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Spacetruss are three dimensional frame works consisting of pin connected bars. They are characterized by hinged joints with no moments. All members carry only axial compression or tension.
A spacetruss can be formed by two or three layers of grids. A double layer grid consist of two plane grids forming the top and bottom layers, parallel to each other and interconnected by vertical and diagonal members.
A spacetruss is a combination of prefabricated tetrahedral, octahedral or skeleton pyramids or inverted pyramids having triangular, square or hexagonal basis with top and bottom members normally not lying in the same vertical plane.
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Double layer flat grid truss, having greater rigidity allow greater flexibility in layout and permit changes in the positioning of columns. Its high rigidity ensures that the deflections of the structures are within limits.
They are usually built from simple prefabricated units of standard shape. Due to its high indeterminacy, buckling of any member under any concentrated load may not lead to the collapse of the entire structure.
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- Axial members which are preferably tubes.
- Connectors which join the members together
- Bolts connecting members with nodes.
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- They are light, structurally efficient and use materials optimally. It can be designed in such a way that the total weight comes between 15 to 20kg/m2
- It can be built up from simple, prefabricated units of standard size and shape. Hence they can be mass-produced in the factory, can be easily and rapidly assembled at site using semi-skilled labour.
- The small size components simplify the handling, transportation and erection.
- They are an elegant and economical means of covering large column free spaces.
- They allow great flexibility in designing layout and positioning of end supports.
- Services such as lighting, air conditioning etc., can be integrated with space structures.
- The use of complicated and expensive temporary supports during erection are eliminated.
- They posses great rigidity and stiffness for a given span/depth ratio and hence are able to resist large concentrated and unsymmetrical loading. Local overloading can be taken care by built-in reserve strength. They do not collapse locally
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