A hinge support device for air-supported simply supported beam axial compression instability experimental test

Abstract

The application discloses a hinge support device for an inflated simply supported beam axial compression instability experimental test, which comprises a bottom support, a first nut support structure is fixedly connected to the upper surface of the bottom support, a bearing support is fixedly connected to the upper surface of the first nut support structure, a sample tray is movably connected to the inside of the bearing support through a bearing, and a sample tray baffle is fixedly connected to the side surface of the sample tray; an elastic rope is fixedly connected to the edge of the sample tray, the end of the elastic rope away from the sample tray is fixedly connected with the bottom support, and the upper surface of the sample tray is used for placing an inflated simply supported beam. The sample tray is used for placing an inflated column sample, and the bearing is connected with the bearing support. The constraint effect of the elastic rope applied to the sample tray can control the rotation of the inflated column sample in a preset rotation direction during the experiment.

Description

Technical Field

[0001] This invention relates to the field of air-supported simply supported beam axial testing technology, and particularly to a hinged support device for testing the axial instability of air-supported simply supported beams. Background Technology

[0002] Inflatable membrane structures are characterized by their light weight, foldability, ease of deployment, and low manufacturing cost, making them widely used in civil engineering and aerospace fields. Among them, the inflatable column is a typical inflatable membrane structure, often used as a basic load-bearing component in various types of inflatable membrane structures. The inflatable simply supported beam, a type of inflatable column supported at both ends by hinged supports, has significant research value and importance in both theoretical and engineering applications.

[0003] Current experiments on inflatable simply supported beams have some shortcomings, mainly in two aspects: 1) Low precision of the hinged support. This is mainly manifested in inflexible rotation or excessive clearance; 2) Low repeatability of the experiment. The deformation of an inflatable simply supported beam under axial compression is essentially a phenomenon of compressive instability in a thin-walled structure, which is difficult to predict. Therefore, initial disturbances are artificially applied during the experiment to achieve the experimental purpose. However, the method, magnitude, time, and location of the initial disturbance are difficult to guarantee consistency in each experiment, resulting in low repeatability. Therefore, designing a high-precision and controllable hinged support is crucial. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a hinged support device for testing the axial compression instability of an inflatable simply supported beam. An inflatable column specimen is placed on a specimen tray and connected to a bearing support via a bearing. An elastic rope applied to the specimen tray provides constraint, allowing the inflatable column specimen to rotate in a predetermined direction during the experiment.

[0005] The present invention also provides a hinged support device for axial compression instability testing of an inflatable simply supported beam, comprising: a bottom support, a first nut support structure fixedly connected to the upper surface of the bottom support, a bearing support fixedly connected to the upper surface of the first nut support structure, a sample tray movably connected to the interior of the bearing support via a bearing, a sample tray baffle fixedly connected to the side surface of the sample tray; an elastic rope fixedly connected to the edge of the sample tray, the end of the elastic rope away from the sample tray being fixedly connected to the bottom support, and an inflatable simply supported beam placed on the upper surface of the sample tray.

[0006] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided, wherein the bottom support has a weight reduction hole inside.

[0007] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided, wherein the first nut support structure is fixedly connected to the bearing support by bolts, and the top of the bearing support is provided with an opening, which is controlled by the bearing support bolts.

[0008] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided, wherein a first elastic rope interface and a second elastic rope interface are symmetrically distributed around the edge of the sample tray, and the line connecting the first elastic rope interface and the second elastic rope interface and the axis of rotation are perpendicular to each other.

[0009] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided, wherein bottom support baffles are fixedly connected to both sides of the lower surface of the bottom support, and the surface of the bottom support is provided with a third elastic rope interface and a fourth elastic rope interface.

[0010] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided, wherein the elastic rope is located between the first elastic rope interface and the third elastic rope interface, and between the second elastic rope interface and the fourth elastic rope interface.

[0011] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided, wherein a second nut support structure is fixedly connected to the outer surface of the sample tray baffle, and a first nut is provided inside the second nut support structure.

[0012] According to the present invention, a hinge support device for testing the axial compression instability of an inflatable simply supported beam is provided, wherein the line connecting the second nut support structure is the rotation axis of the hinge support.

[0013] According to the present invention, a hinged support device for axial compression instability testing of an inflatable simply supported beam is provided. The first nut support structure has a second nut fastened inside. There are four first nut support structures in total, and the four first nut support structures are symmetrically fixed on the bottom support.

[0014] Beneficial effects

[0015] 1. This invention uses a sample tray to hold an inflatable column sample, and connects it to a bearing support via a bearing. An elastic rope applied to the sample tray provides constraint, allowing the inflatable column sample to rotate in a predetermined direction during the experiment.

[0016] 2. This invention features high precision and controllable rotation direction, thereby improving the accuracy and repeatability of experiments. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is an overall structural diagram of the hinged support device for the experimental testing of axial compression instability of an inflatable simply supported beam according to the present invention.

[0019] Figure 2 This is a structural diagram of the sample tray of the hinged support device for the experimental testing of axial compression instability of an inflatable simply supported beam according to the present invention.

[0020] Figure 3 This is a structural diagram of the bottom support of the hinged support device for axial compression instability testing of an inflatable simply supported beam according to the present invention.

[0021] Figure 4 This is a structural diagram of the bearing support of the hinge support device for the axial compression instability test of an inflatable simply supported beam according to the present invention.

[0022] Figure 5 This is a diagram showing the equilibrium state of the tension rope of the hinge support device used in the experimental test of axial compression instability of an inflatable simply supported beam according to the present invention.

[0023] Figure 6 This is a diagram showing the shortened state of the tension rope in the hinge support device of the present invention used for the experimental testing of axial compression instability of an inflatable simply supported beam.

[0024] Legend:

[0025] 1. First elastic rope interface; 2. Sample tray; 3. Bearing support; 4. Bolt; 5. Elastic rope; 6. Bottom support; 7. Bottom support baffle; 8. First nut support structure; 9. Second nut support structure; 10. First nut; 11. Second elastic rope interface; 12. Third elastic rope interface; 13. Fourth elastic rope interface; 14. Second nut; 15. Bearing; 16. Bearing support bolt. Detailed Implementation

[0026] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0027] Reference Figure 1 This invention discloses a hinged support device for testing the axial compression instability of an inflatable simply supported beam. The device includes a sample tray 2 and two bearing supports 3 fastened together by bolts 4 and nuts. The sample tray 2 can rotate with the bearings 15. The bearing supports are tightly fixed to a bottom support 6 by bolts 4. The sample tray 2 and the bottom support 6 are connected by an elastic rope 5.

[0028] Reference Figure 2Two symmetrically distributed sample tray baffles and symmetrically distributed first elastic rope interfaces 1 and second elastic rope interfaces 11 are installed circumferentially along the edge of the sample tray 2. Nut support structures 9 are provided on the outer surface of the thin-walled baffles, and nuts 10 are fastened inside them. The line connecting the two nut support structures 9 is the pivot axis of the hinge support, and the pivot axis connecting the first elastic rope interface 1 and the second elastic rope interface 11 is perpendicular to each other.

[0029] refer to Figure 3 The bottom support 6 has three holes to create weight-reducing holes, which saves material while ensuring structural integrity. Two bottom support baffles 7 are located at the two ends along the length. A third elastic rope interface 12 and a fourth elastic rope interface 13 are located on the axis of symmetry along the length. Nuts 14 are fastened inside the nut support structure 8, of which four are symmetrically fixed to the bottom support.

[0030] refer to Figure 4 The bearing 15 is placed inside the cylindrical guide rail of the bearing support 3. The position is adjusted so that the surface of the bearing 15 coincides with the surface of the bearing support 3. The bolt 15 is tightened so that the bearing 15 and the bearing support are in close contact to form a substructure, ensuring that the two do not move relative to each other.

[0031] Reference Figures 5-6 When the sample is not installed, the elastic rope 5 maintains its original length, and the sample tray 2 tilts due to the constraint of the elastic rope 5. After the sample is installed, at the initial moment of the experiment, the sample tray 5 will return to its tilted position and remain horizontal. At this time, the elastic rope 5 has its maximum elongation and therefore its maximum elastic tension. This maximum elastic tension can be regarded as the initial disturbance to the sample. To reduce the influence of the initial disturbance on the experiment, the maximum tension should be controlled not to exceed 0.5 N.

[0032] According to the principles of mechanics, the effect of the tension in the elastic rope 5 on the rotating shaft is equivalent to the bending moment around the shaft. This equivalent bending moment allows the inflatable cantilever beam to rotate smoothly around the shaft as the compression distance of the universal testing machine changes. As the rotation increases, the spatial distance between the second elastic rope interface 11 and the third elastic rope interface 13 decreases, resulting in a decrease in the elongation of the elastic rope under tension, a decrease in the tension in the elastic rope 5, and thus a reduction in the influence of the elastic rope 5 on the rotation.

[0033] Throughout the rotation, the angle between the elastic rope 5 and the bottom support 6 remains obtuse. The tension in the elastic rope can be decomposed into horizontal and vertical force components. Since the angle is always obtuse, the equivalent bending moments of the two force components always point in the same direction, which has a beneficial effect on the rotation.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hinged support device for testing the axial compression instability of an inflatable simply supported beam, characterized in that, include: The bottom support (6) has a first nut support structure (8) fixedly connected to its upper surface. The first nut support structure (8) has a bearing support (3) fixedly connected to its upper surface. The bearing support (3) has a sample tray (2) movably connected inside its interior via a bearing (15). The sample tray (2) has a sample tray baffle fixedly connected to its side surface. An elastic rope (5) is fixedly connected to the edge of the sample tray (2). The end of the elastic rope (5) away from the sample tray (2) is fixedly connected to the bottom support (6). An inflatable simply supported beam is placed on the upper surface of the sample tray (2). The sample tray (2) is circumferentially equipped with a first elastic rope interface (1) and a second elastic rope interface (11) that are symmetrically distributed. The line connecting the first elastic rope interface (1) and the second elastic rope interface (11) and the axis of rotation are perpendicular to each other. Bottom support baffles (7) are fixedly connected to both sides of the lower surface of the bottom support (6), and the surface of the bottom support (6) is provided with a third elastic rope interface (12) and a fourth elastic rope interface (13). The elastic rope (5) is located between the first elastic rope interface (1) and the third elastic rope interface (12), and between the second elastic rope interface (11) and the fourth elastic rope interface (13).

2. The hinged support device for axial compression instability testing of an inflatable simply supported beam according to claim 1, characterized in that, The bottom support (6) has a weight reduction hole inside.

3. The hinged support device for axial compression instability testing of a simply supported pneumatic beam according to claim 1, characterized in that, The first nut support structure (8) is fixedly connected to the bearing support (3) by bolts (4). The top of the bearing support (3) is provided with an opening, which is controlled by the bearing support bolt (16).

4. The hinged support device for axial compression instability testing of an inflatable simply supported beam according to claim 1, characterized in that, The outer surface of the sample tray baffle is fixedly connected to a second nut support structure (9), and a first nut (10) is provided inside the second nut support structure (9).

5. A hinged support device for axial compression instability testing of a simply supported pneumatic beam according to claim 4, characterized in that, The line connecting the second nut support structure (9) is the rotation axis of the hinge support.

6. A hinged support device for axial compression instability testing of a simply supported pneumatic beam according to claim 1, characterized in that, The first nut support structure (8) is internally fastened with a second nut (14). There are four first nut support structures (8), and the four first nut support structures (8) are symmetrically fixed on the bottom support (6).

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