An experimental device and method for releasing the temperature internal force of a steel structure

Abstract

The present invention provides a test device and a test method for releasing the temperature internal force of a steel structure, belonging to the technical field of engineering structures. The test device for releasing the temperature internal force of the steel structure of the present invention includes: a limiting device, an electro-hydraulic servo actuator, a displacement meter, a thermocouple, a reaction frame and a heating device; the limiting device is used to limit the circumferential direction of the test steel beam, one end of the test steel beam is arranged on the limiting device, and the other end of the test steel beam is arranged on the reaction frame; the electro-hydraulic servo actuator is connected to the test steel beam, the displacement meters are respectively arranged at both ends of the test steel beam and are connected to a controller, and the controller is connected to the electro-hydraulic servo actuator; the thermocouple and the heating device are respectively arranged on the test steel beam. According to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator is the real-time temperature internal force of the steel beam. The displacement can be easily measured by the displacement meter, providing an effective test means for the experimental study of the temperature internal force of the steel structure.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering structures, and particularly to a test device and test method for releasing the temperature internal force of a steel structure. Background Art

[0002] In long-span space structures, industrial plant structures, and some platform structures, due to reasons such as environmental temperature, working temperature, and operation accidents, there are often high temperature differences. When performing structural calculations, this working condition often becomes a controlling working condition, making it very difficult to pass the structural member calculations. This is also a very difficult problem encountered in current steel structure design.

[0003] There are two design strategies in engineering structure design: "resistance" and "release", that is, the guiding ideas of impedance and dredging. For members under high temperature differences, when their forces do not meet the specification requirements, simply increasing the member cross-section cannot solve the problem. The most effective solution is to release its axial force through deformation. If the internal force of the member under temperature difference can be released by the displacement released through the oblong bolt hole, the design of the steel structure will be greatly optimized.

[0004] There is currently not much research on the release of temperature effects by steel structures through oblong bolt holes. In order to understand its working performance and better guide engineering design, it is necessary to carry out relevant experimental research and establish a reasonable simulation method, so as to provide strong support for the project. There is a lack of test devices for the research on the release of temperature effects by steel structures through oblong bolt holes. Summary of the Invention

[0005] The purpose of the present invention is to provide a test device and test method for releasing the temperature internal force of a steel structure, so as to solve the technical problem that there is a lack of a test device for the release of temperature effects by steel structures through oblong bolt holes in the prior art.

[0006] To solve the above technical problem, the first aspect of the present invention proposes a test device for releasing the temperature internal force of a steel structure, and the test device for releasing the temperature internal force of a steel structure includes: a limiting device, an electro-hydraulic servo actuator, a displacement meter, a thermocouple, a reaction frame, and a heating device;

[0007] The limiting device is used to limit the circumferential direction of the test steel beam. One end of the test steel beam is arranged on the limiting device, and the other end of the test steel beam is arranged on the reaction frame;

[0008] The electro-hydraulic servo actuator is connected to the test steel beam. The displacement meters are respectively arranged at both ends of the test steel beam and are connected to a controller, and the controller is connected to the electro-hydraulic servo actuator;

[0009] The thermocouple and the heating device are respectively arranged on the test steel beam.

[0010] In addition, the test device for releasing the temperature internal force of the steel structure according to the present invention may further have the following additional technical features:

[0011] In some embodiments of the present invention, a support frame is provided on the limiting device, and the support frame is sleeved outside the test steel beam.

[0012] In some embodiments of the present invention, two support seats and support members are provided inside the support frame. The two support seats are respectively arranged at the top and bottom of the support frame, and the two support members are arranged at the side of the support frame.

[0013] In some embodiments of the present invention, the sides of the support member and the support seat corresponding to the test steel beam are arcs.

[0014] In some embodiments of the present invention, the heating device is an electromagnetic induction coil. The test steel beam includes a steel beam member, and the electromagnetic induction coil is sleeved outside the steel beam member.

[0015] In some embodiments of the present invention, a heat insulation material layer is further sleeved outside the steel beam member, and the electromagnetic induction coil is located outside the heat insulation material layer.

[0016] In some embodiments of the present invention, a corbel is provided on the reaction frame, and the test steel beam is fixed on the reaction frame through the corbel.

[0017] In some embodiments of the present invention, the displacement gauge includes a loading end displacement gauge and a sliding end displacement gauge. The loading end and sliding end displacement gauges are arranged corresponding to the electro-hydraulic servo actuator, and the sliding end displacement gauge is arranged corresponding to the reaction frame.

[0018] On the other hand, the present invention also proposes a test method for releasing the temperature internal force of the steel structure. The test method for releasing the temperature internal force of the steel structure has the above-mentioned test device for releasing the temperature internal force of the steel structure, and the specific steps are as follows:

[0019] S1. Fix the limiting device and the reaction frame;

[0020] S2. Lift and fix the test steel beam on the limiting device and the reaction frame;

[0021] S3. Fix the electro-hydraulic servo actuator on the test steel beam;

[0022] S4. Install the thermocouple and the displacement gauge. Install the thermocouple on the test steel beam, install the loading end displacement gauge at one end of the test steel beam, install the sliding end displacement gauge at the other end of the test steel beam, and connect the loading end displacement gauge and the sliding end displacement gauge to the controller;

[0023] S5. Install a heating device outside the test steel beam;

[0024] S6. Turn on the device. The controller controls the heating device to turn on and heat the test steel beam. When the thermocouple reads that the temperature of the test steel beam reaches the preset temperature, the controller controls the heating device to turn off;

[0025] S7. Read the values. During the heating process, the controller reads the readings of the displacement gauge at the loading end in real time, and controls the stroke of the electro-hydraulic servo actuator in real time according to the readings of the displacement gauge at the loading end so that the readings of the displacement gauge at the loading end are always controlled at 0 mm, simulating the boundary condition of axial fixation at one end of the steel beam; According to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator is the real-time temperature internal force of the steel beam; Read the readings of the displacement gauge at the sliding end to obtain the displacement values before and after the release of the temperature internal force of the test steel beam.

[0026] In some embodiments of the present invention, it is characterized in that the hoisting of the test steel beam installed with the heating device in the S5 includes the following specific steps:

[0027] S51. Wrap a heat-insulating material layer outside the steel beam member of the test steel beam, and arrange an electromagnetic induction coil outside the heat-insulating material layer.

[0028] Adopting the above technical solution, the present invention has the following beneficial effects:

[0029] The test device for releasing the temperature internal force of the steel structure provided by the present invention, according to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator is the real-time temperature internal force of the steel beam. The measurement of the temperature internal force is simple, has high precision, simple structure and low cost. The displacement is convenient to measure through the displacement gauge, providing an effective test means for the experimental research on the temperature internal force of the steel structure, and having the advantages of convenient use, accurate results and low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 Schematically shows a schematic diagram of a test device for releasing the temperature internal force of a steel structure according to an embodiment of the present invention;

[0032] Figure 2 Schematically shows Figure 1 The cross-sectional view taken along A-A in;

[0033] Figure 3Schematically shows the structural schematic diagram of the limit device in the test device for the release of temperature internal force of the steel structure according to an embodiment of the present invention;

[0034] Figure 4 Schematically shows Figure 3 The cross-sectional view taken along B-B in;

[0035] Figure 5 Schematically shows Figure 4 The cross-sectional view taken along C-C in.

[0036] The reference numerals in the drawings are represented as follows:

[0037] 1: Electro-hydraulic servo actuator; 2: Loading end displacement gauge; 3: Limit device; 4: Test steel beam; 5: Corbel; 6: Thermocouple; 7: Reaction frame; 8: Slip end displacement gauge; 9: Steel beam member; 10: Thermal insulation material layer; 11: Electromagnetic induction coil; 12: Support frame; 13: Support member; 14: Support base. Detailed implementation manners

[0038] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] Next, the present invention will be further explained and described in conjunction with specific implementation manners.

[0042] As shown Figures 1 to 5 In the test device for releasing the temperature internal force of the steel structure in this embodiment, it includes: a limiting device 3, an electro-hydraulic servo actuator 1, a displacement gauge, a thermocouple 6, a reaction frame 7, and a heating device; the limiting device 3 is used to limit the circumferential direction of the test steel beam 4. One end of the test steel beam 4 is arranged on the limiting device 3, and the other end of the test steel beam 4 is arranged on the reaction frame 7; the electro-hydraulic servo actuator 1 is connected to the test steel beam 4. The displacement gauges are respectively arranged at both ends of the test steel beam 4 and are connected to the controller, and the controller is connected to the electro-hydraulic servo actuator 1; the thermocouple 6 and the heating device are respectively arranged on the test steel beam 4.

[0043] Among them, the limiting device 3 is processed from a steel plate, encloses the test steel beam 4 to limit the lateral deformation of the test steel beam 4, and the limiting device 3 itself is fixed on the ground.

[0044] When the heating device is turned on and the test steel beam 4 is heated to the temperature at which the internal force is released, the temperature internal force release node between the test steel beam 4 and the reaction frame 7 slips, releasing part of the temperature internal force. The controller reads the control force of the electro-hydraulic servo actuator 1 to obtain the internal force value after the temperature internal force of the steel beam is released.

[0045] According to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator 1 is the real-time temperature internal force of the steel beam. Reading the control force of the electro-hydraulic servo actuator 1 can obtain the internal force value after the temperature internal force of the steel beam is released. The measurement of temperature internal force is simple, has high precision, has a simple structure, and has a low cost. The displacement is measured by connecting the displacement gauge with a lead wire, and the displacement is convenient to measure through the displacement gauge, providing an effective test means for the experimental study of the temperature internal force of the steel structure.

[0046] In some embodiments of the present invention, a support frame 12 is arranged on the limiting device 3, and the support frame 12 is sleeved outside the test steel beam 4. The support frame 12 encloses the test steel beam 4.

[0047] In some embodiments of the present invention, two support seats 14 and a support member 13 are arranged inside the support frame 12. The two support seats 14 are respectively arranged at the top and bottom of the support frame 12, and the two support members 13 are arranged at the side of the support frame 12.

[0048] In some embodiments of the present invention, the sides of the support member 13 and the support seat 14 corresponding to the test steel beam 4 are arcs. The arc-shaped structure can prevent damage to the test steel beam 4 and reduce the frictional resistance between the two.

[0049] In some embodiments of the present invention, the heating device is an electromagnetic induction coil 11, the test steel beam 4 includes a steel beam member 9, and the electromagnetic induction coil 11 is sleeved outside the steel beam member 9. When in use, the electromagnetic induction coil 11 only consumes part of the electric power and does not require other cost inputs, so the use cost is low. The test steel beam 4 is heated through the principle of electromagnetic induction, and the heating process is accurately controlled. The surface temperature of the test steel beam 4 is read in real time by the thermocouple 6.

[0050] In some embodiments of the present invention, a heat insulation material layer 10 is further sleeved outside the steel beam member 9, and the electromagnetic induction coil 11 is located outside the heat insulation material layer 10. The heat insulation material is used to keep the temperature of the steel beam member 9 constant. The heat insulation material layer can be a polyester resin heat insulation layer, which includes an unsaturated polyester resin layer and an inorganic heat insulation layer arranged in sequence, and the unsaturated polyester resin layer is connected to the steel beam member 9. This heat insulation material layer has the advantages of light weight and good heat insulation performance.

[0051] In some embodiments of the present invention, a bracket 5 is provided on the reaction frame 7, and the test steel beam 4 is fixed on the reaction frame 7 through the bracket 5. The bracket 5 is connected to the test steel beam 4, and the temperature internal force release is realized through the connection of the test steel beam 4 and the bracket 5 by long circular holes of high-strength bolts.

[0052] In some embodiments of the present invention, the displacement gauges include a loading end displacement gauge 2 and a sliding end displacement gauge 8. The loading end displacement gauge 8 corresponds to the electro-hydraulic servo actuator 1, and the sliding end displacement gauge 8 corresponds to the reaction frame 7. The loading end displacement gauge 2 is located on one side of the electro-hydraulic servo actuator 1 for controlling the electro-hydraulic servo actuator 1 according to the displacement. The sliding end displacement gauge 8 is located on one side of the reaction frame 7 and is led out to the outside of the heat insulation material through a lead; the displacement gauges are connected to the test device and the computer.

[0053] On the other hand, the present invention also proposes a test method for the temperature internal force release of a steel structure. The test method for the temperature internal force release of a steel structure has the above-mentioned test device for the temperature internal force release of a steel structure. The specific steps are as follows:

[0054] S1. Fix the limit device 3 and the reaction frame 7;

[0055] S2. Lift and fix the test steel beam 4 on the limit device 3 and the reaction frame 7;

[0056] S3. Fix the electro-hydraulic servo actuator 1 on the test steel beam 4;

[0057] S4. Install the thermocouple 6 and the displacement gauges. Install the thermocouple 6 on the test steel beam, install the loading end displacement gauge 2 at one end of the test steel beam 4, install the sliding end displacement gauge 8 at the other end of the test steel beam 4, and the loading end displacement gauge 2 and the sliding end displacement gauge 8 are connected to the controller;

[0058] S5. Install the heating device 11 outside the test steel beam 4;

[0059] S6. Starting device: The controller controls the heating device to start heating the test steel beam 4. When the thermocouple 6 reads that the temperature of the test steel beam 4 reaches the preset temperature, the controller controls the heating device to turn off.

[0060] S7. Reading values: During the heating process, the controller reads the readings of the loading end displacement gauge 2 in real time, and controls the stroke of the electro-hydraulic servo actuator 1 in real time according to the readings of the loading end displacement gauge 2 so that the readings of the loading end displacement gauge 2 are always controlled at 0 mm, simulating the boundary condition of axial fixation at one end of the steel beam. According to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator 1 is the real-time temperature internal force of the steel beam. Read the readings of the slip end displacement gauge 8 to obtain the displacement values of the test steel beam 4 before and after the release of the temperature internal force.

[0061] In some embodiments of the present invention, it is characterized in that hoisting the test steel beam 4 equipped with the heating device in S5 includes the following specific steps:

[0062] S51. Wrap the heat insulation material layer 10 outside the steel beam member 9 of the test steel beam 4, and set the electromagnetic induction coil 11 outside the heat insulation material layer 10.

[0063] In the test device for releasing the temperature internal force of the steel structure of the present invention, the limiting device 3 is processed from steel plates, encloses the test steel beam 4, restricts the lateral deformation of the test steel beam 4, and the limiting device 3 is fixed to the ground by itself. The thermocouple 6 is arranged on the steel beam, used to measure the surface temperature of the steel beam and control the heating process; the thermocouple 6 is connected to the test measurement device. The corbel 5 is connected to the test steel beam 4, and the temperature internal force is released through the connection of the test steel beam 4 and the corbel 5 by long circular holes of high-strength bolts. The reaction frame 7 is connected to the corbel 5, used to fix the corbel 5, and the reaction frame 7 is fixed to the ground by itself. The outside of the test steel beam 4, the reaction frame 7 and the limiting device 3 is coated with a heat insulation material layer 10, used to ensure that the temperatures of the steel beam, the reaction frame 7 and the limiting device 3 are constant after heating. The electromagnetic induction coil 11 is wound outside the heat insulation material layer 10, used to make the test steel beam 4 through the principle of electromagnetic induction; the electromagnetic induction coil 11 is externally connected to an electromagnetic induction device. The electro-hydraulic servo actuator 1 is connected to the test steel beam 4 by bolts, used for test loading and measuring the internal force of the steel beam; the electro-hydraulic servo actuator 1 is connected to the test loading control system.

[0064] In summary, for the test device for releasing the temperature internal force of the steel structure provided by the present invention, according to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator 1 is the real-time temperature internal force of the steel beam. The measurement of the temperature internal force is simple, with high precision, simple structure and low cost. The displacement is convenient to measure through the displacement gauge, providing an effective test means for the experimental research on the temperature internal force of the steel structure, and having the advantages of convenient use, accurate results and low use cost.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An experimental device for releasing the temperature internal force of a steel structure, characterized in that, Comprising: A limiting device, an electro-hydraulic servo actuator, a displacement gauge, a thermocouple, a reaction frame, and a heating device; The limiting device is used to limit the circumferential direction of the test steel beam. One end of the test steel beam is arranged on the limiting device, and the other end of the test steel beam is arranged on the reaction frame; The electro-hydraulic servo actuator is connected to one end of the test steel beam. The displacement gauges are respectively arranged at both ends of the test steel beam and are connected to a controller, and the controller is connected to the electro-hydraulic servo actuator; The thermocouple and the heating device are respectively arranged on the test steel beam; A bracket is arranged on the reaction frame, and the other end of the test steel beam is fixed on the reaction frame through the bracket; the temperature internal force release is realized by connecting the test steel beam and the bracket through the long circular hole of the high-strength bolt; The displacement gauges include a loading end displacement gauge and a sliding end displacement gauge. The loading end and sliding end displacement gauges are arranged corresponding to the electro-hydraulic servo actuator, and the sliding end displacement gauge is arranged corresponding to the reaction frame; During the heating process, the controller reads the reading of the loading end displacement gauge in real time and controls the stroke of the electro-hydraulic servo actuator in real time according to the reading of the loading end displacement gauge so that the reading of the loading end displacement gauge is always controlled at 0 mm, simulating the boundary condition of axially fixing one end of the steel beam.

2. The test device for releasing the temperature internal force of the steel structure according to claim 1, wherein, A support frame is arranged on the limiting device, and the support frame is sleeved outside the test steel beam.

3. The test device for releasing the temperature internal force of the steel structure according to claim 2, characterized in that, Two support seats and support members are arranged inside the support frame. The two support seats are respectively arranged at the top and bottom of the support frame, and the two support members are arranged at the side of the support frame.

4. The test device for releasing the temperature internal force of the steel structure according to claim 3, characterized in that, The sides of the support members and the support seats corresponding to the test steel beam are arcs.

5. The test device for releasing the temperature internal force of the steel structure according to claim 1, characterized in that, The heating device is an electromagnetic induction coil. The test steel beam includes a steel beam member, and the electromagnetic induction coil is sleeved outside the steel beam member.

6. The test device for releasing the temperature internal force of the steel structure according to claim 5, characterized in that, A heat preservation material layer is also sleeved outside the steel beam member, and the electromagnetic induction coil is located outside the heat preservation material layer.

7. An experimental method for releasing the temperature internal force of a steel structure, characterized in that, Applying the test device for releasing the temperature internal force of the steel structure according to any one of claims 1 to 6, the specific steps are as follows: S1. Fix the limiting device and the reaction frame; S2. Lift and fix the test steel beam on the limiting device and the reaction frame; S3. Fix the electro-hydraulic servo actuator on the test steel beam; S4. Install the thermocouple and the displacement gauges. Install the thermocouple on the test steel beam, install the loading end displacement gauge at one end of the test steel beam, install the sliding end displacement gauge at the other end of the test steel beam, and connect the loading end displacement gauge and the sliding end displacement gauge to the controller; S5. Install the heating device outside the test steel beam; S6. Turn on the device. The controller controls the heating device to turn on to heat the test steel beam. When the thermocouple reads that the temperature of the test steel beam reaches the preset temperature, the controller controls the heating device to turn off; S7. Read the values. During the heating process, the controller reads the readings of the displacement gauge at the loading end in real time, and controls the stroke of the electro-hydraulic servo actuator in real time according to the readings of the displacement gauge at the loading end so that the readings of the displacement gauge at the loading end are always controlled at 0 mm, simulating the boundary condition of axial fixation at one end of the steel beam; according to the principle of balance of action and reaction, the control force of the electro-hydraulic servo actuator is the real-time temperature internal force of the steel beam; read the readings of the displacement gauge at the sliding end to obtain the displacement values of the test steel beam before and after the release of the temperature internal force.

8. The test method for releasing the temperature internal force of the steel structure according to claim 7, characterized in that, In step S5, hoisting the test steel beam equipped with the heating device includes the following specific steps: S51. Wrap a heat insulation material layer outside the steel beam member of the test steel beam, and arrange an electromagnetic induction coil outside the heat insulation material layer.

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