Geometry Modeling Techniques for Bridge Engineers

June 1, 2020
BLOG TIPS & TUTORIALS

In May 2020,  we hosted a webinar, “Mastering midas Civil : Geometry Modeling Techniques for Bridge Engineers Seeking for More" by Jihoon Kang, Training Manager/MIDASIT.

 

We will start creating geometry models efficiently, following Lesson 1. GUI Techniques. In midas Civil, we can simply create 1D, 2D, and 3D elements and easily generate complex bridge models with a few buttons through the wizard function. Even engineers who have a lot of experience of midas Civil might not know the role and effectiveness of the detailed options for modeling.


In this session, we compared the differences from each option and used all the options. This course will be effective for the engineers who have just started with midas Civil and engineers using only the same functions of midas Civil.

 


This case study highlights:

 

 

1. Things to know when importing DXF files from CAD

midas Civil provides various functions for creating elements simply, and importing CAD files is convenient for complex modeling. The webinar explained the points in detail to be careful when importing files.

 

 

2. How to create/modify nodes and elements

There are a lot of ways to create elements depending on the type of model. We can easily modify element parameters to change the attributes of an element. The webinar also introduced the auto-generating of meshes on the 2D element. 

 

3. How to use tables and MCT command shell

MCT Command shell is a powerful function to load and edit specific data of the model. It is a very useful function for the engineer to manage and edit data of the model.

 


 

1. Import CAD file(*.dxf)

 

Import CAD file(*.dxf) is one of the modeling methods in midas Civil. Using this method is easier than creating nodes or elements directly in midas Civil when a target structure has an irregular shape.  Available objects in CAD SW are Line, Poly Line, Face, and Curve. When those are imported, staring points and endpoints will be nodes and connecting lines will be frame elements. If there is a closed face, it will be a planar element.

 

Import CAD file(*.dxf)
Fig. Import CAD File

 

 


 

2. Node/Element Menu - Manual Modeling

 

Structure models in midas Civil consist of nodes and elements. Therefore, we need to create nodes and elements in order to generate a structural model. Furthermore, we will use some options to modify the model if we need.  Related functions are shown below.

 

1. Create Nodes: function to create nodes.
2. Translate Nodes: copy or move nodes.
3. Create Elements: function to create elements.
4. Change Element Parameters: is to modify element properties.
5. Renumbering: assign a new ID number to nodes or elements.
6. Other functions about Edit: modify or edit nodes or elements to create a structural model.

 

Various Functions in Node/Element Menu
Fig. Various Functions in Node/Element Menu

 

 

 

 

 

Auto Mesh Function - For Plate Elements 

 

If the users has a plan to create a structural model with planar elements, it would be a good option for modeling. Auto Mesh and Map Mesh functions help the users divide planar elements for their plans.


  Auto Mesh Function - For Plate Elements 

Example of Auto & Map Mesh Function
Fig. Example of Auto & Map Mesh Function

 

 

 

 

 

Various Wizard Functions - Automatic Bridge Modeling

 

midas Civil provides various wizard functions to help the user model their structure model quickly and easily. Base Structure wizard has some choices for typical and basic structural shapes such as Beams, Columns, Archs, Frames(Grillages), Trusses, or Plate faces.

 

Base Structure Wizard
Fig. Base Structure Wizard

 

There are special wizard functions in midas Civil for various bridge types.

 

 

Various Bridge Wizards 1

Various Bridge Wizards 2

Various Bridge Wizards 3
Fig. Various Bridge Wizards

 

 


 

 

3. Table/MCT Command Shell - Table/Text Formatted Modeling

 

All data in midas Civil can be edited with texts. All data are provided in the table format. And those are extracted as *.mct file and also it can be checked in MCT Command Shell. All data can be copied into the spreadsheet. Therefore, manage your data in a preferred space.

 

Data in Table FormatFig. Data in Table Format

 

MCT Command Shell

Fig. MCT Command Shell

 

Export MCT file

Fig. Export MCT file

 

 


 

Watch the full webinar video

 

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Ji Hoon Kang | Lead Engineer | MIDAS IT

His main role is to work closely with bridge engineers around the world to ensure they are satisfied with midas Civil and to listen the areas of improvement. He also manages multiple training programs to show the shortest path to successfully complete their bridge projects.

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midas Civil tips&tutorial of the Geometry Modeling Techniques
for Bridge Engineers Seeking for More

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