CN114595610B - Method for creating tunnel finite element model based on Revit secondary development and Ansys command stream - Google Patents
Method for creating tunnel finite element model based on Revit secondary development and Ansys command stream Download PDFInfo
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Abstract
The invention provides a method for creating a tunnel finite element model based on Revit secondary development and combining with an Ansys command stream, which is divided into a two-dimensional conversion method and a three-dimensional conversion method, wherein the two-dimensional method establishes a three-centered circle through a circle center and a radius so as to establish a two-dimensional model, and the three-dimensional method realizes that the tunnel model established in Revit is completely imported into Ansys software by dividing the entity model into a plurality of equidistant small segments and then converting the equidistant small segments. The method solves the problem that the current tunnel BIM model can only be imported into the finite element software, lays a foundation for the subsequent digital integration of underground engineering, and greatly provides the efficiency of underground engineering design, construction, operation, maintenance and the like.
Description
Technical Field
The invention relates to the technical field of building information and building design, in particular to a method for creating a finite element model of a tunnel based on Revit secondary development and Ansys command stream.
Background
Along with the rapid development of BIM technology, more and more engineering projects require the engineering projects to have the characteristics of visualization, 3D simulation and the like, and the information technology is applied to the whole period of construction engineering. Compared with the common engineering, the geological condition of the tunnel engineering is more complex, the unknown factors are more, and the resource allocation in the construction is more important, so that the advantages of the BIM technology in the tunnel industry are greater than those in the building industry. However, due to the limitation of software and environment, the informatization level of the tunnel engineering in China is very low, and the application of BIM still remains in the design stage.
In tunnel design, numerical simulation analysis of tunnels is an important stage of an project, and computational analysis must be performed by finite element software to prove that the tunnels meet the criteria of limit states. According to geological and rock conditions, tunnel excavation and supporting methods, the tunnel is subjected to two-dimensional or three-dimensional analysis under different loads, and the possible occurrence of the tunnel in the using or construction process is predicted. In the course of finite element analysis, two different models must be created: a tunnel information model including three-dimensional geometric data of the tunnel, and a calculation model including structural geometry, load information, material characteristics, and the like. Since they are independent models, each modification will make adjustments to both models, which doubles the effort and reduces efficiency.
However, in order for the BIM model to be successfully applied to the finite element analysis software, an interface between the two must be written, or the model and the finite element calculation function are put on the same platform, so as to solve the incompatibility problem between the two. Among them, writing interfaces is an important way for most students to solve the conversion problem, and successful solution of the conversion interface problem depends on parameters of components, constraints, and efficient conversion of format data, which have decisive influence on design and construction.
As mainstream modeling software Revit in BIM software, the interface of the modeling software Revit and finite element analysis software is mostly applied to the field of building structure analysis, and in practical application of BIM tunnel engineering, the modeling software Revit is mostly imported into finite element software by using standard data formats of DXF, SAT and ACIS, because Revit provides output of the model Revit, the file formats of SAT and ACIS and ANSYS and ABAQUS also have the function of inputting geometric models through standard formats such as SAT and ACIS, etc., but the models imported into the model are only one integral closed geometric body, and the model cannot be directly meshed when the model is imported into the finite element software for analysis. Meanwhile, models imported through ACIS, SAT and the like have no material parameters, manual assignment is needed, the workload of model segmentation and material assignment is still large, the modeling time is greatly increased, the condition that geometric data are lost and converted data are not thorough easily occurs in the conversion mode, and great trouble is caused to the application of the BIM tunnel model in the aspect of finite elements.
The tunnel model is different from a building model, the model is formed by stretching irregular shapes, the existing traversing angular point coordinates are used for sorting, and the recombination among cuboids is carried out according to the angular point coordinates.
Therefore, in view of the above-mentioned problem of finite element model conversion of the tunnel, a method for parameterizing modeling and converting the finite element model is provided, the modeling is completed, and meanwhile, a tunnel information model and a calculation model are derived, so that preparation is made in advance when the finite element analysis is performed on the tunnel, and the workload is reduced. Therefore, engineering modeling and calculation are integrated, and full life cycle information data sharing of tunnel engineering is achieved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for creating a finite element model of a tunnel based on Revit secondary development and Ansys command stream, which is divided into a two-dimensional conversion method and a three-dimensional conversion method, wherein the two-dimensional method establishes a three-centered circle through a circle center and a radius so as to establish a two-dimensional model, and the three-dimensional method divides the entity model into a plurality of equidistant small segments and converts the equidistant small segments, so that the tunnel model established in Revit is completely imported into Ansys software, and the method is applicable to mountain tunnels with all three-centered circle outlines and has general practicability.
In order to achieve the above object, the present invention adopts the following technical scheme:
a method for creating a tunnel finite element model based on Revit secondary development and combining Ansys command streams converts a tunnel model modeled by parameterization into a two-dimensional or three-dimensional finite element model. The method comprises the following steps:
s1: establishing a tunnel model by inputting the center and the radius of the key points, and simultaneously establishing tunnel geometric parameters;
s2: establishing model data by inputting structural parameters, wherein the structural parameters comprise: stratum geometry parameters, stratum structure parameters, tunnel structure parameters;
s3: if a two-dimensional finite element model needs to be generated: obtaining tunnel geometric parameters, namely the center coordinates and the radius of a key point Circle, and outputting a K command for generating the key point and a Circle command for generating the outline according to the APDL command stream requirement of Ansys software;
s4: if a three-dimensional finite element model needs to be generated: obtaining all model lines through traversing, breaking the model lines into equidistant multi-section lines, traversing each multi-section line successively, generating corresponding points and lines, and outputting a key point K command and an L command for generating the lines;
s5: acquiring stratum geometric parameters, namely stratum range, burial depth and stratum thickness, and outputting a K command for generating key points, an L command for generating lines and an AL command for generating lines according to APDL command flow requirements of Ansys software;
s6: the stratum structure parameters and tunnel structure parameters, namely the elastic modulus, poisson's ratio and density of soil and support, are obtained, and according to APDL command stream requirements of Ansys software, MP command streams for generating material properties are output;
s7: the generated command stream is read by Ansys software, and a three-dimensional finite element model is automatically generated.
Further, in the step S1, the specific steps of creating the tunnel model are as follows:
establishing a relation between parameters required by the tunnel three-center circular outline, determining basic parameters for generating the three-center circular outline, and storing the parameters, so that a three-dimensional finite element model can be generated conveniently; a model generation interface is developed in a Revit top toolbar, and a tunnel three-center circle outline model is generated according to parameters.
Further, the specific steps of the step S2 are as follows:
s21: selecting a tunnel family to be input with parameters in Revit;
s22: operating plug-in of input parameters;
s23: parameters are input in the panel, and the corresponding parameters can be checked in the Revit family attribute by clicking "generate".
Further, the specific steps of the step S3 are as follows:
s31: filtering tunnel families in the project into different sets;
s32: traversing the set to obtain the geometric information of the tunnel;
s33: for geometric information of a tunnel, four points and radiuses of the contour are firstly obtained, and 4 circles of the contour of the tunnel are generated by using a K key point command and a Circle generating Circle command in Ansys;
s34: the tunnel profile is generated with the "Lcsl" disconnect command and the "Lsel" select command in Ansys.
Further, the specific steps of the step S4 are as follows:
s41: filtering tunnel families in the project into different sets;
s42: traversing the set to obtain the model line of the contour of the tunnel, and breaking the model line
S43: and traversing the broken model line, acquiring corresponding points and lines, and generating a corresponding K command and an L command in Ansys.
Further, steps S5 and S6 are the same as steps S3 and S4, respectively, and generate a corresponding Ansys command stream after traversing the relevant information.
Further, the specific step of the step S7 is to import the generated TXT file into Ansys software to complete the creation and grid division of the tunnel three-dimensional model.
Compared with the prior art, the invention has the advantages that:
application programming interfaces (API interfaces) provided for users by Revit software are utilized to realize application of BIM model information, firstly, the API interfaces are utilized to realize parametric modeling of a tunnel model, and through analysis and research on finite element models of highway tunnels, geometric, structural and surrounding rock data required by building the tunnel finite element models are summarized, a data structure of the tunnel finite element models is built, a method for converting the Revit tunnel models into three-dimensional finite element models is built, and storage of the tunnel finite element model data structures is completed while the modeling of the tunnel models is completed. On the basis, the APDL language of Ansys is combined to realize the conversion of the finite element model, the pretreatment work of the finite element model is basically completed, the numerical modeling flow of the highway tunnel is simplified, and the finite element calculation analysis time is effectively saved. The method uses the method of converting the building model into the finite element model, solves the problem that the current tunnel BIM model can only introduce two-dimensional geometric information into finite element software, lays a foundation for the subsequent implementation of digital integration of underground engineering, and greatly provides the efficiency of underground engineering design, construction, operation, maintenance and the like.
Drawings
FIG. 1 is a diagram of an operational interface for creating a tunnel model in an example of the invention;
FIG. 2 is a diagram of a parameterized tunnel model in an example of the invention;
FIG. 3 is a data structure and data entry interface of a tunnel model in an example of the invention;
FIG. 4 is a tunnel multi-segment line model in an example of the invention
Fig. 5 is a TXT text in APDL command stream format generated in an example of the present invention
FIG. 6 is a two-dimensional tunnel finite element model generated in an example of the invention;
fig. 7 is a three-dimensional tunnel finite element model generated in an example of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following examples are given for further details, and include the following steps:
s1: and collecting and arranging related data, wherein the related data mainly comprise parameters required for establishing a tunnel, engineering geological parameters of stratum and related structural parameters of a supporting structure.
S2: and creating a tunnel BIM model according to the related data, and building related structure data.
As shown in fig. 1, according to the design specification of the highway tunnel, tunnel structure parameters mainly including coordinates, central angles and radiuses of each arc are determined, a parameterized 2D contour is established by inputting the structure parameters of the inner contour of the tunnel, and a complex three-dimensional model is created by geometrical construction methods such as lofting, stretching of the 2D contour and the like. The patent uses the inner and outer contours of the three-center circle as an example, input parameters are an arch arc radius R1, an inverted arch arc radius R2, a connecting arc radius R3, an arch included angle a1, an inverted arch included angle a2, an arch center ordinate H1 and an inverted arch center ordinate H2, a tunnel contour model is created through a link path file, and the created tunnel contour model is shown in a figure II. The parameterization creation includes the following steps:
(1) And linking the Excel file to create a path line. The basic idea of creating the path line is to acquire data in an Excel table by using a data table, create XYZ coordinates according to the data on the number of rows and columns in the table multiplied by coefficients, then generate relevant lines by the coordinate data, and finally collect all the lines into a cO set of CurveArray class to generate the path line.
(2) Relevant data is input, and a parameterized tunnel profile model is created. The basic idea of creating the model is that firstly, a collector is created to collect all data in items, and all the examples in the collector are traversed, a Name method is used for finding a family with the same Name as the examples, and a LookupParameter.set method is used for creating and modifying the attribute of the family examples, so that a parameterized tunnel contour model establishment method is achieved. The creation model is shown in fig. 2.
(3) And inputting related parameters through the interface panel number to establish structural data. The basic idea is that firstly, an element model is selected, related data is input into the model by using a LookupParameter. Set method, and the data can be traversed and found, so that preparation is made for creating a limited original model, and the main requirement is that the data structure is of String type when input. The created data structure is shown in fig. 3.
S3: and reading the related information of the BIM model, and inputting the related information into the value Ansys software in the form of APDL command stream. The method comprises the following specific steps:
(1) First, a two-dimensional finite model is built. The idea of creating a two-dimensional finite element model is: and reading data of key points, generating a Circle by using a Circle command, disconnecting an intersecting line by using an Lsel command, generating a new line, and ensuring that the outer contour is the same, wherein the model size of the surrounding rock part is the same as the requirement of the Saint Vietnam principle, namely the tunnel span with the boundary distance between the tunnel and the surrounding rock being more than 3-5 times, and the inner contour line of the tunnel is coincident with the symmetry axis of the surrounding rock body. . The specific method is that firstly, elements required by filter filtration are created, then geometric information is obtained, after key points and radiuses are read, the diameters are arranged in a descending order to obtain the reading order, so that the sequence numbers of the generated points are not disordered, and the subsequent shearing operation is orderly carried out. The codes for obtaining the geometric information are shown as follows, wherein the codes comprise 3 methods of creating key points, creating circular arcs and cutting. And outputting the geometric information in an APDL command form after acquiring the geometric information, and completing the creation of the finite element model.
(2) Then a three-dimensional finite element model is created. The method has the core thought that the contour model line is broken to generate a multi-section line, the multi-section line model is shown in figure 4, the dotted line data of the multi-section line are read, and the plane is generated by the dotted line data, so that the three-dimensional finite element model is built. The method for sequencing numbers and reading the dot-line-surface data is similar to the method for generating the two-dimensional finite element model, and specific codes are as follows:
(3) And (5) material giving. The material is endowed with the acquisition element through the filter, the Extrusion in the filter is traversed, the material attribute is acquired by using the family manager. Get_parameter method, and the material attribute is endowed with a character string, so that the subsequent conversion is facilitated.
(4) Converted to APDL command stream format. All the geometric information and material information are collected in the previous step, the information and command streams are now corresponding, for example, point information corresponds to a "K" command, line information corresponds to an "L" command, a Circle drawing corresponds to a "Circle" command, an "MP" command for generating material properties and the like, the information is traversed, the information is converted into a corresponding character string format, the corresponding character string format is output into TXT text, and the TXT text is imported into Ansys to generate a finite element model. The generated TXT text is shown in fig. 5, the generated two-dimensional tunnel finite element model is shown in fig. 6, and the generated three-dimensional tunnel finite element model is shown in fig. 7.
It will be appreciated by persons skilled in the art that the examples described herein are intended to aid the reader in understanding the methods used in this invention, and that the scope of the invention is not limited to such specific statements and examples. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (7)
1. The method for creating the tunnel finite element model by combining the Ansys command stream based on the Revit secondary development is characterized by converting the tunnel model modeled by parameterization into a two-dimensional or three-dimensional finite element model, and specifically comprises the following steps of:
s1: establishing a tunnel model by inputting the center and the radius of the key points, and simultaneously establishing tunnel geometric parameters;
s2: establishing model data by inputting structural parameters, wherein the structural parameters comprise: stratum geometry parameters, stratum structure parameters, tunnel structure parameters;
s3: if a two-dimensional finite element model needs to be generated: obtaining tunnel geometric parameters, namely the center coordinates and the radius of a key point Circle, and outputting a K command for generating the key point and a Circle command for generating the outline according to the APDL command stream requirement of Ansys software;
s4: if a three-dimensional finite element model needs to be generated: obtaining all model lines through traversing, breaking the model lines into equidistant multi-section lines, traversing each multi-section line successively, generating corresponding points and lines, and outputting a key point K command and an L command for generating the lines;
s5: acquiring stratum geometric parameters, namely stratum range, burial depth and stratum thickness, and outputting a K command for generating key points, an L command for generating lines and an AL command for generating lines according to APDL command flow requirements of Ansys software;
s6: the stratum structure parameters and tunnel structure parameters, namely the elastic modulus, poisson's ratio and density of soil and support, are obtained, and according to APDL command stream requirements of Ansys software, MP command streams for generating material properties are output;
s7: the generated command stream is read by Ansys software, and a three-dimensional finite element model is automatically generated.
2. The method for creating the tunnel finite element model based on the Revit secondary development and the Ansys command stream according to claim 1, wherein in the step S1, the specific steps for creating the tunnel model are as follows:
establishing a relation between parameters required by the tunnel three-center circular outline, determining basic parameters for generating the three-center circular outline, and storing the parameters, so that a three-dimensional finite element model can be generated conveniently; a model generation interface is developed in a Revit top toolbar, and a tunnel three-center circle outline model is generated according to parameters.
3. The method for creating a finite element model of a tunnel based on the Revit secondary development in combination with the Ansys command stream according to claim 1, wherein the specific steps of the step S2 are as follows:
s21: selecting a tunnel family to be input with parameters in Revit;
s22: operating plug-in of input parameters;
s23: parameters are input in the panel, and the corresponding parameters can be checked in the Revit family attribute by clicking "generate".
4. The method for creating a finite element model of a tunnel based on the Revit secondary development in combination with the Ansys command stream according to claim 1, wherein the specific steps of the step S3 are as follows:
s31: filtering tunnel families in the project into different sets;
s32: traversing the set to obtain the geometric information of the tunnel;
s33: for geometric information of a tunnel, four points and radiuses of the contour are firstly obtained, and 4 circles of the contour of the tunnel are generated by using a K key point command and a Circle generating Circle command in Ansys;
s34: the tunnel profile is generated with the "Lcsl" disconnect command and the "Lsel" select command in Ansys.
5. The method for creating a finite element model of a tunnel based on the Revit secondary development in combination with the Ansys command stream according to claim 1, wherein the specific steps of the step S4 are as follows:
s41: filtering tunnel families in the project into different sets;
s42: traversing the set to obtain the model line of the contour of the tunnel, and breaking the model line
S43: and traversing the broken model line, acquiring corresponding points and lines, and generating a corresponding K command and an L command in Ansys.
6. The method for creating a tunnel finite element model based on the Revit secondary development and the Ansys command stream according to claim 1, wherein the steps S5 and S6 are the same as the steps S3 and S4, respectively, and generate the corresponding Ansys command stream after traversing the relevant information.
7. The method for creating the tunnel finite element model based on the Revit secondary development and the Ansys command stream according to claim 1 is characterized in that the specific step of the step S7 is to import the generated TXT file into the Ansys software, namely, the creation and the meshing of the tunnel three-dimensional model are completed.
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| CN109800536A (en) * | 2019-02-17 | 2019-05-24 | 四川汶马高速公路有限责任公司 | One kind parameterizing tunnel model fast modeling method based on Revit and Dynamo |
| CN110175356A (en) * | 2019-04-22 | 2019-08-27 | 中冶南方工程技术有限公司 | A kind of rapid Modeling and Design method of beam bridge based on Revit secondary development |
| CN111796866A (en) * | 2020-07-08 | 2020-10-20 | 成都理工大学 | Method for acquiring frame structure information based on Revit secondary development combined with Ansys command stream |
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| CN109800536A (en) * | 2019-02-17 | 2019-05-24 | 四川汶马高速公路有限责任公司 | One kind parameterizing tunnel model fast modeling method based on Revit and Dynamo |
| CN110175356A (en) * | 2019-04-22 | 2019-08-27 | 中冶南方工程技术有限公司 | A kind of rapid Modeling and Design method of beam bridge based on Revit secondary development |
| CN111796866A (en) * | 2020-07-08 | 2020-10-20 | 成都理工大学 | Method for acquiring frame structure information based on Revit secondary development combined with Ansys command stream |
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