Hex-3 spaceframe:  (three-way hexagon and small triangle outer grid staggered over

                                truncated triangle and small triangle inner grid)

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Opening up the triangulated lattice even further results in the Hex-3 spaceframe.

 

hex-3_spaceframe

hex-3_spaceframe

hex-3_spaceframe

click image to enlarge

a) outer grid

b) inner grid

c) strut diagram

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Fig. 244 - Hex-3 spaceframe  [demonstration model constructed with small triangles (ST) ]*

* can also be built with RT, LT, or IT

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Like the Tri-3 and Tri-5 spaceframes from which it can be derived, the Hex-3 unit cell is

unstable.   Theoretically three more bracing struts are needed to stabilize it.

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hex-3_spaceframe.jpg

hex-3_spaceframe.jpg

 

Fig. 245 - Stability analysis

of the Hex-3 unit cell

 

(demonstration model)

click image to enlarge

 

a)   M = 36   J = 15

b)   M = 39    J = 15

 

36 < 3 ( 15 ) - 6

39 = 3 ( 15 ) - 6

 

unstable, need + 3 M

stable

 

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Due to the openness of the design, the Hex-3 spaceframe is useful for open lattice structures

such as supports for stage lighting and displays.  Also panels or skylights can be inserted
into the large openings in the inner and outer layers thereby stabilizing them.

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Page 140 - Building stability - Hex-3 spaceframe

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