CN111693377B - Lateral pressure and vertical shearing eccentric bidirectional loading experimental device and experimental method thereof - Google Patents
Lateral pressure and vertical shearing eccentric bidirectional loading experimental device and experimental method thereof Download PDFInfo
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- CN111693377B CN111693377B CN202010745267.9A CN202010745267A CN111693377B CN 111693377 B CN111693377 B CN 111693377B CN 202010745267 A CN202010745267 A CN 202010745267A CN 111693377 B CN111693377 B CN 111693377B
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- 239000000463 material Substances 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N3/02—Details
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention provides a lateral pressure and vertical shearing eccentric bidirectional loading experimental device and an experimental method thereof, wherein the experimental device comprises a working platform and a horizontal four-column hydraulic press, and the working platform is provided with a sliding rail; the middle cross beam of the four-column hydraulic machine is fixedly connected with the working platform, and the left cross beam and the right cross beam are arranged on the sliding rail through rollers; the left cross beam is connected with the right cross beam through a connecting rod; the bidirectional eccentric positioning device comprises a square guide rail frame, one frame of the square guide rail frame is arranged on the middle cross beam through a bidirectional eccentric position adjusting structure, and the other three frames are frame guide rails; three screws are arranged on the side face of the pressure punch head and are respectively perpendicular to the three frame guide rails; each screw is movably provided with a pulley which is arranged on the frame guide rail; the vertical loading device is used for applying force to the pressure punch. The invention is used for the test loading test of the prefabricated assembly segment bridge joint key teeth under the multidirectional load effect, and the damage mechanism and damage mode of the key teeth under the complex stress mode are explored.
Description
Technical Field
The invention relates to experimental tests of bridge engineering and structural engineering, in particular to a lateral pressure and vertical shearing eccentric bidirectional loading experimental device and an experimental method thereof.
Background
In bridge structures prefabricated of segments, shear key teeth are usually provided at the connection points of the segments. The tooth is an important component of the modern segmental prefabricated assembled beam, and the stress state is very complex. Firstly, under the actions of prestress ribs, temperature and shrinkage creep, the key teeth can bear the action of lateral pressure, and the size of the lateral pressure can be different according to the arrangement of the prestress ribs; secondly, under the action of active load of an automobile or a train, the key teeth are also subjected to vertical reciprocating shearing load, and the vertical load is often eccentric to the tooth-shaped center. In combination, the key teeth are in a complex state of multidirectional stress, which appears to change as the geometry of the structure, material properties, and random loading conditions change. Therefore, in order to explore the stress failure mechanism and mechanical properties of the key teeth of the segment Liang Jianli, a small proportion of key teeth test pieces are generally designed to carry out experimental study. However, in conventional test methods, lateral forces are typically applied using pre-stressed steel strands; the vertical force is then applied by a conventional actuator to center the load. The problems with this approach are mainly: 1. the lateral force exerted by the prestressed tendons cannot be accurately controlled after the test is continuously loaded and the test piece is damaged, and the stretching and retraction of the steel strand can influence the application effect of the lateral force; more importantly, as the prestress rib penetrates through the key tooth test piece, a certain vertical shearing force can be shared, and the system error of the test is increased; 2. the initial centering and leveling of the vertically loaded actuator are very difficult, and accurate application of the eccentric force of the test piece in the bending-shearing composite state is almost impossible. 3. When the external load is greater than the frictional force of key tooth friction surface, can take place the dislocation between the negative tooth and the positive tooth, the key tooth can participate in the atress, and after the key tooth atress, key tooth side direction force error and vertical reciprocating shearing's eccentric error further enlarge, have further aggravated the inaccuracy of test.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a lateral pressure and vertical shearing eccentric bidirectional loading experimental device and an experimental method thereof, which can overcome the shortcomings of the prior art.
The technical scheme adopted for solving the technical problems is as follows:
The lateral pressure and vertical shearing eccentric bidirectional loading experimental device comprises a working platform with scale marks and a horizontal four-column hydraulic machine, wherein the working platform is provided with a sliding rail; the four-column hydraulic press comprises a left beam, a middle beam and a right beam which are sequentially arranged, wherein the middle beam is fixedly connected with the working platform, and the left beam and the right beam are arranged on the sliding rail through rollers; the left cross beam and the right cross beam are connected through a connecting rod, and the connecting rod movably passes through a through hole corresponding to the middle cross beam;
The device also comprises a bidirectional eccentric positioning device; the bidirectional eccentric positioning device comprises a horizontal square guide rail frame, and one frame of the square guide rail frame is arranged on the middle cross beam through a bidirectional eccentric position adjusting structure;
the other three frames of the square guide rail frame are all frame guide rails and are provided with scales;
The device also comprises a pressure punch, wherein the lower part of the pressure punch is provided with a semicircular steel ball, three screws are arranged on the side surface of the pressure punch, and the three screws are respectively perpendicular to three frame guide rails of the square guide rail frame; a pulley is movably arranged on each screw rod, and the pulleys are closely adhered to the screw rods and can roll and slide on the screw rods;
the pulleys are arranged on the frame guide rails of the square guide rail frame and roll along the frame guide rails;
The vertical loading device is positioned above the pressure punch and applies acting force to the pressure punch.
Furthermore, the left cross beam and the middle cross beam are correspondingly provided with a certain specification and a certain number of mounting holes with scale marks, and the scale marks of the mounting holes are matched with the scale marks of the working platform; still include the steel column, steel wheel one end install in the mounting hole, the steel wheel is installed to the other end.
The bidirectional eccentric position adjusting structure comprises a stand column and an auxiliary stand column, wherein the stand column and the auxiliary stand column are fixed on a middle cross beam, and the bidirectional eccentric position adjusting structure further comprises an up-down moving part which is connected with the stand column in a sliding manner and moves up and down along the stand column;
The auxiliary upright post is provided with a limiter, the position of the limiter can be adjusted along the auxiliary upright post, and the limiter is used for adjusting and fixing the up-down moving part on a certain height of the upright post;
The up-and-down moving part is arranged on a telescopic horizontal rod, and the telescopic horizontal rod is connected with the horizontal square guide rail frame through the rod.
Further, the side face of the pressure punch is provided with three screw holes, the three screw holes are at the same horizontal height, the two holes are axially on the same straight line, the other hole is axially perpendicular to the straight line, and the end part of the screw rod is arranged in the screw hole.
The test method of the invention is to perform centering design on the component which is in direct contact with the test piece in the lateral pressure loading device, so that the purpose that only lateral force is applied to the component but vertical displacement of the test piece is not restrained can be achieved. The adjustment of the vertical loading eccentricity is coarse-tuned by designing a device capable of adjusting the elevation and the horizontal distance, and the final accurate positioning is performed by utilizing the accurate positioning device designed in the invention, so that the eccentric loading positioning can be accurately performed according to the set eccentric distance. Specific:
the test method of the lateral pressure and vertical shearing eccentric bidirectional loading experimental device comprises the following steps:
according to the size, the lateral loading position and the placing position of the test piece on the working platform, different mounting holes are selected, and the steel columns are respectively mounted in the mounting holes on the left cross beam and the middle cross beam;
after the test piece is placed in place, starting the hydraulic press to enable the left beam and the middle beam to apply lateral force to the test piece through the steel column, wherein the steel wheel of the steel column is in direct contact with the test piece, and when the male teeth and the female teeth of the test piece are staggered, the steel wheel of the steel column rotates along with the female teeth of the test piece;
after the lateral force is applied, a bidirectional eccentric positioning device is arranged at the center of the top of the middle cross beam, a telescopic horizontal rod piece is adjusted to enable the square guide rail frame to be approximately located above the test piece, then a semicircular steel ball at the lower part of the pressure punch is enabled to be just contacted with the top surface of the test piece through adjusting the up-down moving part, and then a limiter is fixedly connected to enable the up-down moving part to be fixed at the current height; the center position of the top surface of the test piece is marked, then the pulleys on the square guide rail frame are moved, the screw rod arranged on the pressure punch is axially shuttled along the pulleys, the contact point of the semicircular steel ball of the pressure punch and the test piece is positioned at the center position of the test piece, the scale values of the three pulleys rolled on the square guide rail frame are respectively recorded, and then the scale values of the pulleys rolled on the square guide rail frame after the eccentricity is adjusted are calculated according to the eccentric distance determined by experiments. And then, running through the pulleys and axially shuttling along the pulleys by matching with the screw rods, so that the three pulleys roll to the calculated corresponding scale values on the square guide rail frame. At the moment, the contact point of the semicircular ball at the lower part of the pressure punch and the test piece is the eccentric loading position determined by the test.
After the eccentric loading position is regulated and determined, an external vertical loading device is started to act on the pressure punch, and after the vertical loading device is contacted with the pressure punch, the eccentric positioning device is removed. Disassembling the square guide rail frame, the pulley, the screw rod, the telescopic horizontal rod piece and the rod piece; the test piece starts to be loaded by a vertical test.
The device can be used for experimental loading test research of prefabricated assembled segment bridge joint key teeth under the action of multidirectional load, can meet the requirement that the female and Yang Jian teeth are not influenced by lateral constraint after being dislocated while applying lateral pressure to key tooth test pieces, and can steplessly adjust the vertical loading longitudinal and transverse eccentric distances of the key teeth, thereby being beneficial to experimental exploration of the damage mechanism and damage modes of the key teeth under different complex stress modes. The invention can also be applied to other similar loading tests.
Drawings
The specification includes the following seven drawings:
FIG. 1 is a schematic diagram of the overall structure of an experimental device of the invention without a test piece;
FIG. 2 is a schematic view of the overall structure of the test piece of the test device of the present invention after the test piece is placed and lateral force is applied;
FIG. 3 is a schematic view of the structure of the bi-directional eccentric positioning device of the experimental apparatus of the present invention;
FIG. 4 is a schematic view of the structure of the pressure punch after the screw is disassembled;
FIG. 5 is a schematic view of the structure of the present invention for precisely adjusting eccentric positioning;
FIG. 6 is a schematic view of a square rail frame assembly and disassembly apparatus of the present invention;
FIG. 7 is a schematic view of the structure of the disassembled square guide rail frame of the present invention;
FIG. 8 is a schematic view of the present invention after the bi-directional eccentric positioning device has been disassembled and the pressure ram is loaded on the test piece by the vertical loading device.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The following description will be made mainly by taking the application of the device in a multi-directional loading test of a key tooth as an example.
Referring to fig. 1 to 8, a lateral pressure and vertical shearing eccentric bidirectional loading experimental device comprises a working platform 1 with scale marks and a horizontal four-column hydraulic machine, wherein the working platform 1 is provided with a sliding rail 2; the four-column hydraulic press comprises a left cross beam 3, a middle cross beam 4 and a right cross beam 5 which are sequentially arranged, wherein the middle cross beam 4 is fixedly connected with the working platform 1, and the left cross beam 3 and the right cross beam 5 are arranged on the sliding rail 2 through rollers; the left cross beam 3 and the right cross beam 5 are connected through a connecting rod, and the connecting rod movably passes through a through hole corresponding to the middle cross beam 4;
The left cross beam 3 and the middle cross beam 4 are correspondingly provided with a certain specification and a certain number of mounting holes 6 with scale marks, and the scale marks of the mounting holes 6 are matched with the scale marks of the working platform 1; still include steel column 7, steel wheel one end install in mounting hole 6, the steel wheel is installed to the other end.
The device also comprises a bidirectional eccentric positioning device; the bidirectional eccentric positioning device comprises a horizontal square guide rail frame 13, and one frame of the square guide rail frame 13 is arranged on the middle cross beam 4 through a bidirectional eccentric position adjusting structure;
the other three frames of the square guide rail frame 13 are frame guide rails and are provided with scales;
The bidirectional eccentric position adjusting structure comprises a stand column 8 and an auxiliary stand column 10, wherein the stand column 8 and the auxiliary stand column 10 are fixed on the middle cross beam 4, and the bidirectional eccentric position adjusting structure further comprises an up-down moving part 9, the up-down moving part 9 is in sliding connection with the stand column 8, and the up-down moving part 9 moves up and down along the stand column 8;
The auxiliary upright post 10 is provided with a limiter 11, the position of the limiter 11 can be adjusted along the auxiliary upright post 10, and the limiter 11 is used for adjusting and fixing the up-and-down moving part 9 on a certain height of the upright post 8;
the up-and-down moving member 9 is mounted on a telescopic horizontal bar 12, and the telescopic horizontal bar 12 is connected to a horizontal square rail frame 13 through a bar 19.
The device also comprises a pressure punch 14, wherein a semicircular steel ball 16 is arranged at the lower part of the pressure punch 14, three screws 17 are arranged on the side surface of the pressure punch 14, and the three screws 17 are respectively perpendicular to three frame guide rails of the square guide rail frame 13; a pulley 18 is movably arranged on each screw 17, and the pulley 18 is tightly adhered to the screw 17 and can roll and slide on the screw 17; the pulley 18 is arranged on the frame guide rail of the square guide rail frame 13 and rolls along the frame guide rail;
The side of the specific pressure punch 14 is provided with three screw holes 15, the three screw holes 15 are at the same horizontal height, the two axial holes are on a straight line, the other axial hole is vertical to the straight line, and the end part of a screw rod 17 is arranged in the screw hole 15.
Also included is a vertical loading device 22, the vertical loading device 22 being located above the pressure ram 14 and applying a force to the pressure ram 14.
The experimental process is as follows:
After the test piece 23 is put in place by referring to fig. 2, the hydraulic press 24 is started, so that the left beam 3 and the middle beam 4 apply lateral force to the test piece 23 through the steel column 7, the steel wheel of the steel column 7 is in direct contact with the test piece 23, and when the male teeth and the female teeth of the test piece 23 are dislocated, the steel wheel rotates along with the dislocation of the key teeth of the test piece 23 is not limited.
Referring to fig. 2 and 3, after the lateral force is applied, the adjustment of the bi-directional eccentric position adjustment structure shown in fig. 3 installed at the midpoint of the top of the center cross member 4 is started. The up-and-down moving part 9 which is matched with the upright post 8 is tightly adhered to the upright post 8 and can slide up and down freely. The auxiliary upright post 10 is provided with a solidifiable and slidable limiter 11, and the up-and-down moving part 9 can be adjusted and fixed on a certain height of the upright post 8.
The height of the square guide rail frame 13 can be adjusted by adjusting the up-and-down moving part 9 to slide up and down along the upright post 8 and matching with the auxiliary upright post 10 and the limiter 11; the horizontal distance of the square guide rail frame 13 can be adjusted by adjusting the telescopic horizontal bar 12.
Referring to fig. 3, 4 and 5, the pulley 18 is sized to fit the graduated removable square rail frame 13 and to be tightly clamped to and run on the square rail frame 13. The pressure punch 14 is supported on a detachable square guide frame 13 by a detachable screw 17 and a matched pulley 18. The pressure punch 14 can realize the position adjustment in the horizontal plane in the longitudinal and transverse directions by the running of the pulley 18 on the square guide rail frame 13 and the shuttling of the screw 17 along the axial direction of the pulley 18.
Referring to fig. 2,3 and 5, the telescopic rod 12 is adjusted so that the square guide rail frame 13 is positioned approximately above the test piece, then the semicircular steel ball 16 at the lower part of the pressure punch 14 is just contacted with the top surface of the test piece 23 by adjusting the up-down moving part 9, and then the limiter 11 is fixedly connected, so that the steel sleeve 9 is fixed at the current height. The top surface of the test piece 23 is marked with a central position, then the pulley 18 on the graduated square guide rail frame 13 moves, the screw 17 arranged on the pressure punch 14 axially shuttles along the pulley 18, the contact point of the semicircular steel ball 16 of the pressure punch 14 and the test piece 23 is positioned at the marked position of the test piece, the scale values of the three pulleys 18 rolled on the graduated guide rail frame 13 are respectively recorded, and then the scale value of the pulley 18 rolled on the guide rail frame 13 after the eccentricity is adjusted is calculated according to the eccentric distance set by experiments. And then the three pulleys 18 roll to the calculated corresponding scale values on the guide rail frame 13 by running through the pulleys 18 and axially shuttling along the pulleys 18 in cooperation with the screw 17. At this time, the contact point between the lower half ball 16 of the pressure punch 14 and the test piece 23 is the eccentric loading position determined by the test.
Referring to fig. 4,5, 6, 7 and 8, after the eccentric loading position is adjusted, the external vertical loading device 22 is started to act on the pressure punch 14, and when the vertical loading device 22 contacts with the pressure punch 14, the bidirectional eccentric positioning device can be removed. The disassembly sequence is that the square rail frame 13 is disassembled firstly, then the pulley 18 and the screw 17 are disassembled, and finally the telescopic horizontal rod piece 12 and the rod piece 19 which are connected into a whole are slid on the upright post 8 through the up-down moving part 9 to be taken down.
Referring to fig. 6 and 7, the square guide frame 13 is assembled by four frames through the connecting device 20 and the insertion pins 21.
Referring to fig. 8, after the bi-directional eccentric positioning device is positioned and removed, the test piece 23 starts to be subjected to test loading.
The invention has simple structure and convenient operation and use, can meet the test requirement of unconstrained dislocation of male and female teeth while applying lateral force to a test piece in the key tooth test, improves the accuracy of the test result of the shear key tooth, and is favorable for deep study of the mechanical mechanism of the shear key tooth. The invention can accurately adjust the eccentric distance of eccentric loading, and is beneficial to exploring the shearing mechanism of the key teeth under different stress modes. The device can also be applied to other similar eccentric loading tests.
The foregoing is illustrative of the principles of the present invention in a loading device having adjustable lateral pressure and vertical shear eccentricity and is not intended to limit the invention to the specific structure and application shown and described, so that all such modifications and equivalents may be resorted to, falling within the scope of the invention as defined by the appended claims.
Claims (3)
1. The lateral pressure and vertical shearing eccentric bidirectional loading experimental device is characterized by comprising a working platform (1) with scale marks and a horizontal four-column hydraulic press, wherein the working platform (1) is provided with a sliding rail (2); the four-column hydraulic machine comprises a left cross beam (3), a middle cross beam (4) and a right cross beam (5) which are sequentially arranged, wherein the middle cross beam (4) is fixedly connected with a working platform (1), and the left cross beam (3) and the right cross beam (5) are arranged on a sliding rail (2) through rollers; the left cross beam (3) and the right cross beam (5) are connected through a connecting rod, and the connecting rod movably passes through a through hole corresponding to the middle cross beam (4);
the device also comprises a bidirectional eccentric positioning device; the bidirectional eccentric positioning device comprises a horizontal square guide rail frame (13), and one frame of the square guide rail frame (13) is arranged on the middle cross beam (4) through a bidirectional eccentric position adjusting structure;
the other three frames of the square guide rail frame (13) are all frame guide rails and are provided with scales;
The device also comprises a pressure punch (14), wherein a semicircular steel ball (16) is arranged at the lower part of the pressure punch (14), three screws (17) are arranged on the side surface of the pressure punch (14), and the three screws (17) are respectively perpendicular to three frame guide rails of the square guide rail frame (13); a pulley (18) is movably arranged on each screw (17), and the pulley (18) is tightly adhered to the screw (17) and can roll and slide on the screw (17);
The pulley (18) is arranged on a frame guide rail of the square guide rail frame (13) and rolls along the frame guide rail;
The vertical loading device (22) is positioned above the pressure punch (14) and applies acting force to the pressure punch (14);
The left cross beam (3) and the middle cross beam (4) are correspondingly provided with a certain specification and a certain number of mounting holes (6) with scale marks, and the scale marks of the mounting holes (6) are matched with the scale marks of the working platform (1); the steel column (7) is arranged in the mounting hole (6) at one end, and a steel wheel is arranged at the other end of the steel column (7); the left cross beam (3) and the middle cross beam (4) apply lateral force to the test piece (23) through the steel column (7), the steel wheel of the steel column (7) is in direct contact with the test piece (23), and when the male teeth and the female teeth of the test piece (23) are staggered, the steel wheel rotates along with the positive teeth, so that the staggered movement of the key teeth of the test piece (23) is not limited;
The bidirectional eccentric position adjusting structure comprises a stand column (8) and an auxiliary stand column (10), wherein the stand column (8) and the auxiliary stand column (10) are fixed on a middle cross beam (4), and the bidirectional eccentric position adjusting structure further comprises an up-down moving part (9), the up-down moving part (9) is in sliding connection with the stand column (8), and the up-down moving part (9) moves up and down along the stand column (8);
A limiter (11) is arranged on the auxiliary upright post (10), the position of the limiter (11) can be adjusted along the auxiliary upright post (10), and the limiter (11) is used for adjusting and fixing the up-and-down moving part (9) on a certain height of the upright post (8);
The up-and-down moving part (9) is arranged on a telescopic horizontal rod piece (12), and the telescopic horizontal rod piece (12) is connected with a horizontal square guide rail frame (13) through a rod piece (19).
2. The lateral pressure and vertical shearing eccentric bidirectional loading experimental device according to claim 1, wherein three screw holes (15) are arranged on the side face of the pressure punch (14), the three screw holes (15) are at the same horizontal height, the two holes are axially on the same straight line, the other hole is axially perpendicular to the straight line, and the end part of the screw rod (17) is arranged in the screw hole (15).
3. The lateral pressure and vertical shearing eccentric bidirectional loading experimental method is characterized by adopting the lateral pressure and vertical shearing eccentric bidirectional loading experimental device as claimed in claim 1 or 2, and comprises the following steps:
According to the size, the lateral loading position and the placement position of a test piece (23) on the working platform (1), different mounting holes (6) are selected, and steel columns (7) are respectively mounted in the mounting holes (6) on the left cross beam (3) and the middle cross beam (4); after the test piece (23) is placed in place, a hydraulic press (24) is started, so that the left cross beam (3) and the middle cross beam (4) apply lateral force to the test piece (23) through the steel column (7), the steel wheel of the steel column (7) is in direct contact with the test piece (23), and when the female and male teeth of the test piece (23) are staggered, the steel wheel of the steel column (7) rotates along with the positive teeth of the test piece;
After the application of the lateral force is completed, a bidirectional eccentric positioning device is installed at the center of the top of the middle cross beam (4), the telescopic horizontal rod piece (12) is adjusted to enable the square guide rail frame (13) to be approximately located above the test piece (23), then the semicircular steel ball (16) at the lower part of the pressure punch (14) is enabled to be just contacted with the top surface of the test piece (23) through adjusting the up-down moving part (9), and then the limiter (11) is fixedly connected to enable the up-down moving part (9) to be fixed at the current height; marking the center position of the top surface of a test piece (23), then enabling a pulley (18) on a square guide rail frame (13) to run, enabling a screw (17) arranged on a pressure punch (14) to axially shuttle along the pulley (18), enabling the contact point of a semicircular steel ball (16) of the pressure punch (14) and the test piece (23) to be positioned at the center position of the test piece, respectively recording the scale values of the three pulleys (18) rolled on the square guide rail frame (13), and then calculating the scale value of the square guide rail frame (13) rolled by the pulley (18) after the eccentricity is adjusted according to the eccentric distance set by experiments; then, the three pulleys (18) roll to the calculated scale values corresponding to the square guide rail frame (13) by running through the pulleys (18) and cooperating with the screw rods (17) to shuttle along the pulleys (18); at the moment, the contact point of the semicircular steel ball (16) at the lower part of the pressure punch (14) and the test piece (23) is the eccentric loading position determined by the test;
After the eccentric loading position is regulated and determined, an external vertical loading device (22) is started and acts on the pressure punch (14), and after the vertical loading device (22) is contacted with the pressure punch (14), the eccentric positioning device is removed, and the square guide rail frame (13), the pulley (18), the screw (17), the telescopic horizontal rod (12) and the rod (19) are removed; the test piece (23) starts to be loaded by a vertical test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010745267.9A CN111693377B (en) | 2020-07-29 | 2020-07-29 | Lateral pressure and vertical shearing eccentric bidirectional loading experimental device and experimental method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010745267.9A CN111693377B (en) | 2020-07-29 | 2020-07-29 | Lateral pressure and vertical shearing eccentric bidirectional loading experimental device and experimental method thereof |
Publications (2)
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