Method for calculating bending stiffness of joint, electronic device, and storage medium

Abstract

The application provides a joint bending stiffness calculation method, an electronic device and a storage medium. The method comprises the following steps: when a test beam is subjected to graded loading, the joint opening amount of the node area of the test beam and the actual strain of the anchorage reinforcement in the non-node area of the test beam under different load states are measured respectively; the structure parameters of the test beam are obtained, and the bond slip amount of the non-node area under different load states is calculated respectively according to the structure parameters and the actual strain; and the joint bending stiffness is calculated according to the bond slip amount and the joint opening amount. The application can improve the calculation accuracy of the joint bending stiffness of the anchorage joint.

Description

Technical Field

[0001] This invention relates to the field of prefabricated underground structure technology, and in particular to a method for calculating the bending stiffness of a joint, an electronic device, and a storage medium. Background Technology

[0002] In prefabricated underground structures, joints, as key connecting components between tunnel segments, have a significant impact on the overall structural design. Among them, anchored joints, as a new type of joint, have gradually begun to be applied in various prefabricated underground structures in recent years. For example, the CHC (C-shaped steel + H-shaped steel + C-shaped steel) joint used in prefabricated subway stations is a typical anchored joint.

[0003] When performing simulation calculations on prefabricated underground structures, the value of the bending stiffness of the anchored joint, as a key connecting component between tunnel segments, directly affects the accuracy of the overall structural calculation results. This is especially true in the design of large-section underground structures (such as prefabricated subway stations), where the value of the joint's bending stiffness is particularly important, and the bending stiffness of the joint often needs to be obtained through a series of indoor tests.

[0004] The four-point bending test is one of the important loading schemes for indoor bending tests of large joints. In practical applications, the four-point bending test is usually used to measure the joint opening of anchored joints under different loads, and the bending stiffness of the joint is calculated based on the joint opening. When conducting the four-point bending test, the test beam is first divided into two precast beam components, which are transported to the test site. Then, the two precast beam components are assembled using anchored joints, and loading and data acquisition equipment are installed. The bending performance loading test of the joint can then be carried out to measure the joint opening in the nodal area (i.e., the area where the anchored joint is located) of the test beam under different load conditions, and then the bending stiffness of the joint can be calculated.

[0005] However, the joint opening measured in the experiment is the result of the overall load bending of the test beam (including the beam in the nodal area and the non-nodal area), which includes the elongation caused by the slippage of the anchor bars and concrete in the non-nodal area beam. This makes the actual measured joint opening too large, resulting in inaccurate calculation of the joint bending stiffness. Summary of the Invention

[0006] This invention provides a method for calculating the bending stiffness of a joint, an electronic device, and a storage medium to solve the problem of inaccurate calculation of the bending stiffness of anchored joints in prefabricated underground structures.

[0007] In a first aspect, embodiments of the present invention provide a method for calculating the bending stiffness of a joint, comprising:

[0008] When the test beam is subjected to graded loading, the joint opening in the nodal area of ​​the test beam and the actual strain of the anchor bars in the non-nodal area of ​​the test beam are measured under different load conditions.

[0009] Obtain the structural parameters of the test beam, and calculate the bond slip in the non-nodal region under different load conditions based on the structural parameters and the actual strain.

[0010] The joint bending stiffness is calculated based on the bond slip and the joint opening.

[0011] In one possible implementation, the bond slip in the non-nodal region under different load states is calculated based on the structural parameters and the actual strain, including:

[0012] Based on the structural parameters, calculate the theoretical elongation of the anchor bars in the non-node area under different load conditions.

[0013] Based on the actual strain, calculate the actual elongation of the anchor bars in the non-node area under different load conditions.

[0014] Based on the theoretical elongation and the actual elongation, the bond slip of the non-node region under different load conditions is calculated respectively.

[0015] In one possible implementation, the step of calculating the theoretical elongation of the anchor bars in the non-nodal region under different load conditions based on the structural parameters includes:

[0016] Based on the structural parameters, calculate the theoretical strain of the anchor bars in the non-node area under different load conditions;

[0017] Based on the length of the anchor bars in the non-node area, the theoretical strain is integrated to obtain the theoretical elongation of the anchor bars in the non-node area under different load conditions.

[0018] In one possible implementation, calculating the actual elongation of the anchor bars in the non-nodal region under different load states based on the actual strain includes:

[0019] Based on the length of the anchor bars in the non-node area, the actual strain is integrated to obtain the actual elongation of the anchor bars in the non-node area under different load conditions.

[0020] In one possible implementation, the structural parameters include: the elastic modulus of concrete, the width of the test beam, the elastic modulus of the anchor bars, the cross-sectional area of ​​the anchor bars, the effective cross-sectional height, and the thickness of the protective layer.

[0021] The step of calculating the theoretical strain of the anchor bars in the non-nodal region under different load states based on the structural parameters includes:

[0022] according to Calculate the theoretical strain of the anchor bars in the non-node area under different load conditions;

[0023] Among them, E c ε represents the elastic modulus of concrete. c ε represents the theoretical extreme strain of concrete in the non-nodal region under the current load condition; b represents the width of the test beam; x represents the height of the compression zone of concrete in the non-nodal region; ε s E represents the theoretical strain of the anchor bars in the non-nodal region under the current load condition; s Indicates the elastic modulus of the anchor bar; A s The anchorage bar's cross-sectional area is represented by M; the bending moment corresponding to the current load is represented by h0; and the effective section height is represented by a. s This indicates the thickness of the protective layer.

[0024] In one possible implementation, calculating the bond slip in the non-nodal region under different load conditions based on the theoretical elongation and the actual elongation includes:

[0025] According to Δu=u' s -u s Calculate the bond slip in the non-nodal region under different load conditions;

[0026] Where Δu represents the amount of bond slip in the non-nodal region under the current load condition; u' s This indicates the actual elongation of the anchor bars in the non-nodal region under the current load condition; u s This represents the theoretical elongation of the anchor bars in the non-node region under the current load condition.

[0027] In one possible implementation, the joint bending stiffness is calculated based on the bond slip and the joint opening amount, including:

[0028] Calculate the joint opening correction amount based on the adhesive slip amount and the joint opening amount;

[0029] The bending stiffness of the joint is calculated based on the joint opening correction amount.

[0030] In one possible implementation, calculating the joint opening correction amount based on the adhesive slip amount and the joint opening amount includes:

[0031] According to d tru =d test -Δu calculates the joint opening correction amount under different load conditions;

[0032] Where, d tru This indicates the correction amount for the joint opening under the current load condition; d test Δu represents the joint opening under the current load condition; Δu represents the bond slip in the non-node region under the current load condition.

[0033] In a second aspect, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation thereof.

[0034] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation thereof.

[0035] This invention provides a method, electronic device, and storage medium for calculating the bending stiffness of a joint. The method involves measuring the joint opening in the nodal zone and the actual strain of the anchor bars in the non-nodal zone of a test beam under different load conditions during graded loading. Structural parameters of the test beam are obtained, and the bond-slip in the non-nodal zone is calculated under different load conditions based on the structural parameters and actual strain. The bending stiffness of the joint is calculated based on the bond-slip and joint opening. The bond-slip caused by the bond-slip between the anchor bars and concrete in the non-nodal zone can be calculated using the structural parameters and actual strain; this bond-slip represents the error value included in the measured joint opening. This error value can then be removed from the measured joint opening, and the bending stiffness is calculated based on the joint opening after removing the error, thereby improving the accuracy of the calculation of the bending stiffness of the anchored joint. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart illustrating the implementation of the method for calculating the bending stiffness of a joint provided in this embodiment of the invention.

[0038] Figure 2 This is a schematic diagram of the structure of the test beam provided in an embodiment of the present invention;

[0039] Figure 3 This is a flowchart illustrating the implementation of calculating bond slip provided in an embodiment of the present invention;

[0040] Figure 4 This is a flowchart illustrating the implementation of calculating the theoretical elongation provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic cross-sectional view of the non-node region of the test beam provided in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of the calculation device for the bending stiffness of the joint provided in an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0044] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0045] Traditional bolted joints are widely used in prefabricated underground structures (e.g., shield tunnels). Bolted joints transmit tensile force through the local compression of the concrete at the bolt hole on the tension side of the bolt, resulting in a significant local Saint-Venant effect, which easily leads to stress concentration, causing local concrete crushing or even collapse, making later maintenance difficult.

[0046] Anchored joints, as a new type of prefabricated joint, achieve tensile force transfer on the tension side through anchored connectors and anchor bars connected to them. When the anchored joint is subjected to bending moment loads, the anchored connector on the tension side can transfer the tensile force it bears to the concrete through the anchor bars, thus achieving tensile force transfer. Anchored joints make full use of the surrounding concrete, avoiding crushing failure caused by localized stress concentration on the tension side. Compared with traditional bolted joints, anchored joints have significant advantages.

[0047] However, as described in the background section, anchored joints also have certain drawbacks. Specifically, when measuring the joint opening, the actual measured joint opening is too large due to the bond slippage between the anchor bar and the concrete, which makes it impossible to accurately calculate the joint's bending stiffness.

[0048] Based on this, embodiments of the present invention provide a method for calculating the bending stiffness of a joint to solve the problem of inaccurate calculation of the bending stiffness of anchored joints. To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0049] Figure 1 The implementation flowchart of the method for calculating the bending stiffness of a joint provided in the embodiments of the present invention is described in detail below:

[0050] Step 101: When loading the test beam in stages, measure the joint opening in the nodal area of ​​the test beam and the actual strain of the anchor bars in the non-nodal area of ​​the test beam under different load conditions.

[0051] In practical applications, when calculating the bending stiffness of anchored joints, a corresponding test beam is usually prepared in advance based on the prefabricated underground structure, and a four-point bending test is established. The test beam is subjected to graded loading to measure the joint opening amount under different load conditions. Then, the bending stiffness of the joint is calculated based on the joint opening amount.

[0052] Therefore, before performing step 101, this embodiment of the invention also requires the preparation of corresponding test beams based on the geometric parameters of adjacent segments and their joint locations in the prefabricated underground structure, to simulate the loading state of the anchored joint locations in the prefabricated underground structure. See also Figure 2 The test beam is divided into nodal and non-nodal areas. Taking one beam height as the dividing line, the area on both sides of the center position with a length of one beam height is defined as the nodal area, which is used to simulate the anchored joint in the prefabricated underground structure; the non-nodal areas on both sides are used to simulate the segments on both sides of the anchored joint.

[0053] During the fabrication of the test beam, strain gauges are uniformly and continuously arranged along the length of the anchor bars on the surface of the non-node areas. This allows for the measurement of the actual strain of the anchor bars in the non-node areas under different load conditions when the test beam is subjected to graded loading. This embodiment of the invention does not specify the number of strain gauges or the spacing between them. It is understood that the denser the strain gauge arrangement, the more accurate the actual strain collected.

[0054] Step 102: Obtain the structural parameters of the test beam, and calculate the bond slip in the non-nodal region under different load conditions based on the structural parameters and actual strain.

[0055] Optional, see Figure 3 When calculating the bond slip in the non-nodal region under different load conditions based on structural parameters and actual strain, the following steps can be followed:

[0056] Step 121: Based on the structural parameters, calculate the theoretical elongation of the anchor bars in the non-node area under different load conditions.

[0057] Optional, see Figure 4 Step 121 may include:

[0058] Step 1211: Calculate the theoretical strain of the anchor bars in the non-node area under different load conditions based on the structural parameters.

[0059] Optionally, the structural parameters here may include: the elastic modulus of concrete, the width of the test beam, the elastic modulus of the anchor bars, the cross-sectional area of ​​the anchor bars, the effective cross-sectional height, and the thickness of the protective layer.

[0060] Step 1211 may include:

[0061] according to Calculate the theoretical strain of the anchor bars in the non-node region under different load conditions.

[0062] Among them, E c ε represents the elastic modulus of concrete. c ε represents the theoretical extreme strain of concrete in the non-nodal region under the current load condition; b represents the width of the test beam; x represents the height of the compression zone of concrete in the non-nodal region; ε s E represents the theoretical strain of the anchor bars in the non-nodal region under the current load condition; s Indicates the elastic modulus of the anchor bar; A s The anchorage bar's cross-sectional area is represented by M; the bending moment corresponding to the current load is represented by h0; and the effective section height is represented by a. s This indicates the thickness of the protective layer.

[0063] See Figure 5 The effective section height h0 refers to the distance between the upper surface of the test beam and the anchor bar. The thickness a of the protective layer... s This refers to the distance between the anchor bars and the lower surface of the test beam. The upper part of the beam in the non-node area is the concrete compression zone, and the height of the concrete compression zone is represented by x.

[0064] Optional structural parameters also include: the distance from the loading position to the mid-span and the distance from the support to the mid-span.

[0065] Based on the loading characteristics of the four-point bending test, the bending moment corresponding to different loads can be calculated according to the distance of the loading position from the mid-span and the distance of the support from the mid-span.

[0066] Optionally, the bending moment corresponding to different load states can be calculated using M = F × (L1 - L2).

[0067] Where M represents the bending moment corresponding to the current load, F represents the current load, L1 represents the distance from the support to the mid-span, and L2 represents the distance from the loading position to the mid-span.

[0068] See details Figure 2 The distance from the support to the mid-span L1 is the distance between the support and the center of the test beam; the distance from the loading position to the mid-span L2 is the distance between the loading position and the center of the test beam.

[0069] Based on concrete design principles, a force equilibrium equation can be established for the concrete section in the non-joint zone: 0.5E c ε c bx = ε s E s A s And the moment equilibrium equation:

[0070] Based on the plane section assumption, the concrete and anchor bars in the non-node region will exhibit deformation compatibility, thus establishing a deformation compatibility formula for the non-node region:

[0071] By simultaneously applying the force balance equations, moment balance equations, and deformation compatibility formulas mentioned above, the theoretical strain ε of the anchorage reinforcement in the non-nodal region under different load conditions can be calculated. s .

[0072] It should be noted that the theoretical strain calculated based on concrete design principles and the plane section assumption is a theoretical value and does not take into account the bond slip effect between the anchor bar and the concrete during actual application.

[0073] Step 1212: Based on the length of the anchor bars in the non-node area, integrate the theoretical strain to obtain the theoretical elongation of the anchor bars in the non-node area under different load conditions.

[0074] according to By integrating the theoretical strain, the theoretical elongation of the anchor bars in the non-nodal region under different load conditions can be obtained.

[0075] Among them, u s ε represents the theoretical elongation of the anchor bars in the non-nodal region under the current load condition; s represents the theoretical strain of the anchor bars in the non-node region under the current load condition; l represents the sum of the lengths of the anchor bars in the non-node regions on both sides.

[0076] Accordingly, the theoretical elongation does not include the elongation caused by the bond slip between the anchor bar and the concrete.

[0077] Step 122: Calculate the actual elongation of the anchor bars in the non-node area under different load conditions based on the actual strain.

[0078] Optionally, step 122 may include:

[0079] Based on the length of the anchor bars in the non-node area, the actual strain is integrated to obtain the actual elongation of the anchor bars in the non-node area under different load conditions.

[0080] Similarly, according to By integrating the actual strain, the actual elongation of the anchor bars in the non-node region under different load conditions is obtained.

[0081] Among them, u' s This represents the actual elongation of the anchor bars in the non-nodal region under the current load condition; ε' s This represents the actual strain of the anchor bars in the non-node region under the current load condition; l represents the sum of the lengths of the anchor bars in the non-node regions on both sides.

[0082] Step 123: Calculate the bond slip in the non-nodal region under different load conditions based on the theoretical elongation and the actual elongation.

[0083] Optionally, step 123 may include:

[0084] According to Δu=u' s -u s Calculate the bond slip in the non-nodal region under different load conditions;

[0085] Where Δu represents the amount of bond slip in the non-nodal region under the current load condition; u' s This indicates the actual elongation of the anchor bars in the non-nodal region under the current load condition; u s This represents the theoretical elongation of the anchor bars in the non-node region under the current load condition.

[0086] The theoretical elongation calculation does not consider the bond-slip effect between the anchor bars and the concrete, while the actual elongation is calculated based on the actual strain measured during actual loading, which includes the elongation caused by bond-slip, i.e., the bond-slip amount. Therefore, based on the difference between the two, the bond-slip amount caused by the slippage between the anchor bars and the concrete in the non-joint zone can be calculated.

[0087] Step 103: Calculate the bending stiffness of the joint based on the amount of bond slip and the amount of joint opening.

[0088] Optionally, step 103 may include:

[0089] Calculate the joint opening correction amount based on the amount of bond slip and the amount of joint opening.

[0090] Optional, it can be based on d tru =d test -Δu calculates the joint opening correction amount under different load conditions;

[0091] Where, d tru This indicates the correction amount for the joint opening under the current load condition; d test Δu represents the joint opening under the current load condition; Δu represents the bond slip in the non-node region under the current load condition.

[0092] Calculate the bending stiffness of the joint based on the joint opening correction amount.

[0093] Optionally, calculating the bending stiffness of the joint based on the joint opening correction amount may include:

[0094] Based on the joint opening correction amount under different load conditions, the joint rotation angle under different load conditions can be calculated.

[0095] The bending stiffness of the joint can be determined based on the joint rotation angle under different load conditions.

[0096] Optional, according to The joint rotation angle under different load conditions can be calculated;

[0097] Where θ represents the joint rotation angle under the current load condition; d tru This indicates the correction amount for the joint opening under the current load condition; h indicates the beam height of the test beam.

[0098] After calculating the joint rotation angle under different load conditions, a moment-rotation angle curve can be established based on the bending moment and joint rotation angle corresponding to different load conditions, and the slope of the moment-rotation angle curve can be determined as the joint bending stiffness.

[0099] Therefore, a moment-rotation curve can be established based on the bending moment corresponding to different load states and the joint rotation angle under different load states. The slope of this curve is the bending stiffness of the joint.

[0100] This invention improves the accuracy of joint bending stiffness calculation for anchored joints by measuring the joint opening amount in the nodal zone and the actual strain of the anchor bars in the non-nodal zone of the test beam under different load conditions during graded loading. The structural parameters of the test beam are obtained, and the bond slip in the non-nodal zone is calculated under different load conditions based on the structural parameters and actual strain. The joint bending stiffness is calculated based on the bond slip and joint opening amount. The bond slip caused by the bond slip between the anchor bars and concrete in the non-nodal zone can be calculated using the structural parameters and actual strain; this is the error value included in the actually measured joint opening amount. This error value can then be removed from the actually measured joint opening amount, and the joint bending stiffness is calculated based on the joint opening amount after removing the error.

[0101] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0102] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0103] Figure 6 A schematic diagram of the structure of the calculation device for the bending stiffness of a joint provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0104] like Figure 6 As shown, the calculation device 6 for the bending stiffness of the joint includes a measurement module 61 and a calculation module 62.

[0105] The measurement module 61 is used to measure the joint opening in the nodal area of ​​the test beam and the actual strain of the anchor bars in the non-nodal area of ​​the test beam under different load conditions when the test beam is subjected to graded loading.

[0106] The calculation module 62 is used to obtain the structural parameters of the test beam and calculate the bond slip in the non-nodal region under different load conditions based on the structural parameters and actual strain.

[0107] The calculation module 62 is also used to calculate the joint bending stiffness based on the amount of bond slip and the amount of joint opening.

[0108] In one possible implementation, the calculation module 62 is used to calculate the theoretical elongation of the anchor bars in the non-node area under different load conditions based on the structural parameters.

[0109] The calculation module 62 is also used to calculate the actual elongation of the anchor bars in the non-node area under different load conditions based on the actual strain.

[0110] The calculation module 62 is also used to calculate the bond slip in the non-nodal region under different load conditions based on the theoretical elongation and the actual elongation.

[0111] In one possible implementation, the calculation module 62 is used to calculate the theoretical strain of the anchor bars in the non-node area under different load states based on the structural parameters.

[0112] The calculation module 62 is also used to integrate the theoretical strain based on the length of the anchor bars in the non-node area to obtain the theoretical elongation of the anchor bars in the non-node area under different load conditions.

[0113] In one possible implementation, the calculation module 62 is used to integrate the actual strain based on the length of the anchor bars in the non-node area to obtain the actual elongation of the anchor bars in the non-node area under different load conditions.

[0114] In one possible implementation, the structural parameters include: the elastic modulus of concrete, the width of the test beam, the elastic modulus of the anchor bars, the cross-sectional area of ​​the anchor bars, the effective cross-sectional height, and the thickness of the protective layer.

[0115] Calculation module 62, used for calculating based on Calculate the theoretical strain of the anchor bars in the non-nodal zone under different load conditions;

[0116] Among them, E c ε represents the elastic modulus of concrete. c ε represents the theoretical extreme strain of concrete in the non-nodal region under the current load condition; b represents the width of the test beam; x represents the height of the compression zone of concrete in the non-nodal region; ε s E represents the theoretical strain of the anchor bars in the non-nodal region under the current load condition; s Indicates the elastic modulus of the anchor bar; A s The anchorage bar's cross-sectional area is represented by M; the bending moment corresponding to the current load is represented by h0; and the effective section height is represented by a. s This indicates the thickness of the protective layer.

[0117] In one possible implementation, the calculation module 62 is used to calculate based on Δu=u' s -u s Calculate the bond slip in the non-nodal region under different load conditions;

[0118] Where Δu represents the amount of bond slip in the non-nodal region under the current load condition; u' s This indicates the actual elongation of the anchor bars in the non-nodal region under the current load condition; u s This represents the theoretical elongation of the anchor bars in the non-node region under the current load condition.

[0119] In one possible implementation, the calculation module 62 is used to calculate the joint opening correction amount based on the adhesive slip amount and the joint opening amount;

[0120] The calculation module 62 is also used to calculate the bending stiffness of the joint based on the joint opening correction amount.

[0121] In one possible implementation, the calculation module 62 is used to calculate based on d tru =d test -Δu calculates the joint opening correction amount under different load conditions;

[0122] Where, d tru This indicates the correction amount for the joint opening under the current load condition; d test Δu represents the joint opening under the current load condition; Δu represents the bond slip in the non-node region under the current load condition.

[0123] In this embodiment of the invention, a measurement module 61 is used to measure the joint opening in the nodal area and the actual strain of the anchor bars in the non-nodal area of ​​the test beam under different load conditions when the test beam is subjected to graded loading; a calculation module 62 is used to obtain the structural parameters of the test beam and calculate the bond slip in the non-nodal area under different load conditions based on the structural parameters and the actual strain; the calculation module 62 is also used to calculate the joint bending stiffness based on the bond slip and joint opening. The calculation module 62 can calculate the bond slip caused by the bond slip between the anchor bars and the concrete in the non-nodal area, which is the error value contained in the actual measured joint opening, through the structural parameters and the actual strain. This error value can then be removed from the actual measured joint opening, and the joint bending stiffness can be calculated based on the joint opening after removing the error, thereby improving the calculation accuracy of the joint bending stiffness of the anchored joint.

[0124] Figure 7 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. For example... Figure 7 As shown, the electronic device 7 of this embodiment includes: a processor 70, a memory 71, and a computer program 72 stored in the memory 71 and executable on the processor 70. When the processor 70 executes the computer program 72, it implements the steps in the above-described embodiments of the calculation method for the bending stiffness of each joint, for example... Figure 1 Steps 101 to 103 are shown. Alternatively, when the processor 70 executes the computer program 72, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 6 The functions of modules 61 to 62 shown.

[0125] For example, the computer program 72 can be divided into one or more modules / units, which are stored in the memory 71 and executed by the processor 70 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 72 in the electronic device 7. For example, the computer program 72 can be divided into... Figure 6 Modules 61 to 62 are shown.

[0126] The electronic device 7 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. The electronic device 7 may include, but is not limited to, a processor 70 and a memory 71. Those skilled in the art will understand that... Figure 7 This is merely an example of electronic device 7 and does not constitute a limitation on electronic device 7. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0127] The processor 70 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0128] The memory 71 can be an internal storage unit of the electronic device 7, such as a hard disk or memory. The memory 71 can also be an external storage device of the electronic device 7, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 7. Furthermore, the memory 71 can include both internal and external storage units of the electronic device 7. The memory 71 is used to store the computer program and other programs and data required by the electronic device. The memory 71 can also be used to temporarily store data that has been output or will be output.

[0129] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0130] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0131] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0132] In the embodiments provided by this invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0133] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0134] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0135] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above embodiments of the method for calculating the bending stiffness of each joint. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for calculating the bending stiffness of a joint, characterized in that, include: When the test beam is subjected to graded loading, the joint opening in the nodal area of ​​the test beam and the actual strain of the anchor bars in the non-nodal area of ​​the test beam are measured under different load conditions. Obtain the structural parameters of the test beam, and calculate the bond slip in the non-nodal region under different load conditions based on the structural parameters and the actual strain. Calculate the joint bending stiffness based on the bond slip and the joint opening. Based on the structural parameters and the actual strain, the bond slip in the non-nodal region under different load conditions is calculated, including: Based on the structural parameters, calculate the theoretical elongation of the anchor bars in the non-node area under different load conditions. Based on the actual strain, calculate the actual elongation of the anchor bars in the non-node area under different load conditions. Based on the theoretical elongation and the actual elongation, calculate the bond slip in the non-nodal region under different load conditions; The calculation of bond slip in the non-nodal region under different load conditions based on the theoretical elongation and the actual elongation includes: according to Calculate the bond slip in the non-nodal region under different load conditions; in, This represents the amount of bond slip in the non-nodal region under the current load condition; This indicates the actual elongation of the anchor bars in the non-node area under the current load condition; This represents the theoretical elongation of the anchor bars in the non-nodal region under the current load condition. Calculate the joint bending stiffness based on the bond slip and the joint opening, including: Calculate the joint opening correction amount based on the adhesive slip amount and the joint opening amount; Calculate the bending stiffness of the joint based on the joint opening correction amount; The step of calculating the joint opening correction amount based on the adhesive slip amount and the joint opening amount includes: according to Calculate the joint opening correction amount under different load conditions; in, This indicates the amount of correction for the joint opening under the current load condition; This indicates the amount of joint opening under the current load condition; This represents the amount of bond slip in the non-nodal region under the current load condition.

2. The method for calculating the bending stiffness of a joint according to claim 1, characterized in that, The step of calculating the theoretical elongation of the anchor bars in the non-node region under different load conditions based on the structural parameters includes: Based on the structural parameters, calculate the theoretical strain of the anchor bars in the non-node area under different load conditions; Based on the length of the anchor bars in the non-node area, the theoretical strain is integrated to obtain the theoretical elongation of the anchor bars in the non-node area under different load conditions.

3. The method for calculating the bending stiffness of a joint according to claim 1, characterized in that, The step of calculating the actual elongation of the anchor bars in the non-nodal zone under different load conditions based on the actual strain includes: Based on the length of the anchor bars in the non-node area, the actual strain is integrated to obtain the actual elongation of the anchor bars in the non-node area under different load conditions.

4. The method for calculating the bending stiffness of a joint according to claim 2, characterized in that, The structural parameters include: the elastic modulus of concrete, the width of the test beam, the elastic modulus of the anchor bars, the cross-sectional area of ​​the anchor bars, the effective cross-sectional height, and the thickness of the protective layer. The step of calculating the theoretical strain of the anchor bars in the non-nodal region under different load states based on the structural parameters includes: according to Calculate the theoretical strain of the anchor bars in the non-node area under different load conditions; in, This indicates the elastic modulus of concrete. This represents the theoretical extreme strain of concrete in the non-nodal region under the current load condition; Indicates the width of the test beam; Indicates the height of the concrete compression zone in the non-node region; This represents the theoretical strain of the anchor bars in the non-nodal region under the current load condition; This indicates the elastic modulus of the anchor bar; This indicates the cross-sectional area of ​​the anchor bar; This indicates the bending moment corresponding to the current load; Indicates the effective cross-sectional height; This indicates the thickness of the protective layer.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for calculating the bending stiffness of the joint as described in any one of claims 1 to 4.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for calculating the bending stiffness of the joint as described in any one of claims 1 to 4.

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