Estimation method, detection method and detection equipment for relative displacement difference of steel bars

Abstract

The present invention discloses a method for estimating the relative displacement difference of steel bars, a detection method, and a detection device. The method for estimating the relative displacement difference of steel bars includes: inputting the initial assembly data of steel bars, sleeves, and grouting materials to establish a three-dimensional steel bar grouting sleeve model; applying different excitations to the steel bars to obtain the displacements of each symmetric position of the steel bars, and calculating the relative displacement differences of each symmetric position of the steel bars; calculating the ratios of the relative displacement differences of each symmetric position of the steel bars to the relative displacement differences of the adjacent ends, and fitting them into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation of each symmetric position of the steel bars, so as to estimate the relative displacement differences of each symmetric position of the steel bars inside the sleeve after being excited. The present invention quantifies the relative displacement differences of the symmetric positions of two steel bars in the grouting sleeve under the action of load in the prefabricated building through numerical simulation and data analysis, providing a new method for estimating the relative displacement of the steel bars inside the sleeve in the research of prefabricated building engineering.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering, and further relates to a method for estimating the relative displacement difference of steel bars, a detection method, and a detection device. Background Art

[0002] The technology of steel bar grouting sleeve connection was first proposed in the late 1960s. In construction engineering, if steel bar grouting sleeves with unqualified quality and unqualified tensile strength are used, it will not only affect the quality of the building, but also bring serious potential safety hazards. Therefore, it is very necessary to conduct quality inspection and series of research on steel bar grouting sleeves. Existing research on the mechanical properties of steel bar grouting sleeve connectors often focuses on the influence of factors such as steel bar anchorage length, grouting material strength, and sleeve strength. It does not involve the relative displacement change of the two steel bars in the sleeve, and lacks a method for estimating the displacement change of the steel bars in the sleeve. Summary of the Invention

[0003] Aiming at the above technical problems, the purpose of the present invention is to provide a method for estimating the relative displacement difference of steel bars, a detection method, and a detection device, which quantify the relative displacement difference of the two steel bars at each symmetric position of the grouting sleeve under load in prefabricated buildings through numerical simulation and data analysis, providing a new way for estimating the relative displacement of the steel bars in the sleeve in the research of prefabricated building engineering.

[0004] In order to achieve the above purpose, the present invention provides a method for estimating the relative displacement difference of steel bars, a detection method, and a detection device, and the specific calculation scheme is as follows:

[0005] In the first aspect, the present invention discloses a method for estimating the relative displacement difference of steel bars, including:

[0006] Input the initial assembly data of steel bars, sleeves, and grouting materials, establish a three-dimensional steel bar grouting sleeve model, symmetrically sleeve the sleeve on the adjacent ends of the two spaced steel bars and fill it with grouting material;

[0007] Simulate different excitations on the steel bars, obtain the displacements generated at each symmetric position of the steel bars, the symmetric positions include sampling points and symmetric points, the sampling points are symmetrical with respect to the mid-axis of the interval between the two steel bars, and calculate the relative displacement difference between each sampling point and the corresponding symmetric point of the steel bars;

[0008] Calculate the ratio of the relative displacement difference at each symmetric position of the steel bars to the relative displacement difference at the adjacent ends; and fit it into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation at each symmetric position of the steel bars, so as to estimate the relative displacement difference at each symmetric position of the steel bars inside the sleeve after being excited through the relative displacement difference ratio equation.

[0009] In some embodiments, the initial assembly data of the steel bars, the sleeves, and the grouting material include: the diameters, lengths, and spacing of the two steel bars, and the diameters, lengths, and sleeved lengths of the sleeves.

[0010] In some embodiments, different excitations are simulated on the steel bars to obtain the displacements generated at each symmetric position of the steel bars; specifically, it includes:

[0011] Simulate different excitations on the steel bars on either side of the sleeve model;

[0012] Obtain the displacement β generated at the sampling points on the steel bars subjected to the excitation (nd) , and the displacement β generated at the symmetric points corresponding to the sampling points (nd') , where d and d' represent the diameters of the corresponding steel bars; nd represents the distance of the sampling point from the adjacent end of the steel bar where it is located, and nd' is the distance of the symmetric point from the adjacent end of the steel bar where it is located;

[0013] Calculate the relative displacement difference δ at each symmetric position of the steel bars n =β (nd) -β (nd') .

[0014] In some embodiments, calculate the ratio of the relative displacement difference at each symmetric position of the steel bars to the relative displacement difference at the adjacent end; and fit it into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation at each symmetric position of the steel bars; specifically, it includes:

[0015] Calculate the relative displacement difference δ0 = β (0d) -β (0d') ; where the β (0d) is the displacement generated at the adjacent end of the steel bar on the stressed side; the β (0d') is the displacement generated at the adjacent end of the steel bar on the other side;

[0016] Calculate the ratio δ of the displacement difference at each symmetric position of the steel bars to the relative displacement difference at the reference position n / δ0;

[0017] According to the data of the relative displacement difference ratio δ n / δ0 distributed longitudinally along the steel bars under different excitations, perform curve fitting to obtain the relative displacement difference ratio equation at each symmetric position on the steel bars:

[0018] δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0.

[0019] In a second aspect, the present invention also discloses a method for detecting the relative displacement difference of steel bars, including:

[0020] The relative displacement difference ratio equation obtained by using the relative displacement difference estimation method of any one of the above preferred embodiments;

[0021] It also includes: obtaining the displacements of any set of corresponding symmetric positions of the steel bars outside the sleeve;

[0022] Calculating the relative displacement difference corresponding to this symmetric position of the steel bars;

[0023] According to the relative displacement difference of this symmetric position of the steel bars, combined with the relative displacement difference ratio equation, calculate the relative displacement difference δ0 of the steel bars near the end;

[0024] According to the relative displacement difference ratio δ0 of the steel bars near the end, combined with the relative displacement difference ratio equation, calculate the relative displacement difference ratio δ corresponding to each symmetric position of the steel bars inside the sleeve n .

[0025] In some embodiments, the relative displacement difference ratio equation is:

[0026] δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0

[0027] Where d is the diameter length of the steel bars; nd is the distance from the measurement point on the steel bars to its adjacent end.

[0028] In a third aspect, the present invention also discloses a device for estimating the relative displacement difference of steel bars, including:

[0029] A modeling module for inputting the initial assembly data of the steel bars, the sleeve and the grouting material, and establishing a three-dimensional steel bar grouting sleeve model;

[0030] A simulation module for applying different excitations to the steel bars to obtain the displacements of each symmetric position of the steel bars; the symmetric positions include sampling points and symmetric points, and the sampling points are symmetric about the mid-axis of the interval between the two opposite steel bars with the symmetric points;

[0031] A calculation module for calculating the relative displacement difference between each sampling point and the corresponding symmetric point of the steel bars; and calculating the ratio of the displacement difference of each symmetric position of the steel bars to the relative displacement difference near the end;

[0032] A processing module, configured to fit the ratio of the relative displacement differences at the symmetric positions of the steel bars to the relative displacement difference near the end into a relative displacement difference ratio curve, and obtain the relative displacement difference ratio equation for each symmetric position of the steel bars, so as to estimate the relative displacement differences of each symmetric position of the steel bars inside the sleeve after being excited through the relative displacement difference ratio equation.

[0033] In some embodiments, the modeling module includes:

[0034] An input module, configured to input the initial assembly data of the steel bars, the sleeve, and the grouting material;

[0035] A building module, configured to build a three-dimensional steel bar grouting sleeve model.

[0036] In some embodiments, the simulation module includes:

[0037] A force application unit, configured to apply different excitations to one end of any of the steel bars away from the sleeve;

[0038] A reading unit, configured to obtain the displacements of each symmetric position of the steel bars after being excited relative to before being excited.

[0039] In some embodiments, the calculation module includes:

[0040] A first calculation unit, configured to calculate the relative displacement difference δ between each sampling point and the corresponding symmetric point of the steel bars according to the displacements of each symmetric position of the steel bars. n =β (nd) -β (nd') ; where d and d' represent the diameters of the corresponding steel bars; nd represents the distance from the sampling point to the near end of the steel bar where it is located, and nd' is the distance from the symmetric point to the near end of the steel bar where it is located; β (nd) is the displacement of the sampling point, and β (nd') is the displacement of the corresponding symmetric point;

[0041] A second calculation unit, configured to calculate the ratio δ of the relative displacement difference of each symmetric position of the steel bars to the relative displacement difference near the end according to the relative displacement difference δ between each sampling point and the corresponding symmetric point of the steel bars. n / δ0; n / δ0;

[0042] The processing module is specifically configured to perform curve fitting according to the data of the relative displacement difference ratio δ n / δ0 distributed longitudinally along the steel bar under different excitation actions, and obtain the relative displacement difference ratio equation for each symmetric position on the steel bar:

[0043] δ n =(1.314 - 0.472nd + 0.370(nd)2 )δ0。

[0044] Thirdly, the present invention also discloses a device for detecting the relative displacement difference of steel bars, including: the device for estimating the relative displacement difference of steel bars according to any one of the above preferred embodiments, and obtaining the relative displacement difference ratio equation of each symmetric position of the steel bars in the sleeve model through the device for estimating the relative displacement difference of steel bars; the device for detecting the relative displacement difference of steel bars further includes:

[0045] A receiving module, configured to receive the symmetric position information of the steel bars, where the symmetric position information includes the displacements of any set of corresponding symmetric positions of the steel bars outside the sleeve;

[0046] A calculation and detection module, configured to calculate the displacement difference corresponding to the received symmetric position information according to the received symmetric position information; then calculate the relative displacement difference ratio δ0 of the steel bar near the end according to the displacement difference of this symmetric position of the steel bar; finally, calculate the relative displacement difference ratio δ of each symmetric position of the steel bar in the sleeve according to the relative displacement difference ratio δ0 of the steel bar near the end, in combination with the relative displacement difference ratio equation n 。

[0047] Compared with the prior art, the method for estimating the relative displacement difference of steel bars, the detection method and the detection device provided by the present invention have the following beneficial effects:

[0048] 1. Quantify the relative displacement difference of the two steel bars at the symmetric positions of the grouting sleeve under the action of load in the prefabricated building through numerical simulation and data analysis, so as to understand the steel bar slip situation inside the grouting sleeve under the excitation action, and provide a new way for estimating the relative displacement of the steel bars inside the sleeve in the research of prefabricated building engineering;

[0049] 2. Based on the model simulation, multi-dimensional and multi-condition numerical experiments can be carried out, so as to obtain the optimal relative displacement difference ratio equation, which greatly simplifies the influence of on-site tests on research costs in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above characteristics, technical features, advantages and their implementation manners of the present invention will be further described below in a clear and easy-to-understand manner in combination with the drawings in the preferred embodiments.

[0051] Figure 1 is a flowchart of the method for estimating the relative displacement difference of steel bars of the present invention;

[0052] Figure 2 is a flowchart of the method for detecting the relative displacement difference of steel bars of the present invention;

[0053] Figure 3 is a model diagram A of the steel bar and the sleeve;

[0054] Figure 4 It is the model diagram B of the steel bar and the sleeve;

[0055] Figure 5 It is the detection equipment diagram;

[0056] Figure 6 It is the comparison diagram of the displacement difference at each symmetric position of the steel bar and the experimental data;

[0057] Figure 7 It is the fitted relative displacement difference ratio curve diagram.

[0058] Explanation of the reference numerals in the attached drawings:

[0059] Modeling module 10, input unit 11, establishment unit 12, steel bar 121, sleeve 122, simulation module 20, force application unit 21, reading unit 22, calculation module 30, first calculation unit 31, second calculation unit 32, processing module 40, receiving module 50, calculation and detection module 60. Detailed implementation manners

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific implementation manners of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0061] For the sake of simplicity of the drawings, only the parts related to the invention are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some drawings, for components with the same structure or function, only one of them is schematically shown, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0062] It should be further understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0063] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" 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 or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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.

[0064] In addition, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. It should be noted that the above-mentioned embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

[0065] Embodiment 1:

[0066] In one embodiment, referring to Figure 1 and Figure 3 , the present invention provides a method for estimating the relative displacement difference of steel bars 121, including:

[0067] S101 Input the initial assembly data of the steel bars 121, sleeves 122 and grouting materials, establish a three-dimensional model of the steel bar 121 grouting sleeve 122, symmetrically sleeve the sleeve 122 on the adjacent ends of two spaced steel bars 121 and fill with grouting materials;

[0068] In this embodiment, the initial assembly data of the steel bars 121, the sleeves 122 and the grouting materials include: the diameters, lengths and the distance between two steel bars 121 and the diameters, lengths and sleeved lengths of the sleeves 122.

[0069] Specifically, the specific structure and relative positions of the three-dimensional model of the steel bar 121 grouting sleeve 122 adopt the common structures and standard distances in construction. The modeling software can be selected as Patran. Patran was originally advocated and developed by the National Aeronautics and Space Administration (NASA) and is widely used in fields such as aviation, aerospace, automotive, machinery, civil engineering, and biomechanics. The refined models established by it require little or no simplification or modification, and the accuracy of the results of the models established by Patran is recognized in various industries.

[0070] S102 Simulate different excitations on the steel bars 121, obtain the displacements of each symmetric position of the steel bars 121, the symmetric positions include sampling points and symmetric points, the sampling points are symmetric about the mid-axis of the interval between the two steel bars 121, and calculate the relative displacement difference between each sampling point and the corresponding symmetric point of the steel bars 121;

[0071] In this embodiment, the simulation of applying different excitations to the steel bars 121 and obtaining the displacements generated at each symmetric position of the steel bars 121 specifically includes: simulating different excitations on the steel bars 121 on either side of the sleeve 122 model;

[0072] Obtain the displacement β generated at the sampling points on the steel bars 121 subjected to the excitation(nd) , and the displacement β generated by the symmetric point corresponding to the sampling point (nd') , where d and d' represent the diameters of the corresponding steel bars 121; nd represents the distance from the sampling point to the adjacent end of the steel bar 121 where it is located, and nd' is the distance from the symmetric point to the adjacent end of the steel bar 121 where it is located;

[0073] Calculate the relative displacement difference δ at each symmetric position of the steel bar 121 n = β (nd) - β (nd') .

[0074] S103 Calculate the ratio of the relative displacement difference at each symmetric position of the steel bar 121 to the relative displacement difference at the adjacent end part, and fit it into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation at each symmetric position of the steel bar 121, so as to estimate the relative displacement difference at each symmetric position of the steel bar 121 inside the sleeve 122 after being excited through the relative displacement difference ratio equation.

[0075] In this embodiment, calculating the ratio of the relative displacement difference at each symmetric position of the steel bar 121 to the relative displacement difference at the adjacent end part; and fitting it into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation at each symmetric position of the steel bar 121; specifically includes:

[0076] Calculate the relative displacement difference δ0 = β (0d) - β (0d') ; where the β (0d) is the displacement generated at the adjacent end of the stressed-side steel bar 121; the β (0d') is the displacement generated at the adjacent end of the other steel bar 121;

[0077] Calculate the ratio δ of the displacement difference at each symmetric position of the steel bar 121 to the relative displacement difference at the reference position n / δ0;

[0078] According to the data of the relative displacement difference ratio δ n / δ0 distributed longitudinally along the steel bar 121 under different excitation actions, perform curve fitting to obtain the relative displacement difference ratio equation at each symmetric position on the steel bar 121:

[0079] δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0.

[0080] Specifically, the adjacent end is the two end corners where the two steel bars 121 are close to each other, and it is also symmetrical about the midpoint where the two steel bars 121 are spaced apart. It can be defined as the first sampling point and the first symmetry point and used as the reference position. After receiving the excitation, the displacements of the first sampling point and the second symmetry point at the adjacent end of the steel bar 121 are β (0d) and β (0d') , and the displacement difference δ0 at the adjacent end of the steel bar 121 is δ0 = β (0d) - β (0d') . After receiving the excitation, the relative displacement differences at other symmetrical positions of the steel bar 121 are δ n = β (nd) - β (nd') . The ratio of the relative displacement differences at each symmetrical position of the steel bar 121 to the relative displacement difference at the adjacent end is δ n / δ0. For example, referring to Figure 4 , the sampling point is at a position 6 diameters (6d) away from the adjacent end of the steel bar 121, and the symmetry point is at a position 6 diameters (6d') away from the adjacent end of the other steel bar 121. The relative displacement difference at the symmetrical position of the 6th diameter length of the steel bar 121 is δ (6) = β (6d) - β (6d') , where β (6d) is the displacement at a position 6 diameters (6d) away from the adjacent end of the steel bar 121 that is excited, and β (6d') is the displacement of the other steel bar 121 at a position 6 diameters (6d') away from the adjacent end of the steel bar 121. The first sampling point at the adjacent end of the steel bar is 0d, and the first symmetry point is 0d'. The relative displacement difference at the adjacent end of the steel bar 121 is δ (0) = β (0d) - β (0d') ; the ratio of the relative displacement difference at the symmetrical position of the 6th diameter length of the steel bar 121 to the relative displacement difference at the adjacent end is δ6 / δ0; then, based on the displacement differences at all symmetrical positions of the steel bar 121 and the ratios of the relative displacement differences at each symmetrical position to the relative displacement difference at the adjacent end, the relative displacement difference ratio curve is obtained. The horizontal axis of the relative displacement difference ratio curve is the distance nd of the steel bar 121 from the adjacent end, and the vertical axis is the ratio δ n / δ0 of the displacement differences at each symmetrical position of the steel bar 121 to the displacement difference at the adjacent end; the obtained relative displacement difference ratio equation for each symmetrical position of the steel bar 121 is δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0.

[0081] Reference Figure 6, in this embodiment, Nastran is used for nonlinear analysis to study the relative displacement of two steel bars 121 at symmetric positions in the grouting sleeve 122 of the steel bars 121, and the displacement difference δ at N lengths of the steel bars 121 near the end of the steel bars 121 obtained from the simulation is obtained. n , among which, the displacement difference δ at 10 lengths of the steel bars near the end of the steel bars is obtained through simulation. 10 , and it is compared with the actual experimental data and summarized in Figure 6 , δ 10 The change trend is in good agreement with the experimental data, thus proving the correctness of the model. By using the powerful nonlinear processor of Nastran, various deformation problems in construction engineering can be solved. At the same time, based on the model simulation, multi-dimensional and multi-condition numerical experiments can be carried out to obtain the optimal engineering results, which greatly simplifies the influence of on-site tests on research costs in practical applications.

[0082] Reference Figure 7 , for the data of the relative displacement difference ratio δ n / δ0 distributed at each symmetric position of the steel bar 121 obtained by model calculation under different excitations, Mathematica is used for programming fitting to obtain the fitting curve. For the results of numerical simulation, Mathematica is used for programming, and the powerful data processing ability of Mathematica is used to complete the long and tedious data analysis task. Finally, the relative displacement difference equation of each symmetric position of the steel bar 121 is obtained, providing a new basis for estimating the relative displacement of the steel bar 121 for engineering needs.

[0083] Embodiment 2: Refer to Figure 2 and Figure 3 , the present invention provides a method for detecting the relative displacement difference of the steel bar 121, including: S201 the relative displacement difference ratio equation obtained by the relative displacement difference estimation method of any one of the above embodiments for the steel bar 121;

[0084] It further includes S202 obtaining the displacements of any set of corresponding symmetric positions of the steel bar 121 outside the sleeve 122;

[0085] S203 calculating the relative displacement difference corresponding to the symmetric position of the steel bar 121;

[0086] S204 calculating the relative displacement difference δ0 near the end of the steel bar 121 according to the relative displacement difference of the symmetric position of the steel bar 121 and combining the relative displacement difference ratio equation;

[0087] S205 calculating the relative displacement difference ratio δ n。

[0088] In this embodiment, the relative displacement difference ratio equation is as follows:

[0089] δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0

[0090] Wherein, d is the diameter length of the steel bar; nd is the distance from the measuring point on the steel bar to its adjacent end.

[0091] Specifically, first obtain the displacement of any set of corresponding symmetric positions of the relative displacement difference ratio equation and the steel bar 121 outside the sleeve 122, and then use the relative displacement difference ratio equation to estimate the required relative displacement difference ratio of each symmetric position of the steel bar 121 inside the sleeve 122. In actual application, it greatly simplifies the influence of on-site tests on research costs, and calculates the slip condition of the steel bar 121 inside the grouting sleeve 122 at a very fast speed, providing a new method for estimating the relative displacement of the steel bar 121 in the research of prefabricated building projects.

[0092] For example, first obtain the relative displacement difference ratio equation δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0 according to the relative displacement difference estimation method of the steel bar 121 described in any one of the above embodiments, and then obtain the displacements β (8d) and β (8d’) of the symmetric positions where the steel bar 121 is 8 diameter lengths away from the adjacent end, and then calculate the displacement difference δ (8) =β (8d) -β (8d') at this symmetric position of the steel bar 121. Then substitute δ (8) into the relative displacement difference ratio equation. Since δ (8) and 8d are both known, the relative displacement difference ratio δ0 of the adjacent end of the steel bar 121 can be obtained. At this time, since δ0 in the relative displacement difference ratio equation δ n is known, the relative displacement difference of any symmetric position of the steel bar 121 can be estimated, especially the relative displacement difference of each symmetric position of the steel bar 121 inside the sleeve 122.

[0093] Embodiment 3:

[0094] Based on the same inventive concept, the present invention also discloses an estimation device for the relative displacement difference of steel bars 121. This estimation device can use the relative displacement difference estimation method of the steel bars 121 described in any one of the above embodiments to estimate the relative displacement of the symmetric positions of the steel bars 121 in the sleeve 122. Specifically, an embodiment of the estimation device based on the relative displacement difference estimation method of the steel bars 121 in the present application includes: a modeling module 10, a simulation module 20, a calculation module 30, and a processing module 40.

[0095] The modeling module 10 is used to input the initial assembly data of the steel bars 121, the sleeve 122, and the grouting material, and establish a three-dimensional steel bar 121 grouting sleeve 122 model;

[0096] Specifically, the modeling module 10 includes an input unit 11 and a building unit 12. The input unit 11 is used to input the initial assembly data of the steel bars 121, the sleeve 122, and the grouting material; the building unit 12 is used to establish a three-dimensional steel bar 121 grouting sleeve 122 model.

[0097] The simulation module 20 is used to simulate different excitations on the steel bars 121 to obtain the displacements of the symmetric positions of the steel bars 121; the symmetric positions include sampling points and symmetric points, and the sampling points are symmetrical about the mid-axis of the interval between the two opposite steel bars 121 from the symmetric points.

[0098] Specifically, the simulation module 20 includes a force application unit 21 and a reading unit 22; the force application unit 21 is used to apply different excitations to one end of any steel bar 121 away from the sleeve 122; the acquisition unit 22 is used to obtain the displacements of the symmetric positions of the steel bar 121 relative to those before being excited after being excited.

[0099] The calculation module 30 is used to calculate the relative displacement differences between the sampling points and the corresponding symmetric points of the steel bars 121; and calculate the ratio of the displacement differences of the symmetric positions of the steel bars 121 to the relative displacement differences of the adjacent ends.

[0100] Specifically, the calculation module 30 includes a first calculation unit 31 and a second calculation unit 32; the first calculation unit is used to calculate the relative displacement difference δ between the sampling points and the corresponding symmetric points of the steel bars 121 according to the displacements of the symmetric positions of the steel bars 121 n =β (nd) -β (nd') ; where d and d' represent the diameters of the corresponding steel bars 121; nd represents the distance from the sampling point to the adjacent end of the steel bar 121 where it is located, and nd' is the distance from the symmetric point to the adjacent end of the steel bar 121 where it is located; β (nd) is the displacement of the sampling point, β (nd')is the displacement of the corresponding symmetric point; the second calculation unit is configured to calculate, according to the relative displacement difference δ between each sampling point of the steel bar 121 and the corresponding symmetric point n , the ratio δ of the relative displacement difference at each symmetric position of the steel bar 121 to the relative displacement difference near the end n / δ0.

[0101] The processing module 40 is configured to fit the ratio of the relative displacement difference at each symmetric position of the steel bar 121 to the relative displacement difference near the end into a relative displacement difference ratio curve, and obtain the relative displacement difference ratio equation at each symmetric position of the steel bar 121, so as to estimate the relative displacement difference at each symmetric position of the steel bar 121 inside the sleeve 122 after being excited through the relative displacement difference ratio equation.

[0102] Specifically, the processing module 40 is specifically configured to perform curve fitting according to the data of the relative displacement difference ratio δ n / δ0 distributed longitudinally along the steel bar 121, and obtain the relative displacement difference ratio equation at each symmetric position on the steel bar:

[0103] δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0.

[0104] Embodiment 4:

[0105] Based on the same technical concept, the present invention also discloses a relative displacement difference detection device for the steel bar 121. This detection device can use the relative displacement difference detection method for the steel bar 121 described in any one of the above embodiments to detect the relative displacement difference at the symmetric positions of the steel bar 121 inside the sleeve 122. Specifically, the embodiment of the relative displacement difference detection device for the steel bar 121 in this application includes the relative displacement difference estimation device for the steel bar 121 described in any one of the above embodiments, and obtains the relative displacement difference ratio equation at each symmetric position of the steel bar 121 in the sleeve 122 model through the relative displacement difference estimation device for the steel bar 121; the relative displacement difference detection device for the steel bar 121 further includes:

[0106] A receiving module 50, configured to receive the information of each symmetric position of the steel bar 121, where the symmetric position information includes the displacements of any set of corresponding symmetric positions of the steel bar 121 outside the sleeve 122;

[0107] The calculation and detection module 60 is configured to calculate the displacement difference corresponding to the received symmetric position information; then calculate the relative displacement difference ratio δ0 of the vicinity of the end of the steel bar 121 according to the displacement difference at the symmetric position of the steel bar 121; and finally calculate the relative displacement difference ratio δ of each symmetric position of the steel bar 121 in the sleeve 122 according to the relative displacement difference ratio δ0 of the vicinity of the end of the steel bar 121 and in combination with the relative displacement difference ratio equation. n 。

[0108] The detection device can obtain the relative displacement difference equation of the steel bar 121 based on the measurable size parameters of the grouted sleeve 122 of the steel bar 121 and the generated displacement in reality, and then can extremely quickly estimate the relative displacement difference of each symmetric position of the steel bar 121 in the sleeve 122 and deduce the displacement change of the steel bar 121 in the sleeve 122, greatly simplifying the influence of on-site tests on research costs in practical applications.

[0109] It should be noted that the above embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. Method for estimating relative displacement difference of steel bars, characterized in that, Including: Input the initial assembly data of steel bars, sleeves and grouting materials, establish a three-dimensional steel bar grouting sleeve model, symmetrically sleeve the sleeve on the adjacent ends of two spaced steel bars and fill with grouting material; Simulate different excitations on the steel bars, obtain the displacements generated at each symmetric position of the steel bars, the symmetric positions include sampling points and symmetric points, the sampling points are symmetric about the mid-axis of the interval between the two steel bars with respect to the symmetric points, and calculate the relative displacement differences between each sampling point and the corresponding symmetric point of the steel bars; Calculate the ratio of the relative displacement difference at each symmetric position of the steel bars to the relative displacement difference at the adjacent end; and fit it into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation at each symmetric position of the steel bars, so as to estimate the relative displacement differences at each symmetric position of the steel bars inside the sleeve after being excited through the relative displacement difference ratio equation; The simulating different excitations on the steel bars and obtaining the displacements generated at each symmetric position of the steel bars specifically includes: Simulate different excitations on the steel bars on either side of the sleeve model; Obtain the displacement β generated by the sampling point on the stimulated steel bar (nd) , and the displacement β generated by the symmetric point corresponding to the sampling point (nd') , where d and d' represent the diameters of the corresponding steel bars; nd represents the distance of the sampling point from the adjacent end of the steel bar where it is located, and nd' is the distance of the symmetric point from the adjacent end of the steel bar where it is located; Calculate the relative displacement difference δ at each symmetric position of the steel bar n =β (nd) -β (nd') ; The calculating the ratio of the relative displacement difference at each symmetric position of the steel bars to the relative displacement difference at the adjacent end; and fitting it into a relative displacement difference ratio curve to obtain the relative displacement difference ratio equation at each symmetric position of the steel bars specifically includes: Calculate the relative displacement difference δ0 = β between the adjacent ends of the two steel bars (0d) -β (0d') ; where, the β (0d) is the displacement generated at the adjacent end of the steel bar on the stressed side; the β (0d') is the displacement generated at the adjacent end of the steel bar on the other side; Calculate the ratio δ of the displacement difference at each symmetric position of the steel bar to the relative displacement difference at the reference position n / δ0; According to the data of the ratio δ n / δ0 of the relative displacement differences along the longitudinal direction of the steel bar under different excitation actions, curve fitting is performed to obtain the relative displacement difference ratio equation at each symmetric position on the steel bar: δ n = (1.314 - 0.472nd + 0.370(nd) 2 )δ0。 2. The method for estimating the relative displacement difference of steel bars according to claim 1, wherein The initial assembly data of the steel bars, the sleeves and the grouting materials include: the diameters, lengths and the distance between the two steel bars, and the diameters, lengths and the sleeved lengths of the sleeves.

3. Detection method for relative displacement difference of steel bars, characterized in that, Including: Using the relative displacement difference ratio equation obtained by the method for estimating the relative displacement difference of steel bars according to any one of claims 1-2, the detection method further includes: Obtain the displacements of any set of corresponding symmetric positions of the steel bars outside the sleeve; Calculate the relative displacement difference corresponding to this symmetric position of the steel bars; According to the relative displacement difference at this symmetric position of the steel bars, combined with the relative displacement difference ratio equation, calculate the relative displacement difference δ0 at the adjacent end of the steel bars; According to the relative displacement difference ratio δ0 of the steel bar near the end, and in combination with the relative displacement difference ratio equation, calculate the relative displacement difference ratio δ corresponding to each symmetric position of the steel bar in the sleeve n .

4. The method for detecting the relative displacement difference of steel bars according to claim 3, wherein The relative displacement difference ratio equation is: δ n = (1.314 - 0.472nd + 0.370(nd) 2 )δ0 Wherein, d is the diameter length of the steel bars; nd is the distance from the measurement point on the steel bars to its adjacent end.

5. Reinforcement relative displacement difference estimation device, characterized in that, Including: A modeling module for inputting the initial assembly data of steel bars, sleeves and grouting materials and establishing a three-dimensional steel bar grouting sleeve model; A simulation module for simulating different excitations on the steel bars and obtaining the displacements at each symmetric position of the steel bars; the symmetric positions include sampling points and symmetric points, the sampling points are symmetric about the mid-axis of the interval between the two steel bars with respect to the symmetric points; A calculation module for calculating the relative displacement differences between each sampling point and the corresponding symmetric point of the steel bars; and calculating the ratio of the displacement differences at each symmetric position of the steel bars to the relative displacement difference at the adjacent end; A processing module, configured to fit a ratio curve of the relative displacement differences between the symmetric positions of the steel bars and the relative displacement differences near the ends into a relative displacement difference ratio curve, and obtain a relative displacement difference ratio equation for each symmetric position of the steel bars, so as to estimate the relative displacement differences of each symmetric position of the steel bars inside the sleeve after being excited through the relative displacement difference ratio equation; The calculation module includes: The first calculation unit is configured to calculate a relative displacement difference δ between each sampling point and its corresponding symmetric point of the steel bar according to displacements at symmetric positions of the steel bar n = β (nd) - β (nd') ; where d and d' represent diameters of corresponding steel bars; nd represents a distance from the sampling point to a neighboring end of the steel bar where the sampling point is located, and nd' is a distance from the symmetric point to a neighboring end of the steel bar where the symmetric point is located; β (nd) is the displacement of the sampling point, and β (nd') is the displacement of the corresponding symmetric point; A second calculation unit, configured to calculate a ratio δ / δ0 of the relative displacement difference at each symmetric position of the steel bar to the relative displacement difference at the end portion adjacent to the steel bar according to the relative displacement difference δ between each sampling point of the steel bar and the corresponding symmetric point n and the relative displacement difference δ0 at the end portion adjacent to the steel bar n ; The processing module is specifically configured to perform curve fitting based on the data of the relative displacement difference ratio δ n / δ0 distributed longitudinally along the steel bar, and obtain the relative displacement difference ratio equation at each symmetric position on the steel bar: δ n =(1.314 - 0.472nd + 0.370(nd) 2 )δ0。 6. The steel bar relative displacement difference estimation device according to claim 5, wherein The simulation module includes: A force application unit, configured to apply different excitations to one end of any one of the steel bars away from the sleeve; A reading unit, configured to obtain the displacements of each symmetric position of the steel bar after being excited relative to before being excited.

7. Detection equipment for relative displacement difference of steel bars, characterized in that Including the steel bar relative displacement difference estimation device according to any one of claims 5-6, and obtaining a relative displacement difference ratio equation for each symmetric position of the steel bars in the sleeve model through the steel bar relative displacement difference estimation device; The steel bar relative displacement difference detection device further includes: A receiving module, configured to receive the symmetric position information of the steel bar, where the symmetric position information includes the displacements of any set of corresponding symmetric positions of the steel bar outside the sleeve; A calculation and detection module is used to calculate the displacement difference corresponding to the received symmetric position information; then, based on the displacement difference at the symmetric position of the steel bar, calculate the relative displacement difference ratio δ0 near the end of the steel bar; finally, based on the relative displacement difference ratio δ0 near the end of the steel bar and in combination with the relative displacement difference ratio equation, calculate the relative displacement difference ratio δ at each symmetric position of the steel bar within the sleeve n .

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