Eccentricity identification and correction centering device in axis loading test of column

Abstract

An eccentricity identification and correction centering device in an axis loading test of a column comprises a column body for testing, a jack, steel column hinges, base plates and a force sensor, the column body is horizontally installed in a reaction frame, the front end and the rear end of the column body abut against the base plates for positioning through the steel column hinges, and the other face of the base plate on the rear side abuts against the inner wall of the reaction frame. The front side base plate abuts against the top telescopic section of the jack, the bottom of the jack abuts against the inner wall of the reaction frame, scale marks facilitating visual checking of output displacement of the jack are arranged on the telescopic section of the jack in the length direction, and four force sensors are distributed at the bottom of the jack. The left side and the right side of the jack are provided with hand-operated spiral propelling devices capable of clamping the jack and horizontally and finely adjusting the position of the jack. The device is simple and reasonable in structure and convenient to operate, in the experiment process, data of displacement and force during loading can be visually seen, whether centering exists or not can be rapidly judged, rollover caused by non-centering is effectively avoided, and the test accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of axial loading tests for structural columns, and relates to an axial loading test device for structural columns, specifically to an eccentricity identification and correction centering device for an axial loading test device for structural columns. Background Art

[0002] The axial compression test of columns is a test for the axial force-bearing performance of columns perpendicular to the ground, and is an important means to evaluate the force-bearing performance of columns. The test takes the deformation situation and failure mode of the column under axial load as the research object, aiming to determine the bearing capacity and force-bearing situation of the column under axial force. The test schematic diagram is as shown in Figure 1 the figure. The upper and lower two-sided arrows are the loading points. Strain gauges 20 and dial gauges 30 are provided on the column 2. Existing test devices are as shown in Figure 2 the figure. During the test, the column 2 is installed in the reaction frame 1 of the test device. One end of the column 2 is successively provided with a steel column hinge 5, a backing plate 6, a force sensor 4 and a jack 3, and the other end is provided with a steel column hinge 5 and a backing plate 6. The loading jack 3 applies a load, and the deformation situation and failure mode of the column 1 are recorded, and parameters such as the bearing capacity and deformation characteristics of the column 1 are calculated. However, in the experiment, there are the following defects:

[0003] First, the reaction frame 1, the jack 3, the force sensor 4, the backing plate 6, the steel column hinge 5, and the column 1 are all processed in the factory and manually installed together. Due to errors, each section may not be on the same axis. As shown in Figure 3 the figure, the force application line A of the jack and the force application line B of the column are not collinear, which may cause tipping over and the failure of the test;

[0004] Second, when the jack 3 is loaded, due to gravity and ground support force, the axial compression system composed of the jack 3 and the column 1 will not have lateral deviation in the direction perpendicular to the ground;

[0005] Third, after the test installation and debugging, it is impossible to predict whether it will tip over horizontally during loading;

[0006] Fourth, after the installation and debugging, during loading, it is very inconvenient to read the displacement and force.

[0007] Therefore, it is necessary to design a centering structure that can read directly, and judge whether the force application line A of the jack and the force application line B of the column are on the same axis, and is convenient to adjust at the same time. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an eccentricity identification and correction centering device in the axial loading test of columns with a simple structure and convenient operation, which can quickly judge whether the force application line A of the jack and the force application line B of the column are on the same axis, and is convenient to adjust to ensure the normal operation of the test.

[0009] The technical solution adopted by the present invention to solve the above technical problems is as follows: An eccentric recognition and alignment correction device in the axial loading test of a column, which includes a column body for the test, a jack, a steel column hinge, a backing plate and a force sensor. The column body is horizontally installed in the reaction frame. The front and rear ends of the column body are respectively abutted and positioned against the backing plate through the steel column hinge. The other side of the rear backing plate abuts against the inner wall of the reaction frame, and the front backing plate abuts against the top telescopic section of the jack. The bottom of the jack abuts against the inner wall of the reaction frame. It is characterized in that: a scale line for intuitively viewing the output displacement of the jack is arranged along the length direction on the telescopic section of the jack. Four force sensors are arranged at the bottom of the jack. Manual screw propulsion devices are provided on the left and right sides of the jack, which can clamp the jack and horizontally fine-tune the position of the jack.

[0010] Further, the reaction frame is a rigid adjustable steel reaction frame, which includes left and right columns and front and rear cross beams. The left and right columns and the front and rear cross beams enclose a rectangular structure.

[0011] Further, the manual screw propulsion devices are two left and right symmetrically arranged. The manual screw propulsion device includes a horizontally arranged screw rod. The inner end of the screw rod is welded with a side T-shaped support plate that abuts against the side of the jack. A through threaded hole matched with the screw rod is opened on the column of the reaction frame. The outer end of the screw rod passes through the threaded hole, and a manual crank is provided at the outer end of the screw rod.

[0012] Further, the column body is arranged at the middle position in the reaction frame along the length direction. The steel column hinge is sleeved at the end position of the column body and fixed to the column body through bolts. A sharp corner protrudes in the middle of the outer end face of the steel column hinge. The backing plate is a steel backing plate, and a positioning notch corresponding to the sharp corner is recessed on the backing plate. The steel column hinge is positioned with the backing plate through the cooperation of the sharp corner and the positioning notch. A screw rod is welded on the rear backing plate. During the test, the rear backing plate is fixed at the middle position of the rear cross beam of the reaction frame through bolts, and the front backing plate is welded and fixed to the end plate at the end of the telescopic section of the jack.

[0013] Further, the four force sensors are circumferentially and evenly spaced and installed at the left and right, upper and lower positions at the bottom of the jack. A display screen for displaying the readings of the force sensors is provided on the upper end face of the jack. When the readings of the two left and right force sensors are different, it is necessary to adjust the position of the jack to be centered with the column body through the manual screw propulsion device.

[0014] Finally, the material of the column body is reinforced concrete or steel section.

[0015] Compared with the prior art, the advantages of the present invention are as follows: scale lines are provided on the telescopic section of the jack, so that the displacement output by the jack can be intuitively viewed; hand-cranked screw propulsion devices are provided on the left and right sides of the jack, so that the position of the jack can be horizontally fine-tuned; four force sensors are arranged at the bottom of the jack, and a display screen is provided, so that the magnitude of the output force can be directly seen, and whether the force application line of the jack and the force application line of the column are aligned can be judged according to the force reading. The structure of the present invention is simple and reasonable, and the operation is convenient. During the experiment, not only can the data of displacement and force during loading be intuitively seen, but also whether the alignment is achieved can be quickly judged, effectively avoiding rollover due to misalignment and improving the accuracy of the test. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the loading and test point of the axially compressed test of the structural column;

[0017] Figure 2 It is a schematic structural diagram of the test device before improvement;

[0018] Figure 3 It is Figure 2 It is a schematic structural diagram of the column after being loaded with force during the experiment;

[0019] Figure 4 It is a schematic structural diagram of the test device of the embodiment of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the jack;

[0021] Figure 6 It is a schematic diagram of the distribution of the force sensors. Detailed Embodiment

[0022] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0023] As Figure 4 , 5 , shown in 6, an eccentric recognition and correction alignment device in the axially loaded test of a column includes a column body 2 for the test, a jack 3, a steel column hinge 5, a backing plate 6 and a force sensor 4. The column body 2 is horizontally installed in the reaction frame 1. The front and rear ends of the column body 2 are respectively abutted and positioned with the backing plate 6 through the steel column hinge 5. The other side of the rear backing plate 62 abuts against the inner wall of the reaction frame, and the front backing plate 61 abuts against the top telescopic section 31 of the jack 3. The bottom of the jack 3 abuts against the inner wall of the reaction frame 1. Scale lines 32 for intuitively viewing the displacement output by the jack 3 are arranged along the length direction on the telescopic section 31 of the jack 3. Four force sensors 4 are arranged at the bottom of the jack 3. Hand-cranked screw propulsion devices 7 that can clamp the jack 3 and horizontally fine-tune the position of the jack 3 are arranged on the left and right sides of the jack 3.

[0024] The specific structure is as follows: The reaction frame 1 is a rigid adjustable steel reaction frame. The reaction frame 1 includes left and right columns 11 and 12, and front and rear cross beams 13 and 14. The left and right columns 11 and 12, and the front and rear cross beams 13 and 14 enclose a rectangular structure. There are two symmetrically arranged left and right hand-operated screw propulsion devices 7. The hand-operated screw propulsion device 7 includes a horizontally arranged screw rod 71. The inner end of the screw rod 71 is welded with a side T-shaped support plate 72 which abuts against the side surface of the jack 3. Threaded holes penetrating through and matching with the screw rod 71 are provided on the columns 11 and 12 of the reaction frame 1. The outer end of the screw rod 71 passes through the threaded hole, and a manual crank 73 is provided at the outer end of the screw rod 71.

[0025] The cross-section of the column body 2 is rectangular. The material of the column body 1 is reinforced concrete or steel. In this embodiment, it is a reinforced concrete column body. The column body 1 is arranged at the middle position inside the reaction frame 1 along the length direction. The steel column hinge 5 is sleeved at the end position of the column body 1 and fixed to the column body 1 by bolts. A pointed corner 51 protrudes from the middle of the outer end face of the steel column hinge 5. The backing plates 61 and 62 are steel backing plates. Positioning notches 6a corresponding to the pointed corner 51 are recessed on the backing plates 61 and 62. The steel column hinge 5 is positioned with the backing plates 61 and 62 through the cooperation of the pointed corner 51 and the positioning notches 6a. Among them, a screw rod 621 is welded on the rear backing plate 62. During the test, the rear backing plate 62 is fixed at the middle position of the rear cross beam 14 of the reaction frame 1 by bolts, and the front backing plate 61 is welded and fixed to the end plate at the end of the telescopic section 31 of the jack 3. Four force sensors 4 are evenly spaced circumferentially and installed at the left and right, upper and lower positions at the bottom of the jack 3. A display screen for displaying the readings of the force sensors 4 is provided on the upper end face of the jack 3, which can directly display the magnitude of the output force. According to the mechanical principle, when the force application line A of the jack and the force application line B of the column body are not collinear, the side jack 3 bears a bending moment, and the readings of the left and right two force sensors 4 will be different. Because when loading, if the readings of the left and right two force sensors 4 are different, it means that the position of the jack 3 needs to be finely adjusted through the hand-operated screw propulsion device to make each section aligned.

[0026] Since scale lines 32 are provided on the telescopic section 31 of the jack 3, the displacement output by the jack 3 can be directly viewed. Hand-operated screw propulsion devices 7 are arranged on the left and right sides of the jack 3, and the position of the jack 7 can be horizontally finely adjusted. Four force sensors 4 are arranged at the bottom of the jack 3, and a display screen 33 is provided, so that the magnitude of the output force can be directly seen, and it can be judged whether the force application line of the jack and the force application line of the column body are aligned according to the readings of the force. The present invention can not only directly view the data of displacement and force during loading, but also quickly judge whether it is aligned, effectively avoiding rollover due to misalignment and improving the accuracy of the test.

[0027] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An eccentric recognition and correction centering device in the axial loading test of a column, comprising a column body for the test, a jack, a steel column hinge, a backing plate and a force sensor. The column body is horizontally installed in a reaction frame. The front and rear ends of the column body are respectively abutted and positioned against the backing plates through the steel column hinges. The other side of the rear backing plate abuts against the inner wall of the reaction frame, and the front backing plate abuts against the top telescopic section of the jack. The bottom of the jack abuts against the inner wall of the reaction frame. It is characterized in that: The telescopic section of the jack is provided with scale lines along the length direction for visually observing the output displacement of the jack. Four force sensors are arranged at the bottom of the jack. Hand-cranked screw propulsion devices capable of clamping the jack and horizontally fine-tuning the position of the jack are provided on the left and right sides of the jack.

2. The eccentric identification and correction centering device according to claim 1, wherein: The reaction frame is a rigid adjustable steel reaction frame, which includes left and right columns and front and rear cross beams. The left and right columns and the front and rear cross beams enclose a rectangular structure.

3. The eccentric recognition and alignment correction device according to claim 1, wherein: The hand-cranked screw propulsion devices are two symmetrically arranged left and right ones. The hand-cranked screw propulsion device includes a horizontally arranged screw rod. A side T-shaped support plate is welded to the inner end of the screw rod and abuts against the side surface of the jack. Through holes matching the screw rod are opened on the columns of the reaction frame. The outer end of the screw rod passes through the through hole, and a manual crank is provided at the outer end of the screw rod.

4. The eccentric recognition and alignment correction device according to claim 1, characterized in that: The column body is arranged at the middle position inside the reaction frame along the length direction. The steel column hinge is sleeved at the end of the column body and fixed to the column body by bolts. A sharp corner protrudes from the middle of the outer end face of the steel column hinge. The backing plate is a steel backing plate, and a positioning notch corresponding to the sharp corner is recessed on the backing plate. The steel column hinge is positioned with the backing plate through the cooperation of the sharp corner and the positioning notch. Among them, a screw rod is welded to the rear backing plate. During the test, the rear backing plate is fixed at the middle position of the rear cross beam of the reaction frame by bolts, and the front backing plate is welded and fixed to the end plate at the end of the telescopic section of the jack.

5. The eccentric recognition and correction centering device according to claim 1, characterized in that: The four force sensors are evenly installed at the left and right, upper and lower positions at the bottom of the jack at circumferential intervals. A display screen for displaying the readings of the force sensors is provided on the upper end face of the jack. When there is a difference in the readings of the two left and right force sensors, the position of the jack needs to be adjusted to be centered with the column body through the hand-cranked screw propulsion device.

6. The eccentric identification and alignment correction device according to any one of claims 1 to 5, characterized in that: The material of the column body is reinforced concrete or steel section.

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