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Spiral Staircase Kit, self-supporting, exteriordesign study
Wainiha, Kauai, HawaiiNov 6, 2010
by Joseph Osterwww.wingo.com/SketchUp
808-826-5316Spiral Staircase Kit, 17'
two steplanding
Spiral Staircase Kit, self-supporting, exteriordesign study
Wainiha, Kauai, HawaiiNov 6, 2010
by Joseph Osterwww.wingo.com/SketchUp
808-826-5316
4' 0"
2' 1
0"
3' 9
1/2
"
4' 8
1/8
"
1' 5
5/8
" 10 1
/2"
single stair
Spiral Staircase Kit, self-supporting, exteriordesign study
Wainiha, Kauai, HawaiiNov 6, 2010
by Joseph Osterwww.wingo.com/SketchUp
808-826-5316side views
Spiral Staircase Kit, self-supporting, exteriordesign study
Wainiha, Kauai, HawaiiNov 6, 2010
by Joseph Osterwww.wingo.com/SketchUp
808-826-5316first three steps
first three railing posts go to ground
no room for diagonal braceuntil fourth step
Spiral Staircase Kit, self-supporting, exteriordesign study
Wainiha, Kauai, HawaiiNov 6, 2010
by Joseph Osterwww.wingo.com/SketchUp
808-826-5316bottom
5 1/2"
1' 1
0"
2' 6
"
Spiral Staircase Kit, self-supporting, exteriordesign study
Wainiha, Kauai, HawaiiNov 6, 2010
by Joseph Osterwww.wingo.com/SketchUp
808-826-5316tipping force, top view
32.2"
6.4"
13.8
"
• Green colored steps indicate first circle of 18 steps whose CG (center of gravity)is located at the X/Y center
• Yellow steps balance each other, so their CG is also at the X/Y center• 24 out of 30 steps total (4/5ths of total mass) has CG at X/Y center (origin)
• Orange steps, six out of 30 steps (1/5th of total mass), have no matching opposite section, so their CG is calculated at "x"
• Combined CG "+" is located 1/5th the distance from X/Y center to "x" (6.4")• Purple line indicates direction of tipping force; magnitude will be 1.15 times total weight of steps, in ft./lbs. (13.8"/12")• Divide that force by 17', using the full height as a lever, to determine the tipping load at the top (in ft./lbs.)
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