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Tri-3 spaceframe: (three-way triangular outer grid over three-way hexagonal inner grid) |
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The Tri-3 spaceframe is created by periodically removing groups of six struts from the |
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inner layer of the Tri-1 design. This forms a honeycomb-like inner layer of edge-connected |
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hexagons. Some diagonal struts are also removed. |
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As with the model of the Tri-1 unit cell shown previously, the depth of the Tri-3 model can |
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be varied by using right triangles (RT), large triangles (LT), or isosceles triangles (IT). |
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A stability analysis of the unit cell of the Tri-3 spaceframe indicates that it is inherently |
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unstable (Fig. 238 a) |
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Theoretically, the cell can be stabilized by inserting three more bracing struts as shown in |
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either b) or c) above to create a hybrid structure. Or rigid panels or skylights can be |
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inserted into the hexagonal openings of the inner layer to stabilize the structure by means |
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of plate action as shown in Fig. 239 following. Either way, adequate perimeter support |
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must be provided to help stabilize the structure. |
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Back to Knowhere |
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