An arched
spaceframe can also be constructed so that its outer grid layer is
staggered |
relative
to its inner grid like a conventional planar spaceframe. Four
examples are |
shown
here. In each case the unit cell is unstable but the cylinder built
from it is stable |
and
conforms to the equation M = 3 J. |
. |
Example 1: [two-way
large square (LS) grid staggered over two-way rectangle (REC) grid] |
. |
 |
|
 |
Fig. 276 - Arched spaceframes - 1 |
◄ barrel vault |
cylinder ► |
|
(static demonstration models) |
click image to enlarge |
|
. |
 |
◄ Fig. 277 - Unit cell - 1 |
 |
M = 17 J = 8 |
17 < 3 ( 8 ) - 6, need + 1 M |
LT (red, orange), IT (blue) |
Fig. 278 - Water wheel
► |
(scale visualization model) |
click image to enlarge |
|
. |
Example 2: [two-way large square (LS) grid staggered over
two-way rectangle (REC) grid] |
. |
 |
|
 |
Fig. 279 - Arched spaceframes - 2 |
◄ barrel vault |
cylinder ► |
|
|
|
. |
 |
◄ Fig. 280 - Unit cell - 2 |
 |
M = 17 J = 8 |
17 < 3 ( 8 ) - 6, need + 1 M |
RT (purple, blue), IT (orange) |
Fig. 281 - Deep space |
microwave relay ► |
|
. |
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to Knowhere |
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Page 150
- Building stability - Barrel vaults and cylinders |
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