CN109062031B - Deformation component feedback control device and control method for space lateral constraint loading - Google Patents
Deformation component feedback control device and control method for space lateral constraint loading Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The deformation component feedback control device for the space lateral constraint loading comprises a loading device, a constraint device and a displacement measuring device; at least one group of loading devices is arranged on one longitudinal side of the test member; each group of loading devices are arranged at intervals in a vertical parallel manner, and each loading device is correspondingly arranged with the node position of the test member; the free end of the loading device is horizontally connected to the test member and is used for applying transverse load to the node; the restraint device is provided with a group and is arranged on one lateral side of the test member; the free end of the restraining device is horizontally connected to the test member and used for restraining the longitudinal displacement of the node; the displacement measuring device has a set of measuring devices disposed on opposite sides of the restraining device for measuring longitudinal displacement of the test member. The invention solves the technical problems that the boundary condition is difficult to reproduce accurately and the accuracy of the test result is lower in the traditional test method.
Description
Technical Field
The invention belongs to the field of experimental mechanics, and particularly relates to a deformation component device of a test member of a civil engineering structure under space lateral constraint loading and a control method thereof.
Background
Building structures are often limited by economic and experimental environmental constraints due to their large size, making full-scale structural testing difficult. The current common test method generally selects key parts or stress complex concentrated parts in the structure for research. The structural member selected in this way is subjected to mechanical property research, and the true stress state of the boundary of the member needs to be restored, namely, the boundary condition of the member is reproduced. However, the method is limited by technical conditions, and only sensitive degrees of freedom in the degrees of freedom of the boundary of the component are usually limited by nodes, but the conclusion obtained in this way is different from the true stress condition of the structure because the component moves along with the whole structure in the structure, the movement process and the mode are complex and changeable, and the displacement and the rotation angle change of the limited degrees of freedom in the test are related to the whole movement of the structure.
Disclosure of Invention
The invention provides a deformation component feedback control device and a control method for space lateral constraint loading, which aim to solve the technical problems that boundary conditions are difficult to reproduce accurately and accuracy of test results is low in a traditional test method.
The technical scheme of the invention is as follows.
A deformation component feedback control device for space lateral constraint loading comprises a loading device, a constraint device and a displacement measurement device; at least one group of loading devices is arranged on one longitudinal side of the test member; wherein, each group of loading devices are arranged at intervals along the vertical direction in parallel, and each loading device is correspondingly arranged with the node position of the test member; the free end of the loading device is horizontally connected to the test member and is used for applying transverse load to the node; the restraint device is provided with a group and is arranged on one lateral side of the test member; the free end of the restraining device is horizontally connected to the test member and used for restraining the longitudinal displacement of the node; the displacement measuring device is provided with a group which is arranged at the opposite side of the restraining device and is used for measuring the longitudinal displacement of the test member.
Preferably, the test member is a reinforced concrete frame structural member or a steel structural member.
Preferably, the outer sides of the loading device and the constraint device are provided with counterforce walls; the fixed end of the loading device is fixedly connected with the counterforce wall, and the free end of the loading device is fixedly connected with the test component through bolts; the fixed end of the restraining device is fixedly connected with the counterforce wall, and the free end of the restraining device is fixedly connected with the test component through bolts; the outer side of the displacement measuring device is provided with a reaction frame, and the fixed end of the displacement measuring device is fixedly connected with the reaction frame; the free end of the displacement measuring device is hinged with the test member.
Preferably, the loading device, the restraining device and the displacement measuring device are all connected with a computer, and the computer receives the loading information of the loading device and the actual lateral restraining displacement acquired by the displacement measuring deviceAnd (5) performing analysis and judgment.
A control method of a deformation component feedback control device for space lateral constraint loading comprises the following steps.
Step 1: arranging a loading device on one longitudinal side of the test member, and simultaneously arranging a restraining device and a displacement measuring device on the opposite side of the test member; wherein the loading device, the restraining device and the displacement measuring device are arranged at a sensitive stress point of the test member.
Step 2: setting corresponding target lateral constraint displacement at each sensitive stress point of the test component
Step 3: determining control parameter K in proportional-integral control algorithm p 、K i The method comprises the steps of carrying out a first treatment on the surface of the Wherein K is p Is a proportion parameter, K i Is an integral parameter and selects the addition of the loading meansAnd carrying speed control parameters.
Step 4: loading is carried out by using a loading device, and meanwhile, the actual lateral constraint displacement of the test component at the corresponding sensitive stress point is acquired by using a displacement measuring device
Step 5: comparing the actual lateral constrained displacement at the sensitive stress point of the test memberLateral restraint of displacement from target>Analyzing the error between the actual lateral constraint displacement and the target lateral constraint displacement +.>
Step 6: when (when)When the error is larger than the error required by the regulation, a displacement correction command is obtained, the displacement correction command is fed back to the loading device, and the loading device corrects the loaded numerical value after receiving the displacement correction command and then continues loading.
Step 7: repeating the processes from step 4 to step 6 untilAnd (5) finishing boundary correction by an error smaller than the specified requirement.
Preferably, the sensitive stress point in the step 1 is a frame node, a primary beam node, a secondary beam node or a beam column node.
Preferably, the calculation formula of the proportional-integral control algorithm in the step 3 is as followsWherein Δt is the displacement meter sampling interval, +.>A command is corrected for the displacement.
Preferably, in step 4, the loading device outputs the loading information to the computer, and the displacement measuring device constrains the acquired actual lateral displacement of the test memberOutputting the data to a computer, and analyzing and judging the data by the computer;
step 6: when (when)When the error is larger than the specified requirement, the specific method for obtaining the displacement correction command is as follows: presetting a control algorithm by using a computer program, for formula +.>Calculating to obtain a displacement correction command +.>
Preferably, in step 6When the error is smaller than the prescribed request, the boundary correction is completed, and the operation is stopped.
Compared with the prior art, the invention has the following characteristics and beneficial effects.
1. The method is to control and load the constraint degree of freedom of the test component, to perform error monitoring by arranging the displacement measuring device at the opposite side of the constraint device, to load by adopting the feedback control method and to adjust the loading device by the algorithm, thereby ensuring the high-precision simulation of the real boundary condition of the constraint degree of freedom.
2. According to the control method, displacement measuring devices are arranged at sensitive stress points of test components to monitor the constraint direction displacement change of the test components, the sampling result of the external displacement measuring devices is compared with the expected displacement, errors of the displacement measuring devices are analyzed, command adjustment of the lateral constraint devices, the displacement measuring devices and the loading devices is completed by using a program preset control algorithm, boundary conditions are corrected, the accurate simulation effect of the constraint boundaries of the components is achieved, the problem that the boundary conditions are difficult to reproduce accurately in the traditional test is solved, and the reliability of the test results is improved.
3. The control method is suitable for loading control of space lateral constraint of the structure in civil engineering experiments, can carry out high-precision displacement control on lateral constraint nodes, timely corrects lateral displacement of test components, and ensures that the experiments finish simulation of boundary conditions and application of loads according to preset purposes.
Drawings
Fig. 1 is a front view of a deformation component feedback control device in accordance with the present invention.
Fig. 2 is a top view of a deformation component feedback control device according to the present invention.
Fig. 3 is a side view of a deformation component feedback control device according to the present invention.
Reference numerals: 1-loading device, 2-restraint device, 3-displacement measuring device, 4-test component, 4.1-stand, 4.2-frame roof beam, 5-reaction wall, 6-reaction frame.
Detailed Description
As shown in fig. 1-3, the deformation component feedback control device for space lateral constraint loading comprises a loading device 1, a constraint device 2 and a displacement measuring device 3; the loading device 1 is provided with a group which is arranged at the left side of the test component 4; wherein, each group of loading devices 1 are arranged at intervals in parallel along the vertical direction, and each loading device 1 is arranged corresponding to the node position of the test member 4; the free end of the loading device 1 is horizontally connected to the test member 4 for applying a transverse load to the node; at least one group of restraining devices 2 is arranged on one lateral side of the test member 4; wherein each group of restraint devices 2 are arranged at intervals in parallel along the vertical direction and correspond to the loading device 1; the free end of the restraining device 2 is horizontally connected to the test member 4 and used for restraining the longitudinal displacement of the node; at least one group of displacement measuring devices 3 is arranged at the opposite side of the restraining device 2 and is used for measuring the longitudinal displacement of the test member 4 and feeding back the longitudinal displacement to the restraining device 2.
In this embodiment, the test member 4 is a reinforced concrete frame structure member, and includes upright posts 4.1 and frame beams 4.2 connected between adjacent upright posts 4.1; the left side and the rear side of the test member 4 are provided with reaction walls 5; the loading devices 1 are horizontally connected between the left counter-force wall and the upright posts 4.1, and each loading device 1 is correspondingly arranged with a beam column connecting node; the fixed end of the loading device 1 is fixedly connected with the counterforce wall 5 through bolts, and the free end of the loading device 1 is fixedly connected with the upright column 4.1 through bolts; the restraint devices 2 are horizontally connected between the counter-force wall at the rear side and the upright posts 4.1, the number of groups of the restraint devices 2 is matched with that of the upright posts 4.1, and each restraint device 2 is correspondingly arranged with a beam column connecting node; the fixed end of the restraint device 2 is fixedly connected with the counterforce wall 5 through bolts, and the free end of the restraint device 2 is fixedly connected with the upright column 4.1 through bolts; the front side of the displacement measuring device 3 is provided with a reaction frame 6, and each displacement measuring device 3 is arranged at the opposite side of each restraint device 2; the fixed end of the displacement measuring device 3 is fixedly connected with the counter-force frame 6 through bolts, and the free end of the displacement measuring device 3 is hinged with the upright post 4.1.
Of course in other embodiments, the test member 4 may also be a steel structural member; at least one group of loading devices 1 is arranged on one longitudinal side of the test member 4; wherein each group of loading devices 1 is arranged at intervals in parallel in the vertical direction, and each loading device 1 is provided corresponding to the node position of the test member 4.
In this embodiment, the loading device 1, the restraining device 2 and the displacement measuring device 3 are all connected with a computer, the loading device 1 restrains the displacement by the loading information and the actual lateral direction acquired by the displacement measuring device 3Output to a computer which receives the loading information of the loading device 1 and the actual lateral constraint displacement acquired by the displacement measuring device 3And (3) performing analysis and judgment, and feeding back an analysis result to the loading device 1.
The control method of the deformation component feedback control device for space lateral constraint loading carries out displacement monitoring on typical stress points and constraint directions on a test member 4, error information is collected, a loading control command is obtained through control algorithm analysis, and displacement and counter force of the constraint directions of the member are corrected, so that boundary conditions are ensured to accord with expectations; the method comprises the following steps.
Step 1: the loading device 1 is arranged on the left side of the test member 4, while the restraining device 2 is arranged on the rear side of the test member 4, and the displacement measuring device 3 is arranged on the front side of the test member 4; wherein the loading device 1, the restraining device 2 and the displacement measuring device 3 are arranged at a frame node of the test member 4, which is either a primary or secondary beam node or a beam column node.
Step 2: setting corresponding target lateral constraint displacement in each step of loading process at each sensitive stress point of the test component 4 in a computerWherein, the superscript m is the constraint point number, the subscript i is the loading step number, and the same references are given below.
Step 3: determining control parameter K in proportional-integral control algorithm p 、K i The method comprises the steps of carrying out a first treatment on the surface of the Wherein K is p Is a proportion parameter, K i Is an integral parameter; selecting a loading speed control parameter suitable for the loading device 1 at the time of ensuring stable loading control; control parameter K p And K i The determination method is more, and the gradual amplification test method is adopted for determination.
Step 4: loading is carried out by using the loading device 1, and meanwhile, the displacement measuring device 3 is used for collecting the actual lateral constraint displacement of the test member 4 at the corresponding sensitive stress pointThe loading device 1 outputs the loading information to the computer, while the displacement measuring device 3 constrains the acquired actual lateral displacement of the test member 4 +.>And outputting the data to a computer, and analyzing and judging the data by the computer.
Step 5: comparing the actual lateral constrained displacement at the sensitive stress point of the test member 4Lateral restraint of displacement from target>Analyzing the error between the actual lateral constraint displacement and the target lateral constraint displacement +.>Wherein (1)>Is the loading error of the mth constraint point corresponding to the current ith step.
Step 6: when (when)When the error is larger than the prescribed requirement, the computer uses the computer program to preset the control algorithm, and the formula is +.> Calculating to obtain a displacement correction command +.>And feeding back the displacement correction command to the loading device 1, the restraining device 2 and the displacement measuring device 3; after receiving the displacement correction command, the restraint device 2 corrects the restraint counter force, and after receiving the displacement correction command, the displacement measuring device 3 corrects the displacement in the restraint direction; after receiving the displacement correction command, the loading device 1 corrects the loaded numerical value and then continuesAnd (5) loading.
Step 7: while the loading device 1 loads the member, the constraining device 2 and the displacement measuring device 3 at each constraining node execute the respective correction commandsMeanwhile, error information is collected, and a correction command loaded next time is calculated; repeating the processes of step 4 to step 6 until +.>The error smaller than the specified requirement, and finishing the boundary correction; the criteria for performing the boundary correction are set by the experimenter and can be + ->Less than 1mm, may be +.>Less than 0.1mm.
In this embodiment, the loading device 1, the restraining device 2 and the displacement measuring device 3 in step 1 may be disposed at some other structural nodes or parts set by the experimenter according to the own experimental requirements.
In this embodiment, the target lateral constraint displacement in step 2The displacement which the tester wants the test piece to realize is set by the tester according to the test purpose of the tester.
In this embodiment, when in step 6When the error is smaller than the prescribed request, the boundary correction is completed, and the operation is stopped.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of protection of the present invention encompasses equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (7)
1. A control method of a deformation component feedback control device for space lateral constraint loading is characterized in that,
the deformation component feedback control device for space lateral constraint loading comprises a loading device (1), a constraint device (2) and a displacement measuring device (3); at least one group of loading devices (1) is arranged on one longitudinal side of the test component (4); wherein, each group of loading devices (1) are arranged at intervals in parallel along the vertical direction, and each loading device (1) is arranged corresponding to the node position of the test component (4); the free end of the loading device (1) is horizontally connected to the test member (4) for applying a transverse load to the node; the restraint device (2) is provided with a group and is arranged on one lateral side of the test member (4); wherein, the free end of the restraint device (2) is horizontally connected to the test member (4) for restraining the longitudinal displacement of the node; the displacement measuring device (3) is provided with a group and is arranged at the opposite side of the restraining device (2) for measuring the longitudinal displacement of the test member (4); the outer sides of the loading device (1) and the constraint device (2) are provided with counterforce walls (5); the fixed end of the loading device (1) is connected with the counter-force wall (5), and the free end of the loading device (1) is fixedly connected with the test component (4) through bolts; the fixed end of the restraining device (2) is connected with the counter-force wall (5), and the free end of the restraining device (2) is fixedly connected with the test component (4) through bolts; the outside of the displacement measuring device (3) is provided with a reaction frame (6), and the fixed end of the displacement measuring device (3) is fixedly connected with the reaction frame (6); the free end of the displacement measuring device (3) is hinged with the test component (4);
the method comprises the following steps:
step 1: a loading device (1) is arranged on one longitudinal side of the test member (4), and a restraint device (2) and a displacement measuring device (3) are arranged on the opposite side of the test member (4); wherein the loading device (1), the restraining device (2) and the displacement measuring device (3) are arranged at sensitive stress points of the test member (4);
step 2: corresponding target lateral constraint displacement is set at each sensitive stress point of the test component (4)
Step 3: determining control parameter K in proportional-integral control algorithm p 、K i The method comprises the steps of carrying out a first treatment on the surface of the Wherein K is p Is a proportion parameter, K i Is an integral parameter and selects a loading speed control parameter of the loading device (1);
step 4: the loading device (1) is used for loading, and the displacement measuring device (3) is used for collecting the actual lateral constraint displacement of the test component (4) at the corresponding sensitive stress point
Step 5: comparing the actual lateral constrained displacement at the sensitive stress point of the test member (4)Lateral restraint of displacement from target>Analyzing the error between the actual lateral constraint displacement and the target lateral constraint displacement +.>
Step 6: when (when)When the error is larger than the error required by the regulation, a displacement correction command is obtained, the displacement correction command is fed back to the loading device (1), the constraint device (2) and the displacement measurement device (3), and the loading device (1) corrects the loaded numerical value after receiving the displacement correction command and then continues loading;
step 7: repeating the processes from step 4 to step 6 untilAnd (5) finishing boundary correction by an error smaller than the specified requirement.
2. The control method of a spatial side-constrained loading deformation component feedback control device according to claim 1, wherein: the test member (4) is a reinforced concrete frame structure member or a steel structure member.
3. The control method of a spatial side-constrained loading deformation component feedback control device according to claim 1, wherein: the loading device (1), the restraint device (2) and the displacement measuring device (3) are all connected with a computer, and the computer receives the loading information of the loading device (1) and the actual lateral restraint displacement acquired by the displacement measuring device (3)And (5) performing analysis and judgment.
4. The method of claim 1, wherein the sensitive stress point in step 1 is a frame node, a primary secondary beam node, or a beam-column node.
5. The method of claim 1, wherein the proportional-integral control algorithm in step 3 is calculated by the formula ofWherein deltat is the displacement meter sampling interval; />A command is corrected for the displacement.
6. The method according to claim 5, wherein in step 4, the loading device (1) outputs the loading information to the computer, and the displacement measuring device (3) outputs the acquired actual lateral constraint displacement of the test member (4)Outputting the data to a computer, and analyzing and judging the data by the computer;
step 6: when (when)When the error is larger than the specified requirement, the specific method for obtaining the displacement correction command is as follows: presetting a control algorithm by using a computer program, for formula +.>Calculating to obtain displacement correction command
Order the
7. The control method of a spatial side-constrained load deformation component feedback control device according to claim 1, wherein in step 6, whenWhen the error is smaller than the prescribed request, the boundary correction is completed, and the operation is stopped.
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| CN102435427A (en) * | 2011-09-22 | 2012-05-02 | 东华大学 | System for testing comprehensive performance of beam column nodes of goods shelf |
| CN107577142A (en) * | 2017-07-31 | 2018-01-12 | 中国建筑股份有限公司 | A kind of large stiffness structure tests loading method |
| CN107608205A (en) * | 2017-07-31 | 2018-01-19 | 中国建筑股份有限公司 | A kind of planar three freedom load test method for building structure |
| CN207114343U (en) * | 2017-09-08 | 2018-03-16 | 华北理工大学 | Multistory frame structure loads and its deformation measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4495672B2 (en) * | 2003-07-02 | 2010-07-07 | ニューブレクス株式会社 | Structure monitoring system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435427A (en) * | 2011-09-22 | 2012-05-02 | 东华大学 | System for testing comprehensive performance of beam column nodes of goods shelf |
| CN107577142A (en) * | 2017-07-31 | 2018-01-12 | 中国建筑股份有限公司 | A kind of large stiffness structure tests loading method |
| CN107608205A (en) * | 2017-07-31 | 2018-01-19 | 中国建筑股份有限公司 | A kind of planar three freedom load test method for building structure |
| CN207114343U (en) * | 2017-09-08 | 2018-03-16 | 华北理工大学 | Multistory frame structure loads and its deformation measuring device |
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