Frame internal force teaching experiment table

Abstract

This experimental platform for teaching internal forces using a rigid frame relates to the field of simulator technology for educational purposes. It includes: an experimental platform frame; a first rigid frame, mounted on the experimental platform frame, comprising a first rigid frame horizontal member, a first pivotal vertical member, and a first sliding vertical member; the first pivotal vertical member is pivotally connected to a chassis, and the first sliding vertical member is slidably connected to the experimental platform frame; both ends of the first rigid frame horizontal member are fixedly connected to the upper ends of the first pivotal vertical member and the first sliding vertical member, respectively; a first pressurizing device, mounted on the experimental platform frame; a second pressurizing device, mounted on the experimental platform frame; and a data acquisition module, mounted on the experimental platform frame. A first strain data measurement module is mounted on the first rigid frame and electrically connected to the data acquisition module. Through the rigid frame structure capable of applying loads, it simulates real stress conditions, providing a dynamic and visualized experimental platform for structural mechanics teaching, significantly enhancing students' understanding of internal force distribution.

Description

Technical Field

[0001] This utility model relates to the field of simulator technology for teaching purposes, and in particular to a teaching experimental platform for rigid frame internal forces. Background Technology

[0002] In the teaching practice of structural mechanics and engineering design, the internal force distribution and deformation characteristics of rigid frame structures are core teaching content. Traditional teaching generally relies on theoretical derivation, numerical simulation, or simple model demonstrations, which can only show simplified states under specific loads and cannot simulate complex working conditions. It also lacks intuitive, quantifiable, and operable experimental methods. Students find it difficult to deeply understand the mechanical response laws of rigid frames under complex loads through static models or abstract equations, especially the internal force transmission at nodes and the dynamic relationship between member bending and constraint reactions.

[0003] In existing technologies, equipment lacks modules for real-time measurement of multi-directional loads (such as vertical pressure and horizontal thrust) and corresponding internal forces, making it impossible to quantify and demonstrate the force transmission patterns. This makes it difficult for students to understand the generation mechanism of constraint reaction forces at nodes. In actual engineering, rigid frames are often in complex stress environments (such as building frames simultaneously bearing gravity and horizontal seismic forces), but existing equipment cannot apply multi-directional loads in a coordinated manner, resulting in a disconnect between experimental scenarios and actual engineering practices.

[0004] To address the aforementioned issues, this invention provides a teaching experimental platform capable of applying multi-directional loads and possessing real-time data acquisition and visualization functions, thereby enhancing students' understanding of the internal force distribution of rigid frames and filling the gap in existing technologies for dynamic experimental demonstrations and quantitative analysis. Utility Model Content

[0005] The technical problem this invention aims to solve is how to provide a teaching experimental platform with multiple rigid configurations that is easy to observe.

[0006] To achieve the above objectives, according to one aspect of the utility model, a rigid frame internal force teaching experimental platform is provided, comprising: an experimental platform frame including a base, a vertical column perpendicular to the base, and a top plate disposed at the top of the vertical column; a first rigid frame disposed on the base, including a first rigid frame crossbar, a first pivotal vertical bar, and a first sliding vertical bar; the first pivotal vertical bar is pivotally connected to the base, and the first sliding vertical bar is slidably connected to the base; both ends of the first rigid frame crossbar are fixedly connected to the upper ends of the first pivotal vertical bar and the first sliding vertical bar, respectively; a first pressurizing device disposed on the top plate for applying vertical pressure above the first rigid frame crossbar; a second pressurizing device disposed on the vertical column for applying horizontal pressure to the first pivotal vertical bar; and a data acquisition module disposed on the experimental platform frame, wherein a first strain data measurement module is disposed on the first rigid frame, and the first strain data measurement module is electrically connected to the data acquisition module.

[0007] As a preferred embodiment of the above technical solution, it further includes: a second rigid frame, mounted on the chassis, comprising a second rigid frame vertical member and a second rigid frame horizontal member; the lower end of the second rigid frame vertical member is fixedly connected to the chassis; one end of the second rigid frame horizontal member is fixedly connected to the upper end of the second rigid frame vertical member, and the other end is a free end; a third pressurizing device, mounted on the top plate, for applying vertical pressure to the upper part of the second rigid frame horizontal member; a fourth pressurizing device, mounted on the vertical column, for applying horizontal pressure to the second rigid frame vertical member; and a second strain data measurement module is mounted on the second rigid frame, the second strain data measurement module being electrically connected to the data acquisition module.

[0008] As a preferred embodiment of the above technical solution, it further includes: a first sensor disposed between the first pressurizing device and the first rigid frame crossbar; a second sensor disposed between the second pressurizing device and the first pivotal vertical bar; a third sensor disposed between the third pressurizing device and the second rigid frame crossbar; and a fourth sensor disposed between the fourth pressurizing device and the second rigid frame vertical bar.

[0009] As a preferred embodiment of the above technical solution, a transverse slide rail is provided on the chassis, and a slider is provided at the lower end of the first sliding vertical rod. The transverse slide rail and the slider cooperate to realize the sliding connection.

[0010] As a preferred embodiment of the above technical solution, the first pressurizing device, the second pressurizing device, the third pressurizing device and the fourth pressurizing device are hand-cranked screw jacks.

[0011] As a preferred embodiment of the above technical solution, it further includes: a pressure monitoring module, which is electrically connected to the first sensor, the second sensor, the third sensor and the fourth sensor.

[0012] As a preferred embodiment of the above technical solution, the first strain data measurement module is provided at the junction of the first pivotal vertical member and the first rigid frame horizontal member; the first strain data measurement module is provided at the contact point between the first rigid frame horizontal member and the first pressurizing device.

[0013] As a preferred embodiment of the above technical solution, a second strain data measurement module is provided at the junction of the second rigid frame vertical member and the second rigid frame horizontal member; a second strain data measurement module is also provided at the connection between the second rigid frame vertical member and the chassis.

[0014] As a preferred embodiment of the above technical solution, it also includes an information display module, which is detachably mounted on the chassis and connected to the data acquisition module via a wireless communication module.

[0015] In summary, this utility model has the following advantages: 1. This utility model uses a rigid frame structure model that can be subjected to real engineering loads to simulate the stress state in actual working conditions, providing a dynamic and visual experimental platform for structural mechanics teaching, and significantly enhancing students' understanding of the distribution law of internal forces; 2. This utility model integrates two typical structures, portal frame and L-shaped frame, covering core structural mechanics experimental scenarios; in particular, through the coordinated loading of the first and second pressurizing devices, or the coordinated loading of the third and fourth pressurizing devices, it can accurately simulate the composite stress state faced by the frame in engineering practice. 3. This utility model enables real-time monitoring of the applied load values, facilitating immediate observation of the specific effects of different load levels on the internal forces and deformations of the rigid frame structure during teaching demonstrations; the final experimental data, after being analyzed and calculated by the data acquisition module, are clearly displayed by the information display module, showing the experimental process and results.

[0016] Further or other beneficial effects will be discussed in the embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front view of the structure of this utility model; Figure 3 for Figure 1 Enlarged view of area A; Among them, 101-chassis, 102-vertical column, 103-top plate, 201-first rigid frame horizontal bar, 202-first pivotal vertical bar, 203-first sliding vertical bar, 301-first pressurizing device, 302-first sensor, 303-second pressurizing device, 304-second sensor, 401-second rigid frame vertical bar, 402-second rigid frame horizontal bar, 501-third pressurizing device, 502-third sensor, 503-fourth pressurizing device, 504-fourth sensor, 600-monitoring module, 700-data acquisition module, 801-first strain data measurement module, 802-second strain data measurement module, and 900-information display module. Detailed Implementation

[0018] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0019] The present invention will be further explained below with reference to the embodiments: Example

[0020] A rigid frame internal force teaching experimental platform, used for experimental teaching, includes an experimental frame, a first rigid frame, a first pressurizing device 301, and a second pressurizing device 303. The experimental frame is the basic frame structure of the entire experimental platform, including a base 101, vertical columns 102 perpendicular to the base 101, and a top plate 103 located at the top of the vertical columns 102. The first rigid frame is mounted on the base 101 and includes a crossbar and two vertical bars. The lower ends of the two vertical bars are connected to the base 101. The rigid frame vertical members are divided into a first pivotal vertical member 202 and a first sliding vertical member 203. The first pivotal vertical member 202 is pivotally connected to the base plate 101, and the second sliding vertical member is slidably connected to the base plate 101. The two ends of the first rigid frame horizontal member 201 are respectively fixedly connected to the upper ends of the two first rigid frame vertical members. The first pressurizing device 301 is set on the top plate 103 and is used to apply vertical pressure to the top of the first rigid frame horizontal member 201. The second pressurizing device 303 is set on the vertical column 102 and is used to apply horizontal pressure to the surface of the first pivotal vertical member 202.

[0021] A transverse slide rail 104 is provided on the chassis 101, and a slider 204 is provided at the lower end of the first sliding vertical rod 203. Specifically, the transverse slide rail 104 is a guide block with oblong holes on both sides of the slider 204, and the slider 204 is a sliding wheel provided in the two oblong holes. Based on the above configuration, the lower end of the first sliding vertical rod 203 can only move laterally (X-axis) within the transverse slide rail. The chassis 101 is provided with a rotating pin seat 105, in which a rotating pin 205 is pivotally connected; the rotating pin 205 passes through the lower end of the first pivotally connected vertical rod 202, so that the first pivotally connected vertical rod 202 and the chassis 101 form a pivotal constraint.

[0022] The data acquisition module 700 is mounted on the experimental platform frame. The first strain data measurement module 801 is mounted on the first rigid frame and is electrically connected to the data acquisition module 700.

[0023] This experimental setup can be used for demonstrations and experiments on portal frame structures. During operation, the first pressurizing device 301 applies a vertical load to the crossbar of the portal frame, simultaneously triggering the pivoting and sliding of the vertical bar; the second pressurizing device 303 applies a horizontal load to simulate wind load or seismic force. By applying the two loads independently or in combination, and transmitting the data to the data acquisition module 700 via the first strain data measurement module 801, the bending of the crossbeam, the reaction force at the bottom of the column, and the strain data at the nodes are displayed in real time, providing a visual demonstration of the redistribution of internal forces in statically determinate structures.

[0024] The rigid frame internal force teaching experimental platform in this embodiment also includes a second rigid frame, a third pressurizing device 501, and a fourth pressurizing device 503. The second rigid frame is mounted on the chassis 101 and includes a second rigid frame vertical rod 401 and a second rigid frame horizontal rod 402. The lower end of the second rigid frame vertical rod 401 is fixedly connected to the chassis 101, and one end of the second rigid frame horizontal rod 402 is fixedly connected to the upper end of the second rigid frame vertical rod 401, while the other end is a free end. The second rigid frame horizontal rod 402 is arranged similarly to a cantilever beam. The third pressurizing device 501 is mounted on the top plate 103 and is used to apply vertical pressure to the upper part of the second rigid frame horizontal rod 402. The fourth pressurizing device 503 is mounted on the vertical column 102 and is used to apply horizontal pressure to the surface of the second rigid frame vertical rod 401. A second strain data measurement module 802 is mounted on the second rigid frame and is electrically connected to the data acquisition module 700.

[0025] The above structure is an "L"-shaped rigid frame. The "L"-shaped rigid frame demonstrates the fixed-end bending moment effect under cantilever end load, forming a constraint condition comparison with the portal rigid frame, which deepens students' understanding of the influence of boundary conditions.

[0026] To elaborate on the measurement locations of the strain data measurement module, on the first rigid frame, a first strain data measurement module 801 is installed at the junction of the first pivotal vertical member 202 and the first rigid frame horizontal member 201, and also at the contact point between the first rigid frame horizontal member 201 and the first pressurizing device 301 (located on the first rigid frame horizontal member 201). On the second rigid frame, a second strain data measurement module 802 is installed at the junction of the second rigid frame vertical member 401 and the second rigid frame horizontal member 402, and also at the connection point between the second rigid frame vertical member 401 and the chassis 101 (located on the second rigid frame vertical member 401). The system covers the mechanically sensitive areas of the rigid frame structure, accurately corresponds to the teaching experiment objectives, and meets the selection logic of key measurement points in engineering monitoring specifications.

[0027] The rigid frame internal force teaching experimental platform of this embodiment also includes a first sensor 302, disposed between the first pressurizing device 301 and the first rigid frame crossbar 201; a second sensor 304, disposed between the second pressurizing device 303 and the first pivotal vertical bar 202; a third sensor 502, disposed between the third pressurizing device 501 and the second rigid frame crossbar 402; and a fourth sensor 504, disposed between the fourth pressurizing device 503 and the second rigid frame vertical bar 401. The aforementioned pressure sensors provide pressure data. In addition, the experimental platform frame of this embodiment is also equipped with a pressure monitoring module 600, which is electrically connected to the first sensor 302, the second sensor 304, the third sensor 502, and the fourth sensor 504. The pressure monitoring module 600 is used to detect the magnitude of the force applied by the pressurizing device. Furthermore, the first sensor 302 forms a pressure-driven abutment contact with the surface of the first rigid frame crossbar 201; the second sensor 304 forms a pressure-driven abutment contact with the surface of the first pivotal vertical bar 202; the third sensor 502 forms a pressure-driven abutment contact with the surface of the second rigid frame crossbar 402; and the fourth sensor 504 forms a pressure-driven abutment contact with the surface of the second rigid frame vertical bar 401. In other words, the pressure sensors are not rigidly fixed to the members of the rigid frame or otherwise mechanically connected. This eliminates the interference of the connection structure on the internal force measurement, ensuring that the data accurately reflects the stress state of the rigid frame.

[0028] The first pressurizing device 301, the second pressurizing device 303, the third pressurizing device 501, and the fourth pressurizing device 503 all adopt hand-cranked screw jacks. The operator raises and lowers the drive shaft by rotating the rotating disc of the hand-cranked screw jack, thereby pressurizing the corresponding position.

[0029] It also includes an information display module 900, which is detachably mounted on the chassis 101 and connected to the data acquisition module 700 via a wireless communication module. The information display module 900 can be a mobile phone, tablet, or laptop.

[0030] The experimental procedure is as follows: S1: The first pressurizing device 301 or the second pressurizing device 303 applies pressure to the first rigid frame; the third pressurizing device 501 or the fourth pressurizing device 503 applies pressure to the second rigid frame; observe the data of the pressure monitoring module 600; S2: The first rigid frame tends to move, and the second rigid frame tends to deform. The first strain data measurement module 801 or the second strain data measurement module 802 collects data and sends it to the data acquisition module 700. S3: The data acquisition module 700 transmits data to the cloud data platform wirelessly, and after analysis and calculation, it transmits the results wirelessly to the information display module 900 for display.

[0031] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0032] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A teaching experiment table for internal forces of rigid frame, characterized in that, include: The experimental platform frame includes a base (101), a vertical column (102) perpendicular to the base (101), and a top plate (103) disposed at the top of the vertical column (102). A first rigid frame, mounted on the chassis (101), includes a first rigid frame crossbar (201), a first pivotal vertical bar (202), and a first sliding vertical bar (203); the first pivotal vertical bar (202) is pivotally connected to the chassis (101), and the first sliding vertical bar (203) is slidably connected to the chassis (101); both ends of the first rigid frame crossbar (201) are fixedly connected to the upper ends of the first pivotal vertical bar (202) and the first sliding vertical bar (203), respectively. The first pressurizing device (301) is disposed on the top plate (103) and is used to apply vertical pressure to the top of the first rigid frame crossbar (201); The second pressurizing device (303) is disposed on the vertical column (102) and is used to apply horizontal pressure to the first pivotal vertical rod (202); A data acquisition module (700) is mounted on the experimental platform frame. A first strain data measurement module (801) is mounted on the first rigid frame. The first strain data measurement module (801) is electrically connected to the data acquisition module (700).

2. The rigid frame internal force teaching experimental platform according to claim 1, characterized in that, Also includes: The second rigid frame is mounted on the chassis (101) and includes a second rigid frame vertical member (401) and a second rigid frame horizontal member (402). The lower end of the second rigid frame vertical rod (401) is fixedly connected to the chassis (101); One end of the second rigid frame horizontal bar (402) is fixedly connected to the upper end of the second rigid frame vertical bar (401), and the other end is a free end; The third pressurizing device (501) is disposed on the top plate (103) and is used to apply vertical pressure to the top of the second rigid frame crossbar (402); The fourth pressurizing device (503) is installed on the vertical column (102) and is used to apply horizontal pressure to the second rigid frame vertical member (401); The second rigid frame is provided with a second strain data measurement module (802), which is electrically connected to the data acquisition module (700).

3. The rigid frame internal force teaching experiment table according to claim 2, characterized in that, It also includes: a first sensor (302) disposed between the first pressurizing device (301) and the first rigid frame crossbar (201); a second sensor (304) disposed between the second pressurizing device (303) and the first pivotal vertical bar (202); a third sensor (502) disposed between the third pressurizing device (501) and the second rigid frame crossbar (402); and a fourth sensor (504) disposed between the fourth pressurizing device (503) and the second rigid frame vertical bar (401).

4. The rigid frame internal force teaching experiment table according to claim 1, characterized in that: A transverse slide rail (104) is provided on the chassis (101), and a slider (204) is provided at the lower end of the first sliding vertical rod (203). The transverse slide rail (104) and the slider (204) cooperate to realize the sliding connection.

5. The rigid frame internal force teaching experiment table according to claim 3, characterized in that: The first pressurizing device (301), the second pressurizing device (303), the third pressurizing device (501) and the fourth pressurizing device (503) are hand-cranked screw jacks.

6. The rigid frame internal force teaching experiment table according to claim 3, characterized in that, Also includes: The pressure monitoring module (600) is electrically connected to the first sensor (302), the second sensor (304), the third sensor (502), and the fourth sensor (504).

7. The rigid frame internal force teaching experiment table according to claim 1, characterized in that, The first strain data measurement module (801) is provided at the junction of the first pivotal vertical bar (202) and the first rigid frame horizontal bar (201); the first strain data measurement module (801) is provided at the contact point between the first rigid frame horizontal bar (201) and the first pressurizing device (301).

8. The rigid frame internal force teaching experiment table according to claim 2, characterized in that, The second strain data measurement module (802) is provided at the junction of the second rigid frame vertical bar (401) and the second rigid frame horizontal bar (402); the second strain data measurement module (802) is provided at the connection between the second rigid frame vertical bar (401) and the chassis (101).

9. The rigid frame internal force teaching experiment table according to claim 1, characterized in that: It also includes an information display module (900), which is detachably mounted on the chassis (101) and connected to the data acquisition module (700) via a wireless communication module.

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