CN107179251B - A kind of girder steel constraint torsion experimental rig - Google Patents
A kind of girder steel constraint torsion experimental rig Download PDFInfo
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- CN107179251B CN107179251B CN201710437050.XA CN201710437050A CN107179251B CN 107179251 B CN107179251 B CN 107179251B CN 201710437050 A CN201710437050 A CN 201710437050A CN 107179251 B CN107179251 B CN 107179251B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/26—Investigating twisting or coiling properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
It include loading frame, torsion cylinder, hollow plunger synchronous hydra-ulic jacks, folder support and wirerope the invention discloses a kind of girder steel constraint torsion experimental rig, the both ends of the loading frame are respectively equipped with folder support, folder support is fixed on pedestal, the loading frame is equipped with hollow plunger synchronous hydra-ulic jacks, torsion cylinder is equipped in loading frame, reverse the fixture that fixed test beam is equipped in cylinder, wherein test beam passes through torsion cylinder and it is fixed by the fixture of test beam, and the both ends of test beam have folder support to be fixed.Rationally, lineoutofservice signal pull direction is tangent with torsion cylinder always in the present invention, and the lineoutofservice signal pull of the left and right sides is equal in magnitude contrary for the configuration of the present invention is simple, design, is subjected only to torque effect so as to guarantee test beam.
Description
Technical field
The present invention relates to a kind of girder steel constraint torsion experimental rigs, belong to steel structure technology field.
Background technique
Torsion is as one of five kinds of basic stresses, is especially to need weight in Bridge Design in the design of girder steel
What point considered.When the shearing acted on beam does not pass through the centre of shear, beam will twist around the centre of shear.Torsional deflection can
It is divided into FREE TORSION and constraint torsion, the stress state of the two is widely different.When reversing generation except the component of circular cross-section is cut
Face is kept outside plane, other section forms make surface irregularity since each fiber on section generates displacement along longitudinal direction, is cut
Face is no longer held at plane, generates buckling deformation.If the displacement of each fiber along longitudinal direction is unfettered, for FREE TORSION, only
Free torsional shearing stress is generated, and the change rate of torsion angle is constant.When component twist deform when, one or both ends
Buckling deformation suffer restraints the limitation of condition, then the deformation in other sections is also by by different degrees of effect of contraction, this
When test specimen occur then be constrained twisting deformability.The buckling deformation in section will generate lonitudinal warping direct stress after suffering restraints, and
Supervene warping shear stress；The change rate of torsion angle is also no longer constant.As can be seen that the torsional deflection of beam is complex,
Therefore, research is carried out to mechanical property of the girder steel under torque effect to be very important.
However, at present girder steel by torsional test, be all made of test beam both ends apply opposite torques tested, this belongs to
The scope of FREE TORSION.For constraint torsion, it is desirable that each section when reversing component by support conditions or external force mode
Buckling deformation suffer restraints.
When the shearing acted on beam does not pass through the centre of shear, beam will twist around the centre of shear.Torsional deflection can
It is divided into FREE TORSION and constraint torsion, the stress state of the two is widely different, and it is significant to carry out torsion test to beam.However,
Current crane torsion test device is FREE TORSION device.
Summary of the invention
It is an object of the invention to: a kind of girder steel constraint torsion experimental rig is provided, sticking up for each section of test beam can be made
Song deformation is brought it about constrained twisting deformability by different degrees of constraint, to generate lonitudinal warping direct stress, and with production
Raw warping shear stress.
The technical scheme adopted by the invention is that: a kind of girder steel constraint torsion experimental rig, including loading frame, torsion circle
Cylinder, hollow plunger synchronous hydra-ulic jacks, folder support and wirerope, the both ends of the loading frame are respectively equipped with folder support, press from both sides
Support is fixed on pedestal, and the loading frame is equipped with hollow plunger synchronous hydra-ulic jacks, and torsion circle is equipped in loading frame
Cylinder, the interior fixture for being equipped with fixed test beam of torsion cylinder, wherein test beam passes through torsion cylinder and by the fixture of test beam to it
It is fixed, the both ends of test beam have folder support to be fixed.
In the present invention: the loading frame includes two columns and upper and lower reaction beam, is equipped between two columns
Upper and lower reaction beam, the torsion cylinder are fixed on the position between upper and lower reaction beam, wherein the column is by steel pipe structure
At the reaction beam is welded by two blocks of steel plates one and is further applied load for hollow plunger synchronous hydra-ulic jacks.
In the present invention: the folder support includes two pillars and upper and lower support rod, and upper and lower branch is equipped between two pillars
Strut, the upper and lower support rod told are welded by two round steel pipes, two, two blocks of smooth round steel of steel plate two and.
In the present invention: the torsion cylinder includes two concentric radius not equal two cylinders i.e. inner barrel and outer barrel,
By floor welding of putting more energy between inner barrel and outer barrel, the upper and lower cylinder face of the outer cylinder is welded with the round steel of fixed wirerope
The forward and backward nozzle of Guan Yi, the outer cylinder are equipped with annulus；The fixture of fixed test beam is equipped in the inner cylinder, it is described solid
The fixture for determining test beam is made of six roots of sensation high-strength bolt bar with plate.
In the present invention: the wirerope extends along a tangential direction around outer cylinder, with a fixed wirerope transverse direction position
The slab set forms the slab pedestal for placing hollow plunger synchronous hydra-ulic jacks, the hollow plunger synchronous hydra-ulic jacks
It is placed between reaction beam and slab pedestal, the slab pedestal is equipped with the corresponding notch of fixed wirerope.
Beneficial effects of the present invention:
1, rationally, lineoutofservice signal pull direction is tangent with torsion cylinder always in the present invention for the configuration of the present invention is simple, design,
And the lineoutofservice signal pull of the left and right sides is equal in magnitude contrary, is subjected only to torque effect so as to guarantee test beam；
2, the corner of test beam span centre of the invention is zero, i.e. warpage does not occur for section, it is ensured that reverses turning for cylinder
Dynamic stationarity, and the safety of stretch-draw jack can be improved；
3, the present invention can effective limit assay beam both ends rotational freedom, make test beam from end section to each section intermediate
The deformation in face is by different degrees of constraint, to make test beam that constrained twisting deformability occur.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is that schematic diagram of the cylinder in conjunction with loading frame is reversed in the present invention；
Fig. 3 is the structural schematic diagram that support is pressed from both sides in the present invention；
Fig. 4 is the decomposition diagram that support is pressed from both sides in the present invention；
Fig. 5 is the structural schematic diagram that cylinder is reversed in the present invention；
Fig. 6 is the structural schematic diagram of support rod in the present invention；
Fig. 7 is the combination schematic diagram that cylinder and wirerope are reversed in the present invention；
Fig. 8 is test result figure of the invention.
Wherein: 1. loading frames；2. reversing cylinder；3. hollow plunger synchronous hydra-ulic jacks；4. pressing from both sides support；5. wirerope；
6. pedestal；7. column；8. reaction beam；9. steel plate one；10. steel pipe；11. inner cylinder；12. outer cylinder；13. annulus；14. floor of putting more energy into；
15. round steel pipe one；16. shank of bolt；17. plate；18. steel plate two；19. round steel；20. round steel pipe two；21. slab pedestal；22.
Column；23. support rod；24. test beam.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments.
As shown in figs. 1-7, a kind of girder steel constraint torsion experimental rig, including loading frame 1, torsion cylinder 2, hollow plunger are same
Stepped hydraulic jack 3, folder support 4 and wirerope 5, the both ends of the loading frame 1 are respectively equipped with folder support 4, and folder support 4 is fixed
On pedestal 6, hollow plunger synchronous hydra-ulic jacks 3, loading frame 2 are equipped on the upper and lower reaction beam 8 of the loading frame 1
Upper and lower reaction beam 8 between be equipped with torsion cylinder 2, the fixture of fixed test beam 24 is equipped in torsion cylinder 2, wherein test beam
24 pass through torsion cylinder 2 and it are fixed by the fixture of test beam, and 24 both ends of test beam have folder support 4 to be consolidated
It is fixed.
The loading frame 1 includes two columns 7 and upper and lower reaction beam 8, is equipped with upper and lower counter-force between two columns 7
Beam 8, the torsion cylinder 2 are fixed on the position between upper and lower reaction beam 8, wherein the column 7 is made of steel pipe 10,
The reaction beam 8 is welded by two blocks of steel plates 1 and is further applied load for hollow plunger synchronous hydra-ulic jacks 3；The folder
Support 4 includes two pillars 22 and upper and lower support rod 23, is equipped with upper and lower support rod 23, the upper and lower branch told between two pillars 22
Strut 23 is welded by two round steel pipes, 2 20, two blocks of steel plates 2 18 and a smooth round steel 19.The torsion circle
Cylinder 2 includes the two cylinder, that is, inner cylinders 11 and outer cylinder 12 that two concentric radius do not wait, by putting more energy between inner cylinder 11 and outer cylinder 12
Floor 14 welds, and the upper and lower cylinder face of the outer cylinder 12 is welded with the round steel pipe 1 of fixed wirerope 5, the outer cylinder
12 forward and backward nozzle is equipped with annulus 13；The fixture of fixed test beam 24, the fixed test beam are equipped in the inner cylinder 11
24 fixture is made of six roots of sensation high-strength bolt bar 16 with plate 17；The wirerope 5 prolongs along a tangential direction around outer cylinder 12
It stretches, forms the slab pedestal for placing hollow plunger synchronous hydra-ulic jacks 3 with the slab of 5 lateral position of fixed wirerope
21, the hollow plunger synchronous hydra-ulic jacks 3 are placed between reaction beam 8 and slab pedestal 21, the slab pedestal
21 are equipped with the corresponding notch of fixed wirerope 5, and notch can fix wirerope 5.
When specific test, torsion cylinder 2 is clamped to the outer rim of test beam 24 by fixture, the both ends of test beam 24 are by folder branch
Seat 4 is fixed on pedestal 6, and hollow plunger synchronous hydra-ulic jacks 3 are placed between reaction beam 8 and slab pedestal 21, are fixed
Wirerope 5.When test beam 24, which twists, to be deformed, since wirerope 5 is tangent with torsion cylinder 2 always, examination can guarantee
It tests front and back test beam 24 and is subjected only to torque effect.The lifting of hollow plunger synchronous hydra-ulic jacks 3 applies pulling force, steel to wirerope 5
5 direction of pull of cord is tangent with the outer cylinder 12 of torsion cylinder 2 always, and torsion cylinder 2 will be rotated around itself center of circle, to drive examination
It tests beam 24 also to twist deformation, presss from both sides limitation of the support 4 to 24 end freedom degree of test beam by both ends, it is each among test beam 24
The displacement of section along longitudinal direction, which suffers restraints the buckling deformation by different degrees of effect of contraction, section, will generate lonitudinal warping
Direct stress.
Fig. 8 is the preliminary identification of this experimental rig reliability.Studies have shown that by folder support 4 to 24 both ends of test beam
Rotational freedom limitation, the displacement of the 24 each section in centre of test beam along longitudinal direction have been actually subjected to different degrees of constraint, test beam
24 happens is that constrained twisting deformability.
Above specific embodiments of the present invention have been described, but the present invention is not limited to above description.For this
For the technical staff in field, the equal modification and substitution of any pair of the technical program are all within the scope of the invention.Cause
This, made equal transformation and modification, all should be contained within the scope of the invention without departing from the spirit and scope of the invention.
Claims (3)
1. a kind of girder steel constraint torsion experimental rig, it is characterised in that: including loading frame, torsion cylinder, the synchronous liquid of hollow plunger
Jack, folder support and wirerope are pressed, the both ends of the loading frame are respectively equipped with folder support, and folder support is fixed on pedestal,
The loading frame is equipped with hollow plunger synchronous hydra-ulic jacks, and torsion cylinder is equipped in loading frame, reverses and is equipped in cylinder
The fixture of fixed test beam, wherein test beam passes through torsion cylinder and it is fixed by the fixture of test beam, test beam
Both ends have folder support to be fixed；
The torsion cylinder includes two concentric radius not equal two cylinders i.e. inner barrel and outer barrel, is led between inner barrel and outer barrel
Floor welding of putting more energy into is crossed, the upper and lower cylinder face of the outer cylinder is welded with the round steel pipe one of fixed wirerope, the outer cylinder
Forward and backward nozzle is equipped with annulus；The fixture of fixed test beam is equipped in the inner cylinder, the fixture of the fixed test beam is by six
Root high-strength bolt bar and plate form；
The wirerope extends along a tangential direction around outer cylinder, is formed and is placed with the slab of a fixed wirerope lateral position
The slab pedestal of hollow plunger synchronous hydra-ulic jacks, the hollow plunger synchronous hydra-ulic jacks are placed on reaction beam and thickness
Between board bottom seat, the slab pedestal is equipped with the corresponding notch of fixed wirerope.
2. a kind of girder steel constraint torsion experimental rig according to claim 1, it is characterised in that: the loading frame includes
Two columns and upper and lower reaction beam, upper and lower reaction beam is equipped between two columns, and the torsion cylinder is fixed on above and below
Position between reaction beam, wherein the column is made of steel pipe, the reaction beam is welded confession by two blocks of steel plates one
Hollow plunger synchronous hydra-ulic jacks are further applied load.
3. a kind of girder steel constraint torsion experimental rig according to claim 1, it is characterised in that: the folder support includes
Two pillars and upper and lower support rod are equipped with upper and lower support rod between two pillars, and the upper and lower support rod is by two round steel
Two, two blocks of smooth round steel of steel plate two and of pipe are welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710437050.XA CN107179251B (en) | 2017-06-12 | 2017-06-12 | A kind of girder steel constraint torsion experimental rig |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710437050.XA CN107179251B (en) | 2017-06-12 | 2017-06-12 | A kind of girder steel constraint torsion experimental rig |
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| CN107179251A CN107179251A (en) | 2017-09-19 |
| CN107179251B true CN107179251B (en) | 2019-05-28 |
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| CN112213209B (en) * | 2020-10-12 | 2022-09-09 | 南通理工学院 | Torsion resistance test device for reinforced concrete member |
| CN112525726B (en) * | 2020-11-23 | 2022-03-11 | 东南大学 | Torsion test stand |
| CN114184495B (en) * | 2021-12-09 | 2024-01-26 | 中国船舶科学研究中心 | Ship equivalent Liang Lingmin degree coefficient calibration fixing device and determination method |
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| US6575042B1 (en) * | 2002-02-13 | 2003-06-10 | Beere Precision Medical Instruments, Inc. | Beam-type torsion applying and measuring tool |
| SK852012U1 (en) * | 2012-06-18 | 2012-10-02 | Slovenska Technicka Univerzita V Bratislave | Universal device for measuring the effects of torsion beams |
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