CN205067310U - Steel bridge face and bed boundary shear test device of mating formation - Google Patents
Steel bridge face and bed boundary shear test device of mating formation Download PDFInfo
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- CN205067310U CN205067310U CN201520741018.7U CN201520741018U CN205067310U CN 205067310 U CN205067310 U CN 205067310U CN 201520741018 U CN201520741018 U CN 201520741018U CN 205067310 U CN205067310 U CN 205067310U
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Abstract
The utility model discloses a steel bridge face and bed boundary shear test device of mating formation relates to highway steel structure bridge bridge deck pavement technical field. Including material test machine and control cabinet, the setting of environment case is inclined at the material test built -in, environment incasement side sets up load bar, three branch loading moulds, supporting platform, and the test piece is placed between three branch loading moulds and supporting platform under the operating condition. The utility model discloses can compatible multiple test conditions to this steel bridge face and bed boundary shear test device of mating formation simple structure, testing method easily operates, can accurate record the shearing strain under the different shear stress circumstances, provides the basis for studying the non -linear shearing characteristic that bonds the state of sliding in interface.
Description
Technical field
The utility model relates to highway steel structural bridge technical field of bridge deck pavement, particularly relates to a kind of Steel Bridge Deck and pave-load layer interface shearing test unit.
Background technology
Along with the fast development of China's economy, highway bridge construction cause welcomes new development peak.The construction of large-span steel box-beam structure bridge gets more and more.Paving steel bridge deck is as bridge structure important component part, under the combined factors such as vehicular load, variation of ambient temperature, Steel Bridge Deck and pave-load layer interfacial failure are one of Major Diseases of firm deck paving, are embodied in and push permanent strain and the disease such as delamination, crack.The Mechanics Cause of paving steel bridge deck damage layer is mainly: one, the existence of deck profile grade, causes the shear stress that interface layer is horizontal and vertical; Two, the shear stress of different materials thermal expansivity generation different from Thermal Contraction Coefficient between pave-load layer; Three, the longitudinal shearing stress produced at interface when vehicle acceleration or brake.For this reason, the cutting performance of Steel Bridge Deck Pavement is the important mechanical index of bridge deck pavement structure, needs to test accurately.
Composite structure contact bed shear behavior is evaluated, mainly adopts mechanical analysis abroad, and domestic main employing experimental study.In conjunction with the shear test research of domestic and international contact bed for many years, shear test is mainly divided into direct shear and tiltedly cuts.
A kind of fixture for testing pavement interlayer shear fatigue test piece and method is disclosed in prior art, only considered the horizontal friction force of vehicle road pavement, have ignored the pressure at right angle of vehicle, and these two kinds of power can produce shear stress, obviously not meet pave-load layer virtual condition; Oblique scissor test is simple to operate, but shortcoming is test specimen there will be stress when contacting with die trial and concentrate, and has a certain impact to test.Therefore, current existing test unit can not the shear property of Measurement accuracy Steel Bridge Deck Pavement, can there is experiment abberation.
Utility model content
The utility model provides a kind of Steel Bridge Deck and pave-load layer interface shearing test unit, can compatible multiple test condition, and this Steel Bridge Deck and pave-load layer interface shearing test unit structure simple, test method is easy to operate, accurately can record the shear strain in different shear stress situation, for the shear property of the non-linear bond-slip state in research interface provides foundation.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of Steel Bridge Deck and pave-load layer interface shearing test unit, comprise Material Testing Machine, the control desk be connected with Material Testing Machine; Environmental cabinet is arranged on inside Material Testing Machine; Environmental cabinet inside upper part arranges load bar, Material Testing Machine top is run through in load bar upper end, load bar lower end connects three branches and loads mould, and it is support platform that three branches load immediately below mould, and under duty, test specimen is placed between three branches loading moulds and support platform; Test specimen is divided into steel plate layer, tack coat, pave-load layer from top to bottom, and the layer that comes to nothing is arranged on the space accounting for height 1/3rd in the middle of tack coat, and foil gauge is attached to the test specimen side scribbling epoxide resin material.
A kind of Steel Bridge Deck provided in technical solutions of the utility model and pave-load layer interface shearing test unit, can compatible multiple test condition, and this Steel Bridge Deck and pave-load layer interface shearing test unit structure simple, test method is easy to operate, accurately can record the shear strain in different shear stress situation, for the shear property of the non-linear bond-slip state in research interface provides foundation.Compared to prior art, the beneficial effects of the utility model are:
1, laminated beam model is adopted, realistic deck installation structure, by force rate direct shear test and compression-shear test closer to vehicle running speed transport condition.
2, because steel plate is different with the modulus of asphalt pavement material, larger shear stress and detrusion is produced in interface, simultaneously in the line strain of asphalt mixture surfacing least significant end and the line strain of steel plate top not etc., namely interface line strain is undergone mutation, utilize the relation of line strain and shearing strain, the measurement that interface shearing strains is converted into the measurement to line strain.
3, according to road speed, design load and climatic environment, can adjust load, temperature and loading speed.
4, test apparatus structure is simple, easy to operate, simulate condition of different temperatures in environmental cabinet under, the line strain of accurate tested steel deck paving bed interface, then shear stress and the shear strain relation of contact bed is derived, measure interface shearing-resistance performance, make the shear property at shear test result accurate response interface, improve the deficiency of existing test unit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment of the present utility model, the utility model is described in further detail.
Fig. 1 is the utility model test unit structural representation;
Fig. 2 is test specimen structural representation.
In figure, 1. Material Testing Machine, 2. support platform, 3. environmental cabinet, 4. steel plate layer, 5. come to nothing layer, 6. tack coat, 7. pave-load layer, 8. foil gauge, and 9. three branches load mould, 10. load bar, 11. control desks.
Embodiment
Clearly understand to make the purpose of this utility model, technical scheme and advantage, below in conjunction with drawings and Examples, the utility model is further elaborated, be to be understood that, specific embodiment described herein only in order to explain the utility model, and is not used in restriction the utility model.
The utility model provides a kind of Steel Bridge Deck and pave-load layer interface shearing test method, comprises
Step one, makes test specimen:
1) shaped steel plate: steel plate is processed into laminated beam test specimen required size size on lathe;
2) surface treatment: according to the degree of roughness required steel plate, uses sand-blasting machine polishing steel plate, for the polishing of steel plate corner less than part, carry out manual polishing with hand grinding tool;
3) lay tack coat: the tack coat of test specimen adopts different forms of construction work according to different asphalts, in the middle of test specimen, 1/3rd distances do not lay tack coat, form come to nothing layer and simple bending section;
4) asphalt making: after tack coat completes, waits for that it has solidified and gets final product making asphalt, form pave-load layer;
5) shaping compound girder test specimen: adopt the shaping board-like test specimen of the rolling method of forming, leave standstill after its cooling, then the demoulding becomes laminated beam test specimen along bottom steel plate profile cut;
6) foil gauge is pasted: before pasting foil gauge, for the space and groove sealing cut surface need brush one deck epoxy resin or other congeniality materials in laminated beam test specimen side, foil gauge should cohere closely with laminated beam side, not bubbles;
Step 2, insulation: the test specimen made, three branches loading moulds, support platform are placed in environmental cabinet, temperature retention time more than 4 hours, and concrete test temperature sets according to testing requirements, and temperature range is-10 DEG C ~ 70 DEG C;
Step 3, shear test: first three branches are loaded mold interval and adjust to apart from position, place, test specimen two ends 1/3rd, by start-up loading bar, make three branches load mould to move downward, the speed that three branches load mould decline is: 1.5 ~ 10mm/min, and the line strain recorded by foil gauge on test specimen, obtains shear stress according to actual loaded value, then derive shear stress and the shear strain relation of contact bed, measure interface shearing-resistance performance.
Further, the shear test of described step 3, by actual loaded value being conversed corresponding load, by the line strain under the corresponding load that records, and then the average shear strain of contact bed is converted into by formula (1), by the shear stress of direct setting-out line strain according to corresponding load under formula (2) calculating correspondence position, then derive shear stress and the shear strain relation of contact bed;
γ=(Δ ε dx)/(dy) formula (1)
In formula: dx is the differential of the foil gauge centre of form to horizontal ordinate, dy be the spacing of foil gauge and steel bridge deck top foil gauge bottom asphalt mixture paving course to the differential of ordinate, γ be contact bed produce average shear strain, Δ ε is that the line strain of contact bed is poor;
In formula: q is the evenly load that laminated beam loads; h
2for interlayer materials thickness; I is laminated beam moment of inertia; A is the distance of laminated beam neutral axis distance shear interface, τ
xyfor contact bed shear stress, σ
xfor the normal stress of laminated beam distributes.
A kind of Steel Bridge Deck as shown in Figure 1 and pave-load layer interface shearing test unit structural representation, the utility model also provides a kind of Steel Bridge Deck and pave-load layer interface shearing test unit, comprises Material Testing Machine 1, the control desk 11 be connected with Material Testing Machine 1; Environmental cabinet 3 is arranged on inside Material Testing Machine 1; Environmental cabinet 3 inside upper part arranges load bar 10, Material Testing Machine 1 top is run through in load bar 10 upper end, load bar 10 lower end connects three branches and loads mould 9, it is support platform 2 that three branches load immediately below mould 9, and under duty, test specimen is placed between three branches loading moulds 9 and support platform 2.
Be illustrated in figure 2 test specimen structural representation, test specimen is divided into steel plate layer 4, tack coat 6, pave-load layer 7 from top to bottom, and the layer 5 that comes to nothing is arranged on the space accounting for height 1/3rd in the middle of tack coat 6, and foil gauge 8 is attached to the test specimen side scribbling epoxide resin material.
In process of the test, test specimen is arranged in support platform, load bar loads mould distance according to length adjustment three branch of test specimen to be tested, three branches loading moulds are made to divide the length of test specimen to be tested equally, controlled by control desk by load test system and strain measurement system, complete corresponding test.
Test belongs to full scale test, and namely with actual paving structure, material is identical, and loading condition is complete simulation also, tiltedly cuts with existing, and constant voltage staight scissors are compared has advance.
Embodiment
The method that Steel Bridge Deck and pave-load layer interface shearing are tested, comprises the following steps:
1. the preparation of test specimen: shaped steel plate, steel plate thick for 16mm is processed into the rectangular steel plates of 300mm × 50mm by lathe.Surface of steel plate process, with sand-blasting machine by polishing steel plate to satisfactory degree of roughness, corner sand-blasting machine process less than part, carry out manual polishing with hand grinding tool.Lay tack coat, polishing steel plate is rear wiped clean well, scrapes epoxy water-proof tack coat material.The tack coat of test specimen is laid at twice, scrapes water-proof bond material simultaneously in second time, spreads the single Stone of paving.In the middle of test specimen, 1/3rd distances do not lay tack coat, form come to nothing layer and simple bending section.After waiting for tack coat consolidation, carry out next step test.Asphalt making, respectively making SMA-13, AC-10, epoxy asphalt mixture, pouring asphalt compound.Adopt the shaping board-like test specimen of the rolling method of forming.Leave standstill after its cooling and demolding, carry out next step test.Shaping compound girder test specimen, the board-like test specimen after the demoulding is become girder test specimen along bottom steel plate profile cut, and sample dimensions size is: 300mm × 50mm × 78mm.Paste foil gauge, for sealing hole and the groove of cut surface, should brush one deck epoxy resin or other congeniality materials at little beam sides before pasting foil gauge, foil gauge should cohere closely with laminated beam side, not bubbles.
2. be incubated: the test specimen made, three branches loading moulds, support platform are placed in environmental cabinet, are warming up to 15 DEG C, are incubated 5 hours.
3. shear strength test: three branches are loaded mold interval and adjust to apart from position, place, test specimen two ends 1/3rd, by starting elevating lever, making three branches load mould and moving downward with 5mm/min.
4. test findings process:
By the line strain under the corresponding load that records, be converted into the average shear strain of contact bed by formula (1), calculated the shearing strain of corresponding load under correspondence position by direct setting-out line strain according to formula (2).Then shear stress and the shear strain relation of contact bed is derived.Analyze shear stress and shear strain relation by mathematical software matlab, matching similarity coefficient reaches the function expression of 95%, and test findings is in table 1:
γ=(Δ ε dx)/(dy) formula (1)
In formula: dx is the differential of the foil gauge centre of form to horizontal ordinate, dy be the spacing of foil gauge and steel bridge deck top foil gauge bottom asphalt mixture paving course to the differential of ordinate, γ be contact bed produce average shear strain, Δ ε is that the line strain of contact bed is poor;
In formula: q is the evenly load that laminated beam loads; h
2for interlayer materials thickness; I is laminated beam moment of inertia; A is the distance of laminated beam neutral axis distance shear interface, τ
xyfor contact bed shear stress, σ
xfor the normal stress of laminated beam distributes.
Table 1 test findings
The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (1)
1. Steel Bridge Deck and a pave-load layer interface shearing test unit, is characterized in that, comprises Material Testing Machine (1), the control desk (11) be connected with Material Testing Machine (1); Environmental cabinet (3) is arranged on Material Testing Machine (1) inner side; Environmental cabinet (3) inside upper part arranges load bar (10), Material Testing Machine (1) top is run through in load bar (10) upper end, load bar (10) lower end connects three branches and loads mould (9), it is support platform (2) that three branches load immediately below mould (9), and under duty, test specimen is placed between three branches loading mould (9) and support platform (2); Test specimen is divided into steel plate layer (4), tack coat (6), pave-load layer (7) from top to bottom, the layer (5) that comes to nothing is arranged on the space accounting for height 1/3rd in the middle of tack coat (6), and foil gauge (8) is attached to the test specimen side scribbling epoxide resin material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520741018.7U CN205067310U (en) | 2015-09-23 | 2015-09-23 | Steel bridge face and bed boundary shear test device of mating formation |
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| CN201520741018.7U CN205067310U (en) | 2015-09-23 | 2015-09-23 | Steel bridge face and bed boundary shear test device of mating formation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115893A (en) * | 2015-09-23 | 2015-12-02 | 长沙理工大学 | Method and device for shearing test on interface between steel bridge deck and pavement layer |
| CN109142521A (en) * | 2018-07-27 | 2019-01-04 | 南京理工大学 | Steel Bridge Deck water-proof tack coat monitoring device and method based on piezoelectric transducer |
| CN113916689A (en) * | 2021-10-27 | 2022-01-11 | 北京建筑大学 | Method for determining strength of waterproof bonding layer paved on polymer concrete steel bridge deck |
-
2015
- 2015-09-23 CN CN201520741018.7U patent/CN205067310U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115893A (en) * | 2015-09-23 | 2015-12-02 | 长沙理工大学 | Method and device for shearing test on interface between steel bridge deck and pavement layer |
| CN109142521A (en) * | 2018-07-27 | 2019-01-04 | 南京理工大学 | Steel Bridge Deck water-proof tack coat monitoring device and method based on piezoelectric transducer |
| CN113916689A (en) * | 2021-10-27 | 2022-01-11 | 北京建筑大学 | Method for determining strength of waterproof bonding layer paved on polymer concrete steel bridge deck |
| CN113916689B (en) * | 2021-10-27 | 2023-09-19 | 北京建筑大学 | Method for determining strength of waterproof bonding layer paved on polymer concrete steel bridge deck |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20170923 |
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| CF01 | Termination of patent right due to non-payment of annual fee |