CN102749252A - Novel flexural member sustained loading test device based on secondary level effect - Google Patents
Novel flexural member sustained loading test device based on secondary level effect Download PDFInfo
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- CN102749252A CN102749252A CN2011101000645A CN201110100064A CN102749252A CN 102749252 A CN102749252 A CN 102749252A CN 2011101000645 A CN2011101000645 A CN 2011101000645A CN 201110100064 A CN201110100064 A CN 201110100064A CN 102749252 A CN102749252 A CN 102749252A
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Abstract
The invention relates to a novel flexural member sustained loading test device based on a secondary level effect. The device comprises an inclined strut (1), a built-in beam (2), a screw (3), a lever beam b (4), a lever beam a (5), a distribution beam (6), a weight hanging plate (7), a steel plate b (8), a dialgage bracket (9), an inclined strut b (10), a flexural test piece (11), a steel plate a (12), a counterforce beam (13) and a static data acquisition system. The weight hanging plate (7) is hung at one end of the lever beam b (4), the other end of which is fixed on the steel plate b (8). The lever beam a (5) is arranged between the steel plate b (8) and the steel plate a (12), and the flexural test piece (11) is disposed on the counterforce beam (13). Compared with the prior art, the device of the invention has the advantages of convenient assembling, strong applicability, stable loading performance, etc., and can be conveniently applied to flexural member long-term performance tests as well as flexural member durability tests under load-environment combined action.
Description
Technical field
The invention belongs to field of civil engineering, be specifically related to a kind of test unit that can apply lasting load, for the endurance quality of research flexural member under varying environment and load coupling provides feasible loading tool to flexural member.
Background technology
The exploitation of the lasting charger of flexural member helps the carrying out of following two types of tests: the one, and the flexural member long-term performance test; The 2nd, flexural member endurancing under load and the environment acting in conjunction.
The long-term performance test of flexural member load mode commonly used has accumulation load method, lever method, lifting jack Loading Method and screw rod method.The accumulation load method load is stable, but receives space constraint, needs a large amount of weights, and the loading level is limited.Lifting jack Loading Method and screw rod method rely on counterforce device that loading is provided, and adopt force transducer control load size, and shortcoming is that the fluctuating load level can reduce in time.It is that load is stable that lever method loads advantage, can conveniently control the load size through regulating arm of force length, realizes bigger class of loading.
The method that loads after the first deterioration is adopted in the research of flexural member performance degradation more under the environmental activity, is not inconsistent with both actings in conjunction in the actual engineering.With the Rust of Rebar in Concrete is example; In actual engineering; Steel bar corrosion is to take place in the process of structure bearing load, and concrete component produces the crack under the load action, and oxygen, water and etching medium can get into more easily; Compare the corrosion quickening with the member that does not continue under the load action, the distribution longitudinally of reinforcing bar cross section corrosion rate is also different.In addition, the development of Corroded Reinforced Concrete Beam crack, distortion also is different from the beam that loads after the first corrosion under the lasting load.For this reason, Chinese scholars begins to pay close attention to durability of structures problem under load and the environment acting in conjunction in recent years.
Summary of the invention
The object of the invention is exactly to provide a kind of easy to assembly for the defective that overcomes above-mentioned prior art existence; Applicability is strong; Loading performance is stable, and the flexural member that can be conveniently used in flexural member endurancing under flexural member long-term performance test and load and the environment acting in conjunction continues load testing machine.
The object of the invention can be realized through following technical scheme: the novel flexural member based on the secondary leverage continues load testing machine, it is characterized in that this device comprises diagonal brace a1, build-in beam 2; Screw rod 3, lever beam b4, lever beam a5, distribution beam 6; Counterweight hanging scaffold 7, steel plate b8, dial gauge support 9, diagonal brace b10; Receive curved test specimen 11, steel plate a12, reaction beam 13 and static data acquisition system, described steel plate b8 is connected through diagonal brace a1 with steel plate a12 top; The bottom is provided with reaction beam 13, described lever beam b4 one end suspension counterweight hanging scaffold 7, and the other end is fixed on the steel plate b8; Described lever beam a5 is arranged between steel plate b8 and the steel plate a12, describedly be arranged on the reaction beam 13 by curved test specimen 11, receives curved test specimen 11 sides to be provided with dial gauge support 9; The top is provided with distribution beam 6, and described diagonal brace b10 connects dial gauge support 9 and steel plate b8, and described static data acquisition system connection receives curved test specimen 11 bottom-loaded ends; The vertical force that weight end counterweight produces, through lever beam b4, lever beam a5 and reaction beam 13 twice lever force transmission are amplified.
Described static data acquisition system comprises pressure transducer 14, data collecting instrument 15 and PC 16, and described pressure transducer is arranged on and receives curved test specimen 11 bottom-loaded ends, and connects data collecting instrument 15 through lead 17, and data collecting instrument 15 connects PC 16.
Described steel plate b8 is U type frame shape, its top truck dead lever beam b4.
Described steel plate a12 is U type frame shape, and its both upper ends thereof is connected with screw rod 3 through build-in beam 2.
Described distribution beam 6 is arranged on the steel plate a12, and its upper surface connects lever beam a5, and the lower surface connection receives curved test specimen 11.
Describedly receive curved test specimen 11 to be provided with 3～18, be arranged on the reaction beam 13 through dial gauge support 9.
One end of described lever beam b4 suspension counterweight hanging scaffold 7 is provided with three horizontal suppending holes successively.
Compared with prior art, the present invention has overcome the unsettled shortcoming of traditional screw rod charger load.Realize that through the secondary leverage loading end load amplifies, device applies lasting load as the self-equilibrating body to test specimen, and the outside is not exerted an influence.Increase step by step to hang and carry, the actual value of adopts pressure sensor test loading end power is obtained to hang and is carried-the Li calibration curve.It is linear that calibration curve is, and its actual measurement lever enlargement factor is consistent with theoretical value, and enlargement factor can reach 72～90 times, hangs size and the enlargement factor control loaded end power of carrying through adjustment.This device is easy to assembly, and applicability is strong, and loading performance is stable, can be conveniently used in flexural member endurancing under flexural member long-term performance test and load and the environment acting in conjunction.This device load is stable simultaneously, and load level is adjustable, and enlargement factor is high, can be used for the loading of different geometrical size member, and can carry out the loading of many test specimens simultaneously.
Description of drawings
Fig. 1 continues the charger synoptic diagram for flexural member of the present invention;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is lever beam b4, and lever beam a5 power is transmitted enlarged diagram;
Fig. 4 is that reaction beam 13 power are transmitted synoptic diagram;
Fig. 5 is a static data acquisition system synoptic diagram;
Fig. 6 is that testing machine loads calibration map among the embodiment;
Fig. 7 is the Long-term Deflection development figure of Corroded Reinforced Concrete Beam.
Among the figure: 1-diagonal brace a, 2-build-in beam, 3-screw rod, 4-lever beam b, 5-lever beam a, 6-distribution beam; 7-counterweight hanging scaffold, 8-steel plate b, 9-dial gauge support, 10-diagonal brace b, 11-receive curved test specimen, 12-steel plate a; The 13-reaction beam, 14-pressure transducer, 15-data collecting instrument, 16-PC machine, 17-lead.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment 1
Like Fig. 1～2, shown in 5, based on the lasting load testing machine of the novel flexural member of secondary leverage, this device comprises diagonal brace a1, build-in beam 2, screw rod 3; Lever beam b4, lever beam a5, distribution beam 6, counterweight hanging scaffold 7; Steel plate b8, dial gauge support 9, diagonal brace b10 receives curved test specimen 11; Steel plate a12, reaction beam 13 and static data acquisition system, static data acquisition system comprise pressure transducer 14, data collecting instrument 15 and PC 16.
Steel plate b8 is U type frame shape, and steel plate a12 is U type frame shape, and steel plate b8 and steel plate a12 form a support; Steel plate b8 be connected through diagonal brace a1 with steel plate a12 top, the bottom is provided with reaction beam 13, steel plate a12 both upper ends thereof is connected with screw rod 3 through build-in beam 2; Outwardly directed lever beam b4 is fixed on steel plate b8 top, lever beam b4 one end suspension counterweight hanging scaffold 7, and the other end is fixed on the steel plate b8; Lever beam a5 is arranged between steel plate b8 and the steel plate a12, receives curved test specimen 11 to be provided with 6, is arranged on the reaction beam 13 through dial gauge support 9; Receive curved test specimen 11 tops to be provided with distribution beam 6, distribution beam 6 is arranged on the steel plate a12, and its upper surface connects lever beam a5; The lower surface connection receives curved test specimen 11, and diagonal brace b10 connects dial gauge support 9 and steel plate b8, and pressure transducer is arranged on and receives curved test specimen 11 bottom-loaded ends; And through lead 17 connection data collecting instruments 15, data collecting instrument 15 connects PCs 16.
The long 2500mm of whole device, wide 450mm, high 1800mm, the about 500kg of weight.
Weight end counterweight is placed on the counterweight hanging scaffold 7, the vertical force of generation, and through lever beam b4, lever beam a5 and reaction beam 13 twice lever force transmission are amplified, and the transmitting portions that continues the charger load mainly comprises lever beam b4, lever beam a5 and reaction beam 13.Lever force transmittance process such as Fig. 3.The suspension of right-hand member E place heavily is the counterweight of G, and through leverage for the first time, the C place loads amplifies l
1Doubly, N=l
1G, the power that N receives for the C place is hung three different lifting hole(eyelet)s place in the E place, l with counterweight
1Can get 8,9,10 respectively.Through leverage for the second time, the B place loads amplifies l again
2Doubly, l
2Get 9, F=l
2N, the power that F receives for the B place.Through twice leverage, F=l
2L
1G=nG loads and amplifies 72,81,90 times.
Reaction beam power transmittance process is as shown in Figure 4: the counter-force T of lever end
1, T
2(T
1=(l
1-1) G, T
2=(l
2-1) l
1G) be delivered to bottom reaction beam 13 through steel plate b8 and steel plate a12, F is delivered to the bottom reaction beam through test specimen, and reaction beam keeps balance, and ground is not produced additional effect.T wherein
1Be lever b counter-force; T
2Be lever a counter-force; F is a loading end pressure; G is heavy for the hanging scaffold counterweight.
Increase lever end counterweight weight step by step, adopts pressure sensor is tested loading end power, through data collecting instrument read sensor power size, obtains counterweight-Li calibration curve, sees Fig. 6.Consider that the lever enlargement factor is bigger, the existence of mismachining tolerance also can cause the difference of lever enlargement factor and theoretical multiple, before loading charger is done debugging and demarcates, to understand error and to attempt improving.Fig. 6 is a calibration curve before and after improving, and its half-mark is decided curve and is linear basically, shown in solid line among the figure, explains that improving the back enlargement factor can keep constant.
The calibration curve fit equation is respectively before and after improving:
F＝77.8·G+3.3 (1)
F＝80.8·G+2.6 (2)
Theoretical loading enlargement factor is 81, and the back constant term is the starting force that the lever deadweight causes.Can know that improving back loading multiple conforms to theoretical value.
Adopt four bench teat experiment devices of independent development that 18 Corroded Reinforced Concrete Beam are loaded for a long time, realize the acting in conjunction of load and Rust of Rebar in Concrete process.Wherein the following 6 test specimens loading of a charger entity is seen Fig. 6.Fig. 7 has provided the amount of deflection progress curve of reinforced beam under one group of different rusting rate.The material of beam, arrangement of reinforcement, size are all identical, and load level is 33% of a calculating limit load, and the impressed current density that C-33-0, C-33-25, C-33-50 and C-33-100 are corresponding is respectively 0,25 μ A/cm
2, 50 μ A/cm
2, 100 μ A/cm
2
By above test, above-mentioned charger can successfully be realized the lasting loading of flexural member, can be used for studying flexural member endurancing under flexural member long-term performance test and load and the environment acting in conjunction.
For carrying out flexural member endurancing under flexural member long-term performance test or load and the environment acting in conjunction, the present invention can accomplish loading tasks according to the following step:
(1) test continues charger loading enlargement factor (size of loading end power and counterweight weight ratio)
increases lever end counterweight weight step by step; Loading end power is tested; Through data collecting instrument read sensor power size, obtain counterweight-Li calibration curve;
(2) realization of flexural member endurancing under flexural member long-term performance test or load and the environment acting in conjunction
Claims (7)
1. the novel flexural member based on the secondary leverage continues load testing machine, it is characterized in that this device comprises diagonal brace a (1), build-in beam (2); Screw rod (3), lever beam b (4), lever beam a (5), distribution beam (6); Counterweight hanging scaffold (7), steel plate b (8), dial gauge support (9), diagonal brace b (10); Receive curved test specimen (11), steel plate a (12), reaction beam (13) and static data acquisition system, described steel plate b (8) is connected through diagonal brace a (1) with steel plate a (12) top; The bottom is provided with reaction beam (13), described lever beam b (4) one ends suspension counterweight hanging scaffold (7), and the other end is fixed on the steel plate b (8); Described lever beam a (5) is arranged between steel plate b (8) and the steel plate a (12), describedly be arranged on the reaction beam (13) by curved test specimen (11), receives curved test specimen (11) side to be provided with dial gauge support (9); The top is provided with distribution beam (6), and described diagonal brace b (10) connects dial gauge support (9) and steel plate b (8), and described static data acquisition system connection receives curved test specimen (11) bottom-loaded end; The vertical force that weight end counterweight produces, through lever beam b (4), lever beam a (5) and reaction beam (13) twice lever force transmission are amplified.
2. the novel flexural member based on the secondary leverage according to claim 1 continues load testing machine; It is characterized in that; Described static data acquisition system comprises pressure transducer (14), data collecting instrument (15) and PC (16); Described pressure transducer is arranged on and receives curved test specimen (11) bottom-loaded end, and connects data collecting instrument (15) through lead (17), and data collecting instrument (15) connects PC (16).
3. the novel flexural member based on the secondary leverage according to claim 1 continues load testing machine, it is characterized in that described steel plate b (8) is U type frame shape, its top truck dead lever beam b (4).
4. the novel flexural member based on the secondary leverage according to claim 1 continues load testing machine, it is characterized in that described steel plate a (12) is U type frame shape, and its both upper ends thereof is connected with screw rod (3) through build-in beam (2).
5. the novel flexural member based on the secondary leverage according to claim 1 continues load testing machine, it is characterized in that described distribution beam (6) is arranged on the steel plate a (12), and its upper surface connects lever beam a (5), and the lower surface connection receives curved test specimen (11).
6. the novel flexural member based on the secondary leverage according to claim 1 continues load testing machine, it is characterized in that, describedly receives curved test specimen (11) to be provided with 3～18, is arranged on the reaction beam (13) through dial gauge support (9).
7. the novel flexural member based on the secondary leverage according to claim 1 continues load testing machine, it is characterized in that an end of described lever beam b (4) suspension counterweight hanging scaffold (7) is provided with three horizontal suppending holes successively.
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|---|---|---|---|
| CN2011101000645A CN102749252A (en) | 2011-04-20 | 2011-04-20 | Novel flexural member sustained loading test device based on secondary level effect |
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| CN2011101000645A CN102749252A (en) | 2011-04-20 | 2011-04-20 | Novel flexural member sustained loading test device based on secondary level effect |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760027A (en) * | 2014-01-02 | 2014-04-30 | 重庆大学 | Continuous and constant pressure rheological test device for coal rocks |
| CN104502212A (en) * | 2014-12-15 | 2015-04-08 | 深圳大学 | Loading device of corrosion test of concrete sample under stress action |
| CN106596287A (en) * | 2016-11-01 | 2017-04-26 | 同济大学 | Tool type masonry flexure strength test lateral loading device |
| CN106841577A (en) * | 2017-04-12 | 2017-06-13 | 山东大学 | It is adaptable to concrete loading device and method under load environment coupling |
| CN107340185A (en) * | 2017-06-22 | 2017-11-10 | 北京华横新技术开发公司 | A kind of bridge static loading test pre-stressed steel pipe concrete self-balancing type static test bed |
| CN110470542A (en) * | 2019-09-12 | 2019-11-19 | 辽宁科技大学 | Hold lotus reinforced beam durability loading device |
| CN110579402A (en) * | 2019-10-22 | 2019-12-17 | 哈尔滨工业大学（深圳） | Continuous loading device for researching creep characteristic of FRP reinforcing beam |
| CN112504587A (en) * | 2020-12-02 | 2021-03-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
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| CN101144764A (en) * | 2007-09-11 | 2008-03-19 | 中北大学 | Dynamic and static mechanics integrated test platform |
| CN101251468A (en) * | 2008-03-26 | 2008-08-27 | 深圳大学 | Loading equipment for corrosion test of concrete sample with stress action |
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Patent Citations (4)
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| US3685969A (en) * | 1970-05-11 | 1972-08-22 | Murdock Machine & Eng Co | Stress-corrosion tester |
| CN1050262A (en) * | 1989-09-14 | 1991-03-27 | 清华大学 | The refractory ceramics creep testing machine |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760027B (en) * | 2014-01-02 | 2015-11-18 | 重庆大学 | Continuous pressure constant voltage coal rheology test unit |
| CN103760027A (en) * | 2014-01-02 | 2014-04-30 | 重庆大学 | Continuous and constant pressure rheological test device for coal rocks |
| CN104502212A (en) * | 2014-12-15 | 2015-04-08 | 深圳大学 | Loading device of corrosion test of concrete sample under stress action |
| CN106596287A (en) * | 2016-11-01 | 2017-04-26 | 同济大学 | Tool type masonry flexure strength test lateral loading device |
| CN106596287B (en) * | 2016-11-01 | 2019-11-29 | 同济大学 | The lateral loading device of tool-type masonry anti-reflecting bending strength test |
| CN106841577B (en) * | 2017-04-12 | 2024-01-30 | 山东大学 | Concrete loading device and method applicable to load-environment coupling effect |
| CN106841577A (en) * | 2017-04-12 | 2017-06-13 | 山东大学 | It is adaptable to concrete loading device and method under load environment coupling |
| CN107340185A (en) * | 2017-06-22 | 2017-11-10 | 北京华横新技术开发公司 | A kind of bridge static loading test pre-stressed steel pipe concrete self-balancing type static test bed |
| CN110470542A (en) * | 2019-09-12 | 2019-11-19 | 辽宁科技大学 | Hold lotus reinforced beam durability loading device |
| CN110470542B (en) * | 2019-09-12 | 2024-03-08 | 辽宁科技大学 | Durable loading device for load-holding reinforced concrete beam |
| CN110579402B (en) * | 2019-10-22 | 2022-08-09 | 哈尔滨工业大学（深圳） | Continuous loading device for researching creep characteristic of FRP reinforcing beam |
| CN110579402A (en) * | 2019-10-22 | 2019-12-17 | 哈尔滨工业大学（深圳） | Continuous loading device for researching creep characteristic of FRP reinforcing beam |
| CN112504587A (en) * | 2020-12-02 | 2021-03-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN112504587B (en) * | 2020-12-02 | 2022-09-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
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Application publication date: 20121024 |