Parameter-Driven Creation of 2D Traditional Style

Drawings, 3D Models, and Analytical Models: A Quantum Leap in Efficiency

Doug Dunrud, WSP IBC 24-XX

Bridge Modeling Basic Principles

1. Accurate

The number one reason to model bridges is to build virtually what we intend to build physically so that delays and cost over-runs can be avoided during construction.

2. Fast
Unless we can produce construction documentation quickly and efficiently, traditional CAD will continue to be the standard practice.

3. Dynamic

Change management is facilitated by utilizing construction documentation that are “extracts” from parametric 3D models.

Paradigm Shift

The Transportation Infrastructure industry needs to transition from putting information on electronic pieces of paper to putting information in 3D models and extracting construction documents from the models.

I. Workflow Comparison

Delivery Workflow

  1. Import .alg and .dtm from OpenRoads
  2. Model bridge geometry (LOD 200)
  3. Producing deliverables (ie plans and quantities)
  4. Interoperability with analysis programs
  5. Clash detection/4D Construction Scheduling
  6. Full development of bridge model (LOD 400)
  7. Export to ifc for fabrication
  8. Create a Digital Twin for Asset Management

Software Platforms

  • Rhinoceros
  • Bentley - OpenBridge/
  • Autodesk - Infraworks/
  • Grasshopper/
  • OpenBrIM
  • OpenBridge/
  • Tekla
  • ProConcrete
  • Dynamo/
  • Revit

Grading System

Level of Effort for Production Users Level of Effort for Automation Developers Limitations
Easy Medium Difficult
Medium Easy Difficult workarounds
No Limitation Some impossibilities

Final Scores

II. Conceptual Design - Visualizations LOD 200 Models

  1. Square feet of deck from model was used for Cost Estimates.
  2. OBM models exported as kmz files to Google Earth for Cost Estimating Team.
  3. Bridge models are coordinated with other disciplines (Roadway, Transit, Bridge Architect, Drainage, etc)
  4. Visualizations utilize bridge models and serve as Quality Control.
  5. Models used for Environmental Documentation including Ship.

III. Preliminary Design - 30% Drawings

Parameter-Driven Creation of 2D Traditional Style Drawings

  1. Automated 2D Drawings are significantly different than 2D “Ports” into the model.
  2. Automated 2D Drawings can produce drawings that are indistinguishable from CAD Drawings.

WSDOT Bridge Seed Files:

I. 2D_Bridge_Drawing_Seed

  • WSDOT Level
  • Annotation Styles
  • Fonts

II. 2D_Bridge_Sheet_Seed

  • Border
  • Title Block “Tags”

OpenBrIM created using 2D_Bridge_Drawing_Seed and then referenced to 2D_Bridge_Sheet_Seed

PROJECT TITLE PROJECT TITLE 1 PROJECT TITLE 2
NO. DATE PROJECT TITLE NO. PROJECT TITLE
BROADCAST LINE

Drawing Production Grading

  1. Accurate - to avoid delays and cost over-runs.
  2. Fast - to produce documentation quickly and efficiently.
  3. Dynamic - to respond to change management utilizing parametric 3D models.

IV. Detailed Design - Design Calculations

Analytical Models

  1. Moving Loads - 3D Influence Surface-Based Analysis
  2. Seismic Analysis
  3. Load Rating Analysis

Seismic Analysis

... Period (sec) Acceleration (g)
1 0.0100 0.3500
2 0.0200 0.3710
3 0.0300 0.3930
... ... ...

Load Rating

  • The Design Model in OpenBrIM can also perform the Load Rating Analysis.
General Deck Reinforcement Cover Plates Section Losses
Girder : Name Girder Station [ft] Load Rating Template Panel Type Modular Ratio Comp. Method Modular Ratio
1 SIGLR1 G1 1788.1570 SIGLRT1 Interior Panel User Input 8.0000

V. LOD 400 Models

  1. 3D Models for Fabrication Coordination
  2. Digital Twins – Asset Management Models

Conclusion

It does not make sense to do Conceptual Design using traditional methods (ie CAD only) and it is a shame to not use the models for the final deliverables.