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Background:
Founded in 1802,
the United States Military Academy at West Point was the first school
in the U.S. to offer a formal program of instruction in engineering. During
the first half of the 19th century, civil engineering was the foundation
of the West Point curriculum. Academy graduates of that era designed and
built many of the young nation's railroads, bridges, harbors, and roads.
This contest commemorates West Point's engineering heritage and its role
in developing the nation's infrastructure.
Hudson
River at West Point
MIT+K12:
Truss Bridges
Intro:
Demonstrate
straw&pin beam- first without diagonals,then with straw and string
diagonals- note lengthening and shortening of diagonals as beam is flexed.
A truss
keeps all members purely in tension and compression.
Lesson 1:
- Convene in Digital
Photo Lab- Open West Point Bridge Designer
- Load Sample Design-
Warren Deck Truss 20Meter Span
- Note Initial Cost:
$261,000
- Edit name
- "Save As"
to student folder
- Review basic Tools
- Load Test
- Revision cycle-
In Drawing board mode- select members, reduce size until failure, then
increase- maximum cost= $185,000
- Note colors/ ratios--ratios
should be >0.6 and <0.95
- Print Out Screen
Shot--command+shift +3 or 4
On-line
tutorial- WPBD
Demo
using 20M Warren Truss
Extra Time- optimize
Pratt Deck Truss 44 Meters
LESSON 2: Who will
be PONTIFEX MAXIMUS?
Optimizing
Member size Using Ratios:
- Review optimizing
using load test results:
Force/strength ratios should be between 0.8 and .99- if greater than
1.0, become bright red or blue(failed!)
- Comparison:
- A weight lifter
can lift 100 lbs.
If he is lifting 90 lbs, how much of his capacity is he lifting?
(0.9)?
- If he is lifting
100 lbs, he is straining to hold it.(1.0)
- If he tries
to hold up 110 lbs, he is at 110% of his capacity, and he drops
it
- Click at top of
column to sort by values
- To select a range
of values, click on one end of the range, press shift, then click on
the other end of the range.
Buildings,
bridges, and other structures are not only functional, but need to be
beautiful as well-- the forms of the Zakim Bridge echoes not only the
Bunker Hill Monument, but the stays of the USS Constitution
Lesson 3:
• Design Original arch bridge with a Cost below $260,000 ($230,000
possible)
Deck Elevation=
24 meters
Arch Height = 12
meters
• New Design
• Select
- Elevation-24
Meters
- Arch Abutments;
Height of Arch=12 meters
- No Piers
- No Anchorages
- Templates( templates
are suggestions only- try making your own design)
- Design by_______________
- Review optimizing
using load test results:
Force/strength ratios should be between 0.7 and .99- if greater than
1.0, become bright red or blue(failed!)
Note properties of
hollow tubes vs bars
Printing the
Design:Demo
- File- Print
the Design; ‘Save as’ to student file
- Color Print of
Design:
- Do Screen Shot
of Drawing Board, showing force/strength ratios- (On Mac: Control
+ Option+3)
- Print Screen
Shot on HP 145
Extra time- work on
own design
Lesson 4:
Optimize
Cable-Stayed or Suspension Bridge from sample
design - Less than $220,000- force/strength ratios should all
be 0.7- 0.9.
Note properties of
hollow tubes vs bars
Note how components
interact
National
Geographic Video: Superbridge
- Do Screen Shot
of Drawing Board, showing force/strength ratios- (On Mac: Control +
Option+3)
- Print Screen Shot
on HP 145 printer
Extra Credit: Design "Folly" bridge- Must be functional as well
as artistically interesting
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Engineers Without
Borders
Assignment
Handout
File
Folder Bridges
Download
WPBD
Video
Links
Tacoma
Narrows Bridge Collapse
Cool
Designs-1- Youtube
WTFBridge
#2
WTF#3
Cheap
Arch
Composition
of Steel
History
of Steelmaking
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