BCLP-019- External parameter management in BIM Process.

External parameter management

External parameter management, also known as linked parameters or external data management, allows you to dynamically connect? BIM model's object properties to data stored outside the model itself. This can significantly enhance the flexibility, accuracy, and efficiency of? BIM workflow.

Here's a breakdown of key aspects:

What it is:

·??????? Linking? BIM model to external data sources such as spreadsheets,?databases,?or product catalogs.

·??????? Object parameters in the model are associated with corresponding data points in the external source.

·??????? Changes in the external data automatically update the linked parameters in the model,?ensuring consistency and reflecting real-time information.

Benefits:

·??????? Increased accuracy:?Object properties always reflect the latest data,?reducing errors and rework.

·??????? Improved flexibility:?Easily update multiple objects by modifying data in the central source.

·??????? Streamlined workflows:?Automate complex parameter assignments and updates.

·??????? Enhanced collaboration:?Share and maintain consistent data across teams and projects.

·??????? Data-driven decisions:?Analyze object properties based on diverse data points.

Challenges:

·??????? Data validation:?Ensure accuracy and consistency of external data sources.

·??????? Complexity:?Requires careful setup and maintenance of links.

·??????? Software compatibility:?Not all BIM software supports external parameter management.

·??????? Performance:?Managing large datasets can impact model performance.

Common Use Cases:

·??????? Linking product specifications from manufacturer catalogs to BIM objects.

·??????? Updating material costs based on real-time market prices.

·??????? Managing complex variations of objects with numerous parameters.

·??????? Integrating performance data for energy analysis and simulations.

Implementation:

·??????? Select BIM software that supports external parameter management.

·??????? Define? data requirements and identify suitable external data sources.

·??????? Establish clear data mapping and validation procedures.

·??????? Set up links between parameters and corresponding data points in the external source.

·??????? Regularly review and update data to maintain accuracy.

Examples:

·??????? Revit:?Using the "Manage -> Shared Parameters" tool to link parameters to external spreadsheets.

·??????? ArchiCAD:?Utilizing "Parameter Definitions" and "External Databases" tools.

Sample Cases

1. Material Cost Management:

• Data Source:?Spreadsheet containing real-time market prices for building materials.
• Linked Parameters:?Cost per unit,?total material cost for specific elements in the model.
• Benefits:?Automatic budget updates reflecting market fluctuations,?accurate cost estimates throughout the project.

2. Product Selection and Specification:

• Data Source:?Manufacturer product catalog database.
• Linked Parameters:?Dimensions,?performance data,?certifications,?cost information for specific BIM objects.
• Benefits:?Streamlined product selection,?accurate specifications,?reduced data entry errors,?time savings.

3. Building Performance Optimization:

• Data Source:?Building simulation software.
• Linked Parameters:?Material properties like insulation value,?window U-factor,?occupancy schedules.
• Benefits:?Dynamic performance analysis based on design changes,?informed decisions for energy efficiency.

4. Complex Object Variation Management:

• Data Source:?Spreadsheet containing specifications for various object variations (e.g.,?different door sizes).
• Linked Parameters:?Dimensions,?material types,?finishes for specific door instances in the model.
• Benefits:?Ensures consistency across object variations,?simplifies updates,?reduces errors.

5. Sustainability Data Integration:

• Data Source:?Database containing life cycle assessment (LCA) data for building materials.
• Linked Parameters:?Embodied carbon footprint for specific materials used in the BIM model.
• Benefits:?Enables analysis of different design options based on environmental impact,?promotes sustainable material choices.

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Prepared by : Shiju Sasidharan, Sujisha V & BIMLABS Global Research Institute Team.

References :?

·??????? BIM Handbook: A Guide to Building Information Modeling for Owners, Designers, Engineers, Contractors, and Facility Managers.

·??????? Google , Gemini , ChatGPT & Respective Websites

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