lengths direction, the vertical charging assembly and bottom surface on the test test specimen
Connection.
In the above-mentioned technical solutions, the length of the test specimen body, thickness and height be respectively 360mm, 100mm and
440mm, the length of the first paragraph, breach and second segment is respectively 270mm, 20mm and 150mm.
Further, in the above-mentioned technical solutions, the depth of the breach is 180mm.
Further, in the above-mentioned technical solutions, the thickness of the strengthening steel slab is 3mm.
In the above-mentioned technical solutions, the horizontal addload component includes horizontal addload fixed mount, is arranged on horizontal addload and consolidates
Determine the horizontal force loading induction pieces of frame inner opposite end and be arranged on the shear key of the other end on the inside of horizontal addload fixed mount, institute
State shear key to be rotatablely connected with horizontal addload fixed mount medial end, the horizontal force loading induction pieces and shear key difference
It is connected with the superposition section of the first paragraph of two first end faces.
Further, in the above-mentioned technical solutions, the horizontal addload fixed mount includes two high-strength bolts and two solid
Determine steel plate, two high-strength bolts are set in parallel in the both sides on the test piece lengths direction, described two fixed steel
Plate passes through the parallel both ends for being fixedly installed on two high-strength bolts of bolt.
Further, in the above-mentioned technical solutions, the horizontal force loading induction pieces include jack, the first movable steel
Plate, pressure sensor and the second movable steel plate, described jack one end are arranged on horizontal addload fixed mount medial end, the other end
It is fixedly connected with the first movable steel plate, the both ends of the first movable steel plate are movable to be located on two high-strength bolts, described
The opposite side of first movable steel plate is fixedly connected by pressure sensor with the second movable steel plate.
In the above-mentioned technical solutions, the vertical charging assembly includes the first bearing, the second bearing and vertical actuator, institute
State the first bearing and the second bearing to be connected with the top surface on the test test specimen vertical direction and bottom surface respectively, the vertical start
Device is fixedly connected with the first bearing.
Further, in the above-mentioned technical solutions, first bearing includes pedestal and ball hinged support, described pedestal one end
Face is connected with test test specimen top surface, and other end is provided with the depression of arcwall face, the depression and the ball of the ball hinged support end face
Face projection is engaged contact connection, and the other end of the ball hinged support is fixedly connected with vertical actuator.
Further, in the above-mentioned technical solutions, the vertical actuator is hydraulic servo actuator.
The advantages of the utility model：
(1) the utility model by the breach to test specimen body close to the end face of first paragraph, first paragraph and test specimen body
Upper bottom surface sets strengthening steel slab, carries out consolidation process to it so that test specimen body surface shape of the test specimen between two breach
Into shear surface on destroy cracking at first, while cracking is occurred without on non-shear face, make crack initiation position and shear stress most
Big position matches, and the influence to shear surface fatigue behaviour after other positions ftracture is eliminated, so as to meet test requirements document；
(2) test system of Fatigue Strength of Concrete curve passes through office under the curved scissors stress designed by the utility model
Follow-on " Z " type test specimen of portion's affixing steel plate reinforcement carries out shearing resistance fatigue strength S-N curve experiments, from sample type
To observe the failure mode of anti-shear concrete fatigue, test specimen has more uniform shearing stress distribution on shear surface, therefore can obtain
It is jointly fixed by horizontal addload component and vertical charging assembly and be further applied load to shear the shear surface based on stress, come
Germinating of concrete destruction form and crackle etc. is studied, theoretical reliable, credible result degree is high；
(3) under the curved scissors stress designed by the utility model the test system of Fatigue Strength of Concrete curve just should
Power and shear stress are applied and regulated and controled by horizontal addload component and vertical charging assembly respectively, precisely can be simulated in practical application
Direct stress and shear stress, and the loading device needed for it is simple in construction, reasonable in design, fatigue test process is simply controllable, science
Property is strong, and result of the test is reliable, has important theoretical and practical significance, has a extensive future.
Except the utility model described above solve technical problem, form technical scheme technical characteristic and
Have outside advantage caused by the technical characteristic of these technical schemes, other technical characteristics of the present utility model and these technologies are special
The advantages of sign is brought, will be described further with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 is the test of the test system of Fatigue Strength of Concrete curve under the utility model embodiment curved scissors stress
The structural representation of test specimen；
Fig. 2 is the level of the test system of Fatigue Strength of Concrete curve under the utility model embodiment curved scissors stress
The structural representation of charging assembly；
Fig. 3 is that the test system of Fatigue Strength of Concrete curve under the utility model embodiment curved scissors stress is being tested
During test test specimen loading schematic diagram；
Fig. 4 is the test specimen of the test system of Fatigue Strength of Concrete curve under the utility model embodiment curved scissors stress
The structural representation of body；
In figure：Test specimen 1 is tested, test specimen body 11, breach 111, first paragraph 112, second segment 113, strengthening steel slab 12, is fixed
Loading device 2, horizontal addload component 21, horizontal addload fixed mount 211, high-strength bolt 2111, fixation steel plate 2112, horizontal force adds
Carry induction pieces 212, jack 2121, the first movable steel plate 2122, pressure sensor 2123, the second movable steel plate 2124, shearing
Part 213, vertical charging assembly 22, the first bearing 221, pedestal 2211, ball hinged support 2212, the second bearing 222, vertical actuator
223。
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is part of the embodiment of the present utility model, rather than whole embodiments.Based on the reality in the utility model
Apply example, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, all
Belong to the scope of the utility model protection.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
In addition, in description of the present utility model, unless otherwise indicated, " multiple ", " more ", " multigroup " are meant that two
Individual or two or more, " several ", " some ", " some groups " are meant that one or more.
As Figure 1-3, Fatigue Strength of Concrete curve under the curved scissors stress that the utility model embodiment is provided
Test system, including test test specimen 1 and fixed loading device 2.
Test test specimen 1 includes test specimen body 11 and strengthening steel slab 12, as shown in figure 4, phase on the length direction of test specimen body 11
To two first end faces on be equipped with breach 111 perpendicular to first end face, first end face where it is divided into the by breach 111
Be more than the length 113 of the second segment with second segment 113, the length of first paragraph 112 for one section 112, first end face it is described
First paragraph 112 is relative with the second segment 113 of another first end face, and breach 111 is close to the end face of first paragraph 112, first
In section 112 and test specimen body 11 strengthening steel slab 12 is provided with bottom surface.
As shown in figure 4, the length L1 of test specimen body 11, thickness S and height L6 are respectively 360mm, 100mm and 440mm, the
One section 112 of length L2, the length L4 of breach 111 and second segment 113 length L3 length be respectively 270mm, 20mm and
150mm；The depth L5 of breach 111 is 180mm.
The thickness of strengthening steel slab 12 is 3mm, and length is respectively 180mm, 270mm and 360mm, width 100mm.
Fixed loading device 2 includes horizontal addload component 21 and vertical charging assembly 22, horizontal addload component 21 with it is described
The two first end faces connection tested on the length direction of test specimen 1, reaches and test test specimen 1 is fixed and applied in its longitudinal direction
The purpose of horizontal force fatigue load, vertical charging assembly 22 are connected with bottom surface on the test test specimen 1, reached to testing test specimen
1 in the vertical direction applies the purpose of vertical force fatigue load.
The test system of Fatigue Strength of Concrete curve pastes steel by local under curved scissors stress of the present utility model
Follow-on " Z " type test specimen that plate is reinforced carries out shearing resistance fatigue strength S-N curve experiments, goes out from sample type mixed from sending
The failure mode of solidifying native shearing resistance fatigue, test specimen has more uniform shearing stress distribution on shear surface, therefore can obtain to shear
Shear surface based on stress, fix and be further applied load jointly by horizontal addload component and vertical charging assembly, to study coagulation
Germinating of native damage -form and crackle etc., theoretical reliable, credible result degree is high；By the breach to test specimen body close to first
Bottom surface sets strengthening steel slab on the end face of section, first paragraph and test specimen body, carries out consolidation process to it so that test specimen is two
Cracking is destroyed at first on the shear surface that test specimen body surface between individual breach is formed, while cracking is occurred without on non-shear face,
The position of crack initiation is matched with shear stress maximum position, eliminate after other positions ftracture to shear surface fatigue behaviour
Influence, so as to meet test requirements document；In addition, the shearing face to test specimen of curved scissors stress fatigue loading device of the present utility model is straight
Row fatigue loading is tapped into, classic fatigue pilot system is avoided and indirect shearing loading is carried out on test specimen so as to influence test effect
The problem of.
As shown in Fig. 2 horizontal addload component 21 includes horizontal addload fixed mount 211, horizontal force loading induction pieces 212 and cut
Power part 213, horizontal force loading induction pieces 212 are arranged on one end of the inner side of horizontal addload fixed mount 211, and shear key 213 is arranged on
The other end of the inner side of horizontal addload fixed mount 211, horizontal force loading induction pieces 212 and shear key 213 respectively with two first ends
The superposition section connection of the first paragraph 112 in face, shear key 213 are rotatablely connected with the medial end of horizontal addload fixed mount 211.
Horizontal addload fixed mount 211 includes two high-strength bolts 2111 and two fixation steel plates 2112, and above-mentioned two high-strength
Screw rod 2111 is set in parallel in the both sides on the test length direction of test specimen 1, and above-mentioned two fixation steel plate 2112 passes through bolt
The parallel both ends for being fixedly installed on two high-strength bolts 2111.
Horizontal force loading induction pieces 212 include jack 2121, the first movable steel plate 2122, pressure sensor 2123 and the
Two movable steel plates 2124, the one end of jack 2121 are fixedly installed on the medial end of horizontal addload fixed mount 211, the other end and first
Movable steel plate 2122 is fixedly connected, and the both ends of the first movable steel plate 2122 are movable to be located on two high-strength bolts 2111, the
The opposite side of one movable steel plate 2122 is fixedly connected by pressure sensor 2123 with the second movable steel plate 2124.
Vertical charging assembly 22 includes the first bearing 221, the second bearing 222 and vertical actuator 223, the first bearing 221
It is connected respectively with the top surface on the test vertical direction of test specimen 1 and bottom surface with the second bearing 222, vertical actuator 223 and first
Seat 221 is fixedly connected.
First bearing 221 includes pedestal 2211 and ball hinged support 2212, and the end face of pedestal 2211 connects with test test specimen 1 top surface
Connect, other end is provided with the depression of arcwall face, and depression is engaged the company of contact with the spherical surface hill of the end face of ball hinged support 2212
Connect, the other end of ball hinged support 2212 is fixedly connected with vertical actuator 223；Above-mentioned vertical actuator 223 is hydraulic servo
Actuator.
In summary, under the curved scissors stress designed by the utility model Fatigue Strength of Concrete curve test system
Direct stress and shear stress is applied respectively by horizontal addload component and vertical charging assembly and regulation and control, can precisely simulate it is actual should
Direct stress and shear stress in, and the loading device needed for it is simple in construction, reasonable in design, fatigue test process simply may be used
Control, scientific strong, result of the test is reliable, has important theoretical and practical significance, has a extensive future.
Finally, preferred embodiment of the present utility model is these are only, is not intended to limit protection model of the present utility model
Enclose.All any modification, equivalent substitution and improvements within the spirit and principles of the utility model, made etc., it should be included in this
Within the protection domain of utility model.
Claims (10)
- A kind of 1. test system of Fatigue Strength of Concrete curve under curved scissors stress, it is characterised in that：Including testing test specimen With fixed loading device, the test test specimen includes test specimen body and strengthening steel slab, in the test specimen body length direction relatively Two first end faces on be equipped with breach perpendicular to first end face, first end face where it is divided into first paragraph by the breach With second segment, the length of the first paragraph is more than the length of the second segment, the first paragraph of a first end face with it is another The second segment of individual first end face is relative, and the breach is gone to the bottom on the end face of first paragraph, first paragraph and test specimen body Strengthening steel slab is provided with face；The fixed loading device includes horizontal addload component and vertical charging assembly, and the level adds Carry component to be connected with two first end faces on the test piece lengths direction, the vertical charging assembly tries with the test Bottom surface connects on part.
- 2. test system according to claim 1, it is characterised in that：Length, thickness and the height point of the test specimen body Not Wei 360mm, 100mm and 440mm, the length of the first paragraph, breach and second segment is respectively 270mm, 20mm and 150mm.
- 3. test system according to claim 2, it is characterised in that：The depth of the breach is 180mm.
- 4. the test system according to Claims 2 or 3, it is characterised in that：The thickness of the strengthening steel slab is 3mm.
- 5. test system according to claim 1, it is characterised in that：The horizontal addload component is fixed including horizontal addload Frame, the horizontal force loading for being arranged on horizontal addload fixed mount inner opposite end and are arranged in horizontal addload fixed mount induction pieces The shear key of the side other end, the shear key are rotatablely connected with horizontal addload fixed mount medial end, the horizontal force loading sense The superposition section of part and the shear key respectively with the first paragraph of two first end faces is answered to be connected.
- 6. test system according to claim 5, it is characterised in that：The horizontal addload fixed mount includes two high-strength spiral shells Bar and two fixation steel plates, two high-strength bolts are set in parallel in the both sides on the test piece lengths direction, described Two fixation steel plates pass through the parallel both ends for being fixedly installed on two high-strength bolts of bolt.
- 7. the test system according to claim 5 or 6, it is characterised in that：The horizontal force loading induction pieces include very heavy Top, the first movable steel plate, pressure sensor and the second movable steel plate, described jack one end are arranged in horizontal addload fixed mount Side end, the other end are fixedly connected with the first movable steel plate, and the both ends of the first movable steel plate are movable to be located in two height On strong screw rod, the opposite side of the first movable steel plate is fixedly connected by pressure sensor with the second movable steel plate.
- 8. test system according to claim 1, it is characterised in that：The vertical charging assembly includes the first bearing, the Two bearings and vertical actuator, first bearing and the second bearing respectively with it is described test test specimen vertical direction on top surface and Bottom surface is connected, and the vertical actuator is fixedly connected with the first bearing.
- 9. test system according to claim 8, it is characterised in that：First bearing includes pedestal and ball hinged support, The pedestal end face is connected with test test specimen top surface, and other end is provided with the depression of arcwall face, the depression and the ball pivot The spherical surface hill of seat end surface is engaged contact connection, and the other end of the ball hinged support is fixedly connected with vertical actuator.
- 10. test system according to claim 8 or claim 9, it is characterised in that：The vertical actuator is hydraulic servo start Device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720337559.2U CN206656929U (en) | 2017-03-31 | 2017-03-31 | The test system of Fatigue Strength of Concrete curve under a kind of curved scissors stress |
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| CN201720337559.2U CN206656929U (en) | 2017-03-31 | 2017-03-31 | The test system of Fatigue Strength of Concrete curve under a kind of curved scissors stress |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707541A (en) * | 2020-06-24 | 2020-09-25 | 扬州大学 | Concrete uniaxial tension holding load and testing device and using method thereof |
-
2017
- 2017-03-31 CN CN201720337559.2U patent/CN206656929U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707541A (en) * | 2020-06-24 | 2020-09-25 | 扬州大学 | Concrete uniaxial tension holding load and testing device and using method thereof |
| CN111707541B (en) * | 2020-06-24 | 2023-06-02 | 扬州大学 | Single-shaft tension loading and testing device for concrete and application method thereof |
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