Baseline Model Updating During Bridge Construction Using Measured Strains

Masoud SanayeiBrian BrennerErin Santini-BellJesse SippleJohn PhelpsPaul Lefebvre

2010 Structures Congress14 May 2010Orlando, Florida

Presentation Outline

• Background

• Instrumentation

• Load Test

• Modeling

• Data Comparison

• Conclusions

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National Science FoundationPartnership for Innovation

• Stimulate the transformation of knowledge created by the research and education enterprise into innovationsthat create new wealth; build strong local, regional and national economies, and improve the national well-being.

• Broaden the participation of all types of academic institutions and all citizens in activities to meet the diverse workforce needs of the national innovation enterprise.

• Catalyze or enhance enabling infrastructure that is necessary to foster and sustain innovation in the long-term.

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New Bridge Design Paradigm

• Go beyond opening day design– Creation of baseline model– Integrate baseline modeling and model updating

through bridge service life

• Modify reactive mode of bridge management– Develop useful and cost-effective bridge

instrumentation plan– Deploy practical nondestructive tests– Have continuous feedback from bridge about current

health

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Vernon Avenue over the Ware River Bridge Barre, MA

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Image Courtesy of Google Maps

WM Barre Landfill

Vernon Avenue over the Ware River Bridge Barre, MA

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INSTRUMENTATION

2010 Structures Congress

Vernon Avenue Bridge Presentation

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Instrumentation Plan

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Instrumentation Plan

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Instrumentation Plan

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Instrumentation Summary

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100 Strain Gauges36 Temperature Sensors36 Concrete Temperature16 Accelerometers12 Tiltmeters3 SWP4 Bi-Axial Tilt

Summary

Instrumentation by Geocomp

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LOAD TEST

2010 Structures Congress

Vernon Avenue Bridge Presentation

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Concrete Pour

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Load Test

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Load Test

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Load Test

BRIDGE MODELING

2010 Structures Congress

Vernon Avenue Bridge Presentation

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Bridge Modeling

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Model Using SAP2000 Bridge Modeler (BrIM)

Model Using SAP2000 Solid and Shell Elements

Modeling Requirements

• Detailed finite element model that captures bridge performance– Exact geometry– Including bridge components such as diaphragms and

haunch

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DATA COMPARISON

2010 Structures Congress

Vernon Avenue Bridge Presentation

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Concrete Pour Data

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Temperature not included in the SAP2000 frame model

Concrete Pour Data

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Temperature included in the SAP2000 frame model

Objective Functions

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Scalar Objective Function for Crawl Speed Test

Scalar Objective Function for Stop Location Test

Stop Location Load Test

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Stop Location Load Test

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Stop Location Load Test

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Crawl Speed Load Test

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Crawl Speed Load Test

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CONCLUSION

2010 Structures Congress

Vernon Avenue Bridge Presentation

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Conclusions

• Detailed 3D FEM of typical highway bridges is feasible to a high degree of accuracy

• Truck load testing performed on a newly constructed bridge can provide highly reliable strain data for calibrating baseline FEM’s.

• Calibrated FEM and load test strain data matched closely

• A calibrated FEM can be used as an effective tool for bridge management

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Thank You for Listening

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Acknowledgements

NSF-PFI Grant No. 0650258“Whatever Happened to Long Term BridgeDesign?”Program Director: Dr. Sara Nerlove

MassDOT – Bridge Construction

Town of Barre, MA – Bridge Management andOwner

E. T. & L. Corp. – Bridge Contractor

High Steel Structures, Inc. – Steel Fabricator

Atlantic Bridge and Engineering, Inc. – SteelErector

Fay, Spofford & Thorndike, Inc. – Bridge Design

Geocomp Corporation – Instrumentation

Bridge Diagnostics, Inc. – Bridge Testing