A method and apparatus for simulating the interface between steel pipe and concrete.

Abstract

This invention relates to a method and apparatus for simulating the interface between a steel pipe and concrete. The method includes: acquiring multiple material parameters of the steel pipe and concrete, and constructing a finite element model based on them; the material parameters include normal stiffness, tangential stiffness, and interface parameters; applying a load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface based on the material parameters; determining whether to increase the load based on a preset load value; if the load does not reach the preset value, determining whether the interface has failed due to adhesion based on the interface parameters; based on the determination of adhesion failure, selecting the Coulomb penalty function method or tangential stiffness to calculate the tangential stress of the interface, and continuing to increase the load until the load reaches the preset value; outputting a mechanical contour map of the process of the interface load reaching the preset value. This invention considers the coupling relationship between the normal constitutive and tangential slip constitutive structures of the steel pipe-concrete interface, and controls its tangential mechanical behavior through the interface normal gap, thereby improving the accuracy and realism of the simulation.

Description

Technical Field

[0001] This invention belongs to the field of materials simulation and calculation technology, specifically relating to a simulation method and apparatus for the interface between steel pipe and concrete, and more particularly to a simulation method and apparatus for the interface between steel pipe and concrete that considers the voiding effect. Background Technology

[0002] Under temperature loads caused by sunlight or long-term shrinkage and creep, due to the different shrinkage rates of steel and concrete, voids inevitably occur in concrete-filled steel tube components or structures. This leads to a decrease in the synergistic performance of the steel tube and concrete, and consequently, a reduction in their stiffness and load-bearing capacity. Therefore, accurately simulating the performance of the steel-concrete interface in concrete-filled steel tube components or structures, considering the void effect, is the primary task in the performance research of concrete-filled steel tube components or structures.

[0003] Currently, there are two main methods for simulating the steel-concrete interface in steel-concrete composite members: (1) setting the steel pipe and concrete to be unbonded at the void position and setting the steel pipe and concrete to be bonded in good condition at the non-void position; (2) using contact elements to simulate the interface performance, considering the tangential behavior through the penalty function method and friction coefficient when the steel pipe is in contact with the concrete, and the bonding performance is zero when there is no contact. Summary of the Invention

[0004] To improve the accuracy and realism of simulating steel-concrete interfaces, a method for simulating steel-concrete interfaces is provided in a first aspect of this invention. The method includes: acquiring multiple material parameters of the steel pipe and concrete, and constructing a finite element model based on the multiple material parameters; the material parameters include normal stiffness, tangential stiffness, and interface parameters; applying a load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface in real time based on the normal stiffness and the tangential stiffness; determining whether to increase the load based on a preset load value: if the load does not reach the preset value, determining whether the interface has failed to bond based on the interface parameters; otherwise, stopping the increase of the load; based on the determination of bonding failure, selecting the Coulomb penalty function method or tangential stiffness to calculate the tangential stress of the interface, while continuing to increase the load until the load reaches the preset value; and outputting load and displacement diagrams, stress contour diagrams, strain contour diagrams, and displacement contour diagrams during the process of the interface load reaching the preset value.

[0005] In some embodiments of the present invention, the real-time calculation of the normal stress and tangential stress of the interface based on the normal stiffness and the tangential stiffness includes: if the interface is not under pressure, calculating the normal stress and tangential stress of the interface based on preset normal stiffness and preset tangential stiffness respectively; if the interface is under pressure, calculating the tangential stress based on preset normal stiffness and Coulomb penalty function method, and calculating the normal stress of the interface based on contact compressive stress and normal stiffness.

[0006] In some embodiments of the present invention, the step of determining whether the interface has failed to bond based on interface parameters includes: determining whether the interface has failed to bond based on the normal gap and the amount of bonding slippage of the interface; and determining whether the interface has failed to bond based on the normal gap of the interface.

[0007] Furthermore, the step of determining whether the interface has failed to bond based on the normal gap and adhesive slippage includes: if the normal gap is greater than a first preset value and less than a second preset value, and the adhesive slippage reaches a threshold, then the interface is determined to have failed to bond.

[0008] Furthermore, determining whether the interface has failed to bond based on the normal gap of the interface includes: if the normal gap is greater than a second preset value, then the interface is determined to have failed to bond.

[0009] In some embodiments of the present invention, the step of selecting the Coulomb penalty function method or the tangential stress of the interface based on the determination result of adhesive failure, and continuing to increase the load until the load reaches a preset value, includes: if adhesive failure occurs, continuing to increase the load to the preset value, and calculating the real-time load using the stress based on the Coulomb penalty function method; if adhesive failure does not occur, applying the load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface in real time according to the normal stiffness and the tangential stiffness.

[0010] In a second aspect, the present invention provides a simulation device for a steel pipe-concrete interface, comprising: an acquisition module for acquiring multiple material parameters of the steel pipe and concrete, and constructing a finite element model based on the multiple material parameters; the material parameters include normal stiffness, tangential stiffness, and interface parameters; a calculation module for applying a load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface in real time based on the normal stiffness and the tangential stiffness; a first judgment module for determining whether to increase the load based on a preset value of the load: if the load does not reach the preset value, determining whether the interface has failed to bond based on the interface parameters; otherwise, stopping the increase of the load; a second judgment module for selecting the Coulomb penalty function method or tangential stiffness to calculate the tangential stress of the interface based on the judgment result of bonding failure, and continuing to increase the load until the load reaches the preset value; and an output module for outputting load and displacement diagrams, stress cloud diagrams, strain cloud diagrams, and displacement cloud diagrams during the process of the load reaching the preset value at the interface.

[0011] Furthermore, the calculation module includes: a first calculation unit, used to calculate the normal stress and tangential stress of the interface according to a preset normal stiffness and a preset tangential stiffness respectively if the interface is not under pressure; and a second calculation unit, used to calculate the tangential stress according to the preset normal stiffness and the Coulomb penalty function method, and to calculate the normal stress of the interface according to the contact compressive stress and the normal stiffness if the interface is under pressure.

[0012] A third aspect of the present invention provides an electronic device comprising: one or more processors; and a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement a method for simulating a steel pipe-concrete interface provided in the first aspect of the present invention.

[0013] In a fourth aspect, the present invention provides a computer-readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a method for simulating a steel pipe-concrete interface provided in the first aspect of the present invention.

[0014] The beneficial effects of this invention are: This invention relates to a method and apparatus for simulating the interface between a steel pipe and concrete. The method includes: acquiring multiple material parameters of the steel pipe and concrete, and constructing a finite element model based on them; the material parameters include normal stiffness, tangential stiffness, and interface parameters; applying a load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface based on the material parameters; determining whether to increase the load based on a preset load value; if the load does not reach the preset value, determining whether the interface has failed due to adhesion based on the interface parameters; based on the determination of adhesion failure, selecting the Coulomb penalty function method or tangential stiffness to calculate the tangential stress of the interface, and continuing to increase the load until the load reaches the preset value; outputting a mechanical contour map of the process of the interface load reaching the preset value. It can be seen that this invention considers the coupling relationship between the normal constitutive and tangential slip constitutive structures of the steel pipe-concrete interface, controls its tangential mechanical behavior through the interface normal gap, and simulates various situations of the steel pipe-concrete interface through the calculation of interface parameters and different tangential stresses, thereby improving the accuracy and realism of the simulation. Attached Figure Description

[0015] Figure 1 This is a basic flowchart illustrating the simulation method of the steel pipe-concrete interface in some embodiments of the present invention. Figure 2 This is a schematic diagram illustrating the specific process of simulating the interface between steel pipe and concrete in some embodiments of the present invention. Figure 3 This is one of the schematic diagrams illustrating the specific process of simulating the interface between a steel pipe and concrete in some embodiments of the present invention; Figure 4 This is a second schematic diagram illustrating the specific process of simulating the interface between steel pipe and concrete in some embodiments of the present invention. Figure 5 This is a schematic diagram of a finite element model of a concrete-filled steel tube column in some embodiments of the present invention; Figure 6 These are cloud diagrams of the interface normal void space and tangential stress in concrete-filled steel tube columns in some embodiments of the present invention. Figure 7 This is a schematic diagram illustrating the trend of load-bearing capacity of steel tube and concrete in a steel-concrete composite column over time in some embodiments of the present invention. Figure 8 This is a schematic diagram of the structure of a simulation device for the interface between a steel pipe and concrete in some embodiments of the present invention; Figure 9 This is a schematic diagram of the structure of an electronic device in some embodiments of the present invention. Detailed Implementation

[0016] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0017] refer to Figure 1 , Figure 2 and Figure 5 In a first aspect of the present invention, a method for simulating the interface between a steel pipe and concrete is provided, comprising: S100. acquiring multiple material parameters of the steel pipe and concrete, and constructing a finite element model based on the multiple material parameters; the material parameters include normal stiffness, tangential stiffness, and interface parameters; S200. applying a load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface in real time based on the normal stiffness and the tangential stiffness; S300. determining whether to increase the load based on a preset value of the load: if the load does not reach the preset value, determining whether the interface has failed to bond based on the interface parameters; otherwise, stopping the increase of the load; S400. based on the determination result of bonding failure, selecting the Coulomb penalty function method or tangential stiffness to calculate the tangential stress of the interface, and continuing to increase the load until the load reaches the preset value; S500. outputting the load and displacement diagram, stress cloud diagram, strain cloud diagram, and displacement cloud diagram during the process of the load on the interface reaching the preset value.

[0018] It should be noted that in materials science, an interface refers to the region where different substances or materials come into contact. Interfaces are crucial in fields such as composite materials, multiphase materials, and nanomaterials because they often determine a range of material properties, including mechanical, electrical, and thermal properties. In this invention, the interface refers to the region where a steel pipe contacts concrete.

[0019] In step S100 of some embodiments of the present invention, multiple material parameters of the steel pipe and concrete are obtained, and a finite element model is constructed based on the multiple material parameters; specifically, a finite element model is established on the ABAQUS platform according to the relevant parameters of the calculation example, and the relevant material parameters are input, including the interface parameters in the Uinter subroutine ( d max=0.1mm); It should be noted that although the finite element model is constructed using the ABAQUS platform in this invention, it does not affect the realization of material models of steel pipes and concrete using other finite element simulation software.

[0020] Therefore, relevant loads are applied to the finite element model of the steel pipe and concrete structure to increase the load. ΔP Based on the given normal stiffness kn and tangential stiffness kt Calculate the interface normal and tangential stresses. (Reference) Figure 3 and Figure 4 In step S200 of some embodiments of the present invention, the real-time calculation of the normal stress and tangential stress of the interface based on the normal stiffness and the tangential stiffness includes: S201. If the interface is not under pressure, calculate the normal stress and tangential stress of the interface according to the preset normal stiffness and preset tangential stiffness respectively; S202. If the interface is under pressure, the tangential stress is calculated based on the preset normal stiffness and Coulomb penalty function method, and the normal stress of the interface is calculated based on the contact compressive stress and normal stiffness.

[0021] Specifically, if the interface is under pressure, frictional force must also be considered in the tangential direction, which is calculated using the Coulomb penalty function method based on the friction coefficient µ, and the contact compressive stress. P com Based on the given normal stiffness k n Sure.

[0022] In materials design optimization, penalty functions can serve as design requirements or constraints, such as material strength, weight, or cost. While this disclosure uses the Coulomb penalty function method as an example, it does not preclude those skilled in the art from simulating the gradual stress process on an interface using other penalty functions or constraints.

[0023] In step S300 of some embodiments of the present invention, determining whether the interface adhesion has failed based on interface parameters includes: S301. Determine whether the interface has failed to bond based on the normal gap and adhesive slippage of the interface. S302. Determine whether the interface has failed to bond based on the normal gap of the interface.

[0024] Furthermore, the step of determining whether the interface has failed to bond based on the normal gap and adhesive slippage includes: if the normal gap is greater than a first preset value and less than a second preset value, and the adhesive slippage reaches a threshold, then the interface is determined to have failed to bond.

[0025] Specifically, refer to Figure 2 and Figure 5The constitutive model of the steel-concrete interface considering the voiding effect is divided into three cases: (1) When the normal clearance is less than zero, both adhesion and friction exist, and slip is considered only in a linear constitutive model. The tangential stiffness is k t The friction is determined using the Coulomb friction method based on the contact compressive stress. P com The coefficient of friction is calculated to be... µ When the bond slip value s Greater than smax At that time, only friction exists; (2) When the normal gap d Greater than d 0 less than d max Bonding exists but friction does not; slip is considered only in a linear elastic constitutive model; tangential stiffness is... k t When the adhesive slip value (adhesive slip amount) is... s Greater than s max At that time, the bond stress is zero; (3) When the normal gap d Greater than d max At this point, neither bonding nor friction exists, and the bonding stress is zero.

[0026] refer to Figure 4 In step S400 of some embodiments of the present invention, the step of selecting the tangential stress of the Coulomb penalty function method or the tangential stiffness calculation interface based on the determination result of adhesive failure, and continuing to increase the load until the load reaches a preset value, includes: S401. If the bond fails, continue to increase the load to the preset value and calculate the load in real time using the stress calculation based on the Coulomb penalty function method; specifically, if the bond fails, increase (gradually) the load. ΔP If the interface is under pressure, based on the Uinter subroutine and the ABAQUS solver, according to the friction coefficient... µ Tangential stress and contact compressive stress are calculated using the Coulomb penalty function method. P com Based on the given normal stiffness k n Sure.

[0027] S402. If the bond has not failed, apply a load to the finite element model, and simultaneously calculate the normal and tangential stresses of the interface in real time based on the normal and tangential stiffness. That is, if the bond has not failed, proceed to step S200.

[0028] In step S500 of some embodiments of the present invention, load and displacement diagrams, stress contour diagrams, strain contour diagrams, and displacement contour diagrams are output during the process of the load on the output interface reaching a preset value. In addition, graphical representations of material properties, such as temperature contour diagrams and pressure contour diagrams, can be output via finite element software.

[0029] In a specific embodiment of the present invention, the following steps are included: Step 1: Establish a finite element model on the ABAQUS platform according to the relevant parameters of the calculation example, and input the relevant material parameters, including the interface parameters in the Uinter subroutine; Step 2: Apply relevant loads to increase the load. ΔP Based on the given normal stiffness kn and tangential stiffness kt The interface normal and tangential stresses are calculated using the Uinter subroutine and the ABAQUS solver.

[0030] If the interface is under pressure, frictional force must also be considered in the tangential direction, based on the coefficient of friction. µ The contact compressive stress was calculated using the Coulomb penalty function method. P com Based on the given normal stiffness k n Sure.

[0031] If the interface normal gap d achieve d max Or adhesive slip s achieve s max If the load reaches the set target, the program proceeds to step 3; otherwise, the program repeats step 2. When the load reaches the set target, the program proceeds to step 4. Step 3: Bond failure, increase load ΔP. If the interface is under pressure, based on the Uinter subroutine and ABAQUS solver, calculate the friction coefficient. µ Tangential stress and contact compressive stress are calculated using the Coulomb penalty function method. P com Based on the given normal stiffness kn Confirmed. When the load reaches the set target, the program proceeds to step 4; Step 4: The program ends and outputs load-displacement diagrams, stress, strain, displacement, and other contour maps.

[0032] Depend on Figure 6 It can be seen that in the region of the steel-concrete composite column where the interface normal gap is greater than 0.1 mm, the tangential stress is zero, which is consistent with the law that the interface normal gap controls its tangential mechanical behavior.

[0033] Depend on Figure 7It can be seen that during the process of the steel tube wall of the concrete-filled steel tube column bearing vertical loads, the load borne by the steel tube gradually increases, while the load borne by the concrete increases first, and reaches its maximum as the interface bond slips. u max Subsequently, it gradually decreases; when considering the shrinkage caused by temperature load, the interface normal clearance exceeds... d max As the range of the load gradually increases, the load-bearing capacity of the steel pipe continuously increases, while the load-bearing capacity of the concrete gradually decreases. These patterns of change are consistent with the mechanical behavior of the steel pipe-concrete interface constitutive model in this invention.

[0034] Example 2 refer to Figure 8 In a second aspect, the present invention provides a simulation device 1 for a steel pipe-concrete interface, comprising: an acquisition module 11 for acquiring multiple material parameters of the steel pipe and concrete, and constructing a finite element model based on the multiple material parameters; the material parameters include normal stiffness, tangential stiffness, and interface parameters; a calculation module 12 for applying a load to the finite element model, and simultaneously calculating the normal stress and tangential stress of the interface in real time based on the normal stiffness and the tangential stiffness; a first judgment module 13 for determining whether to increase the load based on a preset value of the load: if the load does not reach the preset value, determining whether the interface has failed to bond based on the interface parameters; otherwise, stopping the increase of the load; a second judgment module 14 for selecting the Coulomb penalty function method or tangential stiffness to calculate the tangential stress of the interface based on the judgment result of bonding failure, and continuing to increase the load until the load reaches the preset value; and an output module 15 for outputting load and displacement diagrams, stress cloud diagrams, strain cloud diagrams, and displacement cloud diagrams during the process of the load reaching the preset value of the interface.

[0035] Furthermore, the calculation module 12 includes: a first calculation unit, used to calculate the normal stress and tangential stress of the interface according to a preset normal stiffness and a preset tangential stiffness respectively if the interface is not under pressure; and a second calculation unit, used to calculate the tangential stress according to the preset normal stiffness and the Coulomb penalty function method, and to calculate the normal stress of the interface according to the contact compressive stress and the normal stiffness if the interface is under pressure.

[0036] Example 3 refer to Figure 9 A third aspect of the present invention provides an electronic device comprising: one or more processors; and a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method for simulating the steel pipe-concrete interface of the first aspect of the present invention.

[0037] Electronic device 500 may include a processing unit (e.g., a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 502 or a program loaded from storage device 508 into random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of electronic device 500. The processing unit 501, ROM 502, and RAM 503 are interconnected via bus 504. An input / output (I / O) interface 505 is also connected to bus 504.

[0038] Typically, the following devices can be connected to I / O interface 505: input devices 506 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 507 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 508 including, for example, hard disks; and communication devices 509. Communication device 509 allows electronic device 500 to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 9 An electronic device 500 with various devices is shown; however, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively. Figure 9 Each box shown can represent a device or multiple devices as needed.

[0039] Specifically, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 509, or installed from a storage device 508, or installed from a ROM 502. When the computer program is executed by a processing device 501, it performs the functions defined in the methods of embodiments of this disclosure. It should be noted that the computer-readable medium described in embodiments of this disclosure can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In embodiments of this disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In embodiments of this disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0040] The aforementioned computer-readable medium may be included in the aforementioned electronic device; or it may exist independently and not assembled into the electronic device. The aforementioned computer-readable medium carries one or more computer programs, which, when executed by the electronic device, cause the electronic device to: Computer program code for performing the operations of embodiments of this disclosure can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, C++, and Python—and conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0041] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for simulating the interface between a steel pipe and concrete, characterized in that, include: Multiple material parameters of the steel pipe and concrete are obtained, and a finite element model is constructed based on the multiple material parameters; the material parameters include normal stiffness, tangential stiffness, and interface parameters; A load is applied to the finite element model, and the normal stress and tangential stress of the interface are calculated in real time based on the normal stiffness and the tangential stiffness. Determine whether to increase the load based on the preset load value: if the load does not reach the preset value, determine whether the interface has failed to adhere based on the interface parameters. Otherwise, stop increasing the load; The step of determining whether the interface has failed to adhere based on interface parameters includes: determining whether the interface has failed to adhere based on the normal gap and the amount of adhesive slip; determining whether the interface has failed to adhere based on the normal gap; wherein, determining whether the interface has failed to adhere based on the normal gap and the amount of adhesive slip includes: if the normal gap is greater than a first preset value and less than a second preset value, and the amount of adhesive slip reaches a threshold, then the interface is determined to have failed to adhere; wherein, determining whether the interface has failed to adhere based on the normal gap includes: if the normal gap is greater than a second preset value, then the interface is determined to have failed to adhere. Based on the judgment result of adhesive failure, the Coulomb penalty function method or the tangential stress of the tangential stiffness calculation interface is selected, and the load is continued to be increased until the load reaches the preset value. The output interface displays load and displacement diagrams, stress contour diagrams, strain contour diagrams, and displacement contour diagrams during the process of the load reaching the preset value.

2. The method for simulating the interface between steel pipe and concrete according to claim 1, characterized in that, The real-time calculation of the normal stress and tangential stress of the interface based on the normal stiffness and the tangential stiffness includes: If the interface is not under pressure, the normal stress and tangential stress of the interface are calculated according to the preset normal stiffness and preset tangential stiffness, respectively. If the interface is under pressure, the tangential stress is calculated based on the preset normal stiffness and the Coulomb penalty function method, and the normal stress of the interface is calculated based on the contact compressive stress and the normal stiffness.

3. The method for simulating the interface between steel pipe and concrete according to claim 1, characterized in that, Based on the judgment result of adhesive failure, the tangential stress of the Coulomb penalty function method or tangential stiffness calculation interface is selected, and the load is continued to be increased until the load reaches the preset value, including: If the bond fails, the load is increased to the preset value, and the real-time load is calculated using the stress calculation method based on the Coulomb penalty function. If the bond does not fail, a load is applied to the finite element model, and the normal and tangential stresses of the interface are calculated in real time based on the normal stiffness and the tangential stiffness.

4. A device for simulating the interface between a steel pipe and concrete, characterized in that, include: The acquisition module is used to acquire multiple material parameters of the steel pipe and concrete, and construct a finite element model based on the multiple material parameters; the material parameters include normal stiffness, tangential stiffness and interface parameters; The calculation module is used to apply loads to the finite element model and simultaneously calculate the normal stress and tangential stress of the interface in real time based on the normal stiffness and the tangential stiffness. The first judgment module is used to determine whether to increase the load based on the preset value of the load: if the load does not reach the preset value, it determines whether the interface has failed to adhere based on the interface parameters. Otherwise, stop increasing the load; The step of determining whether the interface has failed to adhere based on interface parameters includes: determining whether the interface has failed to adhere based on the normal gap and the amount of adhesive slip; determining whether the interface has failed to adhere based on the normal gap; wherein, determining whether the interface has failed to adhere based on the normal gap and the amount of adhesive slip includes: if the normal gap is greater than a first preset value and less than a second preset value, and the amount of adhesive slip reaches a threshold, then the interface is determined to have failed to adhere; wherein, determining whether the interface has failed to adhere based on the normal gap includes: if the normal gap is greater than a second preset value, then the interface is determined to have failed to adhere. The second judgment module is used to select the Coulomb penalty function method or the tangential stress of the tangential stiffness calculation interface based on the judgment result of adhesive failure, and continue to increase the load until the load reaches the preset value. The output module is used to output the load and displacement diagrams, stress contour diagrams, strain contour diagrams, and displacement contour diagrams of the interface during the process of the load reaching the preset value.

5. The simulation device for the steel pipe-concrete interface according to claim 4, characterized in that, The computing module includes: The first calculation unit is used to calculate the normal stress and tangential stress of the interface based on the preset normal stiffness and preset tangential stiffness, respectively, if the interface is not under pressure. The second calculation unit is used to calculate the tangential stress based on the preset normal stiffness and Coulomb penalty function method if the interface is under pressure, and to calculate the normal stress of the interface based on the contact compressive stress and normal stiffness.

6. An electronic device, comprising: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the one or more processors to implement the simulation method for the steel pipe-concrete interface as described in any one of claims 1 to 3.

7. A computer-readable medium having a computer program stored thereon, wherein, When the computer program is executed by a processor, it implements the method for simulating the steel pipe-concrete interface as described in any one of claims 1 to 3.

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