CN113076575B - High-speed rail bridge section simulation detection method based on direct-current path model - Google Patents
High-speed rail bridge section simulation detection method based on direct-current path model Download PDFInfo
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- CN113076575B CN113076575B CN202110290718.9A CN202110290718A CN113076575B CN 113076575 B CN113076575 B CN 113076575B CN 202110290718 A CN202110290718 A CN 202110290718A CN 113076575 B CN113076575 B CN 113076575B
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Abstract
The invention discloses a simulation detection method for a high-speed rail bridge section based on a direct-current path model, which comprises the steps of constructing a first local model of the high-speed rail bridge section based on actual steel bar distribution in a bridge, and optimizing the first local model by a sectional area method to obtain a second local model; calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model, and constructing an equivalent circuit of the second local model; and constructing a direct current path model of the high-speed rail bridge section according to the equivalent circuit, and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model. Compared with the modeling idea that the steel rail and the through ground wire are generally adopted as the model at present, the constructed model is more precise and accurate, the simulation result is richer, the direct current distribution condition of each part of the railway system can be obtained, and a powerful tool is provided for the whole internal voltage and current distribution of the high-speed rail bridge grounding system.
Description
Technical Field
The application relates to the technical field of railway grounding systems, in particular to a high-speed rail bridge section simulation detection method based on a direct-current path model.
Background
When a direct current source exists near the high-speed railway, the direct current in the ground flows into the comprehensive grounding system of the high-speed railway. In order to analyze the possible influence of the situation on the whole high-speed rail system, modeling simulation detection is required to be carried out on the high-speed rail grounding system.
At present, for the modeling of a high-speed rail comprehensive grounding system at home and abroad, a steel rail, a comprehensive through ground wire and a PW protection wire are generally taken as models of the whole system. The modeling is relatively simple, the structures of different sections of the railway grounding system are not distinguished, and all grounding facilities connected with the grounding system are not taken into consideration, so that a certain error exists in a simulation result. In addition, in order to obtain the dc current distribution of each part of the high-speed rail grounding system and ensure the accuracy of the simulation result, accurate modeling must be performed on the high-speed rail grounding system. However, the railway system has a complex structure, the difference of different sections is large, the span is usually dozens or hundreds of kilometers, and if the conventional method is adopted, the modeling workload is too large, and the efficiency is too low.
Disclosure of Invention
In order to solve the above problem, an embodiment of the present application provides a high-speed rail bridge section simulation detection method based on a direct current path model.
In a first aspect, an embodiment of the present invention provides a method for detecting a high-speed rail bridge section in a simulation manner based on a direct current path model, where the method includes:
constructing a first local model of a high-speed rail bridge section based on actual steel bar distribution in the bridge, and optimizing the first local model by a sectional area method to obtain a second local model;
calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model, and constructing an equivalent circuit of the second local model;
and constructing a direct current path model of the high-speed rail bridge section according to the equivalent circuit, and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model.
Preferably, the optimizing the first local model by a cross-sectional area method to obtain a second local model includes:
acquiring the spatial distribution of the reinforcing steel bars of the bridge part above the ground in the first partial model;
and equating a plurality of adjacent steel bars with the same extension direction in the spatial distribution of the steel bars into one steel bar with the same total sectional area to obtain a second local model.
Preferably, the calculating an equivalent dc resistance value and an equivalent ground resistance value of the second local model to construct an equivalent circuit of the second local model includes:
injecting unit current into the second local model to obtain voltage distribution and current distribution on the second local model;
calculating an equivalent direct current resistance value of a beam body arranged between two piers in the local model based on the voltage distribution and the current distribution;
respectively calculating equivalent grounding resistance values of two piers in the local model and a pile foundation arranged in the ground below the piers on the basis of the voltage distribution and the current distribution;
and constructing an equivalent circuit of the second local model according to the equivalent direct current resistance value and each equivalent grounding resistance value.
Preferably, the constructing a dc path model of the high-speed rail bridge section according to the equivalent circuit includes:
sequentially connecting a plurality of second local models until the total length of all the second local models is the same as that of the high-speed railway bridge section, and recording the number of the models of the second local models;
and connecting the equivalent circuits based on the number of the models to obtain a direct current path model of the high-speed rail bridge section.
In a second aspect, an embodiment of the present invention provides a high-speed rail bridge section simulation detection apparatus based on a direct current path model, where the apparatus includes:
the optimization module is used for constructing a first local model of the high-speed rail bridge section based on actual steel bar distribution in the bridge, and optimizing the first local model through a sectional area method to obtain a second local model;
the calculation module is used for calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model and constructing an equivalent circuit of the second local model;
and the construction module is used for constructing a direct current path model of the high-speed rail bridge section according to the equivalent circuit and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method as provided by the first aspect or any one of the possible implementation manners of the first aspect.
The invention has the beneficial effects that: 1. compared with the modeling idea that the steel rail and the through ground wire are generally adopted as the model at present, the constructed model is more precise and accurate, the simulation result is richer, the direct current distribution condition of each part of the railway system can be obtained, and a powerful tool is provided for the whole internal voltage and current distribution of the high-speed rail bridge grounding system.
2. The method is characterized in that a local model is constructed based on the spatial distribution of the reinforcing steel bars in the bridge, and a sectional modeling and direct current equivalent mode is adopted, so that the modeling workload and the time spent on modeling are greatly reduced while the modeling precision is kept.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a high-speed rail bridge section simulation detection method based on a direct-current path model according to an embodiment of the present application;
fig. 2 is an exemplary schematic view of an actual bridge structure provided in the embodiment of the present application;
fig. 3 is an exemplary schematic diagram of a second partial model of a high-speed rail bridge section according to an embodiment of the present application;
fig. 4 is an exemplary schematic diagram of a dc resistance calculation principle of a second local model provided in an embodiment of the present application;
fig. 5 is an exemplary schematic diagram of a ground resistance calculation principle of a second local model according to an embodiment of the present application;
fig. 6 is a schematic diagram illustrating an example of an equivalent circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a high-speed rail bridge section simulation detection device based on a direct-current path model according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the following description, the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance. The following description provides embodiments of the invention, which may be combined with or substituted for various embodiments, and the invention is thus to be construed as embracing all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the invention should also be construed to include embodiments that include one or more of all other possible combinations of A, B, C, D, even though such embodiments may not be explicitly recited in the text below.
The following description provides examples, and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than the order described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
Referring to fig. 1, fig. 1 is a schematic flow chart of a high-speed railway bridge section simulation detection method based on a direct current path model according to an embodiment of the present application. In an embodiment of the present application, the method includes:
s101, constructing a first local model of a high-speed rail bridge section based on actual steel bar distribution in the bridge, and optimizing the first local model through a sectional area method to obtain a second local model.
In the embodiment of the application, the number of reinforcing steel bars at each position in the bridge is large, the reinforcing steel bars are complex, and in order to ensure the accuracy of the model construction, a first local model of the bridge section is constructed according to the actual reinforcing steel bar distribution in the bridge. And optimizing the first local model by a sectional area method, equivalently combining the steel bars which can be integrated to obtain a second local model, thereby reducing the time consumed for calculating each parameter of the model while ensuring the detection accuracy.
In an embodiment, the optimizing the first local model by a cross-sectional area method to obtain a second local model includes:
acquiring the spatial distribution of the reinforcing steel bars of the bridge part above the ground in the first partial model;
and equating a plurality of adjacent steel bars with the same extension direction in the spatial distribution of the steel bars into one steel bar with the same total sectional area to obtain a second local model.
In the embodiment of the present application, as shown in fig. 2, for a bridge structure, the bridge structure includes bridge piers erected on the ground through a cap, a girder longitudinally arranged between the bridge piers, and a pile foundation arranged below the ground where the bridge piers are located. The bridge pier, the beam body and the pile foundation all contain more steel bars, the structure is more complex, and the simulation calculation of the first local model is not facilitated. In addition, because the foundation pile is directly contacted with the ground, the space distribution of the reinforcing steel bars in the foundation pile has large influence on the direct current ground resistance, so that the reinforcing steel bars of the structural part on the ground of the bridge are optimized by a sectional area method, and the first local model is optimized by a mode of completely restoring the reinforcing steel bar structure in the foundation pile. Specifically, a second partial model is shown in fig. 3, which is obtained by performing equivalent calculation on a plurality of adjacent reinforcing bars having the same extending direction by using a cross-sectional area method, that is, performing equivalent calculation on reinforcing bars in each beam and each pier, and equalizing the plurality of reinforcing bars into one reinforcing bar having the same total cross-sectional area. Illustratively, the model part of the pile foundation may be a cement pile of 0.065m thickness wrapped with 20 Φ 16 steel bars, with the cement layer (cladding) considered as a conductor of extremely low resistivity.
S102, calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model, and constructing an equivalent circuit of the second local model.
In the embodiment of the present application, after the second local model is obtained, the equivalent dc resistance value and the equivalent ground resistance value of the second local model can be calculated, so as to construct the equivalent circuit of the second local model.
In an embodiment, the calculating an equivalent dc resistance value and an equivalent ground resistance value of the second local model to construct an equivalent circuit of the second local model includes:
injecting unit current into the second local model to obtain voltage distribution and current distribution on the second local model;
calculating an equivalent direct current resistance value of a beam body arranged between two piers in the local model based on the voltage distribution and the current distribution;
respectively calculating equivalent grounding resistance values of two piers in the local model and a pile foundation arranged in the ground below the piers on the basis of the voltage distribution and the current distribution;
and constructing an equivalent circuit of the second local model according to the equivalent direct current resistance value and each equivalent grounding resistance value.
In the embodiment of the present application, in order to equivalently calculate the dc resistance value and the ground resistance value at each position of the second local model, the unit current Ia is first injected into one end of the second local model, and the unit current Ia is extracted from the other end of the second local model, so that the voltage distribution and the current distribution on the second local model are calculated by means of electromagnetic field simulation. As shown in fig. 4, based on the voltage distribution and the current distribution, the potential difference (Ua-Ub) between the points a and b and the flowing current I are divided to obtain the equivalent resistance of the bridge segment with the length L from the point a to the point b, and the solution of the equivalent direct current resistance RAB on the ground is completed. Then, as shown in fig. 5, the average potential value U at the midpoint between the pier portion and the pile foundation portion and the leakage current value Iz of the pier portion and the pile foundation portion are divided to obtain the equivalent grounding resistance value of the bridge in the vertical grounding direction, so as to complete the solution of the direct current equivalent resistances RA1, RB1, RA2 and RB 2. Based on the calculated data, an equivalent circuit of the second local model can be constructed, as shown in fig. 6.
S103, constructing a direct current path model of the high-speed rail bridge section according to the equivalent circuit, and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model.
In the embodiment of the application, since the second local model is only a model constructed for a small section of the high-speed rail bridge section, in order to obtain a direct-current path model of the whole high-speed rail bridge section, the construction of the direct-current path model is realized according to the obtained equivalent circuit, and the whole high-speed rail bridge section is subjected to simulation detection through the constructed direct-current path model.
In one embodiment, the constructing the dc path model of the high-speed rail bridge section according to the equivalent circuit includes:
sequentially connecting a plurality of second local models until the total length of all the second local models is the same as that of the high-speed railway bridge section, and recording the number of the models of the second local models;
and connecting the equivalent circuits based on the number of the models to obtain a direct current path model of the high-speed rail bridge section.
In the embodiment of the present application, since there is no difference in structural composition between the sections of the high-speed railway bridge section, the obtained second partial models can be identical to the whole model of the high-speed railway bridge section by connecting the plurality of second partial models to the same total length as the high-speed railway bridge section in sequence. And connecting equivalent models according to the same model number to construct a direct current path model.
Possibly, since the second local models are constructed unit length models, if the total length of an integral number of the second local models cannot be equal to the total length of the high-speed railway bridge section, the last second local model at the end can be deleted, and the length of the beam body is determined based on the difference between the total length of all the second local models and the total length of the high-speed railway bridge section at the moment to construct the third local model. And calculating a corrected equivalent circuit of the third partial model, and constructing the direct current path model of the high-speed rail bridge section by taking the third partial model as the last connected partial model at the tail end.
The high-speed rail bridge section simulation detection device based on the direct-current path model according to the embodiment of the invention will be described in detail with reference to fig. 7. It should be noted that, the high-speed railway bridge section simulation detection apparatus based on the dc path model shown in fig. 7 is used for executing the method of the embodiment of the present invention shown in fig. 1, for convenience of description, only the portion related to the embodiment of the present invention is shown, and details of the technology are not disclosed, please refer to the embodiment of the present invention shown in fig. 1.
Referring to fig. 7, fig. 7 is a simulation detection device for a high-speed rail bridge section based on a dc path model according to an embodiment of the present invention. As shown in fig. 7, the apparatus includes:
the optimization module 701 is used for constructing a first local model of a high-speed rail bridge section based on actual steel bar distribution in a bridge, and optimizing the first local model through a sectional area method to obtain a second local model;
a calculating module 702, configured to calculate an equivalent dc resistance value and an equivalent ground resistance value of the second local model, and construct an equivalent circuit of the second local model;
the building module 703 is configured to build a direct current path model of the high-speed rail bridge section according to the equivalent circuit, and perform simulation detection on the entire high-speed rail bridge section based on the direct current path model.
In one possible implementation, the optimization module 701 includes:
the acquisition unit is used for acquiring the spatial distribution of the reinforcing steel bars of the bridge part above the ground in the first partial model;
and the equivalent unit is used for equivalent a plurality of adjacent steel bars with the same extension direction in the spatial distribution of the steel bars into one steel bar with the same total sectional area to obtain a second local model.
In one possible implementation, the calculation module 702 includes:
the injection unit is used for injecting unit current into the second local model to obtain voltage distribution and current distribution on the second local model;
the direct current resistance calculation unit is used for calculating an equivalent direct current resistance value of a beam body arranged between two piers in the local model based on the voltage distribution and the current distribution;
the grounding resistance calculation unit is used for calculating equivalent grounding resistance values of two piers in the local model and a pile foundation arranged in the ground below the piers respectively based on the voltage distribution and the current distribution;
and the equivalent circuit constructing unit is used for constructing an equivalent circuit of the second local model according to the equivalent direct current resistance value and each equivalent grounding resistance value.
In one possible implementation, the building module 703 includes:
the recording unit is used for sequentially connecting the plurality of second local models until the total length of all the second local models is the same as that of the high-speed rail bridge section, and recording the number of the second local models;
and the direct current path model building unit is used for connecting the equivalent circuits based on the number of the models to obtain a direct current path model of the high-speed rail bridge section.
It is clear to a person skilled in the art that the solution according to the embodiments of the invention can be implemented by means of software and/or hardware. The term "unit" and "module" in this specification refers to software and/or hardware capable of performing a specific function independently or in cooperation with other components, wherein the hardware may be, for example, a Field-Programmable Gate Array (FPGA), an Integrated Circuit (IC), or the like.
Each processing unit and/or module according to the embodiments of the present invention may be implemented by an analog circuit that implements the functions described in the embodiments of the present invention, or may be implemented by software that executes the functions described in the embodiments of the present invention.
Referring to fig. 8, a schematic structural diagram of an electronic device according to an embodiment of the present invention is shown, where the electronic device may be used to implement the method in the embodiment shown in fig. 1. As shown in fig. 8, the electronic device 800 may include: at least one central processor 801, at least one network interface 804, a user interface 803, a memory 805, at least one communication bus 802.
The communication bus 802 is used to realize connection communication among these components.
The user interface 803 may include a Display (Display) and a Camera (Camera), and the optional user interface 803 may further include a standard wired interface and a wireless interface.
The network interface 804 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface).
The central processor 801 may include one or more processing cores, among others. The central processor 801 connects various parts within the entire terminal 800 using various interfaces and lines, and performs various functions of the terminal 800 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 805 and calling data stored in the memory 805. Alternatively, the central Processing unit 801 may be implemented in at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The CPU 801 may integrate one or a combination of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It is to be understood that the modem may be implemented by a single chip without being integrated into the central processing unit 801.
The Memory 805 may include a Random Access Memory (RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 805 includes a non-transitory computer-readable medium. The memory 805 may be used to store instructions, programs, code sets, or instruction sets. The memory 805 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the various method embodiments described above, and the like; the storage data area may store data and the like referred to in the above respective method embodiments. The memory 805 may optionally be at least one memory device located remotely from the central processor 801 as previously described. As shown in fig. 8, the memory 805, which is a type of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and program instructions.
In the electronic device 800 shown in fig. 8, the user interface 803 is mainly used as an interface for providing input for a user, and acquiring data input by the user; and the processor 801 may be configured to invoke the dc path model-based high-speed rail bridge section simulation detection application program stored in the memory 805, and specifically perform the following operations:
constructing a first local model of a high-speed rail bridge section based on actual steel bar distribution in the bridge, and optimizing the first local model by a sectional area method to obtain a second local model;
calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model, and constructing an equivalent circuit of the second local model;
and constructing a direct current path model of the high-speed rail bridge section according to the equivalent circuit, and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method. The computer-readable storage medium may include, but is not limited to, any type of disk including floppy disks, optical disks, DVDs, CD-ROMs, microdrive, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic or optical cards, nanosystems (including molecular memory ICs), or any type of media or device suitable for storing instructions and/or data.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some service interfaces, devices or units, and may be an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned memory comprises: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program, which is stored in a computer-readable memory, and the memory may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The above description is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure should not be limited thereby. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure are intended to be included within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. The invention is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (2)
1. A high-speed rail bridge section simulation detection method based on a direct-current path model is characterized by comprising the following steps:
constructing a first local model of a high-speed rail bridge section based on actual steel bar distribution in the bridge, and optimizing the first local model by a sectional area method to obtain a second local model;
calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model, and constructing an equivalent circuit of the second local model;
constructing a direct current path model of the high-speed rail bridge section according to the equivalent circuit, and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model; optimizing the first local model by a cross-sectional area method to obtain a second local model, comprising:
acquiring the spatial distribution of the reinforcing steel bars of the bridge part above the ground in the first partial model;
a plurality of adjacent steel bars with the same extension direction in the spatial distribution of the steel bars are equivalent to one steel bar with the same total sectional area, and a second local model is obtained;
the calculating an equivalent direct current resistance value and an equivalent ground resistance value of the second local model to construct an equivalent circuit of the second local model includes:
injecting unit current into the second local model to obtain voltage distribution and current distribution on the second local model;
calculating an equivalent direct current resistance value of a beam body arranged between two piers in the local model based on the voltage distribution and the current distribution;
respectively calculating equivalent grounding resistance values of two piers in the local model and a pile foundation arranged in the ground below the piers on the basis of the voltage distribution and the current distribution;
constructing an equivalent circuit of the second local model according to the equivalent direct current resistance value and each equivalent grounding resistance value;
the constructing of the direct current path model of the high-speed rail bridge section according to the equivalent circuit comprises:
sequentially connecting a plurality of second local models until the total length of all the second local models is the same as that of the high-speed railway bridge section, and recording the number of the models of the second local models;
connecting the equivalent circuits based on the number of the models to obtain a direct current path model of the high-speed rail bridge section;
if the total length of the integral second local models is different from the total length of the high-speed rail bridge section, deleting the last second local model at the tail end of the high-speed rail bridge section, acquiring the difference between the total length of all the second local models and the total length of the high-speed rail bridge section, and constructing a third local model;
and calculating an equivalent circuit of the third local model, and taking the third local model as the last connected local model at the tail end of the high-speed rail bridge section to complete the construction of the direct-current path model of the high-speed rail bridge section.
2. A high-speed railway bridge section simulation detection device based on direct current path model, its characterized in that, the device includes:
the optimization module is used for constructing a first local model of the high-speed rail bridge section based on actual steel bar distribution in the bridge, and optimizing the first local model through a sectional area method to obtain a second local model;
the calculation module is used for calculating an equivalent direct current resistance value and an equivalent grounding resistance value of the second local model and constructing an equivalent circuit of the second local model;
the building module is used for building a direct current path model of the high-speed rail bridge section according to the equivalent circuit and carrying out simulation detection on the whole high-speed rail bridge section based on the direct current path model;
optimizing the first local model by a cross-sectional area method to obtain a second local model, comprising:
acquiring the spatial distribution of the reinforcing steel bars of the bridge part above the ground in the first partial model;
a plurality of adjacent steel bars with the same extension direction in the spatial distribution of the steel bars are equivalent to one steel bar with the same total sectional area, and a second local model is obtained;
the calculating an equivalent direct current resistance value and an equivalent ground resistance value of the second local model to construct an equivalent circuit of the second local model includes:
injecting unit current into the second local model to obtain voltage distribution and current distribution on the second local model;
calculating an equivalent direct current resistance value of a beam body arranged between two piers in the local model based on the voltage distribution and the current distribution;
respectively calculating equivalent grounding resistance values of two piers in the local model and a pile foundation arranged in the ground below the piers on the basis of the voltage distribution and the current distribution;
constructing an equivalent circuit of the second local model according to the equivalent direct current resistance value and each equivalent grounding resistance value;
the constructing of the direct current path model of the high-speed rail bridge section according to the equivalent circuit comprises:
sequentially connecting a plurality of second local models until the total length of all the second local models is the same as that of the high-speed railway bridge section, and recording the number of the models of the second local models;
connecting the equivalent circuits based on the number of the models to obtain a direct current path model of the high-speed rail bridge section;
if the total length of the integral second local models is different from the total length of the high-speed rail bridge section, deleting the last second local model at the tail end of the high-speed rail bridge section, acquiring the difference between the total length of all the second local models and the total length of the high-speed rail bridge section, and constructing a third local model;
and calculating an equivalent circuit of the third local model, and taking the third local model as the last connected local model at the tail end of the high-speed rail bridge section to complete the construction of the direct-current path model of the high-speed rail bridge section.
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