Model structural system

[hoshang]

Hi all
Please find the attached file.
My friend showed me this model. So, I thought it deserves some thoughts. In your opinion, what would be the best structural system for this model?
As shown, the lower triangles are isosceles triangles with 7cm equal sides (corresponding to 7m) and the upper triangles are isosceles triangles with 10cm equal sides (corresponding to 10m).
My first thought is that the lower triangles modelled as cantilever plates supporting one edge of the upper triangle and the apex of the upper triangle supported by the central column. This is for vertical loading.
What about lateral loading?
Your thoughts are highly appreciated.

 

[hoshang]

Hi all
Dosen't this seem a reasonable thread?

 

[JStructsteel]

precast panels?

 

[hoshang]

precast panels?

I asked for the best (vertical and lateral load resisting) structural system for this model.
Do you prefer precast panels?

 

[JStephen]

Do each of the upper triangles have one of the lower triangles supporting it? I can't tell from the picture.
It could be made up from concrete or hollow steel sections.
If those corners can be connected at the top, there wouldn't be any need for a central column, assuming it's anchored to a foundation.
If each upper triangle has a lower triangle attached, I would assume a rigid connection between the triangles, pinned at the base, pinned at the tip.

 

[HTURKAK]

The use of precast concrete could be an option . Assuming the four modules ( each module composed of three panels ) and a compression ring at top ( without central column ) the system could be designed.

However, the wt of each module will be too heavy for transport and erection.

I would prefer the modules made up of steel profiles with metal /GFRC cladding and without central column.

 

[hoshang]

Do each of the upper triangles have one of the lower triangles supporting it?

Yes.

The use of precast concrete could be an option .

How will be the connections?

Assuming the four modules ( each module composed of three panels ) and a compression ring at top ( without central column ) the system could be designed.

Each module is composed of two panels.
As for a compression ring at top, how will be the configuration of this compression ring?

 

[HTURKAK]

But my suggestion is 3 panels. The top could be precast solid pyramid with socket pockets.

 

[hoshang]

A rendered view of the model for clarification.

 

[HouseBoy]

Very cool rendering. Can you provide that from more than one perspective?

Cross Laminated Timber seems like a viable option.
Looks like there is a mast of some sort in the middle running up to the peak. Metal brackets ought to work there.

 

[hoshang]

Hi
What about making a portion of the top triangles look like a folded panel?

 

[prex]

The structure is stable with all connections pinned, so you have a lower triangular plate with two supported sides and one free, and an upper triangular plate, having one supported side and one supported corner for transverse loads, and being essentially supported at the lower corner and pinned at the upper one for in plane loads. Of course the upper corner will be highly stressed, but the reinforcement of the panels (or the steel trellis) is to be designed for that.
For the solution of an equilateral plate with two supported sides look here. Roark has some formulae for triangular plates, but with all three sides supported.

prex
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[hoshang]

so you have a lower triangular plate with two supported sides and one free

I have a lower triangular plate with one supported side.

 

[prex]

Two sides: one is on ground, the other one is supported by the upper triangle: this is of course to check the bending behavior of the plates, before that you have to calculate how the loads distribute among the panels and the center pole, not difficult, only a bit complex because of the uncommon geometry.

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[hoshang]

Two sides: one is on ground, the other one is supported by the upper triangle

The upper triangle should be supported rather than supporting.