Analyzing Redundancy in Bridge Deck Superstructures Using Finite Element Modeling By Whitney Hill Mentor: Dr. William McCarthy

Preview  Introduction  Computer Methods  Methods  Results  Conclusions

Introduction  Redundancy in Bridges  Definition  Reasons for Redundancy  Diaphragms

Introduction  Purpose  Previous Research on Redundant Systems  Cost  Examples of Non- Redundant Systems  Mianus River Bridge  Hoan Bridge in Milwaukee, Wisconsin  Silver Bridge in Ohio Hoan Bridge Milwaukee, Wisconsin, Before and after failure

Finite Element Modeling Risa 2D Two Dimensional Computer Program Sap 2000 Three Dimensional Computer Program Computer Methods

 Part 1: Models of the bridges are tested using Risa 2D  Part 2: The best representative model(s) are analyzed in Risa 2D  Part 3: A model similar to the best representative model found in Part 2 is done tested in Sap 2000 Project Parts

Methods Part 1  Working with Risa 2D  Horizontal Bracing  Cross Bracing  Loads  Reasons

Examples of Models M2

Examples of Models M2

Methods Part 2  Analysis  Testing  Results Output

Methods Part 3  Sap 2000

Results Member Forces  Horizontally Braced M2M2

Results Member Forces  Cross Braced M2M2

Results Joint Reactions  Horizontally Braced  Cross Braced

Results Member Forces Horizontally Braced Member Label Axial (kip) Shear (kip) Moment (kip*ft) M

Results Member Forces Cross Braced Member Label Axial (kip) Shear (kip) Moment (kip*ft) M

Results Deflected Shape

Results  Deflected Shape

Conclusion  Horizontally versus Cross Braced  A horizontally braced frame has a more uniform load distribution than a cross braced frame.  Future Work  Continuing with Sap 2000

References Barker, Richard M. and Jay A. Puckett. Design of Highway Bridges. New York. Wiley- Interscience Publication Summary of Hoan Bridge Failure Investigation and Retrofit. Lichtenstein Consulting Engineers. 04/05/07. Daniel Webster Hoan Bridge. Lichtenstein Consulting Engineers. 04/05/07.

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