Tri-6
spaceframe: (three-way hexagon and small triangle outer grid
over three-way |
large triangle inner grid) |
. |
The
tri-6 spaceframe design is unique compared to the other spaceframes
because it |
cannot
be sliced out of the octet truss. As a result, the Polymorf model of
it is comprised of |
several
different types of panels. |
|
 |
 |
 |
click image to enlarge |
a) outer grid |
b) inner grid |
c) side view |
. |
Fig. 246 - Tri-6 spaceframe [static demonstration model built with
IT (blue), RT (green), ST (red), SS (orange) ] |
|
. |
[Note:
The orange colored panels (bracing struts) shown in the above model are
not used |
in the
real-life spaceframe. Instead the struts forming the large
triangular inner grid |
(shown
green here) span from vertex to vertex in one piece.] |
. |
 |
 |
click image to enlarge |
IT (blue), RT (green) |
Fig. 247 - Strut diagram of |
Fig. 248 - Tri-6 unit cell stability |
the
Tri-6 spaceframe |
M = 12 J = 6 |
|
12 = 3 ( 6 ) - 6 stable |
|
. |
The
stability analysis of the Tri-6 unit cell shown in Fig. 248 above reveals
that it is stable. |
Therefore so is the spaceframe (presuming of course that each strut making
up the |
inner
large triangle grid is one solid piece instead of the jointed strut
modeled here). |
. |
Tri-6 is suitable for short to medium spans. |
 |
Skylights can be inserted into the hexagonal |
openings of the outer grid. |
|
Fig. 249 - Boat slip with Tri-6 |
spaceframe cover ► |
(scale visualization model) |
click image to enlarge |
|
. |
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to Knowhere |
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Page 141
- Building stability - Tri-6 spaceframe |
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