Toothpick Bridge Project RUBRIC   click for printable .pdf file

Date ___________

Student__________________________________ Class_____________

Weight applied  ________________ gms.

Bridge weight  __________________gms.

RATIO: ( weight held in gms / bridge weight in gms ) =  __________

POSSIBLE RAW POINTS:

Calculated Ratio Raw Points Earned
Bridge Weight up to 80 g Bridge Weight 81-100 g Bridge Weight 101-120 g Bridge Weight 120+ g
100+ 100 97 94 90
90-99 99 96 93 89
80-89 98 95 92 88
70-79 97 94 91 87
60-69 96 93 90 86
50-59 95 92 89 85
40-49 94 91 88 84
30-39 93 90 87 83
20-29 92 89 86 82
10-19 91 88 85 81
1-9 90 87 84 80

DEDUCTIONS (APPLIES FOR ALL BRIDGES):

1. Clearance infractions: (underside height, pier width, car clearance, -1 pt. each): 

CIRCLE ONE:   No deductions  -1   -2   -3

2. Bridge deviates from approved drawings (-1 to -10 pts): 

CIRCLE ONE:   No deductions   -1   -2   -3   -4   -5   -6   -7   -8   -9   -10

3. Force analysis: Fg calculated incorrectly (- 1 pt.), FN not correct (-1 pt. for each
    pier calculation), clockwise and counterclockwise torque not correct (-1 pt each)

CIRCLE ONE:   No deductions  -1   -2   -3   -4   -5

IF BRIDGE FAILS UNDER LOAD, COMPLETE THE FOLLOWING:

4. Collapse analysis (explain how, where, and why bridge failed... make suggestions to
    improve design ...use copy of drawing to clearly indicate failure points, -1 to -10 pts): 

CIRCLE ONE:   No deductions  -1   -2   -3   -4   -5   -6   -7   -8   -9   -10

Raw Points Earned  
Less deductions       -
NET PROJECT GRADE  

 

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