A concrete crack design method, device, equipment, medium and product

Abstract

This invention discloses a method, apparatus, equipment, medium, and product for designing concrete cracks. The method includes: obtaining the maximum free tensile strain and allowable crack width limit of concrete, and determining the minimum crack distribution density based on these limits; characterizing the foundation crack distribution density (without considering fiber influence) through reinforcement parameters based on the mechanical balance between steel bond strength and concrete tensile bearing capacity; characterizing the fiber influence factor used to amplify the foundation crack distribution density through fiber reinforcement parameters based on the fiber reinforcement mechanism for controlling crack distribution; using the product of the foundation crack distribution density and the fiber influence factor as the target crack distribution density; selecting reinforcement parameters and fiber reinforcement parameters with the goal of ensuring the target crack distribution density is not less than the minimum crack distribution density, and generating corresponding reinforcement and fiber addition schemes. This method enables precise and proactive control of concrete crack morphology.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of building construction technology, and in particular to a method, apparatus, equipment, medium and product for designing concrete cracks. Background Technology

[0002] Currently, concrete crack control design typically focuses on crack width as the core indicator. This method is essentially a passive verification model based on the results. Crack width is a local strain manifestation after crack formation, exhibiting strong locality and randomness. It is easily affected by various instantaneous factors such as the heterogeneity of concrete materials and microenvironment fluctuations, leading to significant deviations between design predictions and actual engineering results. This makes it difficult to achieve precise and proactive control of crack morphology. Summary of the Invention

[0003] This invention provides a method, apparatus, equipment, medium, and product for designing concrete cracks, which can achieve precise and proactive control of concrete crack morphology and improve the reliability and stability of concrete crack control.

[0004] In a first aspect, embodiments of the present invention provide a concrete crack design method, comprising: Obtain the maximum free tensile strain and allowable crack width limit of concrete, and determine the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit of concrete; Based on the mechanical balance between the bond strength of steel bars and the tensile bearing capacity of concrete, the distribution density of foundation cracks without considering the influence of fibers is characterized by reinforcement parameters. Based on the mechanism by which fiber reinforcement regulates crack distribution, the fiber influence factor used to amplify the crack distribution density of the foundation is characterized by fiber reinforcement parameters. The product of the basic crack distribution density and the fiber influence factor is used as the target crack distribution density. With the goal of the target crack distribution density being no less than the minimum crack distribution density, the reinforcement parameters and the fiber reinforcement parameters are selected to generate the corresponding reinforcement scheme and fiber addition scheme.

[0005] Furthermore, determining the minimum crack distribution density based on the maximum free tensile strain of the concrete and the allowable crack width limit includes: The ratio of the maximum free tensile strain of the concrete to the allowable crack width limit is taken as the minimum crack distribution density.

[0006] Furthermore, the reinforcement parameters include at least the average bond stress between the steel bars and the concrete, the sum of the perimeters of all steel bars per unit width, the tensile strength of the concrete, and the tensile area of ​​the concrete effectively confined by the steel bars. Based on the mechanical equilibrium of steel bond strength and concrete tensile bearing capacity, the density of foundation crack distribution without considering fiber influence is characterized by reinforcement parameters, including: The bond strength of the reinforcing steel is characterized by the sum of the average bond stress, the perimeter, and the density of crack distribution in the foundation. The tensile bearing capacity of the concrete is characterized by the tensile strength of the concrete and the tensile area of ​​the concrete. The bond strength of the steel reinforcement and the tensile bearing capacity of the concrete are brought into mechanical equilibrium, and the crack distribution density of the foundation is obtained by equation deformation.

[0007] Furthermore, the fiber reinforcement parameters include at least fiber volume fraction, fiber aspect ratio, and a comprehensive efficiency coefficient calibrated by the fiber volume fraction and the fiber aspect ratio; Based on the mechanism by which fiber reinforcement regulates crack distribution, fiber influence factors used to amplify the crack distribution density in the foundation are characterized by fiber reinforcement parameters, including: The fiber influence factor is obtained by adding one to the product of the fiber volume fraction, the fiber aspect ratio, and the overall efficiency coefficient.

[0008] Furthermore, selecting the reinforcement parameters and the fiber reinforcement parameters includes: Obtain historical working conditions that match the maximum free tensile strain of the concrete and the allowable crack width limit, wherein the historical working conditions correspond to historical crack distribution density, historical reinforcement parameters and historical fiber reinforcement parameters; If the historical crack distribution density is lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by increasing at least one of the following: the sum of the historical perimeters of all steel bars per unit width in the historical reinforcement parameters, the historical fiber volume fraction in the historical fiber reinforcement parameters, and the historical fiber aspect ratio in the historical fiber reinforcement parameters. If the historical crack distribution density is not lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by reducing at least one of the historical perimeter sum, the historical fiber volume fraction, and the historical fiber aspect ratio.

[0009] Furthermore, the method also includes: The measured crack distribution density after the combined construction of the reinforcement scheme and the fiber addition scheme is obtained, and the measured crack distribution density is compared with the target crack distribution density to verify the concrete crack control effect.

[0010] Secondly, embodiments of the present invention provide a concrete crack design device, comprising: The first processing module is used to obtain the maximum free tensile strain and allowable crack width limit of concrete, and to determine the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit of concrete. The second processing module is used to characterize the distribution density of foundation cracks without considering the influence of fibers by using reinforcement parameters based on the mechanical balance between the bond strength of steel bars and the tensile bearing capacity of concrete. The third processing module is used to characterize the fiber influence factor used to amplify the basic crack distribution density by means of fiber reinforcement parameters, based on the mechanism of fiber reinforcement on crack distribution. The fourth processing module is used to take the product of the basic crack distribution density and the fiber influence factor as the target crack distribution density, and with the target crack distribution density not being less than the minimum crack distribution density as the objective, select the reinforcement parameters and the fiber reinforcement parameters to generate the corresponding reinforcement scheme and fiber addition scheme.

[0011] Thirdly, embodiments of the present invention provide an electronic device, including: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the method as described in the first aspect.

[0012] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions that cause a processor to execute the method described in the first aspect.

[0013] Fifthly, embodiments of the present invention provide a computer program product, the computer program product including a computer program, which, when executed by a processor, implements the method described in the first aspect.

[0014] The technical solution of this invention obtains the maximum free tensile strain and allowable crack width limit of concrete, and determines the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit. Based on the mechanical balance between steel reinforcement bond strength and concrete tensile bearing capacity, the foundation crack distribution density is characterized by reinforcement parameters without considering fiber influence. Based on the fiber reinforcement's control mechanism on crack distribution, fiber reinforcement parameters are used to characterize the fiber influence factor used to amplify the foundation crack distribution density. The product of the foundation crack distribution density and the fiber influence factor is used as the target crack distribution density. With the goal of the target crack distribution density being no less than the minimum crack distribution density, the reinforcement parameters and fiber reinforcement parameters are selected to generate corresponding reinforcement schemes and fiber addition schemes. This solution shifts the core of concrete crack design from the localized random result of crack width to the crack distribution density directly determined by materials and structure. By establishing a quantitative relationship between concrete strain, allowable crack width, and crack density, and combining the synergistic design of reinforcement parameters and fiber reinforcement parameters, the target crack distribution density is accurately determined, thereby achieving precise and proactive control of concrete crack morphology and improving the reliability and stability of concrete crack control.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0017] Figure 1 This is a flowchart of a concrete crack design method provided in Embodiment 1 of the present invention; Figure 2 This is a structural schematic diagram of a concrete crack design device according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device that implements an embodiment of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., used in this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] Example 1 Figure 1 This is a flowchart of a concrete crack design method according to Embodiment 1 of the present invention. This embodiment is applicable to situations involving concrete crack design. The method can be executed by a concrete crack design device, which can be implemented in software and / or hardware and integrated into an electronic device. Furthermore, the electronic device includes, but is not limited to, computers, laptops, etc.

[0021] like Figure 1 As shown, the method includes: S110. Obtain the maximum free tensile strain and allowable crack width limit of concrete, and determine the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit of concrete.

[0022] The maximum free tensile strain of concrete can be the maximum tensile deformation capacity that a concrete member is expected to produce under specific constraints. It is a key parameter reflecting the inherent tensile properties of concrete materials, and this parameter can be determined by experimental testing.

[0023] The permissible crack width limit is a crack width control threshold predetermined based on the service environment, durability requirements, and design specifications of the concrete structure, used to ensure the long-term normal service performance of the structure.

[0024] Minimum crack distribution density is the lowest density threshold determined based on the maximum free tensile strain of concrete and the allowable crack width limit, which meets the requirements for crack width control and serves as a constraint condition for subsequent crack control design. Crack distribution density is a quantitative indicator characterizing the density and uniformity of cracks on the surface of a concrete member. It reflects the number of cracks distributed per unit length and is used to describe the overall crack morphology characteristics of concrete.

[0025] In this step, the minimum crack distribution density can be determined based on the ratio of the maximum free tensile strain of concrete to the allowable crack width limit.

[0026] S120. Based on the mechanical balance between the bond strength of steel bars and the tensile bearing capacity of concrete, the distribution density of foundation cracks without considering the influence of fibers is characterized by reinforcement parameters.

[0027] Reinforcement parameters can be relevant parameters that characterize the configuration of steel bars, and are used to reflect the influence of the arrangement and quantity of steel bars on the crack distribution pattern. No limitation is made here.

[0028] In actual working conditions, when steel reinforcement and concrete work together, the bond between the steel reinforcement and the concrete constrains the tensile deformation of the concrete, thus affecting the generation and distribution of cracks. The tensile bearing capacity of the concrete itself determines its ability to resist cracking. When the bond force between the steel reinforcement and the tensile bearing capacity of the concrete reach a mechanical equilibrium, the distribution of cracks will reach a stable state.

[0029] In this step, the bond strength of the reinforcing steel can be characterized by parameters reflecting bond performance in the reinforcement parameters, combined with the foundation crack distribution density; the tensile capacity of the concrete can be characterized by parameters reflecting tensile performance in the reinforcement parameters; based on the stable mechanical equilibrium relationship between the bond strength of the reinforcing steel and the tensile capacity of the concrete, the mechanical equilibrium equation is converted into the foundation crack distribution density characterized by the reinforcement parameters. The foundation crack distribution density is the benchmark crack distribution density characterized by the reinforcement parameters without considering the effect of fiber reinforcement, providing a calculation basis for determining the target crack distribution density.

[0030] S130. Based on the mechanism of fiber reinforcement in regulating crack distribution, the fiber influence factor used to amplify the crack distribution density of the foundation is characterized by fiber reinforcement parameters.

[0031] The mechanism by which fiber reinforcement regulates crack distribution can be understood as the intrinsic mechanism by which fibers in the concrete matrix inhibit crack propagation, refine crack distribution, and improve the uniformity and density of cracks through bridging and crack inhibition.

[0032] Fiber reinforcement parameters can be relevant parameters that characterize the fiber reinforcement effect, and are used to reflect the influence of fiber dosage, distribution morphology, etc. on the crack distribution control effect. No limitation is made here.

[0033] The fiber influence factor is a quantitative coefficient used to characterize the amplification effect of fiber reinforcement on crack distribution.

[0034] In this step, based on the mechanism by which fiber reinforcement regulates crack distribution, fiber reinforcement parameters are used to quantify the impact of fiber incorporation on crack distribution density, resulting in a fiber influence factor that can amplify the crack distribution density of the foundation. The core idea is to further densify and refine cracks by incorporating fibers, building upon the crack distribution density formed solely by reinforcement. This effectively amplifies the overall crack distribution density beyond the baseline value, thereby improving crack control without increasing reinforcement.

[0035] S140. The product of the basic crack distribution density and the fiber influence factor is taken as the target crack distribution density. With the target crack distribution density not being less than the minimum crack distribution density as the objective, the reinforcement parameters and the fiber reinforcement parameters are selected to generate the corresponding reinforcement scheme and fiber addition scheme.

[0036] The target crack distribution density is obtained by multiplying the basic crack distribution density with the fiber influence factor, which is characterized by the reinforcement parameters and fiber reinforcement parameters. The target crack distribution density is the crack distribution density that needs to be achieved through crack control.

[0037] In this step, the requirement that the target crack distribution density be no less than the minimum crack distribution density is used as a mandatory control requirement. Reinforcement parameters and fiber reinforcement parameters are selected through combination. Specifically, the crack distribution density of the foundation is changed by adjusting the reinforcement parameters, and the fiber influence factor is changed by adjusting the fiber reinforcement parameters. Different parameter combinations are substituted into the calculation to obtain the corresponding target crack distribution density. From this, the parameter combination that meets the crack control requirement is selected. Considering factors such as structural stress, construction conditions, and material costs, the optimal combination of reinforcement and fiber reinforcement parameters suitable for the current component is determined. Finally, the selected optimal reinforcement parameters directly constitute the reinforcement scheme, and the selected optimal fiber reinforcement parameters directly constitute the fiber addition scheme.

[0038] Optionally, when selecting the combination of reinforcement parameters and fiber reinforcement parameters, the target crack distribution density formed by the selected parameter combination can be equal to the minimum crack distribution density; or the target crack distribution density formed by the selected parameter combination can be greater than the minimum crack distribution density, but the density difference between the target crack distribution density and the minimum crack distribution density is lower than the set density difference threshold, that is, the target crack distribution density is as close as possible to the minimum crack distribution density.

[0039] Once the reinforcement scheme and fiber addition scheme are determined, the steel bars can be laid out according to the reinforcement scheme, and the concrete fiber can be mixed and poured according to the fiber addition scheme. Through the above construction process, the concrete component can form the target crack distribution density under actual stress, thereby achieving uniform and dense crack distribution and meeting the control requirement of not less than the minimum crack distribution density.

[0040] Optionally, the concrete crack control design in this invention can be a crack control design for large-volume high-strength concrete.

[0041] The technical solution of this invention obtains the maximum free tensile strain and allowable crack width limit of concrete, and determines the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit. Based on the mechanical balance between steel reinforcement bond strength and concrete tensile bearing capacity, the foundation crack distribution density is characterized by reinforcement parameters without considering fiber influence. Based on the fiber reinforcement's control mechanism on crack distribution, fiber reinforcement parameters are used to characterize the fiber influence factor used to amplify the foundation crack distribution density. The product of the foundation crack distribution density and the fiber influence factor is used as the target crack distribution density. With the goal of the target crack distribution density being no less than the minimum crack distribution density, the reinforcement parameters and fiber reinforcement parameters are selected to generate corresponding reinforcement schemes and fiber addition schemes. This solution shifts the core of concrete crack design from the localized random result of crack width to the crack distribution density directly determined by materials and structure. By establishing a quantitative relationship between concrete strain, allowable crack width, and crack density, and combining the synergistic design of reinforcement parameters and fiber reinforcement parameters, the target crack distribution density is accurately determined, thereby achieving precise and proactive control of concrete crack morphology and improving the reliability and stability of concrete crack control.

[0042] In one embodiment, determining the minimum crack distribution density based on the maximum free tensile strain of the concrete and the allowable crack width limit includes: The ratio of the maximum free tensile strain of the concrete to the allowable crack width limit is taken as the minimum crack distribution density.

[0043] That is, the minimum crack distribution density can be expressed as , This represents the maximum free tensile strain of the concrete. This is the allowable crack width limit.

[0044] In one embodiment, the reinforcement parameters include at least the average bond stress between the steel bars and the concrete, the sum of the perimeters of all steel bars per unit width, the tensile strength of the concrete, and the tensile area of ​​the concrete effectively confined by the steel bars. Based on the mechanical equilibrium of steel bond strength and concrete tensile bearing capacity, the density of foundation crack distribution without considering fiber influence is characterized by reinforcement parameters, including: The bond strength of the reinforcing steel is characterized by the sum of the average bond stress, the perimeter, and the density of crack distribution in the foundation. The tensile bearing capacity of the concrete is characterized by the tensile strength of the concrete and the tensile area of ​​the concrete. The bond strength of the steel reinforcement and the tensile bearing capacity of the concrete are brought into mechanical equilibrium, and the crack distribution density of the foundation is obtained by equation deformation.

[0045] Define the crack distribution density as ( (where the average crack spacing is ), and the length is selected as... Taking the tensile concrete as the object of analysis, the total force generated by all the steel bars in this section on the concrete through bond action, i.e., the steel bond force, is equal to the total tensile force that the concrete in this section can withstand when it reaches its tensile strength, i.e., the tensile bearing capacity of the concrete. Then the mechanical equilibrium equation is expressed as: ; Where, the left side of the equation represents the bond force of the reinforcing steel. This represents the average bond stress between the steel reinforcement and the concrete. It is the sum of the perimeters of all the steel bars within a unit width, which is a linear representation of the area of ​​action of the bond force (surface area of ​​the steel bars); The density of the basic crack distribution. The right side of the equation represents the tensile bearing capacity of the concrete. It refers to the tensile strength of concrete; This refers to the tensile area of ​​the concrete effectively restrained by the reinforcing steel.

[0046] The distribution density of foundation cracks was obtained by transforming the mechanical equilibrium equation. .

[0047] In one embodiment, the fiber reinforcement parameters include at least fiber volume fraction, fiber aspect ratio, and a comprehensive efficiency coefficient calibrated by the fiber volume fraction and the fiber aspect ratio; Based on the mechanism by which fiber reinforcement regulates crack distribution, fiber influence factors used to amplify the crack distribution density in the foundation are characterized by fiber reinforcement parameters, including: The fiber influence factor is obtained by adding one to the product of the fiber volume fraction, the fiber aspect ratio, and the overall efficiency coefficient.

[0048] That is, the fiber influence factor can be expressed as .in, The fiber volume fraction is the highest fiber content. The higher the fiber content, the stronger the bridging effect, which can inhibit crack propagation and promote stress redistribution, leading to more microcracks. The fiber aspect ratio is the ratio of the fiber diameter to the fiber diameter. The larger the fiber aspect ratio, the greater the work required to pull out the fiber, the higher the bridging efficiency, and the more obvious the suturing and bifurcation guidance effect on the crack. This is the comprehensive efficiency coefficient calibrated based on field tests using fiber volume fraction and fiber aspect ratio.

[0049] The product of the basic crack distribution density and the fiber influence factor is taken as the target crack distribution density, which is expressed as: .

[0050] In one embodiment, selecting the reinforcement parameters and the fiber reinforcement parameters includes: Obtain historical working conditions that match the maximum free tensile strain of the concrete and the allowable crack width limit, wherein the historical working conditions correspond to historical crack distribution density, historical reinforcement parameters and historical fiber reinforcement parameters; If the historical crack distribution density is lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by increasing at least one of the following: the sum of the historical perimeters of all steel bars per unit width in the historical reinforcement parameters, the historical fiber volume fraction in the historical fiber reinforcement parameters, and the historical fiber aspect ratio in the historical fiber reinforcement parameters. If the historical crack distribution density is not lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by reducing at least one of the historical perimeter sum, the historical fiber volume fraction, and the historical fiber aspect ratio.

[0051] First, based on the current design conditions of the component, namely the maximum free tensile strain of concrete and the allowable crack width limit, historical working conditions with matching conditions are selected from the historical engineering database. These historical working conditions correspond to a complete set of historical data, including: historical crack distribution density (i.e., the actual crack density formed under this condition), historical reinforcement parameters (the reinforcement parameters used in this condition, the core of which is the sum of the historical perimeters of all steel bars per unit width), and historical fiber reinforcement parameters (the fiber reinforcement parameters used in this condition, the core of which is the historical fiber volume fraction and historical fiber aspect ratio). Matching working conditions can be understood as the historical project and the current design being consistent or close in key mechanical and performance indicators such as the maximum free tensile strain of concrete and the allowable crack width limit, while also sharing essentially the same structural form, stress conditions, and service environment.

[0052] The current design's reinforcement and fiber reinforcement parameters are selected based on historical crack distribution densities and historical reinforcement parameters. Specifically, if the historical crack distribution density is lower than the minimum crack distribution density, at least one of the historical sum of perimeters, historical fiber volume fraction, and historical fiber aspect ratio needs to be increased so that the target crack distribution density corresponding to the adjusted parameters is not less than the minimum crack distribution density; conversely, at least one of the historical sum of perimeters, historical fiber volume fraction, and historical fiber aspect ratio needs to be decreased so that the target crack distribution density corresponding to the adjusted parameters is equal to the minimum crack distribution density, or the target crack distribution density is greater than the minimum crack distribution density and the density difference between the two is lower than a set density difference threshold.

[0053] Optionally, when increasing or decreasing at least one of the historical sum of circumference, historical fiber volume fraction, and historical fiber aspect ratio, the adjustment priority of historical fiber volume fraction and historical fiber aspect ratio is higher than the adjustment priority of historical sum of circumference.

[0054] In one embodiment, the method further includes: The measured crack distribution density after the combined construction of the reinforcement scheme and the fiber addition scheme is obtained, and the measured crack distribution density is compared with the target crack distribution density to verify the concrete crack control effect.

[0055] Reinforcing bars are laid out according to the reinforcement scheme determined in the current design, and concrete fiber mixing and pouring are carried out according to the fiber addition scheme determined in the current design. After the concrete structure reaches the predetermined age, the actual cracks generated in the components are detected, and the actual crack distribution density is obtained, i.e., the measured crack distribution density. This measured crack distribution density is compared with the target crack distribution density determined in the previous design. By judging the degree of deviation between the two, the crack control effect under the synergistic effect of reinforcement and fiber reinforcement is verified to see if it meets the design expectations.

[0056] Example 2 Figure 2 This is a structural schematic diagram of a concrete crack design device according to Embodiment 2 of the present invention. This embodiment can be applied to situations where concrete crack design is implemented, such as... Figure 2 As shown, the specific structure of the device includes: The first processing module 21 is used to obtain the maximum free tensile strain of concrete and the allowable crack width limit, and to determine the minimum crack distribution density based on the maximum free tensile strain of concrete and the allowable crack width limit. The second processing module 22 is used to characterize the distribution density of foundation cracks without considering the influence of fibers by using reinforcement parameters based on the mechanical balance between the bond strength of steel bars and the tensile bearing capacity of concrete. The third processing module 23 is used to characterize the fiber influence factor used to amplify the basic crack distribution density by means of fiber reinforcement parameters, based on the fiber reinforcement mechanism for regulating crack distribution. The fourth processing module 24 is used to take the product of the basic crack distribution density and the fiber influence factor as the target crack distribution density, and with the target crack distribution density not being less than the minimum crack distribution density as the objective, select the reinforcement parameters and the fiber reinforcement parameters to generate the corresponding reinforcement scheme and fiber addition scheme.

[0057] The concrete crack design device provided in this embodiment obtains the maximum free tensile strain and allowable crack width limit of concrete through a first processing module, and determines the minimum crack distribution density based on the maximum free tensile strain and the allowable crack width limit. A second processing module characterizes the foundation crack distribution density without considering fiber influence through reinforcement parameters based on the mechanical balance between steel bond strength and concrete tensile bearing capacity. A third processing module characterizes the fiber influence factor used to amplify the foundation crack distribution density through fiber reinforcement parameters based on the fiber reinforcement mechanism for controlling crack distribution. A fourth processing module uses the product of the foundation crack distribution density and the fiber influence factor as the target crack distribution density, aiming for the target crack distribution density to be no less than the minimum crack distribution density, and selects the reinforcement parameters and the fiber reinforcement parameters to generate corresponding reinforcement schemes and fiber addition schemes. This scheme shifts the core of concrete crack design from the localized random result of crack width to the crack distribution density directly determined by materials and structure. By establishing a quantitative relationship between concrete strain, allowable crack width, and crack density, and combining the synergistic design of reinforcement parameters and fiber reinforcement parameters, the target crack distribution density can be accurately determined, thereby achieving precise and proactive control of concrete crack morphology and improving the reliability and stability of concrete crack control.

[0058] Furthermore, the first processing module 21 is specifically used for: The ratio of the maximum free tensile strain of the concrete to the allowable crack width limit is taken as the minimum crack distribution density.

[0059] Furthermore, the reinforcement parameters include at least the average bond stress between the steel bars and the concrete, the sum of the perimeters of all steel bars per unit width, the tensile strength of the concrete, and the tensile area of ​​the concrete effectively confined by the steel bars. The second processing module 22 is specifically used for: The bond strength of the reinforcing steel is characterized by the sum of the average bond stress, the perimeter, and the density of crack distribution in the foundation. The tensile bearing capacity of the concrete is characterized by the tensile strength of the concrete and the tensile area of ​​the concrete. The bond strength of the steel reinforcement and the tensile bearing capacity of the concrete are brought into mechanical equilibrium, and the crack distribution density of the foundation is obtained by equation deformation.

[0060] Furthermore, the fiber reinforcement parameters include at least fiber volume fraction, fiber aspect ratio, and a comprehensive efficiency coefficient calibrated by the fiber volume fraction and the fiber aspect ratio; The third processing module 23 is specifically used for: The fiber influence factor is obtained by adding one to the product of the fiber volume fraction, the fiber aspect ratio, and the overall efficiency coefficient.

[0061] Furthermore, the fourth processing module 24 is specifically used for: Obtain historical working conditions that match the maximum free tensile strain of the concrete and the allowable crack width limit, wherein the historical working conditions correspond to historical crack distribution density, historical reinforcement parameters and historical fiber reinforcement parameters; If the historical crack distribution density is lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by increasing at least one of the following: the sum of the historical perimeters of all steel bars per unit width in the historical reinforcement parameters, the historical fiber volume fraction in the historical fiber reinforcement parameters, and the historical fiber aspect ratio in the historical fiber reinforcement parameters. If the historical crack distribution density is not lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by reducing at least one of the historical perimeter sum, the historical fiber volume fraction, and the historical fiber aspect ratio.

[0062] Furthermore, the device also includes: The verification module is used to obtain the measured crack distribution density after the reinforcement scheme and the fiber addition scheme are constructed in combination, and to compare the measured crack distribution density with the target crack distribution density to verify the concrete crack control effect.

[0063] The concrete crack design device provided in the embodiments of the present invention can execute the concrete crack design method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method.

[0064] Example 3 Figure 3This is a schematic diagram of the structure of an electronic device implementing embodiments of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0065] like Figure 3 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 performs various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0066] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0067] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as concrete crack design methods.

[0068] In some embodiments, the concrete crack design method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the concrete crack design method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the concrete crack design method by any other suitable means (e.g., by means of firmware).

[0069] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0070] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0071] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on 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 fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0072] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0073] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0074] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0075] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0076] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for designing concrete cracks, characterized in that, include: Obtain the maximum free tensile strain and allowable crack width limit of concrete, and determine the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit of concrete; Based on the mechanical balance between the bond strength of steel bars and the tensile bearing capacity of concrete, the distribution density of foundation cracks without considering the influence of fibers is characterized by reinforcement parameters. Based on the mechanism by which fiber reinforcement regulates crack distribution, the fiber influence factor used to amplify the crack distribution density of the foundation is characterized by fiber reinforcement parameters. The product of the basic crack distribution density and the fiber influence factor is used as the target crack distribution density. With the goal of the target crack distribution density being no less than the minimum crack distribution density, the reinforcement parameters and the fiber reinforcement parameters are selected to generate the corresponding reinforcement scheme and fiber addition scheme.

2. The method according to claim 1, characterized in that, Determining the minimum crack distribution density based on the maximum free tensile strain of the concrete and the allowable crack width limit includes: The ratio of the maximum free tensile strain of the concrete to the allowable crack width limit is taken as the minimum crack distribution density.

3. The method according to claim 1, characterized in that, The reinforcement parameters include at least the average bond stress between the steel bars and the concrete, the sum of the perimeters of all steel bars per unit width, the tensile strength of the concrete, and the tensile area of ​​the concrete effectively confined by the steel bars. Based on the mechanical equilibrium of steel bond strength and concrete tensile bearing capacity, the density of foundation crack distribution without considering fiber influence is characterized by reinforcement parameters, including: The bond strength of the reinforcing steel is characterized by the sum of the average bond stress, the perimeter, and the density of crack distribution in the foundation. The tensile bearing capacity of the concrete is characterized by the tensile strength of the concrete and the tensile area of ​​the concrete. The bond strength of the steel reinforcement and the tensile bearing capacity of the concrete are brought into mechanical equilibrium, and the crack distribution density of the foundation is obtained by equation deformation.

4. The method according to claim 1, characterized in that, The fiber reinforcement parameters include at least fiber volume fraction, fiber aspect ratio, and a comprehensive efficiency coefficient calibrated by the fiber volume fraction and the fiber aspect ratio; Based on the mechanism by which fiber reinforcement regulates crack distribution, fiber influence factors used to amplify the crack distribution density in the foundation are characterized by fiber reinforcement parameters, including: The fiber influence factor is obtained by adding one to the product of the fiber volume fraction, the fiber aspect ratio, and the overall efficiency coefficient.

5. The method according to claim 1, characterized in that, Selecting the reinforcement parameters and the fiber reinforcement parameters includes: Obtain historical working conditions that match the maximum free tensile strain of the concrete and the allowable crack width limit, wherein the historical working conditions correspond to historical crack distribution density, historical reinforcement parameters and historical fiber reinforcement parameters; If the historical crack distribution density is lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by increasing at least one of the following: the sum of the historical perimeters of all steel bars per unit width in the historical reinforcement parameters, the historical fiber volume fraction in the historical fiber reinforcement parameters, and the historical fiber aspect ratio in the historical fiber reinforcement parameters. If the historical crack distribution density is not lower than the minimum crack distribution density, then the reinforcement parameters and the fiber reinforcement parameters are selected by reducing at least one of the historical perimeter sum, the historical fiber volume fraction, and the historical fiber aspect ratio.

6. The method according to claim 1, characterized in that, Also includes: The measured crack distribution density after the combined construction of the reinforcement scheme and the fiber addition scheme is obtained, and the measured crack distribution density is compared with the target crack distribution density to verify the concrete crack control effect.

7. A concrete crack design device, characterized in that, include: The first processing module is used to obtain the maximum free tensile strain and allowable crack width limit of concrete, and to determine the minimum crack distribution density based on the maximum free tensile strain and allowable crack width limit of concrete. The second processing module is used to characterize the distribution density of foundation cracks without considering the influence of fibers by using reinforcement parameters based on the mechanical balance between the bond strength of steel bars and the tensile bearing capacity of concrete. The third processing module is used to characterize the fiber influence factor used to amplify the basic crack distribution density by means of fiber reinforcement parameters, based on the mechanism of fiber reinforcement on crack distribution. The fourth processing module is used to take the product of the basic crack distribution density and the fiber influence factor as the target crack distribution density, and with the target crack distribution density not being less than the minimum crack distribution density as the objective, select the reinforcement parameters and the fiber reinforcement parameters to generate the corresponding reinforcement scheme and fiber addition scheme.

8. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the method as described in any one of claims 1-6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1-6.

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