CN203965265U - A kind of electromagnetic type suspension cable fatigue tester - Google Patents
A kind of electromagnetic type suspension cable fatigue tester Download PDFInfo
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- CN203965265U CN203965265U CN201420284431.0U CN201420284431U CN203965265U CN 203965265 U CN203965265 U CN 203965265U CN 201420284431 U CN201420284431 U CN 201420284431U CN 203965265 U CN203965265 U CN 203965265U
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- suspension cable
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Abstract
The utility model discloses a kind of electromagnetic type suspension cable fatigue tester, for the testing fatigue of suspension cable test specimen, comprise base, magnetic vibration mechanism, elasticity force transmission mechanism and for the first horizontal fixed support, the second horizontal fixed support at anchoring suspension cable test specimen two ends; Described magnetic vibration mechanism comprises electromagnet, vibrator bar, coil, and one end of vibrator bar is arranged on base, and the other end is placed in through coil rear overhang the magnetic field center that electromagnet produces, and coil is connected with the power supply of generation exchange current; Elasticity force transmission mechanism is arranged between suspension cable test specimen and vibrator bar.Therefore, the utility model, by moved reciprocatingly in magnetic field by the magnetized vibrator bar of exchange current, makes suspension cable test specimen cyclic loading, causes the fatigue effect of suspension cable.The contact area that changes size of current and change vibrator bar and magnetic field, can simulate the torture test under different stress amplitude effects; Change the longitudinal space of suspension cable, can simulate the suspension cable test specimen of different length.
Description
Technical field
The utility model relates to a kind of electromagnetic type suspension cable fatigue tester, belongs to structural test field.
Background technology
In recent years, due to building in a large number and the continuous increase of span of cable-stayed bridge, the length of suspension cable also continues to increase thereupon.Due to the flexible characteristic of suspension cable and to environmental load (for example: violent typhoon, traffic load, response, will cause the high vibration of suspension cable and cause corresponding fatigue damage.According to U.S. civil engineering work association (ASCE, statistics, 80% ~ 90% steel construction destroys relevant with fatigue damage.Therefore, fatigue damage research of suspension cable is had great importance.
For suspension cable fatigue study under constant amplitude load effect, we can utilize the S-N curve of material to estimate and under different stress levels, arrive the cycle index that destruction is experienced.Yet, for CYCLIC LOADING under two or more stress levels, just cannot directly with S-N curve, estimate its life-span, also must be by means of Cumulative Fatigue Damage criterion, but the research for Cumulative Fatigue Damage has continued many decades, fail so far to draw a gratifying unified model.And actual suspension cable is often in complicated applied force state, therefore still need by great many of experiments research suspension cable fatigue damage rule.
At present for suspension cable fatigue experiment research, mainly based on real bridge health monitoring systems, but because health monitoring systems lays particular emphasis on the security of integral bridge configuration state, influence factor is more, can not carry out single factor analysis.Therefore can not effectively carry out the fatigue study of suspension cable.
Based on above situation, be necessary to propose a kind of novel indoor suspension cable fatigue tester.
Utility model content
Utility model object: the utility model, for the key member suspension cable in cable-stayed bridge, provides a kind of electromagnetic type suspension cable fatigue tester.
Technical scheme: for solving the problems of the technologies described above, suspension cable fatigue tester of the present utility model adopts following technical scheme:
An electromagnetic type suspension cable fatigue tester, for the testing fatigue of suspension cable test specimen, comprises base, test specimen fixed mechanism, magnetic vibration mechanism, elasticity force transmission mechanism; Described test specimen fixed mechanism comprises two groups of fixed supports of laterally placing, is respectively the first horizontal fixed support, the second horizontal fixed support, and the two ends of suspension cable test specimen are respectively by ground tackle and the first horizontal fixed support, the second horizontal fixed support anchoring; Described magnetic vibration mechanism comprises electromagnet, vibrator bar, coil, and one end of vibrator bar is arranged on base, and the other end is placed in through coil rear overhang the magnetic field center that electromagnet produces, and described coil is connected with the power supply of generation exchange current; Described elasticity force transmission mechanism comprises the first power transmission spring, the second power transmission spring, connecting electronic dynamometer between this first power transmission spring, the second power transmission spring, and the first power transmission spring is connected with suspension cable test specimen, the second power transmission spring is connected with vibrator bar, and the elastic telescopic direction of the first power transmission spring, the second power transmission spring is consistent with the length direction of suspension cable test specimen simultaneously.
As further improvement of the utility model, the described in the utility model first horizontal fixed support comprises a shaped steel frame, this shaped steel frame comprises crossbeam and two door pillars that are connected with crossbeam two ends respectively, the end of every door pillar is all by sliding wheel mechanism and removable a connection of longitudinal rail, described sliding wheel mechanism comprises that matrix and compartment of terrain are arranged on the pulley of the block surface of matrix, and the both ends of the surface that described matrix is adjacent with longitudinal rail edge are fitted with respectively fixed block, the position of the corresponding fixed block of longitudinal rail arranges fixed block hole, described fixed block hole at least arranges one on the bearing of trend of longitudinal rail.
As further improvement of the utility model, on the crossbeam of door shaped steel frame described in the utility model, offer row's test specimen hole, and hole is offered in the test specimen hole of offering on the crossbeam of the second horizontal fixed support corresponding to door shaped steel frame; The two ends of described suspension cable test specimen respectively with the crossbeam of door shaped steel frame on hole on corresponding test specimen hole and the second horizontal fixed support pass through ground tackle anchoring.
As further improvement of the utility model, vibrator bar involving vibrations silver described in the utility model, this vibration silver is offered more than one spring hole along himself bearing of trend; Described the second power transmission spring connects with corresponding spring hole.
As further improvement of the utility model, vibrator bar described in the utility model is connected with base by horizontal mobile device, this horizontal mobile device comprises cross slide way, transverse shifting piece and the screw rod being arranged on base, the laying direction of described cross slide way is consistent with the bearing of trend of vibrator bar, and cross slide way is offered row's screw rod fixed orifice along its middle part; Described vibrator bar is arranged on transverse shifting piece by bolt assembly, and transverse shifting piece is slidably connected with cross slide way; One end of screw rod is connected with vibrator bar threaded engagement, the other end through after transverse shifting piece with cross slide way on the locking of respective threaded rod fixed orifice.
As further improvement of the utility model, electromagnet described in the utility model is communicated with electric current by wire.
According to above technical scheme, with respect to prior art, the utlity model has following advantage:
One, can simulate the suspension cable test specimen of different length, by changing the length travel of longitudinal moving device, regulate the fixedly distance of ground tackle of suspension cable two ends, to simulate the suspension cable test specimen of different size.Two, there is multiple stress regulative mode, on the one hand can be by changing the size of current at electromagnet two ends, make change of magnetic field strength, and then the stressed change of vibrating reed, finally make the stress amplitude that suspension cable bears change, can, by changing the transversal displacement of horizontal mobile device, be subject to the contact area in magnetized vibrator bar and magnetic field on the other hand, make the whole stressed change of vibrating reed, thereby regulate stress amplitude;
Hence one can see that, and the utility model, by moved reciprocatingly in magnetic field by the magnetized vibrator bar of exchange current, makes suspension cable test specimen cyclic loading, causes the fatigue effect of suspension cable.The contact area that changes size of current and change vibrator bar and magnetic field, can simulate the torture test under different stress amplitude effects; Change the longitudinal space of suspension cable, can simulate the suspension cable test specimen of different length.For suspension cable Fatigue Test Research provides new method.
Accompanying drawing explanation
Fig. 1 is the utility model electromagnetic type suspension cable fatigue tester vertical view;
Fig. 2 is the partial schematic diagram of the utility model electromagnetic type suspension cable fatigue tester vibrator bar;
Fig. 3 is the utility model electromagnetic type suspension cable fatigue tester side view;
Fig. 4 a is the structural representation of door shaped steel frame described in the utility model; Fig. 4 b is the partial schematic diagram of longitudinal rail;
Fig. 5 a is the structural representation of cross slide way described in the utility model; Fig. 5 b is for vibrator bar is fixed on to the structural representation of the screw rod on guide rail by transverse shifting piece;
In Fig. 1,1, electromagnet; 2, vibrator bar; 3, the first horizontal fixed support; 4, the second horizontal fixed support; 5, the first power transmission spring; 6, electronic dynamometer; 7, the second power transmission spring; 8, wire; 9, suspension cable test specimen; 10, strainometer; 11, ground tackle;
In Fig. 2,2a, vibration silver; 2a, spring hole;
In Fig. 3,12, transverse shifting piece; 13, bolt; 14, screw rod; 15, coil; 16, electrode; 17, exchange current; 18, guide rail mechanism; 19, base;
In Fig. 4 a, 4b, 4a, longitudinal rail; 4b, fixed block hole; 4c, fixed block; 4d, pulley; 4e, test specimen hole; 4f, door shaped steel frame; 4g, matrix;
In Fig. 5 a, 5b, 18a, cross slide way; 18b; Screw rod fixed orifice.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment and only for the utility model is described, be not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present utility model.
As shown in Figure 1,3, the core of this fatigue tester mainly comprises electromagnet 1, vibrator bar 13, coil 15, electrode 16, exchange current 17, the first power transmission spring 5; Electronic dynamometer 6, the second power transmission spring 7.Its principle is to be subject to magnetized vibrator bar 13 under electromagnet 1 magnetic fields that produces, vibrator bar double vibrations.Because a section of vibrator bar is provided with coil 15, in coil, pass into exchange current 17, and each cycle of the direction of current of exchange current will change twice, magnetic pole after causing vibrator bar to be magnetized will change, therefore electromagnet also will change to the direction of its acting force, cause and be connected to spring 4 cyclic loadings on vibrator bar thus, spring the most at last ringing power is passed to suspension cable.The size of current that changes input electromagnet, can change the magnetic field intensity in vibrating reed environment of living in, makes the stressed change of vibrating reed, thereby Oscillation Amplitude changes, and finally causes the suffered stress amplitude of test specimen to change.
Described elasticity force transmission mechanism comprises the first power transmission spring, the second power transmission spring, connecting electronic dynamometer between this first power transmission spring, the second power transmission spring, and the first power transmission spring is connected with suspension cable test specimen, the second power transmission spring is connected with vibrator bar, the elastic telescopic direction of the first power transmission spring, the second power transmission spring is consistent with the length direction of suspension cable test specimen simultaneously, the ringing power that vibrator bar produces, first reach the first power transmission spring, through electronic dynamometer, reach the second power transmission spring.Due to suspension cable be flexible structure, when carrying out torture test, need to apply an initial pretension, different torture test needs the initial pretensions of different sizes, the large I of pretension is reflected by electronic dynamometer.
As shown in Figure 1, torture test motor spindle mainly consists of base 19 and guide rail mechanism 18, guide rail mechanism comprises cross slide way 18a, transverse shifting piece 12 is set on it, and by utilizing bolt 13 that vibrator bar is fixed on transverse shifting piece, when transverse shifting piece is moved, the contact area that causes vibrator bar and electromagnet is changed, thereby the Oscillation Amplitude of vibrator bar changes, finally cause the suffered stress amplitude of test specimen to change.In order to guarantee the stability of fatigue tester in experimentation, after stress amplitude regulates, need fixed lateral movable block, therefore at the middle part of cross slide way, be provided with the screw rod fixed orifice of some, as shown in Fig. 5 a, 5b, by up and down all threaded screw rod 14 be threaded with the arbitrary screw rod fixed orifice on vibrator bar, cross slide way respectively, transverse shifting piece is fixed on to a certain position of cross slide way.
As shown in Figure 2, vibrator bar is mainly comprised of vibration silver and spring hole, when transverse shifting piece is moved, the movement of power transmission spring and vibrator bar will be driven, therefore on vibration silver 2a, be provided with the spring hole of some, during specific experiment, first according to the displacement of transverse shifting piece, select after suitable spring hole, then the second spring end is passed to spring hole 2b, finally by fixture, the second spring is connected with vibrator bar, makes power transmission smooth and easy.
As shown in Fig. 4 a, 4b, longitudinal moving device mainly comprises longitudinal rail 4a, fixed block hole 4b, fixed block 4c, pulley 4d, test specimen hole 4e, door shaped steel frame 4f, matrix 4g.Suspension cable test specimen is fixed between the first horizontal fixed support 3 and the second horizontal fixed support 4 by ground tackle 11.Door shaped steel frame bottom is connected with matrix, and integrated respectively pulley and fixed block on matrix arrange guide rail bottom pulley, and be provided with respectively fixed block hole at two side rails edges.Pulley can move freely along guide rail prolonging direction on the one hand, regulates the longitudinal space of fatigue tester, meets the suspension cable test specimen of different length; After regulating on the other hand, the fixed block on matrix is fallen into corresponding fixed block hole, make the translational degree of freedom constraint of both direction, can reach fixing effect.Meanwhile, when transverse shifting piece is moved, also will drive the movement of test specimen, therefore the test specimen hole of some will be set respectively at the first horizontal fixed support 3 and the second horizontal fixed support 4.
Claims (6)
1. an electromagnetic type suspension cable fatigue tester, the testing fatigue for suspension cable test specimen, is characterized in that, comprises base, test specimen fixed mechanism, magnetic vibration mechanism, elasticity force transmission mechanism; Described test specimen fixed mechanism comprises two groups of fixed supports of laterally placing, is respectively the first horizontal fixed support, the second horizontal fixed support, and the two ends of suspension cable test specimen are respectively by ground tackle and the first horizontal fixed support, the second horizontal fixed support anchoring; Described magnetic vibration mechanism comprises electromagnet, vibrator bar, coil, and one end of vibrator bar is arranged on base, and the other end is placed in through coil rear overhang the magnetic field center that electromagnet produces, and described coil is connected with the power supply of generation exchange current; Described elasticity force transmission mechanism comprises the first power transmission spring, the second power transmission spring, connecting electronic dynamometer between this first power transmission spring, the second power transmission spring, and the first power transmission spring is connected with suspension cable test specimen, the second power transmission spring is connected with vibrator bar, and the elastic telescopic direction of the first power transmission spring, the second power transmission spring is consistent with the length direction of suspension cable test specimen simultaneously.
2. electromagnetic type suspension cable fatigue tester according to claim 1, it is characterized in that, the described first horizontal fixed support comprises a shaped steel frame, this shaped steel frame comprises crossbeam and two door pillars that are connected with crossbeam two ends respectively, the end of every door pillar is all by sliding wheel mechanism and removable a connection of longitudinal rail, described sliding wheel mechanism comprises that matrix and compartment of terrain are arranged on the pulley of the block surface of matrix, and the both ends of the surface that described matrix is adjacent with longitudinal rail edge are fitted with respectively fixed block, the position of the corresponding fixed block of longitudinal rail arranges fixed block hole, described fixed block hole at least arranges one on the bearing of trend of longitudinal rail.
3. electromagnetic type suspension cable fatigue tester according to claim 2, is characterized in that, offer row's test specimen hole, and hole is offered in the test specimen hole of offering on the crossbeam of the second horizontal fixed support corresponding to door shaped steel frame on the crossbeam of described door shaped steel frame; The two ends of described suspension cable test specimen respectively with the crossbeam of door shaped steel frame on hole on corresponding test specimen hole and the second horizontal fixed support pass through ground tackle anchoring.
4. electromagnetic type suspension cable fatigue tester according to claim 1, is characterized in that, described vibrator bar involving vibrations silver, and this vibration silver is offered more than one spring hole along himself bearing of trend; Described the second power transmission spring connects with corresponding spring hole.
5. electromagnetic type suspension cable fatigue tester according to claim 1, it is characterized in that, described vibrator bar is connected with base by horizontal mobile device, this horizontal mobile device comprises cross slide way, transverse shifting piece and the screw rod being arranged on base, the laying direction of described cross slide way is consistent with the bearing of trend of vibrator bar, and cross slide way is offered row's screw rod fixed orifice along its middle part; Described vibrator bar is arranged on transverse shifting piece by bolt assembly, and transverse shifting piece is slidably connected with cross slide way; One end of screw rod is connected with vibrator bar threaded engagement, the other end through after transverse shifting piece with cross slide way on the locking of respective threaded rod fixed orifice.
6. electromagnetic type suspension cable fatigue tester according to claim 1, is characterized in that, described electromagnet is communicated with electric current by wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420284431.0U CN203965265U (en) | 2014-05-29 | 2014-05-29 | A kind of electromagnetic type suspension cable fatigue tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420284431.0U CN203965265U (en) | 2014-05-29 | 2014-05-29 | A kind of electromagnetic type suspension cable fatigue tester |
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| Publication Number | Publication Date |
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| CN203965265U true CN203965265U (en) | 2014-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420284431.0U Withdrawn - After Issue CN203965265U (en) | 2014-05-29 | 2014-05-29 | A kind of electromagnetic type suspension cable fatigue tester |
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| Country | Link |
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| CN (1) | CN203965265U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034616A (en) * | 2014-05-29 | 2014-09-10 | 河海大学 | Electromagnetic type stay cable fatigue tester |
| CN104990820A (en) * | 2015-07-01 | 2015-10-21 | 河海大学 | Electromagnetic multiaxial fatigue testing machine |
| CN108918139A (en) * | 2018-07-19 | 2018-11-30 | 中国人民解放军陆军装甲兵学院 | Dynamic load loading device with safety protection function |
-
2014
- 2014-05-29 CN CN201420284431.0U patent/CN203965265U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034616A (en) * | 2014-05-29 | 2014-09-10 | 河海大学 | Electromagnetic type stay cable fatigue tester |
| CN104034616B (en) * | 2014-05-29 | 2016-07-06 | 河海大学 | A kind of electromagnetic type suspension cable fatigue machine |
| CN104990820A (en) * | 2015-07-01 | 2015-10-21 | 河海大学 | Electromagnetic multiaxial fatigue testing machine |
| CN104990820B (en) * | 2015-07-01 | 2017-07-18 | 河海大学 | Electromagnetic type multiaxle fatigue experimental machine |
| CN108918139A (en) * | 2018-07-19 | 2018-11-30 | 中国人民解放军陆军装甲兵学院 | Dynamic load loading device with safety protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141126 Effective date of abandoning: 20160706 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |