CN103575597A - Axial compression column non-loading reinforcement test device - Google Patents
Axial compression column non-loading reinforcement test device Download PDFInfo
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- CN103575597A CN103575597A CN201310506519.2A CN201310506519A CN103575597A CN 103575597 A CN103575597 A CN 103575597A CN 201310506519 A CN201310506519 A CN 201310506519A CN 103575597 A CN103575597 A CN 103575597A
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Abstract
The invention discloses an axial compression column non-loading reinforcement test device. The axial compression column non-loading reinforcement test device comprises a counter-force rigid frame, a movable rigid cross beam capable of moving up and down, a loading applying device, two force sensors and a strain gauge connected with the two force sensors, wherein the counter-force rigid frame consists of two rigid frame upright posts and a fixed cross beam; a testing column to be detected is arranged between the fixed cross beam and the movable rigid cross beam; the movable rigid cross beam is arranged between the two upright posts; the loading applying device comprises two screw type lifting jacks and a hydraulic type lifting jack; the hydraulic type lifting jack is arranged between the two screw type lifting jacks; a flat plate hinge and a pressure distribution plate are arranged between the testing column and the fixed cross beam at the upper end of the testing column; another pressure distribution plate and a ball hinge are arranged between the testing column and the rigid cross beam at the lower end of the testing column; the pressure distribution plates are contacted with ends of the column. The test device disclosed by the invention is simple in structure, safe and reliable, high in pressure stabilization effect under high loading condition, and free of machine consumption.
Description
Technical field
The invention belongs to test unit, be specifically related to the non-unloading reinforcement experiment of a kind of Axial-compression Column 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 or be bonded to the corresponding length of time, then complete " 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 Axial-compression Column of Reinforced Concrete stress performance is reinforced as the non-unloading of compression member, meets the experimental study that the non-unloading of vast scale Axial-compression Column of engineering actual conditions reinforces significant.
Summary of the invention
Object of the present invention overcomes that the voltage regulation result existing in prior art is poor, and machine loss is large, and awkward problem, the non-unloading reinforcement experiment of a kind of Axial-compression Column device is provided, and this device is not only simple in structure, safe and reliable, and under top load, voltage regulation result is good, without machine loss.
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 object of the present invention, the technical scheme of employing is as follows:
The non-unloading reinforcement experiment of Axial-compression Column 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 columns; 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; Dull and stereotyped hinge and pressure distribution plate are set between testing column and the fixed cross beam of its upper end, between the portable rigid beam of testing column and its lower end, pressure distribution plate and ball pivot are set, pressure distribution plate all contacts with styletable.
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.
Further, 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 present invention 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, without machine loss.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Wherein, 1-fixed cross beam, the dull and stereotyped hinge of 2-, 3-pressure distribution plate, 4-testing column, 5-ball pivot, the portable rigid beam of 6-, 7-power sensor, 8-fluid pressure type lifting jack, 9-screw jack, 10-column, the safe steel cable of 11-.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the non-unloading reinforcement experiment of Axial-compression Column provided by the invention apparatus structure.For convenience of explanation, only show part related to the present invention.
The non-unloading reinforcement experiment of Axial-compression Column of the present invention device, comprising: 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 columns 10 and fixed cross beam 1, and testing column 4 to be measured is installed between fixed cross beam 1 and portable rigid beam 6, and portable rigid beam 6 is arranged between two columns 10; 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; Dull and stereotyped hinge 2 and pressure distribution plate 3 are set between the fixed cross beam 1 of testing column 4 and its upper end, pressure distribution plate 3 and ball pivot 5 are set between the portable rigid beam 6 of testing column 4 and its lower end, pressure distribution plate 3 all contacts with styletable.
A prioritization scheme as the embodiment of the present invention, 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 embodiment of the present invention, screw jack 9 for specified tonnage be 1000kN screw machine lifting jack.
As a prioritization scheme of the embodiment of the present invention, fluid pressure type lifting jack 8 for specified tonnage be 5000kN fluid pressure type lifting jack, fluid pressure type lifting jack 8 is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed.
As a prioritization scheme of the embodiment of the present invention, 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 invention is further described.
As shown in Figure 1, the non-unloading reinforcement experiment of the Axial-compression Column of embodiment of the present invention device, comprising: 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 columns 10 and fixed cross beam 1, and testing column 4 to be measured is installed between fixed cross beam 1 and portable rigid beam 6, and portable rigid beam 6 is arranged between two columns 10; 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 column 10 can make the conduit of the free scroll-up/down of steamboat.Load applying device comprises two screw jacks 9 and a fluid pressure type lifting jack 8, 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 8 is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed; Dull and stereotyped hinge 2 and pressure distribution plate 3 are set between the fixed cross beam 1 of testing column 4 and its upper end, pressure distribution plate 3 and ball pivot 5 are set between the portable rigid beam 6 of testing column 4 and its lower end, pressure distribution plate 3 all contacts with styletable.This test unit also comprises the safe steel cable 11 for the protection of testing column.
Experimental provision of the present invention, 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 Axial-compression Column of the present invention 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 axial compression detect, for research and analysis provide a large amount of preciousnesses reliable test data.
Test unit of the present invention is when carrying out the non-unloading reinforcement experiment of Axial-compression Column, by the ball pivot of post lower end and the flat board of pressure distribution plate and post upper end, cut with scissors the vertical Compression that imposes on post with pressure distribution plate, this vertical load along pressure distribution plate with area load formal distribution, be one along the equally distributed axial compression load of column section.
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 the dull and stereotyped hinge of 3 lifting jack, portable rigid beam, post upper end, post lower end ball pivot, pressure distribution plate and testing column are pressed to Fig. 1 position in place, first-class safe steel cable, and carry out the geometry centerings of each several part.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 invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. the non-unloading reinforcement experiment of Axial-compression Column 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 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), it is characterized in that: described portable rigid beam (6) is arranged between two columns (10); 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 (8); Dull and stereotyped hinge (2) and pressure distribution plate (3) are set between the fixed cross beam (1) of testing column (4) and its upper end, pressure distribution plate (3) and ball pivot (5) are set between the portable rigid beam (6) of testing column (4) and its lower end, and pressure distribution plate (3) all contacts with styletable.
2. experimental provision is reinforced in the non-unloading of Axial-compression Column according to claim 1, 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 column (10) can make the conduit of the free scroll-up/down of steamboat.
3. experimental provision is reinforced in the non-unloading of Axial-compression Column according to claim 1, it is characterized in that: described screw jack (9) for specified tonnage be 1000kN screw machine lifting jack.
4. experimental provision is reinforced in the non-unloading of Axial-compression Column according to claim 1, it is characterized in that: described fluid pressure type lifting jack is that (8) specified tonnage is 5000kN fluid pressure type lifting jack, and fluid pressure type lifting jack (8) is connected with the high-voltage electric oil pump that high-precision hydraulic table is housed.
5. experimental provision is reinforced in the non-unloading of Axial-compression Column according to claim 1, it is characterized in that: described test unit also comprises the safe steel cable (11) for the protection of testing column.
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| CN103822832A (en) * | 2014-03-04 | 2014-05-28 | 湖南工业大学 | Eccentric compression column non-unloading strengthening testing device |
| CN105910909A (en) * | 2016-03-29 | 2016-08-31 | 中国地震局地壳应力研究所 | Multi-diameter rock core dual-ring direct tension rock tensile strength tester |
| CN105928788A (en) * | 2016-04-25 | 2016-09-07 | 重庆大学 | Spherical hinge constraining method capable of realizing hinge joint compression on 1000-t testing machine |
| WO2018072096A1 (en) * | 2016-10-18 | 2018-04-26 | 金宙科技有限公司 | Measurement system for calibrating automobile spring parameter |
| CN108362453A (en) * | 2018-04-28 | 2018-08-03 | 福州大学 | Flexural pivot loads the measuring device and measuring method of cross section isotropism axis compression member lateral deflection |
| CN108396791A (en) * | 2018-04-20 | 2018-08-14 | 山东大学 | A kind of multifunctional large-scale roadbed experimental system and experimental method |
| CN108871955A (en) * | 2018-06-28 | 2018-11-23 | 华侨大学 | Bias test knife hinge device, bias test mechanism and its test method |
| CN109540442A (en) * | 2018-11-02 | 2019-03-29 | 湖南工业大学 | The experimental rig of phantom frame beam column interior joint receiving horizontal earthquake action |
| CN113281184A (en) * | 2021-06-15 | 2021-08-20 | 王永泉 | Reliability test method for reinforced concrete frame column active unloading scheme |
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| CN103822832A (en) * | 2014-03-04 | 2014-05-28 | 湖南工业大学 | Eccentric compression column non-unloading strengthening testing device |
| CN105910909A (en) * | 2016-03-29 | 2016-08-31 | 中国地震局地壳应力研究所 | Multi-diameter rock core dual-ring direct tension rock tensile strength tester |
| CN105910909B (en) * | 2016-03-29 | 2018-12-21 | 中国地震局地壳应力研究所 | The double annulus uniaxial direct tensile Tensile Strength of Rock testing machines of more diameter cores |
| CN105928788A (en) * | 2016-04-25 | 2016-09-07 | 重庆大学 | Spherical hinge constraining method capable of realizing hinge joint compression on 1000-t testing machine |
| WO2018072096A1 (en) * | 2016-10-18 | 2018-04-26 | 金宙科技有限公司 | Measurement system for calibrating automobile spring parameter |
| CN108396791A (en) * | 2018-04-20 | 2018-08-14 | 山东大学 | A kind of multifunctional large-scale roadbed experimental system and experimental method |
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| CN108871955A (en) * | 2018-06-28 | 2018-11-23 | 华侨大学 | Bias test knife hinge device, bias test mechanism and its test method |
| CN109540442A (en) * | 2018-11-02 | 2019-03-29 | 湖南工业大学 | The experimental rig of phantom frame beam column interior joint receiving horizontal earthquake action |
| CN113281184A (en) * | 2021-06-15 | 2021-08-20 | 王永泉 | Reliability test method for reinforced concrete frame column active unloading scheme |
| CN117147322A (en) * | 2023-10-30 | 2023-12-01 | 四川省公路规划勘察设计研究院有限公司 | Pier stud load test device |
| CN117147322B (en) * | 2023-10-30 | 2023-12-29 | 四川省公路规划勘察设计研究院有限公司 | Pier stud load test device |
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Application publication date: 20140212 |