the design process. general design process need –determine functional requirements…...
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THE DESIGN PROCESS
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.
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]
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.
Structural Design Process
• Conceptual design– Layout (location, size, shape, spans)– Materials (steel, concrete, masonry, timber)– Performance requirements– Cost estimates
Structural Design Process (cont.)
• Preliminary Design– Layout framing– Rough sizing of members & foundation– Interaction with mechanical, electrical, etc.
Structural Design Process (cont.)
• Final Design– Detailed analysis– Final member sizes– Preparation of bid documents
• Inspect and review construction process.
Red River Wildlife Management Area
Needs:
• Span two bridge sites
• Movable to other locations
• Possible to construct with 2-4 men
• Aesthetically pleasing and non-intrusive
• No permanent foundation
Specification
• Minimum span of 80 feet
• Accommodate all terrain vehicles
• Snow load/pedestrian load of 100 psf
• Satisfy ADA
Concept: Two-Stage Launch
Tied-Back Segmental Construction
Fully-Assembled Launch
Preliminary Design: Truss Bridge
Preliminary Analysis
• Plan View– Pedestrian Load on Handrail