CN105466758A - A loading device capable of eliminating influences of friction and controlling column axial force and a method - Google Patents
A loading device capable of eliminating influences of friction and controlling column axial force and a method Download PDFInfo
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- CN105466758A CN105466758A CN201510795909.5A CN201510795909A CN105466758A CN 105466758 A CN105466758 A CN 105466758A CN 201510795909 A CN201510795909 A CN 201510795909A CN 105466758 A CN105466758 A CN 105466758A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The objective of the invention is to provide a loading device capable of eliminating influences of friction and controlling column axial force and a method so as to overcome problems in the prior art that friction influences result accuracy and column axial force cannot be constant and to make measured results more accurate. When earthquake resistant behaviors of a beam column assemblage and a frame column are tested, and by obtaining a relation curve of column-top horizontal force and horizontal displacement (P-delta) and nonlinear deformation conditions of a joint area through a manner of applying a low-frequency cyclic load to a column top, relations of the beam column assemblage and overall and local deformation of the frame column to horizontal force are more accurate.
Description
Technical field
The present invention relates to the Study on behavior of beam-column subassemblage and frame column, specifically one can be eliminated frictional influence and can carry out controlled loading device to column axial force.
Background technology
Bean column node, frame column are all significant points of stress performance complexity in reinforced concrete structure, and particularly in seismic process, its anti-seismic performance plays vital effect to integrally-built anti-seismic performance.The domestic and international research to beam-column subassemblage, frame column stress performance at present mainly concentrates on experimental research and numerical simulation two aspects, and the accuracy of experimental study plays irreplaceable effect to the force-mechanism of understanding bean column node, frame column and hysteresis response feature etc.For the Experimental Study on Seismic Behavior of beam-column subassemblage, frame column, be typically employed in capital and apply the nonlinear deformation situation that the method (being called styletable load test) of low cycle repetitive load obtains capital horizontal force and horizontal shift (P-Δ) relation curve and node area, to study the distortion of whole and part of beam-column subassemblage, frame column.In addition, beam-column subassemblage test, frame column all need the impact considering that axle power is reacted its hysteresis, therefore need coupled columns to apply a constant shaft power in test.
The beam-column subassemblage test loaded for styletable is described this problem.The main beam-column subassemblage test unit that there are two class styletables and load both at home and abroad, but all there is certain error in these two kinds of test units.
The advantage of first kind test unit is, by the control to hydraulic jack or vertical actuator in process of the test, experimenter artificially can adjust the size of column axial force, can adjust in time when axle power changes, with ensure whole process of the test axis try hard to keep hold constant; And the shortcoming of this kind of test unit is that the axle power that in process of the test, hydraulic jack or vertical actuator apply is usually larger, the hinge that is connected with counter force system or sliding machine will be made accordingly to produce larger friction force, at this moment test the horizontal force recorded and just contain this part friction force, thus the accuracy of impact test measured result.
The advantage of Equations of The Second Kind test unit is, in process of the test, apply the axle power needed for test by the bolt tightened on component upper and lower side steel plate, there is not friction between test specimen and counter force system, therefore the measured value of horizontal loading P is more accurate; And the shortcoming of this kind of test unit is, the axle power of pillar generally only applies before on-test, cannot adjust it in time or compensate when pillar axle power changes in process of the test, and whole process of the test axis power cannot be remained unchanged.
In sum, all there is error to a certain extent in existing two kinds of test units, all accurately cannot record test figure.
Summary of the invention
To the object of the invention is to solve in existing charger the large and uncontrollable problem of column axial force of friction effects.
The technical scheme adopted for realizing the object of the invention is such, can frictional influence be eliminated and the charger that can control column axial force, it is characterized in that: comprise reaction beam, counter-force post, vertical actuator, pull pressure sensor I, horizontal actuator, pull pressure sensor II, pull pressure sensor III, test specimen, hinge, positioning seat I, positioning seat II, coupling arrangement I, coupling arrangement II and stationary installation.
Described test specimen is " ten " font beam-column subassemblage framework, and described beam-column subassemblage framework is divided into four up and down, and four xsects of described test specimen are rectangle.
Described reaction beam and counter-force post are steel structure support, and the two ends of described reaction beam are separately fixed on two counter-force posts.Described stationary installation comprises steel plate I, steel plate II, steel plate III, threaded rod I, threaded rod II, threaded rod III, threaded rod IV.
Described sensor and test specimen stationary installation are fixed, and concrete fixed form is: an end face of described sensor connects with steel plate I, and another end face of sensor connects with steel plate II.Described test specimen upper connect with steel plate II, lower of test specimen connects with steel plate III.Described threaded rod I, threaded rod II, threaded rod III, threaded rod IV from top to bottom successively through steel plate I, steel plate II, steel plate III, and use nut screwing clamping on the end face of steel plate I and steel plate III.
Described steel plate III is connected by hinge with level ground, as shown in Figure 4, described hinge comprises three fanning strips and coupling shaft, the shape size of described three fanning strips is consistent and be stacked together, and described fanning strip axis of symmetry is provided with through hole, and described coupling shaft is successively through the through hole of three fanning strips, by hinged for three fanning strips, and with nut screwing clamping coupling shaft tail end, the fanning strip in described centre position is fixed on steel plate III, and the fanning strip of both sides fixes on the ground;
Described pull pressure sensor I one end is connected by hinge with steel plate I, and described hinge is consistent with hinge shape and structure, and one end of the vertical actuator of described pull pressure sensor I other end is connected.
The other end of described vertical actuator is connected with coupling arrangement I, described coupling arrangement I is made up of hinge, threaded rod and steel plate, described steel plate is placed on the laterally zygomorphic position of reaction beam, described two panels steel plate is passed from top to bottom successively by four threaded rods, two panels steel plate is by nut screwing clamping, on the steel plate of described stud connection below reaction beam, described hinge is consistent with hinge shape.
One end of described horizontal actuator is connected with coupling arrangement II, and formation and the shape of described coupling arrangement II and coupling arrangement I are consistent, and two block plates of coupling arrangement II are fixed on counter-force post.
The other end of described horizontal actuator is connected with one end of pull pressure sensor II, the other end test specimen of described pull pressure sensor II upper be connected, coupling arrangement is consistent with coupling arrangement II.
Described positioning seat I is consistent with structure with positioning seat II shape, and position is relative to lower symmetry of test specimen.
Described positioning seat I and positioning seat II comprise base, roller ball hinge device, support bar and coupling arrangement, described roller ball hinge device is positioned at base top center, described support bar one end is connected with roller ball hinge device, the support bar other end is connected with coupling arrangement, described coupling arrangement is consistent with coupling arrangement I shape and structure, the left side that the coupling arrangement of positioning seat I is connected to test specimen is propped up, the right side that the coupling arrangement of described positioning seat II is connected to test specimen is propped up, the link position of the coupling arrangement of described positioning seat I and positioning seat II is relative to two symmetries up and down of test specimen.
Adopt and according to claim 1ly eliminate frictional influence and to the loading method of the charger that column axial force controls, can it is characterized in that, comprise the following steps:
1) be fixed between steel plate II and steel plate III by the longitudinal direction end of test specimen, transverse ends is separately fixed on the support bar of positioning seat I and positioning seat II;
2) adopt electronics torque-indicating wrencg by the bolt tightening on steel plate I and steel plate III, apply the column axial force needed for test in this way;
3) by horizontal actuator, the capital horizontal force needed for test is applied to test specimen, and vertical actuator does not apply acting force;
4) in step 3) complete after, when post axial force reduces or increases, apply pressure or pulling force by vertical actuator, coupled columns axial force adjusts, until pull pressure sensor III is equal with primitive axis power.
The process of adjustment is, if the relative initial value of column axial force reduces, just applies a downward pressure by vertical actuator, axle power is increased; If column axial force becomes large relative to initial value, just apply a pulling force upwards by vertical actuator, mass action is reduced in the axle power of pillar.
Further, described test specimen is suitable for for the test of " ten " font middle layer intermediate node, " ├ " shape middle layer mid-side node and pillar is same.
Further, four xsects of described test specimen are for circular, "T"-shaped same applicable.
Technique effect of the present invention is mathematical, device in the present invention, the capital horizontal loading recorded is very little by the impact of friction force, and experimenter from the size of main control axial force, can substantially increase the accuracy of test measured data in experimentation.
Accompanying drawing explanation
Fig. 1 is test unit schematic diagram of the present invention;
Fig. 2 is the vertical view of steel plate 8;
Fig. 3 is the test unit schematic diagram of " ├ " shape middle layer mid-side node;
Fig. 4 is the schematic diagram of hinge.
In figure: reaction beam 1, counter-force post 2, vertical actuator 3, pull pressure sensor I 4, horizontal actuator 5, pull pressure sensor II 6, pull pressure sensor III 7, steel plate I 8, steel plate II 9, steel plate III 10, threaded rod I 11, threaded rod II 12, threaded rod III 13, threaded rod IV 14, test specimen 15, hinge 16, positioning seat I 17, positioning seat II 18, coupling arrangement I 19, coupling arrangement II 20, stationary installation 21.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention and be only limitted to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacement and change, all should be included in protection scope of the present invention.
Can frictional influence be eliminated and the charger that can control column axial force and method, it is characterized in that: comprise reaction beam 1, counter-force post 2, vertical actuator 3, pull pressure sensor I 4, horizontal actuator 5, pull pressure sensor II 6, pull pressure sensor III 7, test specimen 15, hinge 16, positioning seat I 17, positioning seat II 18, coupling arrangement I 19, coupling arrangement II 20 and stationary installation 21.
Described test specimen 15 is " ten " font beam-column subassemblage frameworks, and described beam-column subassemblage framework is divided into four up and down, and four xsects of described test specimen 15 are rectangle.
Described reaction beam 1 is steel structure support with counter-force post 2, and the two ends of described reaction beam 1 are separately fixed on two counter-force posts 2.
Described stationary installation 21 comprises steel plate I 8, steel plate II 9, steel plate III 10, threaded rod I 11, threaded rod II 12, threaded rod III 13, threaded rod IV 14.
Described pull pressure sensor III 7 and test specimen 15 stationary installation 21 are fixed, and concrete fixed form is: an end face of described pull pressure sensor III 7 connects with steel plate I 8, and another end face of pull pressure sensor III 7 connects with steel plate II 9.Described test specimen 15 upper connect with steel plate II 9, lower of test specimen 15 connects with steel plate III 10.Described threaded rod I 11, threaded rod II 12, threaded rod III 13, threaded rod IV 14 from top to bottom successively through steel plate I 8, steel plate II 9, steel plate III 10, and use nut screwing clamping on the end face of steel plate I 8 and steel plate III 10.
Described steel plate III 10 is connected by hinge 16 with level ground, described hinge 16 comprises three fanning strips and coupling shaft, the shape size of described three fanning strips is consistent and be stacked together, described fanning strip axis of symmetry is provided with through hole, described coupling shaft passes the through hole of three fanning strips successively by hinged for three fanning strips, and with nut screwing clamping coupling shaft tail end, the fanning strip in described centre position is fixed on steel plate III 10, and the fanning strip of both sides fixes on the ground;
Described pull pressure sensor I 4 one end is connected by hinge with steel plate I 8, and described hinge is consistent with hinge 16 shape and structure, and one end of the vertical actuator 3 of described pull pressure sensor I 4 other end is connected.
The other end of described vertical actuator 3 is connected with coupling arrangement I 19, described coupling arrangement I 19 is made up of hinge, threaded rod and steel plate, described steel plate is placed on the laterally zygomorphic position of reaction beam 1, described two panels steel plate is passed from top to bottom successively by four threaded rods, two panels steel plate is by nut screwing clamping, on the steel plate of described stud connection below reaction beam 1, described hinge is consistent with hinge 16 shape.
One end of described horizontal actuator 5 is connected with coupling arrangement II 20, and formation and the shape of described coupling arrangement II 20 and coupling arrangement I 19 are consistent, and two block plates of coupling arrangement II 20 are fixed on counter-force post 2.
The other end of described horizontal actuator 5 is connected with one end of pull pressure sensor II 6, the other end test specimen 15 of described pull pressure sensor II 6 upper be connected, coupling arrangement is consistent with coupling arrangement II 20.
Described positioning seat I 17 is consistent with structure with positioning seat II 18 shape, and position is relative to lower symmetry of test specimen 15.
Described positioning seat I 17 and positioning seat II 18 comprise base, roller ball hinge device, support bar and coupling arrangement, described roller ball hinge device is positioned at base top center, described support bar one end is connected with roller ball hinge device, the support bar other end is connected with coupling arrangement, described coupling arrangement is consistent with coupling arrangement I 19 shape and structure, the left side that the coupling arrangement of positioning seat I 17 is connected to test specimen 15 is propped up, the right side that the coupling arrangement of described positioning seat II 18 is connected to test specimen 15 is propped up, the link position of the coupling arrangement of described positioning seat I 17 and positioning seat II 18 is relative to two symmetries up and down of test specimen 15.
Adopt the above-mentioned frictional influence eliminated and to the loading method of the charger that column axial force controls, can it is characterized in that, comprise the following steps:
1) be fixed between steel plate II 9 and steel plate III 10 by the longitudinal direction end of test specimen 15, transverse ends is separately fixed on the support bar of positioning seat I 17 and positioning seat II 18;
2) adopt electronics torque-indicating wrencg by the bolt tightening on steel plate I 8 and steel plate III 10, apply the column axial force needed for test in this way;
3) by horizontal actuator 5, the capital horizontal force needed for test is applied to test specimen, and vertical actuator 3 does not apply acting force;
4) in step 3) complete after, post axial force reduce or increase time, apply pressure or pulling force by vertical actuator 3, coupled columns axial force adjusts, until pull pressure sensor III 7 is equal with primitive axis power.
The process of adjustment is, if the relative initial value of column axial force reduces, just applies a downward pressure by vertical actuator, axle power is increased; If column axial force becomes large relative to initial value, just apply a pulling force upwards by vertical actuator, mass action is reduced in the axle power of pillar.
In process of the test, due to reasons such as column inclination and screw rod, bolt stress are lax, post axial force generally will reduce (incipient stage also slightly may become large), now by the vertical actuator in top, pulling force or pressure are applied to pillar, coupled columns axial force adjusts timely, in process of the test, pass through the constant of force snesor retainer shaft power.
Therefore, in new test unit, major part axle power is applied by steel plate, threaded rod, bolt, very little a part of axle power is only had to be applied by the vertical actuator be connected with reaction frame, the axial force applied due to vertical actuator is less, and the friction force that the hinge be connected with reaction frame accordingly or sliding machine produce is also very little.Therefore, the capital horizontal loading that new equipment records is very little by the impact of friction force, and experimenter from the size of main control axial force, can substantially increase the accuracy of test measured data in experimentation.
Claims (4)
1. can eliminate frictional influence and the charger that can control column axial force, it is characterized in that: comprise reaction beam (1), counter-force post (2), vertical actuator (3), pull pressure sensor I (4), horizontal actuator (5), pull pressure sensor II (6), pull pressure sensor III (7), test specimen (15), hinge (16), positioning seat I (17), positioning seat II (18), coupling arrangement I (19), coupling arrangement II (20) and stationary installation (21);
Described test specimen (15) is " ten " font beam-column subassemblage framework, and described beam-column subassemblage framework is divided into four up and down, and four xsects of described test specimen (15) are rectangle;
Described reaction beam (1) and counter-force post (2) are steel structure support, and the two ends of described reaction beam (1) are separately fixed on two counter-force posts (2);
Described stationary installation (21) comprises steel plate I (8), steel plate II (9), steel plate III (10), threaded rod I (11), threaded rod II (12), threaded rod III (13), threaded rod IV (14);
Described pull pressure sensor III (7) and test specimen (15) stationary installation (21) are fixed, concrete fixed form is: an end face of described pull pressure sensor III (7) connects with steel plate I (8), and another end face of pull pressure sensor III (7) connects with steel plate II (9); Described test specimen (15) upper connect with steel plate II (9), lower of test specimen (15) connects with steel plate III (10); Described threaded rod I (11), threaded rod II (12), threaded rod III (13), threaded rod IV (14) from top to bottom successively through steel plate I (8), steel plate II (9), steel plate III (10), and on the end face of steel plate I (8) and steel plate III (10) use nut screwing clamping;
Described steel plate III (10) is connected by hinge (16) with level ground, described hinge (16) comprises three fanning strips and coupling shaft, the shape size of described three fanning strips is consistent and be stacked together, described fanning strip axis of symmetry is provided with through hole, described coupling shaft passes the through hole of three fanning strips successively by hinged for three fanning strips, and with nut screwing clamping coupling shaft tail end, the fanning strip in described centre position is fixed on steel plate III (10), and the fanning strip of both sides fixes on the ground;
Described pull pressure sensor I (4) one end is connected by hinge with steel plate I (8), described hinge is consistent with hinge (16) shape and structure, and described pull pressure sensor I (4) other end is connected with one end of vertical actuator (3);
The other end of described vertical actuator (3) is connected with coupling arrangement I (19), described coupling arrangement I (19) is made up of hinge, threaded rod and steel plate, described steel plate is placed on reaction beam (1) laterally zygomorphic position, described two panels steel plate is passed from top to bottom successively by four threaded rods, two panels steel plate is by nut screwing clamping, described stud connection is on the steel plate of reaction beam (1) below, and described hinge is consistent with hinge (16) shape;
One end of described horizontal actuator (5) is connected with coupling arrangement II (20), formation and the shape of described coupling arrangement II (20) and coupling arrangement I (19) are consistent, and two block plates of coupling arrangement II (20) are fixed on counter-force post (2);
The other end of described horizontal actuator (5) is connected with one end of pull pressure sensor II (6), the other end of described pull pressure sensor II (6) and test specimen (15) upper be connected, coupling arrangement is consistent with coupling arrangement II (20);
Described positioning seat I (17) is consistent with structure with positioning seat II (18) shape, and position is relative to lower symmetry of test specimen (15);
Described positioning seat I (17) and positioning seat II (18) comprise base, roller ball hinge device, support bar and coupling arrangement, described roller ball hinge device is positioned at base top center, described support bar one end is connected with roller ball hinge device, the support bar other end is connected with coupling arrangement, described coupling arrangement is consistent with coupling arrangement I (19) shape and structure, the left side that the coupling arrangement of positioning seat I (17) is connected to test specimen (15) is propped up, the right side that the coupling arrangement of described positioning seat II (18) is connected to test specimen (15) is propped up, the link position of the coupling arrangement of described positioning seat I (17) and positioning seat II (18) is relative to two symmetries up and down of test specimen (15).
2. employing is according to claim 1 eliminates frictional influence and to the loading method of the charger that column axial force controls, can it is characterized in that, comprise the following steps:
1) be fixed between steel plate II (9) and steel plate III (10) by the longitudinal direction end of test specimen (15), transverse ends is separately fixed on the support bar of positioning seat I (17) and positioning seat II (18);
2) adopt electronics torque-indicating wrencg by the bolt tightening on steel plate I (8) and steel plate III (10), apply the column axial force needed for test in this way;
3) by horizontal actuator (5), the capital horizontal force needed for test is applied to test specimen, and vertical actuator (3) does not apply acting force;
4) in step 3) complete after, when post axial force reduces or increases, apply pressure or pulling force by vertical actuator (3), coupled columns axial force adjusts, until pull pressure sensor III (7) is equal with primitive axis power.
3. according to claim 1ly eliminate frictional influence and to the loading method of the charger that column axial force controls, can it is characterized in that: described test specimen (15) is suitable for for the test of " ten " font middle layer intermediate node, " ├ " shape middle layer mid-side node and pillar is same.
4. according to claim 1ly eliminate frictional influence and to the loading method of the charger that column axial force controls, can it is characterized in that: four xsects of described test specimen (15) are for circular and T-shaped is applicable equally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510795909.5A CN105466758B (en) | 2015-11-18 | 2015-11-18 | The loading device and method that frictional influence can be eliminated and column axial force can be controlled |
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| CN201510795909.5A CN105466758B (en) | 2015-11-18 | 2015-11-18 | The loading device and method that frictional influence can be eliminated and column axial force can be controlled |
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| CN105865733A (en) * | 2016-04-28 | 2016-08-17 | 福州大学 | Test method for verifying friction force of sliding support base and test device |
| CN108241289A (en) * | 2017-11-21 | 2018-07-03 | 华西能源工程有限公司 | A kind of compoundforce-displacement control method for Three Degree Of Freedom loading system |
| CN108760520A (en) * | 2018-07-27 | 2018-11-06 | 山东大学 | A kind of steel applying pressure-concrete push out test loading device and method |
| CN109374246A (en) * | 2018-11-02 | 2019-02-22 | 湖南工业大学 | Simulate the experimental rig that crossed beam and column node bears horizontal earthquake action |
| CN110657931A (en) * | 2019-08-22 | 2020-01-07 | 广西大学 | Loading device for vertical member anti-seismic performance test under partial pulling working condition |
| CN113588422A (en) * | 2021-08-06 | 2021-11-02 | 东南大学 | Testing device and testing method for applying horizontal load and vertical load on single column |
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| CN104390845A (en) * | 2014-11-26 | 2015-03-04 | 同济大学 | Portable multifunctional soil mechanical property test device |
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| CN105865733A (en) * | 2016-04-28 | 2016-08-17 | 福州大学 | Test method for verifying friction force of sliding support base and test device |
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| CN109374246A (en) * | 2018-11-02 | 2019-02-22 | 湖南工业大学 | Simulate the experimental rig that crossed beam and column node bears horizontal earthquake action |
| CN110657931A (en) * | 2019-08-22 | 2020-01-07 | 广西大学 | Loading device for vertical member anti-seismic performance test under partial pulling working condition |
| CN113588422A (en) * | 2021-08-06 | 2021-11-02 | 东南大学 | Testing device and testing method for applying horizontal load and vertical load on single column |
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|---|---|
| CN105466758B (en) | 2018-05-08 |
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