Prefabricated Steel Bridge Systems: Final Report

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• Project Summary

1. Introduction
   1. 1.1 State of the Problem and Background
   2. 1.2 Objectives of the Study
   3. 1.3 Organization of the Report
2. Historical Background Of Steel Bridges
   1. 2.1 Superstructures
      1. 2.1.1 Temporary Bridges / Emergency Bridges
      2. 2.1.2 Permanent Bridges
   2. 2.2 Substructures.
      1. 2.2.1 Prefabricated Steel Piers.
   3. 2.3 Bibliography
3. Accelerated Construction - Minimum System Requirements
   1. 3.1 Conventional Construction and Erection Techniques.
      1. 3.1.1 Configurations of Modular Systems
      2. 3.1.2 Cost Effectiveness / Standardization
      3. 3.1.3 Conventional Fabrication Methods
      4. 3.1.4 Construction Issues Associated With Modular Bridge Systems
      5. 3.1.5 Transportation and Erection Issues
      6. 3.1.6 Design Loads and 75-Year Service Life
      7. 3.1.7 Future Maintenance
4. New Concepts For Accelerated Bridge Construction
   1. 4.1 Evaluation of Existing Systems
   2. 4.2 New Systems Development
      1. 4.2.1 Modular Cast-in-Place System
      2. 4.2.2 Modular Precast System
5. Optimization
   1. 5.1 Review of Global Optimization Methods
      1. 5.1.1 Review of methods and strategies.
      2. 5.1.2 Review of Work Related to Steel Section Optimization
   2. 5.2 Problem Formulation
      1. 5.2.1 Design Parameters
      2. 5.2.2 Design Objectives
      3. 5.2.3 Assumptions
      4. 5.2.4 Design Constraints
      5. 5.2.5 Optimization Flow Chart
   3. 5.3 Optimization Strategies and Methodology Used
      1. 5.3.1 Overview
      2. 5.3.2 Genetic Algorithms (GA)
      3. 5.3.3 Surrogate Based Optimization (SBO)
   4. 5.4 References
6. Optimization Results And Discussions
   1. 6.1 Studied Parameters and Limits Considerations.
   2. 6.2 Presentation and Discussion of Results
      1. 6.2.1 Effect of Slab Thickness
      2. 6.2.2 Effect of Concrete Strength
      3. 6.2.3 Effect of Type of Concrete
7. Conclusions And Recommendations
   1. 7.1 Conclusions
   2. 7.2 Recommendations
8. Appendix A - GA Optimization
9. Appendix B - SBO Optimization

FHWA-IF-06-044