1. THE DESIGN PROCESS

2. General Design Process Need –Determine functional requirements… Specification –Identify essential problems […] –Search for … solution principles –Combine and refine concept variants –Evaluate against technical and economic criteria.

3. General Design Process Concept –Develop preliminary configurations –[Perform] introductory analysis –Select best preliminary design […] Preliminary Design –Refine and complete configuration(s) –Perform detailed analysis of refined design(s) –Prepare preliminary [specifications]

4. General Design Process Definitive Design –Finalize details –[Complete] final analysis and verification –Complete detail drawings […] Documentation Prototype Test and evaluate –From G. Pahl and W. Beitz Engineering Design, The Design Council, Springer-Verlag, NY, 1984.

5. Structural Design Process Conceptual design –Layout (location, size, shape, spans) –Materials (steel, concrete, masonry, timber) –Performance requirements –Cost estimates

6. Structural Design Process (cont.) Preliminary Design –Layout framing –Rough sizing of members & foundation –Interaction with mechanical, electrical, etc.

7. Structural Design Process (cont.) Final Design –Detailed analysis –Final member sizes –Preparation of bid documents Inspect and review construction process.

8. Red River Wildlife Management Area

9. Needs: Span two bridge sites Movable to other locations Possible to construct with 2-4 men Aesthetically pleasing and non-intrusive No permanent foundation

10. Specification Minimum span of 80 feet Accommodate all terrain vehicles Snow load/pedestrian load of 100 psf Satisfy ADA

11. Concept: Two-Stage Launch

12. Tied-Back Segmental Construction

13. Fully-Assembled Launch

14. Preliminary Design: Truss Bridge

15. Preliminary Analysis Plan View –Pedestrian Load on Handrail