CIVL 331 Engineering Design Process
Transcript of CIVL 331 Engineering Design Process
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Engineering Design Process
The engineering design process can be defined as a
decision making process using engineering sciences tomeet a desired, measurable goal.
If a product can be engineered with ninety percent of theperformance at fifty percent of the cost, that is good
engineering.
Simple designs to solve complex problems are the mostelegant and complexity for its own sake is unnecessary.
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Sequence of Design Process
1. Establish Functional Specification
2. Concept Design
3. Define Target Values for Functional Requirements
4. Preliminary Design & Analysis
5. Evaluate (o.k = cont., not o.k. = go back to 1. or 2.)
6. Final Design & Analysis
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Functional SpecificationSpecify loads dead, live, wind, seismic, other
Specify space/span requirementsSpecify deflection limits
Specify mechanical function, if any
Specify useful life, if required
Concept Design
Load versus Structural System
Understanding load path
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Structural Systems
Tension hangers, tension ties, tension rings
Compression columns, arches,
compression rings
Bending & Shear beams, trusses
Torsion box beams/columns,
grillage
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Example 1
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Example 2
Loads always flow through the stiffest path
Shorter load paths generally result in more efficient
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Free Body Diagram
A picture of the physical situation you are analyzing, whichdepicts all of the relevant forces acting on the structure of
interest.
Ra Rb
w
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Example 2
Ra Rb
w
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Important factors to consider in Engineering Design
Functionality
Safety
Cost
Aesthetics
MaterialsManufacturability
Method of Construction & Shipping
Maintainability
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Functional Requirements for Engineering Structures
Load carrying/resisting
Vibration/Deflection
Space/Span
Mechanical function(s)
Useful life (fatigue/corrosion)
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Typical Safety Requirements for Engineering Structures
Limit States Design
Codes and standards
Jurisdictional requirements
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Cost Considerations
Engineering cost
Material cost
Manufacturing cost
Shipping cost
Construction costLife cycle cost
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Aesthetics Considerations
Form and style
Environment
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Material Considerations
Strength
Stiffness
Weight
Cost
ManufacturabilityField construction: special process/equipment
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Manufacturability Considerations
Cut/Sheared
Formed
Rolled
Punched/Drilled
Bolted/NailedWelded
Tolerances and distortion
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Method of Construction & Shipping Considerations
Modular construction
Field welded versus field bolted
Max. weight and size for shipping
Crane reach and capacity
Special consideration for remote site
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Maintainability Considerations
Access for inspection and maintenance of mechanicalequipment
Fatigue
Corrosion