CN111562905A - Safety evaluation method for truss type crossing pipeline with uneven settlement foundation - Google Patents
Safety evaluation method for truss type crossing pipeline with uneven settlement foundation Download PDFInfo
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- CN111562905A CN111562905A CN202010282792.1A CN202010282792A CN111562905A CN 111562905 A CN111562905 A CN 111562905A CN 202010282792 A CN202010282792 A CN 202010282792A CN 111562905 A CN111562905 A CN 111562905A
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Abstract
The invention discloses a safety evaluation method of a foundation differential settlement truss type crossing pipeline, which comprises the following steps: s1, establishing a VB (visual basic) interface, and setting an interface between VB and ANSYS; s2, compiling a parameterized basic command stream program format for establishing a geometric model, applying loads and boundary conditions, solving calculation and analyzing results; s3, inputting calculation parameters of the basic uneven settlement truss type crossing pipeline on a VB human-computer interaction interface; s4, generating a basic uneven settlement truss type APDL complete command stream of the crossing pipeline; s5, importing the APDL complete command stream into ANSYS software to operate, completing finite element calculation of the basic differential settlement truss type crossing pipeline and outputting a result; and S6, extracting a finite element calculation result by using a VB post-processing program to obtain a calculated maximum stress value and displacement value, and comparing the maximum stress value and the displacement value with allowable stress to generate a safety performance analysis report.
Description
Technical Field
The invention relates to the field of finite element analysis of a truss type crossing pipeline for uneven settlement of a foundation, in particular to a safety evaluation method of the truss type crossing pipeline for uneven settlement of the foundation, which is suitable for industries of petroleum, chemical engineering, energy and the like using pipeline transportation.
Background
The pipeline is one of the commonly used transportation equipment, and is widely applied to industries such as petroleum, chemical engineering, energy and the like. The overhead pipelines in the chemical industry park are generally laid on a pipe gallery in a concentrated mode in a plurality of or even more than ten pieces, the transportation distance is long, special sections such as roads and rivers need to be crossed inevitably, and the truss type crossing structure is the most commonly applied mode in pipeline crossing engineering. Because of reasons such as geological soil and design are unscientific, uneven settlement can appear in the piping lane basis for the pipeline load on the piping lane distributes unevenly, thereby produces additional stress, leads to the destruction of pipeline. Most of the overhead pipelines are various chemical and chemical materials, most of the overhead pipelines are inflammable, explosive or toxic media, so that one pipeline has a problem, serious accidents of the whole pipeline corridor can be caused, and the consequences are unreasonable. Therefore, the truss type crossing pipeline with uneven settlement on the foundation seriously influences the safe operation of the pipeline and becomes a potential hazard source in the period.
For stress detection of a foundation uneven settlement truss type crossing pipeline, the methods of most detection institutions and researchers at home and abroad mainly focus on carrying out field measurement by applying a resistance strain measurement principle and carrying out finite element calculation by using simulation software at present. For on-site measurement, a large amount of manpower and material resources are consumed, and it is difficult to perform comprehensive inspection on the whole pipeline. For the calculation by using simulation software, workers need to have a certain foundation for the software, the simulation software is complex to operate and complex in calculation process, and the model is difficult to modify and recalculate in the analysis process and is difficult to master, so that the conventional method for measuring the pipeline stress cannot achieve the aim of economy and easy master.
VB (visual basic) is a general object-based programming language, and an interface written by using the VB can simplify the operation and process and analyze complex data. The APDL (ANNSYS Parametric design Language) has the characteristics of parametrically defining ANSYS software setting and realizing the automation of an ANSYS operation process, and is particularly suitable for a calculation analysis process needing repeated acceptance check. Therefore, the invention can conveniently realize the safety assessment of the foundation uneven settlement truss type crossing pipeline by using VB combined with APDL method.
Disclosure of Invention
The invention aims to provide an analysis method for calculating and evaluating mechanical properties of a basic uneven truss type crossing pipeline by combining VB (visual basic system) with high calculation accuracy and APDL (advanced persistent programming language) with high speed and convenience, aiming at the problems that when ANSYS software is used as a tool for calculating and evaluating mechanical properties of the basic uneven truss type crossing pipeline and evaluating and analyzing safety, the whole calculation and analysis process is very complicated and the calculation efficiency is low in the prior art.
The invention is realized by at least one of the following technical schemes.
The safety evaluation method of the foundation differential settlement truss type crossing pipeline comprises the following steps:
s1, selecting a required label control to edit the attribute in the window through a built-in control in the VB tool box, thereby establishing a VB human-computer interaction interface, calling ANSYS by using a Shell function in the VB and realizing the connection between the ANSYS and the VB;
s2, compiling the steps of establishing a geometric model, applying load and boundary conditions, solving calculation and result analysis in the ANSYS analysis process into an APDL basic command stream program format;
s3, inputting calculation parameters of the basic uneven settlement truss type crossing pipeline on a VB interactive interface;
s4, generating a basic uneven settlement truss type APDL (advanced persistent threat description language) complete command stream through a VB (visual basic) text interface;
s5, driving ANSYS to operate in the background of the computer through VB, and importing the APDL complete command stream into ANSYS software to operate, thereby completing finite element calculation of the basic differential settlement truss type crossing pipeline and outputting a result;
and S6, extracting a finite element calculation result of the foundation differential settlement truss type crossing pipeline by using a VB post-processing program, extracting a calculated maximum stress value and a calculated maximum displacement value through a 'get' command in APDL, returning the maximum stress value and the maximum displacement value to the interface through a VB control, comparing the maximum stress value and the maximum displacement value with the allowable stress, and if the calculated value is less than the allowable stress, determining that the safety is safe, otherwise, determining that the safety is unsafe, and generating a safety analysis report.
Further, the VB interactive interface comprises interaction with a user, calculation parameter input and APDL command stream processing; the calculation parameters comprise geometric model parameters, loads, constraints and section steel types.
Further, step S2 is compiled by the secondary development language APDL.
Furthermore, the calculation parameters input by the VB interactive interface are imported into an APDL basic command stream program format through a text interface of the VB, and the generated APDL complete command stream is stored in a specified directory.
Further, the loads include temperature loads, gravity loads, and pressure loads; the boundary condition is a constraint of the pipeline upright.
Further, in step S5, specifically, the VB calls ANSYS software in the background of the computer by calling the interface program to submit the generated APDL complete command stream file to the ANSYS program for finite element calculation, and the user can execute corresponding calculation by clicking the calculation button again.
Further, the finite element calculation result includes the calculated result data and the cloud map.
Furthermore, in the extraction process of the VB post-processing program, a Shell function in VB is used as a medium, the running program of ANSYS is connected to the function, so that ANSYS is called under a VB interactive interface, the connection between ANSYS and VB is realized, then APDL command streams are read for automatic solution by running the existing developed ANSYS macro program, and the obtained result is displayed in the VB interactive interface through a VB built-in control, so that the data transmission between ANSYS and VB is realized, and the calculation result of ANSYS can be checked under the VB interactive interface.
The invention compiles a plurality of steps of ANSYS analysis process into parameterized command stream through a secondary development language APDL, then programs according to the parameterized command stream code of the model in a VB program, packages and stores the parameterized command stream code in a background, visualizes the process by using a human-computer interaction user interface program of the VB, and a user can call background software for analysis and post-processing through a post-processing program by only inputting calculation parameters on a system interface through a calling interface program and returns a calculation result to the user.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method visualizes a complex ANSYS finite element simulation analysis process, omits a large amount of fussy manual operations in a truss type spanning pipeline mechanical calculation analysis process, and comprises the steps of completing basic environment setting required by ANSYS software calculation at one time by customizing APDL basic command stream formats, replacing preprocessing operations such as establishing models and applying loads in ANSYS by inputting calculation parameters and structural parameters in a VB interface, automatically generating complete APDL command streams, storing in a background, automatically extracting a calculation interface and returning the calculation interface to the VB interface. The method has clear thought, comprehensive process and simple and convenient operation, does not require workers to be skilled in learning finite element simulation calculation principles and ANSYS software operation methods, can complete the tedious work of mechanical property analysis of the truss type crossing pipeline by inputting calculation parameters and design parameters of the truss type crossing pipeline on a VB interface, calling ANSYS by using a Shell function of VB, returning a calculation result to a user, and automatically generating a safety property analysis report of the truss type crossing pipeline according to the comparison of the calculation result and allowable stress. The method is very suitable for people who are not familiar with software, reduces manual operation steps, saves cost and effectively improves the design efficiency of designers.
Drawings
FIG. 1 is a basic flow chart of the safety assessment method for the basic differential settlement truss-type crossing pipeline of the embodiment;
FIG. 2 is a three-dimensional solid view of the truss-type spanning pipe of the present embodiment;
fig. 3 is a flowchart of a safety evaluation method of the basic uneven settlement truss-type crossing pipeline of the embodiment.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
As shown in fig. 1, in the safety evaluation method for a basic uneven settlement truss-type crossing pipeline of this embodiment, a basic command stream program format is customized through an ANSYS secondary development language APDL, basic environment setting for performing finite element calculation analysis of the truss-type crossing pipeline by using ANSYS software is completed at one time, a VB program is programmed to enable the basic environment setting to be capable of performing input of calculation parameters of the truss-type crossing pipeline, conversion of an APDL command stream and extraction and analysis of calculation results, and a simple operation of inputting parameters of the truss-type crossing pipeline in a VB interactive interface is used to replace tedious processing operations of geometric modeling, load application, boundary condition application, calculation solution and result analysis in an ANSYS finite element structural analysis process. When the parameter of the truss type crossing pipeline is input on a VB interface, the VB program parameter is operated to read in an APDL basic command stream program, the VB program guides APDL command streams into ANSYS software, finite element calculation of the truss type crossing pipeline structure is automatically completed, calculation results are automatically extracted and analyzed through the VB program and returned to a user, and a safety performance analysis report of the truss type crossing pipeline is generated according to the analysis results.
As shown in fig. 2, the truss type span the pipeline bridge with a total length of 39 meters, 10 groups of foundation columns, each group of foundation columns being 6 meters wide, 4 layers of pipe racks, 5 pipelines in the 1 st layer of pipe racks, 3 pipelines in the 2 nd layer, 3 pipelines in the 3 rd layer, 16 pipelines in the 4 th layer, and a total of 27 pipelines.
The safety assessment method for the foundation differential settlement truss type crossing pipeline as shown in fig. 3 comprises the following steps:
s1, establishing a VB interactive interface, inputting support and hanger parameters including parameters of a geometric model, structural size, load, constraint, section steel type and the like in a VB program interface, selecting proper section steel and structural characteristic parameters thereof in advance, and calling ANSYS by using a Shell function in the VB to realize the setting of an interface of the VB and the ANSYS; the loads comprise temperature loads, gravity loads and pressure loads; the boundary condition is a constraint of the pipeline upright.
S2, according to ANSYS software setting and operation flow in the truss type spanning pipeline static force finite element calculation analysis process, wherein the software setting comprises the setting of simulation environment, working directory and working name, the operation flow comprises software pre-processing, calculation and post-processing flows, APDL (ANSYS parameterized language) is used for compiling a basic command flow program, and ANSYS analysis steps are completed at one time: establishing a finite element model, applying load to solve and post-process, wherein the establishing of the finite element model comprises defining element types, defining materials, defining real constants and dividing grids, the applying of the load comprises defining analysis types, applying constraint and load and solving, and the post-process comprises reading in results, displaying graph knots, displaying list results and extracting stress cloud pictures and displacement cloud pictures.
And S3, when all parameters in the VB interface are input, clicking a determination button by a user, and automatically generating a truss-type complete APDL command stream crossing the pipeline in a document format by the VB through a text interface and storing the APDL command stream in a specified directory.
And S4, when the user clicks the calculation button, calling ANSYS software by the VB program through the Shell function, and importing the stored complete APDL command stream into the ANSYS software to complete static finite element calculation of the truss type crossing pipeline.
And S5, automatically extracting and analyzing a structural static finite element calculation result of the truss type crossing pipeline by using a VB post-processing program, extracting a calculated maximum stress value and a calculated maximum displacement value through a get command in APDL and returning the maximum stress value and the maximum displacement value to the interface through a VB control.
And S6, comparing the calculated result with the maximum stress value of the industrial pipeline determined by the specification, if the calculated value is smaller than the allowable stress, the calculation is safe, otherwise, the calculation is unsafe, and generating a safety analysis report.
The finite element calculation results comprise a stress cloud picture and a displacement cloud picture. Specifically, VB and ANSYS are connected through a Shell function in VB, automatic solution of ANSYS is achieved, and the obtained result is returned to a VB human-computer interaction interface, so that data transmission between ANSYS and VB is achieved, the calculation result checked under the VB human-computer interaction interface is obtained, a truss type crossing pipeline safety performance analysis report is automatically generated, and the report can provide guidance for actual industrial production.
As shown in fig. 3, the basic command stream program written in advance by the basic method for evaluating the security of an uneven settlement truss-type crossing pipeline in this embodiment completes all basic settings of a computing operation environment, and sequentially sets an analysis module, a unit type, a real constant, a material parameter, a grid division, an analysis type, a view direction, an original data unit table, an original data operation process, and a result output format.
The foregoing descriptions of embodiments of the present invention have been presented for purposes of illustration and description. They do not limit the invention to the details described above and many modifications and variations are possible in light of the above teaching. The examples were chosen and described in order to best explain the principles of the invention and their practical application, to thereby enable others skilled in the art to best utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. It is, therefore, to be understood that the invention is intended to cover all modifications and equivalents within the scope of the following claims.
Claims (8)
1. The safety evaluation method of the foundation differential settlement truss type crossing pipeline is characterized by comprising the following steps:
s1, selecting a required label control to edit the attribute in the window through a built-in control in the VB tool box, thereby establishing a VB human-computer interaction interface, calling ANSYS by using a Shell function in the VB and realizing the connection between the ANSYS and the VB;
s2, compiling the steps of establishing a geometric model, applying load and boundary conditions, solving calculation and result analysis in the ANSYS analysis process into an APDL basic command stream program format;
s3, inputting calculation parameters of the basic uneven settlement truss type crossing pipeline on a VB interactive interface;
s4, generating a basic uneven settlement truss type APDL (advanced persistent threat description language) complete command stream through a VB (visual basic) text interface;
s5, driving ANSYS to operate in the background of the computer through VB, and importing the APDL complete command stream into ANSYS software to operate, thereby completing finite element calculation of the basic differential settlement truss type crossing pipeline and outputting a result;
and S6, extracting a finite element calculation result of the foundation differential settlement truss type crossing pipeline by using a VB post-processing program, extracting a calculated maximum stress value and a calculated maximum displacement value through a 'get' command in APDL, returning the maximum stress value and the maximum displacement value to the interface through a VB control, comparing the maximum stress value and the maximum displacement value with the allowable stress, and if the calculated value is less than the allowable stress, determining that the safety is safe, otherwise, determining that the safety is unsafe, and generating a safety analysis report.
2. The method for assessing the safety of a basic differential settlement truss-type crossing pipeline of claim 1, wherein the VB interactive interface comprises interaction with a user, input of calculation parameters and processing of APDL command streams; the calculation parameters comprise geometric model parameters, loads, constraints and section steel types.
3. The method of claim 1, wherein the step S2 is compiled by the secondary development language APDL.
4. The method of claim 1, wherein the computing parameters inputted from the VB interface are imported into APDL basic command stream program format through the VB text interface, and the generated APDL complete command stream is stored in the designated directory.
5. The method of claim 1, wherein the loads include temperature loads, gravitational loads, and pressure loads; the boundary condition is a constraint of the pipeline upright.
6. The method of claim 1, wherein the VB calls ANSYS software in the background of the computer through the calling interface program to submit the generated APDL complete command stream file to the ANSYS program for finite element calculation, and the user clicks the calculation button again to execute the corresponding calculation.
7. The method of claim 1, wherein the finite element calculations comprise calculated result data and a cloud.
8. The safety assessment method for the basic uneven settlement truss type crossing pipeline as claimed in claim 1, wherein the extraction process of the VB post-processing program is implemented by taking a Shell function in VB as a medium, connecting an ANSYS operation program to the function, so that ANSYS is called under a VB interaction interface to realize the connection of ANSYS and VB, then reading APDL command streams by operating the existing developed ANSYS macro program to automatically solve, and displaying the obtained results in the VB interaction interface through a VB built-in control, so that the data transmission between ANSYS and VB is realized, and the calculation results of ANSYS can be viewed under the VB interaction interface.
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Cited By (3)
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| CN112270116A (en) * | 2020-09-25 | 2021-01-26 | 珠海格力电器股份有限公司 | Product packaging and transporting statics analysis method, platform, storage medium and application |
| CN112632654A (en) * | 2020-11-04 | 2021-04-09 | 中国一冶集团有限公司 | Simulation method of temperature field and stress field in pipe gallery construction process based on ANSYS platform |
| CN113158506A (en) * | 2021-02-02 | 2021-07-23 | 海洋石油工程股份有限公司 | Method for analyzing stress of LNG (liquefied Natural gas) full-capacity storage tank under action of seismic load |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112270116A (en) * | 2020-09-25 | 2021-01-26 | 珠海格力电器股份有限公司 | Product packaging and transporting statics analysis method, platform, storage medium and application |
| CN112270116B (en) * | 2020-09-25 | 2024-06-21 | 珠海格力电器股份有限公司 | Product package transportation statics analysis method, platform, storage medium and application |
| CN112632654A (en) * | 2020-11-04 | 2021-04-09 | 中国一冶集团有限公司 | Simulation method of temperature field and stress field in pipe gallery construction process based on ANSYS platform |
| CN112632654B (en) * | 2020-11-04 | 2024-02-27 | 中国一冶集团有限公司 | Simulation method for temperature field and stress field of pipe gallery construction process based on ANSYS platform |
| CN113158506A (en) * | 2021-02-02 | 2021-07-23 | 海洋石油工程股份有限公司 | Method for analyzing stress of LNG (liquefied Natural gas) full-capacity storage tank under action of seismic load |
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Application publication date: 20200821 |