These are 12 BIM knowledge points! You must understand.

BIM modeling process

1.Establish network and floor line

When architects draw a building project design drawings, construction drawings, the network technology and different floors are very important basis,Bentley ProjectWise sampling, column position judgment must rely on the grid in order to allow students on-site management of the construction staff can find the correct use of the location of the foundation. Floor lines are the basis for expressing the height of the floor, and also describe the location of beams, wall height development and floor slabs.

2. Importing CAD files

CAD file imported into the software, can facilitate the subsequent columns, beams,Bentley BIM slabs, wall establishment, you can directly click on the drawings or according to the drawings to draw. When importing CAD, pay attention to whether the units and gridlines are consistent with the CAD drawings.

3. Establishment of columns and beams

Columns, beams, plates, walls and other components in accordance with the drawings placed on the model,BIM Viewer according to different types of components to choose the appropriate form of drawing.

4.Colorful appearance

As an important tool for visual communication, architects and customers discuss the design, you can use the 3D model to discuss the building form, spatial image and whether the architect's design can meet the owner's requirements.

5. Output to CAD drawings and schedules.

At present in Singapore and other BIM application research earlier countries, its construction management unit development has been able to accept the architect to pay the three-dimensional structure of the building enterprise information system model can be used as the basis for the review of drawings. In addition to the various types of drawings, the 3D building information management model can also output quantities and calculation tables, which is convenient for designers to analyze and calculate the quantities, and if there is no change in the design, the quantities of details can be changed automatically.

BIM Modeling Accuracy

The level of detail in a model is called the level of detail, or development level. It describes the steps involved in developing a unit of BIM model components, from the lowest level of approximate conceptualization to the highest level of presentation-level accuracy.The definition of LOD can be used in two ways: to determine the output of the model phase and to assign modeling tasks.

1. Model Phase Outputs

Different model component units will be promoted from one LOD level to the next at different rates.

2. Assigning Modeling Tasks

In addition to 3D representations, BIM model component units can contain a large amount of information that can be provided by multiple parties.

Classification of LOD Levels

From conceptual design to finished design, LOD is defined in five levels, i.e. L0D 100 to LOD 500. In the practical application of BIM, the first task is to determine the LOD level according to the different stages of the project and the specific purpose of the project, and to determine the modeling accuracy according to the model accuracy requirements summarized in different levels.

1.LOD 100-Conceptual Conceptualization

This level is equivalent to the conceptual design, the model at this stage usually represents the building volume of the overall type of analysis of the building, including volume, building orientation, cost per square meter and so on.

2. Lod 200-Approximate Geometric Approximate Components (Program and Extension)

This level is equivalent to the schematic or preliminary design, and the model at this stage contains information on the number of approximations, sizes, shapes, positions, orientations, etc. contained in the universe system.

3.LOD 300-Precise geometry precise control components (construction drawings and deepening design construction drawings)

This level is equivalent to the deepening of the traditional construction drawing level and the improvement of the construction drawing level. The model at this stage should include information such as component attributes and parameters specified by the owner in the BIM submittal standard, and is already well used for cost estimating and construction coordination.

4. LOD 400-Fabrication Processing

The model at this stage can be used for fabrication and installation of model units, such as processing and fabrication of project components by specialty contractors and manufacturers.

5. LOD 500-Completed

The model at this stage represents the project as-built and will contain the complete set of component parameters and attributes developed in the Owner's BIM submittal instructions, and will serve as a centralized management database for integration into China State Construction Company's operations and maintenance social systems efforts.