I am am sorry for the late reply, but somehow, I manage to read the onq's post in full, right now.
But, It seems that Miss/Mrs/Mr "onq" do not read other people's post neither. Here we go:
onq wrote:its not just an add-on "high tech element".
You are right, like I said, its not just an add-on "high tech element", it has also some of these advantages:
george85 wrote:light, fully prefabricated, easy to assemble and erect, light to transport, can cover of huge spans, material savers (the amount of material spend is much less then at the solid systems) etc.
then you said:
onq wrote:It main purpose is to span large areas with minimal mass
and you are right again, like I said:
george85 wrote:light, ... , can cover of huge spans, material savers (the amount of material spend is much less then at the solid systems)
onq wrote:Being a metal structure it might expand significantly under heat gain and either the envelope or its fixings must allow for this.
Insulated aluminum panels or E-low glass panels used for cladding can significantly decrease the direct exposure of the steel/aluminum space frame construction to the sun and heat.
In a case where the construction is more exposed to the sun and heat, the stresses in the members and nodes due to temperature change load, still can not be compared with those from the dead load or snow, as they are much smaller. Apart from this vertical loads, wind load is also a much bigger problem than temperature change you mentioned.
onq wrote:... using a fully triangulated structure.
No. Triangular shape is the most statically stable one, but this does not mean that you can not use a some other shapes. In fact, two layer space frames are in 90 % of the cases done with polyoctaedars (or in western literature: tetrahedrons, pyramid with quadrilateral base - rhomb, rectangle, square). You can even use the pentagon shape...
Also, as you can see, I already used the wiki page about space frames in my first post. But somehow you seemed to missed this too.
Thanks for the answer anyway.