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Modelling
PhysicalGraphical
MathematicalStatistical
Modelling
• Models represent reality– Crash testing – Dangerous procedures can be simulated
Modelling
• Working out ideas or hypothesis by building physical models
Modelling
• Using computers to generate mathematical, graphical or statistical models
West Point Bridge Designer
Modelling using West Point Bridge Designer
• Work through the tasks on the worksheet
• Use the tables to examine Mathematical modelling– The costing data– The load test data– The members property data
• Load test the bridge using the animated graphical interface and test
Modelling using Excel
• Mathematical data can be hard to understand and read, therefore the information can be graphically represented using Excel– Copy the Cost Calculations Report and
paste into Excel– Edit the data so only items that cost,
remain in the spreadsheet– Create 2 types of charts to represent the
different ‘Types of Costs’– Save and Printout
Physical Modelling
• Making the Warren Thru Truss Bridge
– Using the straws and joints to make and test the bridge
– Using the plastic maccarno to build and test the bridge
• Take photos and record all observations
The Purpose of Modelling
• Advantages– Time saved– Cost of materials
reduced– Computer
simulations cost less e.g. car crash testing
– Judge peoples reaction e.g. aesthetics
– Standardisation
• Disadvantages– Simplicity of models
lead to aspects being overlooked
– Scaled models can be misleading
– Mathematical models only as good as the formulas
– Computer models create delusions of infallibility
Modelling
Warren Thru Truss - Types of Cost
$0.00$20,000.00$40,000.00$60,000.00$80,000.00
$100,000.00$120,000.00
Mat
erial
Cost
(M)
Connec
tion
Cost (
C)
Produc
t Cos
t (P)
Deck C
ost
Excav
ation C
ost
Abutm
ent C
ost
Cost
Dennis H. Mahan Memorial Bridge
Cost Calculations Report (Design Iteration #1)
Designed By: I. M. Bridgemaster
11/7/2007
Type of Cost Cost
Material Cost (M) $102,197.12
Connection Cost (C) $3,300.00
Product Cost (P) $600.00
Deck Cost $20,000.00
Excavation Cost $92,000.00
Abutment Cost $8,000.00
TOTAL COST $226,097.12
Warren Thru Truss - Types of Costs
Material Cost (M)
Connection Cost (C)
Product Cost (P)
Deck Cost
Excavation Cost
Abutment Cost
Modelling
• You can model the Warren Thru Truss bridge using Google Sketchup
• Try modelling the bridge using another material– Wood– Spaghetti
Links
• http://bridgecontest.usma.edu/download.htm
• http://www.cardesignonline.com/