CN203849110U - Eccentric compression column non-unloading strengthening testing device - Google Patents
Eccentric compression column non-unloading strengthening testing device Download PDFInfo
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- CN203849110U CN203849110U CN201420095005.2U CN201420095005U CN203849110U CN 203849110 U CN203849110 U CN 203849110U CN 201420095005 U CN201420095005 U CN 201420095005U CN 203849110 U CN203849110 U CN 203849110U
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Abstract
The utility model discloses an eccentric compression column non-unloading strengthening testing device which comprises a counter-force rigid frame, a movable rigid beam capable of moving up and down, a load applying device, two force sensors and a strain gage connected to the two force sensors, wherein the counter-force rigid frame is composed of two rigid frame vertical posts and a fixed beam; a testing column to be detected is mounted between the fixed beam and the movable rigid beam; the movable rigid beam is arranged between the two rigid frame vertical posts; unidirectional reamers and pressure distribution plates are arranged between the testing column and the fixed beam at the upper end of the testing column as well as between the testing column and the movable rigid beam at the lower end, and the pressure distribution plates are contacted with end faces of the ends of the testing column; the testing device further comprises tightening pieces which are arranged at the ends of the testing column in pair; each tightening piece is composed of two semicircular steel plates and a bolt. The testing device disclosed by the utility model is good in controllability, simple in structure, convenient to operate, and capable of protecting local concrete at column end from being broken before damage of an overall test piece so as to avoid test failure.
Description
Technical field
The utility model belongs to test unit, is specifically related to the non-unloading reinforcement experiment of a kind of eccentric compression post device.
Background technology
The compression member coming into operation, if desired reinforce, should first unload and just can make the effect of back-up coat be not fully exerted, but in Practical Project, be difficult to accomplish this point, can only accomplish partial relief or not unloading, be that former member has born load action before reinforcing, be called first stage load-bearing, after reinforcing, only have when external load continuation increase, be called subordinate phase load-bearing, the distortion of member also continues to increase, back-up coat just can assist former member to bear the effect of newly-increased external load, and this makes the stress and strain of former member all be ahead of back-up coat.
At present, the test that the non-unloading of compression member is reinforced is normally carried out on hydraulic pressure long column testing machine, when post voltage stabilizing " first stage load-bearing " in the situation that on testing machine to column production back-up coat, maintenance is to the corresponding length of time, then completes " subordinate phase loading " until reinforced column destroys.The drawback that this mode exists is apparent, comprise while causing taking machine because back-up coat curing period is long too many, long-time overheated large to testing machine loss, under hydropress top load, voltage regulation result is poor and cause the stress level index β distortion that " first stage load-bearing " the is corresponding (definition β=N that diminishes
0/ N, N
0for " first stage load-bearing " the actual loading value after stable, N is the limit failing load of former post), or may make the Binder Materials in back-up coat disappear completely with the just cohesive action of foundation of former post concrete in order to maintain the repeatedly ftercompction operation that stress level index β does, in addition, on long column testing machine, carry out strengthening construction operation also very inconvenient.The importance of the test that the experimental study of eccentric compressive reinforced concrete column stress performance is reinforced as the non-unloading of compression member, meets the experimental study that the non-unloading of vast scale eccentric compression post of engineering actual conditions reinforces significant.
At present, when the bias voltage test of reinforced concrete post processed or steel core concrete column, due to loading end make out-of-flatness or local load-bearing inhomogeneous, usually there is test specimen before the bearing capacity that do not reach capacity, the crushed phenomenon that causes whole test failure of the local concrete of styletable, process of the test is given up halfway, and test findings is undesirable, thus the waste of having asked while having caused scientific research fund profit.And in fact, in Architectural Structure Experimentation process, want to guarantee that test piece end is definitely smooth and load is definitely evenly very difficult, or even impossible.Therefore, seek to guarantee that styletable is not technical matters urgently to be resolved hurrily in Architectural Structure Experimentation prior to the destruction methods of integrated member.
Summary of the invention
It is poor that the purpose of this utility model overcomes the voltage regulation result existing in prior art, machine loss is large, use inconvenience and test specimen before the bearing capacity that do not reach capacity, the crushed problem that causes whole test failure of the local concrete of styletable, the non-unloading reinforcement experiment of a kind of eccentric compression post device is provided, and this device is not only simple in structure, safe and reliable, and voltage regulation result is good under top load, guarantee that the test specimen styletable loading before bearing capacity that reaches capacity does not first destroy.
By a large amount of literature reading and Field Research both at home and abroad found, because test unit and the test method problem of simulation full size reinforced column " two stage load-bearings " fail better to be solved, recent domestic is adopted in the experimental study of the whole bag of tricks reinforced steel concrete compression member, all that the load-bearing that does not meet engineering actual conditions carrying out is reinforced research, test the former post of post and in the situation that there is no carrying, complete the making of back-up coat, be then placed on pressure testing machine and carry out failure test.This engineering problem as for solid ply strain and the former post hysteresis of stress ratio, the unified reduction coefficient that adopts is paid attention to, but its actual conditions tend to because of the difference of the stress level index β under " first stage load-bearing ", the difference of the difference of post element type, reinforcing layer material kind etc. changes.Visible this reduction coefficient method, with very large rough property, has caused untrue property and the unreliability of Design of Reinforcement naturally.
For realizing the purpose of this utility model, the technical scheme of employing is as follows:
The non-unloading reinforcement experiment of eccentric compression post device, comprise counter-force rigid frame, portable rigid beam moving up and down, load applying device, two power sensors and the strainmeter being connected with two power sensors, counter-force rigid frame is comprised of two rigid frame columns and fixed cross beam, and testing column to be measured is installed between fixed cross beam and portable rigid beam, and its special character is: described portable rigid beam is arranged between two rigid frame columns; Unidirectional cutter hinge and pressure distribution plate are all set between testing column and the fixed cross beam of its upper end and between the portable rigid beam of testing column and its lower end, pressure distribution plate all with testing column styletable end contact; Described test unit also comprises the fastening piece of the paired preparation in styletable place that is arranged on testing column, and described fastening piece consists of two semicircle steel plates and bolt.
Further, described load applying device comprises two screw jacks and a fluid pressure type lifting jack, and fluid pressure type lifting jack is arranged between two screw jacks.
Further, described portable rigid beam is that steel construction box cuts section bar, and the length breadth ratio of portable rigid beam is 4, is provided with the intensity floor of putting more energy in portable rigid beam, and portable rigid beam two ends respectively arrange four steamboats; The medial surface setting of described rigid frame column can make the conduit of the free scroll-up/down of steamboat.
Further, described screw jack is that specified tonnage is 1000kN screw machine lifting jack; Described fluid pressure type lifting jack is that specified tonnage is 5000kN fluid pressure type lifting jack, and fluid pressure type lifting jack is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed.
Further, described test unit also comprises the safe steel cable for the protection of testing column.
The utility model is with respect to prior art, and tool has the following advantages and effect:
This test unit its execute lotus ability Ji Liang Measuring scope can meet the full scale test post consistent with engineering actual conditions reinforce after the test request of maximum bearing capacity.
The loading voltage regulation result of this test unit can meet during holding lotus, make newly to manufacture not directly pressurized and secure bond at former post surface back-up coat always in 0 stress state.
3. this test unit is in each moment and under each class of loading, and the energy actual load-bearing size of its member of Accurate Measurement and deformation values, meet measuring accuracy requirement.
4. this test unit meets security requirement.
5. this test unit controllability is good, simple in structure, easy and simple to handle.
6. in axial compression or bias voltage test, use this device can avoid because load plate making out-of-flatness or the inhomogeneous local concrete of styletable that causes of local load-bearing of loading end are crushed before the whole destruction of test specimen, thereby make test failure.
7. be conducive to save fund of scientific research and time.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of fastening piece in Fig. 1;
Wherein, 1, fixed cross beam; The unidirectional cutter hinge of 2-; 3, pressure distribution plate; 4, testing column; 5, fastening piece; 5-1, semicircle steel plate; 5-2, bolt; 6, portable rigid beam; 7, power sensor; 8, fluid pressure type lifting jack; 9, screw jack; 10, rigid frame column; The safe steel cable of 11-.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the non-unloading reinforcement experiment of the eccentric compression post apparatus structure that the utility model provides.For convenience of explanation, only show the part relevant to the utility model.
The non-unloading reinforcement experiment of eccentric compression post of the present utility model device, comprise: counter-force rigid frame, portable rigid beam 6 moving up and down, load applying device, two power sensors 7 and the strainmeter being connected with two power sensors, counter-force rigid frame is comprised of two rigid frame columns 10 and fixed cross beam 1, and testing column to be measured is installed between fixed cross beam 1 and portable rigid beam 6, and portable rigid beam 6 is arranged between two rigid frame columns 10; Unidirectional cutter hinge 2 and pressure distribution plate 3 are all set between the fixed cross beam 1 of testing column 4 and its upper end and between the portable rigid beam 6 of testing column 4 and its lower end, pressure distribution plate all with testing column styletable end contact; This test unit also comprises the fastening piece 5 of the paired preparation in styletable place that is arranged on testing column, and described fastening piece consists of two semicircle steel plate 5-1 and bolt 5-2.
As a prioritization scheme of the utility model embodiment, load applying device comprises two screw jacks 9 and a fluid pressure type lifting jack 8, and fluid pressure type lifting jack 8 is arranged between two screw jacks 9.
A prioritization scheme as the utility model embodiment, portable rigid beam 6 cuts section bar for steel construction box, the length breadth ratio of portable rigid beam 6 is 4, is provided with the intensity floor of putting more energy in portable rigid beam 6, and portable rigid beam 6 two ends respectively arrange four steamboats; The medial surface setting of described rigid frame column 10 can make the conduit of the free scroll-up/down of steamboat.
As a prioritization scheme of the utility model embodiment, screw jack 9 for specified tonnage be 1000kN screw machine lifting jack; Described fluid pressure type lifting jack 8 for specified tonnage be 5000kN fluid pressure type lifting jack, fluid pressure type lifting jack is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed.
As a prioritization scheme of the utility model embodiment, this test unit also comprises the safe steel cable 11 for the protection of testing column.
Below in conjunction with drawings and the specific embodiments, application principle of the present utility model is further described.
As depicted in figs. 1 and 2, the non-unloading reinforcement experiment of the eccentric compression post device of the utility model embodiment, comprise: counter-force rigid frame, portable rigid beam 6 moving up and down, load applying device, two power sensors 7 and the strainmeter being connected with two power sensors, counter-force rigid frame is comprised of two rigid frame columns 10 and fixed cross beam 1, testing column to be measured is installed between fixed cross beam 1 and portable rigid beam 6, and portable rigid beam 6 is arranged between two rigid frame columns 10; Unidirectional cutter hinge 2 and pressure distribution plate 3 are all set between the fixed cross beam 1 of testing column 4 and its upper end and between the portable rigid beam 6 of testing column 4 and its lower end, pressure distribution plate all with testing column styletable end contact; This test unit also comprises the fastening piece 5 of the paired preparation in styletable place that is arranged on testing column, referring to Fig. 2, this fastening piece consists of two semicircle steel plate 5-1 and bolt 5-2, the two ends of two semicircle steel plate 5-1 are fastenedly connected by bolt 5-2 respectively, during actual fabrication, can on semicircle steel plate, offer some apertures with screw thread, on aperture, coordinate fastening bolt simultaneously.
Load applying device comprises two screw jacks 9 and a fluid pressure type lifting jack 8, and fluid pressure type lifting jack 8 is arranged between two screw jacks 9.Screw jack 9 for specified tonnage be 1000kN screw machine lifting jack; Fluid pressure type lifting jack 8 for specified tonnage be 5000kN fluid pressure type lifting jack, fluid pressure type lifting jack is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed.
Portable rigid beam 6 cuts section bar for steel construction box, and the length breadth ratio of portable rigid beam 6 is 4, is provided with the intensity floor of putting more energy in portable rigid beam 6, and portable rigid beam 6 two ends respectively arrange four steamboats; The medial surface setting of rigid frame column 10 can make the conduit of the free scroll-up/down of steamboat.
This test unit also comprises the safe steel cable 11 for the protection of testing column.
Experimental provision of the present utility model, when making, considers that large-tonnage long column testing machine has the high feature of loading and convenient test and precision comprehensively, but long-time voltage regulation result is poor, and machine abrasion itself are large, hold for a long time lotus pressurization and can lower service life of a machine; Oil pressure thousand nearly top loading ranges are large, do not need need to manually shake pressure as mechanic jacks, but long-time interior voltage regulation result are poor, has oil leak phenomenon; Separate unit mechanic jacks is due to mostly by manual operation, and maximum load tonnage is less than normal, can not meet the range requirement of full size post, but long-time interior voltage regulation result is fabulous.After considering loading equipemtn relative merits separately, and consider after the convenience and controllability of safety factor and operation, developed the non-unloading reinforcement experiment of eccentric compression post of the present utility model device as shown in Figure 1, this device each several part work coordination, is well positioned to meet the requirement of the each side such as range ability, voltage regulation result, measuring accuracy, security, controllability, ease for operation.By this device, scientific experimentation and the actual post component test of engineering that can complete the model post of eccentric compression detect, for research and analysis provide a large amount of preciousnesses reliable test data.
Test unit of the present utility model is when carrying out the non-unloading reinforcement experiment of eccentric compression post, by the unidirectional cutter hinge of post upper and lower side, impose on the vertical Compression of post, this vertical load with line load formal distribution, is an Eccentric Load that has certain eccentric throw with respect to column section centre of form axis along cutter hinge length.
Test method: according to the relevant regulations of < < Architectural Structure Experimentation rules > >, on long column oil test machine accurately to the fluid pressure type lifting jack of this test unit and support the use with it high-voltage electric oil pump and demarcate, be opposite to two power sensors on screw machine lifting jack and with it matching used strainmeter demarcate; Successively by 3 lifting jack, to move up and down formula rigid beam, post upper and lower side cutter hinge, pressure distribution plate, testing column in place by Fig. 1 position, first-class fastening piece and safe steel cable, and carry out how much centerings of each several part.Fastening piece of the present utility model, by tightening the bolt on fastening piece, makes semicircle steel plate coupled columns end surfaces produce local horizontal pressure, reaches the object that improves styletable concrete local compressed strength.After the preliminary works such as, centering in place at each several part, calibration complete, should check that whether safe steel cable is in non-stress state.By observing the strain variation on the strainmeter being connected with two power sensors, command two operators to shake simultaneously and press two screw jacks, make its portable crossbeam of pushing tow symmetrically and evenly, thereby coupled columns applies xial feed, when payload values reaches the design load value (corresponding stress level index is β) of " first stage load-bearing ", stop shaking pressure.At initial stage under first stage payload values effect, reinforced column makes the meeting of the actual compressive stress ratio of post progressively lower than β the distortion of generation elastic compression.Therefore should observe the variation of strain on strainmeter the 1st week planted agent, suitably do if desired ftercompction operation, when strain value no longer declines or only has the variation of several microstrains, explanation reaches voltage stabilizing level substantially.This process has been utilized the good feature of mechanic jacks voltage regulation result just.The payload values that " first stage load-bearing " is corresponding generally can not surpass reinforced column limit failing load 60%, although manually-operated mechanic jacks has the advantages that specified tonnage is relatively little, in device, use side by side two 1000kN screw machine lifting jack just can meet the demands.To the stable size of bearing, be N
0xial feed effect and completed strengthening construction pre-service testing column carry out strengthening construction, and maintenance or be bonded to the corresponding length of time.Through the maintenance in the corresponding length of time or fixed, the intensity of back-up coat itself and reaching after designing requirement with the cohesive strength of former post faying face, the 5000kN hydraulic jack that starts to enable high-pressure oil pump and be positioned at portable rigid beam bottom, and by observing hydralic pressure gauge reading, its loading velocity and class of loading are controlled, realize and complete " subordinate phase load-bearing " process of the test to reinforced column, until testing column destroys after reaching maximum load capacity.In " subordinate phase load-bearing " process, two mechanical jacks are deactivated gradually, and hydraulic jack progressively bears increasing and even whole Compression (therefore the axis of a cylinder power under loads at different levels should be the xial feed sum that three lifting jack apply).Reinforced column reaches after maximum load capacity, and oil pressure gauge pointer starts rollback, payload values return back to maximum load capacity 80% after, stop experiment, close hydraulically operated equipment (HOE) oil return, off-test.What mostly occur greatly due to reinforced column is the obvious ductile fracture of omen, so oil pressure gauge pointer rollback is slow, owing to also having the protection of safe steel cable, security has obtained good guarantee.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. the non-unloading reinforcement experiment of eccentric compression post device, comprise counter-force rigid frame, portable rigid beam moving up and down (6), load applying device, two power sensors (7) and the strainmeter being connected with two power sensors, counter-force rigid frame is comprised of two rigid frame columns (10) and fixed cross beam (1), testing column to be measured is installed between fixed cross beam (1) and portable rigid beam (6), it is characterized in that: described portable rigid beam (6) is arranged between two rigid frame columns (10); Unidirectional cutter hinge (2) and pressure distribution plate (3) are all set between the fixed cross beam (1) of testing column (4) and its upper end and between the portable rigid beam (6) of testing column (4) and its lower end, pressure distribution plate all with testing column styletable end contact; Described test unit also comprises the fastening piece (5) of the paired preparation in styletable place that is arranged on testing column, and described fastening piece consists of two semicircle steel plates (5-1) and bolt (5-2).
2. the non-unloading reinforcement experiment of eccentric compression post according to claim 1 device, it is characterized in that: described load applying device comprises two screw jacks (9) and a fluid pressure type lifting jack (8), and fluid pressure type lifting jack (8) is arranged between two screw jacks (9).
3. the non-unloading reinforcement experiment of eccentric compression post according to claim 1 device, it is characterized in that: described portable rigid beam (6) cuts section bar for steel construction box, the length breadth ratio of portable rigid beam (6) is 4, in portable rigid beam (6), be provided with the intensity floor of putting more energy into, portable rigid beam (6) two ends respectively arrange four steamboats; The medial surface setting of described rigid frame column (10) can make the conduit of the free scroll-up/down of steamboat.
4. the non-unloading reinforcement experiment of eccentric compression post according to claim 2 device, is characterized in that: described screw jack (9) for specified tonnage be 1000kN screw machine lifting jack; Described fluid pressure type lifting jack (8) for specified tonnage be 5000kN fluid pressure type lifting jack, fluid pressure type lifting jack is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed.
5. the non-unloading reinforcement experiment of eccentric compression post according to claim 1 device, is characterized in that: described test unit also comprises the safe steel cable (11) for the protection of testing column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420095005.2U CN203849110U (en) | 2014-03-04 | 2014-03-04 | Eccentric compression column non-unloading strengthening testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420095005.2U CN203849110U (en) | 2014-03-04 | 2014-03-04 | Eccentric compression column non-unloading strengthening testing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822832A (en) * | 2014-03-04 | 2014-05-28 | 湖南工业大学 | Eccentric compression column non-unloading strengthening testing device |
| CN104535427A (en) * | 2014-12-12 | 2015-04-22 | 广西科技大学 | Static loading testing method of continuous beam |
| CN108303325A (en) * | 2018-01-08 | 2018-07-20 | 中国建筑股份有限公司 | A kind of intelligent shaft force loading system using distribution type fiber-optic measuring device |
| CN111551439A (en) * | 2020-05-12 | 2020-08-18 | 广东工业大学 | Integral type bias voltage experimental apparatus |
-
2014
- 2014-03-04 CN CN201420095005.2U patent/CN203849110U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822832A (en) * | 2014-03-04 | 2014-05-28 | 湖南工业大学 | Eccentric compression column non-unloading strengthening testing device |
| CN104535427A (en) * | 2014-12-12 | 2015-04-22 | 广西科技大学 | Static loading testing method of continuous beam |
| CN108303325A (en) * | 2018-01-08 | 2018-07-20 | 中国建筑股份有限公司 | A kind of intelligent shaft force loading system using distribution type fiber-optic measuring device |
| CN111551439A (en) * | 2020-05-12 | 2020-08-18 | 广东工业大学 | Integral type bias voltage experimental apparatus |
| CN111551439B (en) * | 2020-05-12 | 2022-07-12 | 广东工业大学 | Integral type bias voltage experimental apparatus |
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