CN102494945B - Test apparatus for endurance of flexural member under load-environment coupling - Google Patents
Test apparatus for endurance of flexural member under load-environment coupling Download PDFInfo
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- CN102494945B CN102494945B CN201110363175.5A CN201110363175A CN102494945B CN 102494945 B CN102494945 B CN 102494945B CN 201110363175 A CN201110363175 A CN 201110363175A CN 102494945 B CN102494945 B CN 102494945B
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Abstract
The invention which relates to a test apparatus for mechanical properties of a flexural member under the continuous load action belongs to the civil engineering field, wherein the test apparatus is especially suitable for occasions for testing the endurance of a reinforced concrete flexural member under the environment-load coupling action. The test apparatus comprises the reinforced concrete flexural member, a tension rib, anchoring parts and circular shaft loading rods, the anchoring parts are symmetrically arranged on two ends of the pulling force rib, the circular shaft loading rods are symmetrically arranged on the pulling force rib, and the middle horizontal segment of the pulling force rib is in parallel with the top surface of the reinforced concrete flexural member. The apparatus of the invention, which has the advantages of simple structure, convenient operation, no restriction by the size of the member, no need of pairing or bunching combination, and high strength, can satisfy loading needs of any load ratio.
Description
Technical field
The present invention relates to the test unit of flexural member mechanical property under a kind of lasting load action, be particularly useful for studying the occasion of Reinforced Concrete Members with Flexure endurancing under environment and load coupling, belong to field of civil engineering.
Background technology
Xoncrete structure is all being worked under certain load action, and stands the many factors couplings such as sclerosis, infiltration, freeze thawing, chemical erosion, a large amount of without the reasonable residing virtual condition of reflect structure of the concrete durability achievement under load action.Since half a century, xoncrete structure causes the accident of too early destruction, the lost of life to be on the increase because permanance is not enough, and especially the Important Project such as dam, road, bridge, harbour and high-rise do not reach the accident that design period just destroys and happen occasionally and cause tremendous economic to lose and casualties.Therefore, system is carried out the permanance of xoncrete structure, member under dual or multiple damage factors effect and great science and technology and the theoretical difficult problem that military service performance study is current field of civil engineering.First the permanance of studying xoncrete structure, member under complex environment effect and load coupling must propose a set of endurance test system that can consider that a plurality of factors act on simultaneously.
At present, the action of long-term load of Reinforced Concrete Members with Flexure under normal operating condition mainly by lifting jack load, hanging basket carry and lever-loading mode simulate.There is following problem in these test units: the one, and load and need reaction frame, device is complicated, institute takes up space larger, cannot put into existing simulated acceleration test equipment, as residing working environments of simulation practical structures such as freezing-thawing test machine, carbonization case, artificial environment simulation boxes; The 2nd, prior art mostly is the member of combination in groups by reaction frame load application, the Residual Load Bearing Capacity that records member must shed to hold and carry a device and then carry out slow test, as the disclosed technology of patent CN 201681017U, when being carried out to Ultimate Strength Test, member to lay down applied lasting load, microfracture, strain and the amounts of deflection that after unloading, load causes etc. are most of can be recovered, therefore, in fact measurement result does not take into full account the impact that continues load action, reflection be the result under unloaded state; The 3rd, the applicable scantling of prior art charger is very little, and mainly for the small specimen test of material level, the maximum applicable sample dimensions of technology as disclosed in patent CN 101275982B is 100 * 100 * 400mm.
Summary of the invention
The object of the invention is to solve the shortcoming of existing flexural member action of long-term load simulation test device, provide a kind of simple in structure, easy to operate, volume is small and exquisite, do not account for test space, and can consider the test unit that the Reinforced Concrete Members with Flexure life-cycle military service performance of environment and load coupling and Residual Load Bearing Capacity change simultaneously.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention is a kind of charger of simulating continuous load effect of flexural member, comprise Reinforced Concrete Members with Flexure, pulling force rib, anchoring piece and circular shaft loading bar, anchoring piece symmetry is fixed on the two ends of pulling force rib, circular shaft loading bar is symmetricly set on pulling force rib, and the by-level section of pulling force rib is parallel to the end face of Reinforced Concrete Members with Flexure.
Pulling force rib balanced configuration of the present invention is in the both sides of Reinforced Concrete Members with Flexure, and the two ends of pulling force rib are anchored in respectively the lower area of flexural member both sides with anchoring piece, and the by-level section of pulling force rib is higher than the end face of Reinforced Concrete Members with Flexure.
Pulling force rib balanced configuration of the present invention is in the both sides of Reinforced Concrete Members with Flexure, and the two ends of pulling force rib are anchored in respectively the lower area of flexural member both sides with anchoring piece, and the by-level section of pulling force rib is lower than the end face of Reinforced Concrete Members with Flexure.
The oblique symmetry in both sides of Reinforced Concrete Members with Flexure of the present invention offers oblique reserved through hole, the aperture of oblique reserved through hole is greater than the diameter of pulling force rib, one end outlet in hole is on the end face of Reinforced Concrete Members with Flexure, other end outlet is in the lower position of side, Reinforced Concrete Members with Flexure both ends, the by-level section of described pulling force rib is higher than the end face of Reinforced Concrete Members with Flexure, and the two ends of pulling force rib are anchored at the lower area of side, flexural member both ends through reserved through hole.
The present invention also comprises loading bearing with holes, leaves circular groove in the middle of it.
Between Reinforced Concrete Members with Flexure of the present invention and circular shaft loading bar, be provided with circular groove keeper.
Reinforced Concrete Members with Flexure of the present invention (1) offers the circular groove that same circular shaft loading bar (4) diameter is identical or is embedded with ironware corresponding to the riding position of circular shaft loading bar (4).
Anchoring piece of the present invention is latch or bolt or weldment.
Pulling force rib of the present invention is stainless steel steel strand wires or the antiseptic high-durability steel wire of process or steel strand wires, and under environmental activity, permanance does not reduce.
Circular shaft loading bar of the present invention is stainless steel or the antiseptic high-durability steel wire of process or steel strand wires, and under environmental activity, permanance does not reduce.
The lasting load of member of the present invention under normal operating condition passes to circular shaft loading bar power by being fixed on the pulling force rib of straining on anchoring piece realizes, continue load position consistent with circular shaft loading bar position, the size that continues load action size and position and stretching force is determined by testing program.
Beneficial effect of the present invention is mainly manifested in:
1, this charger is simple in structure, easy to operate, is not subject to the restriction of scantling size, does not need member in pairs or combination in groups;
2, not corrosion of charger, intensity are high, can meet the loading needs of Arbitrary Load ratio;
3, do not need reaction frame to apply lasting load to member, charger volume is little, form integral body together with test component, take up space hardly, can make full use of existing durability test device as simulation member real work states such as freezing-thawing test machine, carbonization case, artificial environment simulation boxes, the permanance of research member under environment and load coupling;
4, do not need unloading test, when being carried out to Ultimate Strength Test, member do not need to lay down applied lasting load, can directly to holding the member (not laying down in the situation of working load) of the state of carrying, carry out continuous stress-strain, load-amount of deflection, the Mechanics Performance Testings such as Residual Load Bearing Capacity, and the charger of lasting load loads and there is no effect of contraction secondary, can truly reflect load and the impact of environment coupled action on member life-cycle military service performance and Residual Load Bearing Capacity, fully warranty test result discloses overall process failure mechanism and the damage failure procedure of reflection member under actual working state of member.
Accompanying drawing explanation
Fig. 1 is that structural representation-pulling force rib balanced configuration of the flexural member loading embodiment 1 that continues load is in the both sides of Reinforced Concrete Members with Flexure, pulling force rib horizontal segment is lower than flexural member end face, and pulling force rib two ends are anchored in respectively the structural representation of the situation of the lower area of holding left and right, flexural member both sides;
Fig. 2 is that structural representation-pulling force rib balanced configuration of the flexural member loading embodiment 2 that continues load is in the both sides of Reinforced Concrete Members with Flexure, pulling force rib horizontal segment is higher than flexural member end face, and pulling force rib two ends are anchored in respectively the structural representation of the situation of the lower area of holding left and right, flexural member both sides.
Fig. 3 be structural representation-pulling force rib horizontal segment of the flexural member loading embodiment 3 that continues load higher than flexural member end face, pulling force rib two ends are anchored at the structural representation of the lower area situation of side, flexural member both ends through preformed hole;
Fig. 4 is the structural representation of load and environment coupled action;
Fig. 5 is the structural representation that Residual Load Bearing Capacity loads;
Fig. 6 is for loading bearing diagrammatic cross-section;
Fig. 7 is for loading bearing elevational schematic view;
Fig. 8 circular groove keeper schematic diagram;
In figure, the 1st, Reinforced Concrete Members with Flexure, the 2nd, pulling force rib, the 3rd, anchoring piece, the 4th, circular shaft loading bar, the 5th, oblique reserved through hole, the 6th, environmental chamber, the 7th, loading bearing with holes, the 8th, distribute crossbeam, the 9th, power sensor, the 10th, lifting jack, the 11st, reaction frame, the 12nd, circular groove keeper.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is further described in detail:
A kind of charger of simulating flexural member 1 lasting load action, comprise that Reinforced Concrete Members with Flexure 1, pulling force rib 2, anchoring piece 3, circular shaft loading bar 4, oblique reserved through hole 5, anchoring piece 3 symmetries are fixed on the two ends of pulling force rib 2, circular shaft loading bar 4 is symmetricly set on pulling force rib 2, and the by-level section of pulling force rib 2 is parallel to the top surface of the beam of Reinforced Concrete Members with Flexure 1.
The power that the pulling force rib 2 that the lasting load of member under normal operating condition is fixed on anchoring piece 3 tension by two ends passes to circular shaft loading bar 4 realizes.Continue load position consistent with circular shaft loading bar 4 positions, the size that continues load action size and position and power is determined by testing program.
The lasting load action structure of reinforced concrete flexural member 1 has multiple, now exemplifies following three classical structures:
Fig. 1 is the structural representation that flexural member continues the loading embodiment 1 of load, pulling force rib 2 balanced configurations are in the both sides of Reinforced Concrete Members with Flexure 1, the by-level section of pulling force rib 2 is lower than the end face of Reinforced Concrete Members with Flexure 1, pulling force rib 2 two ends are anchored in respectively the lower area of flexural member two side ends, anchoring can be used the methods such as latch, bolt or welding, and the power that the pulling force rib 2 that the lasting load of member under normal operating condition is fixed on anchoring piece 3 tension by two ends passes to circular shaft loading bar 4 realizes.
Fig. 2 is the structural representation that flexural member continues the loading embodiment 2 of load, pulling force rib 2 balanced configurations are in the both sides of Reinforced Concrete Members with Flexure 1, the by-level section of pulling force rib 2 is higher than the end face of Reinforced Concrete Members with Flexure 1, pulling force rib 2 two ends are anchored in respectively the lower area of flexural member two side ends, anchoring can be used the methods such as latch, bolt or welding, and the power that the pulling force rib 2 that the lasting load of member under normal operating condition is fixed on anchoring piece 3 tension by two ends passes to circular shaft loading bar 4 realizes.
Fig. 3 is the structural representation that flexural member continues the loading embodiment 3 of load, pulling force rib 2 horizontal segments are higher than flexural member end face, pulling force rib 2 two ends are anchored at the lower area of side, flexural member both ends through the oblique reserved through hole 5 of Reinforced Concrete Members with Flexure 1, anchoring can be used the methods such as latch, bolt, ground tackle or welding, and the power that the pulling force rib 2 that the lasting load of member under normal operating condition is fixed on anchoring piece 3 tension by two ends passes to circular shaft loading bar 4 realizes.
For preventing that circular shaft loading bar 4 occurrence positions under the effect of pulling force rib 2 from moving, and can adopt following 3 kinds of solutions:
The one, the riding position of the load position circular shaft loading bar 4 when making Reinforced Concrete Members with Flexure 1 in Reinforced Concrete Members with Flexure 1 is reserved with the identical circular groove of circular shaft loading bar 4 diameters; The 2nd, when making Reinforced Concrete Members with Flexure 1, at the riding position embedded iron parts of load position circular shaft loading bar 4, during load to be applied, circular shaft loading bar 4 is welded on embedded iron parts; The 3rd, at load position, between Reinforced Concrete Members with Flexure 1 and circular shaft loading bar 4, lay with circular groove keeper 12, by the contact friction force between the bottom surface of circular groove keeper 12 and the end face of Reinforced Concrete Members with Flexure 1, guarantee the fixing of circular groove keeper 12, the schematic diagram of circular groove keeper 12 is as Fig. 8.
In concrete use procedure, first according to testing program requirement making flexural member and by member maintenance under standard conditions.After reaching design strength, design load active position is put and be fixed on to circular shaft loading bar 4; Pulling force rib 2 is placed on circular shaft loading bar 4; By the fixing one end of pulling force rib 2 of anchoring piece 3, the other end of stretch-draw pulling force rib 2 reaches after design load with the fixing other end of pulling force rib 2 of anchoring piece 3, and the size of described pulling force is determined by testing program.After the lasting load of member applies, the flexural member of load application is put into artificial environment simulation box 6, the actual working state of model configuration.The flexural member (situation shown in Fig. 3) that Fig. 4 is load application is put in the structural representation of load and environment coupled action in environmental chamber 6.Certainly, the flexural member that applying lasting load being put in environmental chamber 6 can be also the flexural member situation that continues load that applies shown in Fig. 1 or Fig. 2.After reaching design age, from environmental chamber 7, take out flexural member loading bearing 7 with holes is aimed to circular shaft loading bar 6, on circular shaft loading bar 6, press shown in Fig. 5 and arrange successively and distribute crossbeam 8, power sensor 9, lifting jack 10, finally at reaction frame 11 (reaction frame 11 can be also pressure or universal testing machine), above flexural member is applied to ultimate load, until structural failure.Fig. 6 is the diagrammatic cross-section of loading bearing 7 with holes, and Fig. 7 is the elevational schematic view of loading bearing 7 with holes, and the structure of loading bearing 7 with holes is as shown in Fig. 6 and 7.
Below by a complete specific embodiment, technical scheme of the present invention is elaborated:
(1) as shown in Figure 3; first make Component in Single Rectangular Section Reinforced Concrete Members with Flexure 1; the sectional dimension of flexural member 1 is b * h=150 * 300mm, length 3000mm, strength grade of concrete C20; configure 2 HRB335 reinforcing bars that diameter is 14mm; protective seam 30mm, symmetrical reserved 2 oblique holes 5 in flexural member 1/3 position, aperture 14mm; one end outlet in hole is in flexural member 1/3 position, and the outlet of the other end in hole is in the lower position of side, flexural member both ends.By the Reinforced Concrete Members with Flexure after moulding 1 form removal standard curing room maintenance 28 days two days later.
(2) when two loads of flexural member 1/3 position effect, according to the ultimate bearing capacity that calculates Reinforced Concrete Members with Flexure 1, be 12kN, Reinforced Concrete Members with Flexure 1 applied to 50% ultimate load, i.e. 6kN.First 1/3 position in Reinforced Concrete Members with Flexure 1 is put and be fixed on to 2 circular shaft loading bars 4, 1 * 7 stainless steel tension of steel strand muscle 2 that is 9.5mm by diameter penetrates the oblique reserved through hole 5 of Reinforced Concrete Members with Flexure 1, and pulling force rib 2 is placed on circular shaft loading bar 4, then use fixedly one end of pulling force rib 2 of latch anchoring piece 3, the other end with centre-hole jack stretch-draw pulling force rib 2, consider because flexural member its Stiffness Deterioration under environment and load coupling causes stress relaxation, as calculated flexural member is carried out 5% super stretch-draw, reality applies 27.5kN load to pulling force rib 2, when stretching force reaches 27.5kN, hold lotus 3 minutes, then the fixing anchoring piece 3 of this one end of stretch-draw, so far, the lasting load of flexural member under normal operating condition just passes to circular shaft loading bar 4 power by being fixed on the pulling force rib 2 of tension on anchoring piece 3 is achieved.
(3) after the lasting load of flexural member applies, member is put into artificial environment simulation box 6, the actual working state of model configuration, as shown in Figure 4.
(4) after reaching design age, from environmental chamber 6, take out flexural member, loading bearing 7 with holes is aimed to circular shaft loading bar 4, on circular shaft loading bar 4, press shown in Fig. 5 and arrange successively and distribute crossbeam 8, power sensor 9, lifting jack 10, finally at reaction frame 11 (reaction frame 11 can be also pressure or universal testing machine), above flexural member is applied to ultimate load, until structural failure.The actual Residual Load Bearing Capacity that records flexural member is 4.5kN, than the bearing capacity of not considering environment and load coupling, reduces by 25%.
Finally, it is also to be noted that, the flexural member described in the present invention comprises Liang Heban.What more than enumerate is only several specific embodiment of the present invention; obviously, the invention is not restricted to above embodiment, can also have many distortion; all distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (9)
1. a charger of simulating continuous load effect of flexural member, it is characterized in that, comprise Reinforced Concrete Members with Flexure (1), pulling force rib (2), anchoring piece (3) and circular shaft loading bar (4), described anchoring piece (3) symmetry is fixed on the two ends of pulling force rib (2), it is upper that circular shaft loading bar (4) is symmetricly set in pulling force rib (2), and the by-level section of described pulling force rib (2) is parallel to the end face of Reinforced Concrete Members with Flexure (1); The lasting load of described Reinforced Concrete Members with Flexure (1) under normal operating condition passes to circular shaft loading bar power by being fixed on the pulling force rib of straining on anchoring piece realizes, and continues load position consistent with circular shaft loading bar position; Described charger comprises loading bearing with holes (7), leaves circular groove in the middle of it; Described loading bearing with holes (7) is aimed at circular shaft loading bar (6), on described circular shaft loading bar (4), arrange successively and distribute crossbeam (8), power sensor (9), lifting jack (10) and reaction frame (11)/pressure testing machine/universal testing machine, described reaction frame (11) or pressure testing machine or universal testing machine are for applying ultimate load to flexural member, until structural failure.
2. the charger as described in claim 1, it is characterized in that, described pulling force rib (2) balanced configuration is in the both sides of Reinforced Concrete Members with Flexure (1), the two ends of pulling force rib (2) use respectively anchoring piece (3) to be anchored in the lower area of flexural member both sides, and the by-level section of described pulling force rib (2) is higher than the end face of Reinforced Concrete Members with Flexure (1).
3. the charger as described in claim 1, it is characterized in that, described pulling force rib (2) balanced configuration is in the both sides of Reinforced Concrete Members with Flexure (1), the two ends of pulling force rib (2) use respectively anchoring piece (3) to be anchored in the lower area of flexural member both sides, and the by-level section of described pulling force rib (2) is lower than the end face of Reinforced Concrete Members with Flexure (1).
4. the charger as described in claim 1, it is characterized in that, the oblique symmetry in both sides of described Reinforced Concrete Members with Flexure (1) offers oblique reserved through hole (5), the aperture of described reserved through hole (5) is greater than the diameter of pulling force rib (2), one end outlet in hole is on the end face of Reinforced Concrete Members with Flexure (1), other end outlet is in the lower position of Reinforced Concrete Members with Flexure (1) side, both ends, the by-level section of described pulling force rib (2) is higher than the end face of Reinforced Concrete Members with Flexure (1), the two ends of pulling force rib (2) are anchored at the lower area of side, flexural member both ends through reserved through hole (5).
5. the charger as described in claim 2 or 3 or 4, is characterized in that, between described Reinforced Concrete Members with Flexure (1) and circular shaft loading bar (4), is provided with circular groove keeper (12).
6. the charger as described in claim 2 or 3 or 4, it is characterized in that, described Reinforced Concrete Members with Flexure (1) offers the circular groove that same circular shaft loading bar (4) diameter is identical or is embedded with ironware corresponding to the riding position of circular shaft loading bar (4).
7. the charger as described in claim 1 or 2 or 3 or 4, is characterized in that, described anchoring piece (3) is latch or bolt or weldment.
8. the charger as described in claim 1 or 2 or 3 or 4, is characterized in that, described pulling force rib (2) is stainless steel steel strand wires or the antiseptic high-durability steel wire of process or the antiseptic steel strand wires of process.
9. the charger as described in claim 1 or 2 or 3 or 4, is characterized in that, described circular shaft loading bar (4) is stainless steel or the antiseptic high-durability steel wire of process or the antiseptic steel strand wires of process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110363175.5A CN102494945B (en) | 2011-11-16 | 2011-11-16 | Test apparatus for endurance of flexural member under load-environment coupling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110363175.5A CN102494945B (en) | 2011-11-16 | 2011-11-16 | Test apparatus for endurance of flexural member under load-environment coupling |
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| CN102494945A CN102494945A (en) | 2012-06-13 |
| CN102494945B true CN102494945B (en) | 2014-08-13 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107367377B (en) * | 2017-07-14 | 2019-04-02 | 西安建筑科技大学 | Reinforced Concrete Members with Flexure bearing capacity evaluation method based on sound emission Ring-down count |
| CN111089779A (en) * | 2020-01-13 | 2020-05-01 | 中国矿业大学(北京) | Truss anchor cable anchoring performance testing device and using method |
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| CN101275892A (en) * | 2008-03-04 | 2008-10-01 | 东南大学 | Concrete multi-factors durability experimental device under bent tension stress and environment coupled action |
| CN101650285A (en) * | 2009-09-22 | 2010-02-17 | 同济大学 | Fatigue bending machine for concrete material |
| CN201698622U (en) * | 2009-12-14 | 2011-01-05 | 林奇 | External prestressing experiment device |
| CN102169068A (en) * | 2010-12-31 | 2011-08-31 | 扬州大学 | Loading method for concrete member flexural test |
| CN202330164U (en) * | 2011-11-16 | 2012-07-11 | 浙江建设职业技术学院 | Loading device of continuous load effect of flexural member |
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2011
- 2011-11-16 CN CN201110363175.5A patent/CN102494945B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101275892A (en) * | 2008-03-04 | 2008-10-01 | 东南大学 | Concrete multi-factors durability experimental device under bent tension stress and environment coupled action |
| CN101650285A (en) * | 2009-09-22 | 2010-02-17 | 同济大学 | Fatigue bending machine for concrete material |
| CN201698622U (en) * | 2009-12-14 | 2011-01-05 | 林奇 | External prestressing experiment device |
| CN102169068A (en) * | 2010-12-31 | 2011-08-31 | 扬州大学 | Loading method for concrete member flexural test |
| CN202330164U (en) * | 2011-11-16 | 2012-07-11 | 浙江建设职业技术学院 | Loading device of continuous load effect of flexural member |
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