Study of Corrosion of Titanium Alloys Vernorris Kelly, REU Assistant from Hampton University Daniel - PowerPoint PPT Presentation

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Study of Corrosion of Titanium Alloys Vernorris Kelly, REU Assistant from Hampton University Daniel

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... answer lies in how each bridge type deals with two important ... Humber Bridge. Golden Gate Bridge. Strait of Messina. Akashi-Kaiko Bridge. Tsing Ma Bridge ... – PowerPoint PPT presentation

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Title: Study of Corrosion of Titanium Alloys Vernorris Kelly, REU Assistant from Hampton University Daniel


1
Bridges
by Jim Dwyer
Sponsored by the National Science Foundations
Materials Research Science Engineering Program
on Micro-and Nano Mechanics of Electronics and
Structural Materials at Brown University.
2
3 Types of Bridges
Beam Bridge
Arch Bridge
Suspension Bridge
3
SPAN
Beam Bridge up to 200 ft. ( 60m )
Arch Bridge up to 1000 ft. ( 300m )
Suspension Bridge up to 7000 ft. ( 2100m )
4
What allows an arch bridge to span greater
distances than a beam bridge, or a suspension
bridge to span a distance seven times that of a
an arch bridge? The answer lies in how each
bridge type deals with two important forces
called compression and tension
  • Compression is a force that acts to compress or
    shorten the thing it is acting on.
  • Tension is a force that acts to expand or
    lengthen the thing it is acting on.

5
Compression and tension are present in all
bridges, and it's the job of the bridge design to
handle these forces without buckling or snapping.

Buckling is what happens when the force of
compression overcomes an object's ability to
handle compression.
Snapping is what happens when tension overcomes
an object's ability to handle tension.
6
Test your knowledge of bridge types by clicking
below !
7
Web sites
Jiangyin Bridge
Golden Gate Bridge
Humber Bridge
Verrazano Bridge
Strait of Messina
Tsing Ma Bridge
Akashi-Kaiko Bridge
Minami Bisan-Seto Bridge
Great Belt Bridge
8
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9
Build a Bridge
Objective
To demonstrate engineering problem solving
through a realistic engineering design exercise.
Approach
Computeraided design of a model suspension
bridge.
10
With the help of professor Allan Bower we decided
on a project to incorporate the use of an excel
spreadsheet into the building of a suspension
bridge.A spreadsheet was designed in which
students can enter key design variables.
Variables
  • Strength of material for columns.
  • Strength of cables used for support.
  • Height and diameter of columns.
  • Span of bridge and length of support cable.
  • Weight of roadway.

11
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12
After completing the spreadsheet, I made kits
for the students to build their bridges using
acrylic, nylon, and PVC for the end posts.
Students will have 4 different choices of
diameter and height to use for their poles from
the 3 materials.
Each type of material will have a different cost
factored in depending on its strength.
The students will have a budget to work with to
construct their bridges and will have to decide
which parts of the bridge they will want to spend
more of their money on.
13
Sample Bridge
14
Conclusions and Future Considerations
Students will be able to see how math fits into
the real world, particularly in engineering, by
using an engineering design exercise.
Students will create their own spreadsheet to
factor in cost and budget of actually building
the suspension bridge.
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