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BRIDGE BUILDING ASSIGNMENT. Work with a partner to construct 1 bridge . Last Module Partner. Draw a full size truss pattern from one of the six truss examples. Construct the bridge using balsa wood. Test the efficiency & applied force of the bridge. . BRIDGE SPECIFICATIONS.

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bridge building assignment
BRIDGE BUILDING ASSIGNMENT
  • Work with a partner to construct 1 bridge.
  • Last Module Partner.
  • Draw a full size truss pattern from one of the six truss examples.
  • Construct the bridge using balsa wood.
  • Test the efficiency & applied force of the bridge.
bridge specifications
BRIDGE SPECIFICATIONS
  • Work as a team to design and construct a balsa wood bridge.
  • You may use no more than 7 - 24”x1/8” balsa sticks. (14 ft. total)
  • The bridge must have two identical trusses & a roadbed
  • The bridge must be exactly 10” in length.
  • The test block must fit between the two trusses.
  • No excessive glue blobs.
  • Support weight = Over 50 lbs.
  • Tape may only be used to hold pieces while glue dries.
  • Only two pieces of balsa wood may be laminated together.
slide10

BRIDGES GRADESHEET

TRUSS VIEW DRAWING GRADE

Lines are drawn with ruler. No wavy lines ____ pts. (20)

Lines are 1/8” thick. ____ pts. (20)

Drawing should have neat appearance. ____ pts. (20)

Joints are clearly drawn. ____ pts. (20)

Complete wood usage calculations. ____ pts. (20)

  • ____ pts. (100)

BALSA BRIDGE CONSTRUCTION

Two trusses must be standing vertically. ____ pts. (15)

No excessive glue blobs. ____ pts. (15)

Tight joints. ____ pts. (15)

Roadbed & top pieces do not over hang trusses. ____ pts. (15)

Over 50 lbs. = 40 pts.40 – 49 lbs. = 30 pts. Below 40 lbs. = 20 pts. ____ pts. (40)

____ pts. (100)

truss bridge

The truss bridge...consists of an assembly of triangles. Truss bridges are commonly made from a series of straight, steel bars.

TRUSS BRIDGE
slide12

ROADBED

LEFT ABUTMENT

RIGHT ABUTMENT

BRIDGE TERMS

SUPERSTRUCTURE

ABOVE ROADBED

SUBSTRUCTURE

BELOW ROADBED

SPAN

WATER

slide13

1

1

1

1

2

2

9

9

2

2

9

9

8

8

8

8

0

0

0

0

3

3

4

4

3

3

4

4

5

5

6

6

7

7

5

5

6

6

7

7

10

10

10

10

3

3

2

2

1

1

Baltimore Truss

Warren Truss with Vertical Supports

K Truss

1

1

2

9

2

9

8

8

0

0

3

4

3

4

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7

5

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7

10

10

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1

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Through Truss

Triangular Truss

0

0

1

1

Underneath Deck Truss

TRUSS EXAMPLES

slide16

3

2

1

0

1

WATER

GRADING PROCEDURE

Lines are drawn with ruler (no wavy lines)

Lines are 1/8” thick.

Appearance of drawing (Easy to read)

Complete wood usage calculations.

Joints are clearly drawn.

GRID SIZE = .25

0

1

7

2

3

9

8

4

6

5

10

DO NOT SHADE IN THE LINES!

TRUSS VIEW Drawn by: __________________________________ Block #_____ Date: ____________

slide17

3

2

1

0

1

WATER

GRADING PROCEDURE

Lines are drawn with ruler (no wavy lines)

Lines are 1/8” thick.

Appearance of drawing (Easy to read)

Complete wood usage calculations.

Joints are clearly drawn.

GRID SIZE = .25

0

1

7

2

3

9

8

4

6

5

10

DO NOT SHADE IN THE LINES!

Good joint

Bad joint

TRUSS VIEW Drawn by: __________________________________ Block #_____ Date: ____________

slide18

3

2

1

0

1

WATER

10

GRADING PROCEDURE

Lines are drawn with ruler (no wavy lines)

Lines are 1/8” thick.

Appearance of drawing (Easy to read)

Complete wood usage calculations.

Joints are clearly drawn.

18.25

15.50

43.75

3.6

7.2

GRID SIZE = .25

0

1

7

2

3

9

8

4

6

5

10

8.25”

2.25”

2.25”

2.75”

2.75”

2.75”

2.75”

2”

2”

2”

2”

2”

10”

TRUSS VIEW Drawn by: __________________________________ Block #_____ Date: ____________