Author(s)

M. F. A. Elfawal

Abstract

This study proposes a space truss system called Pin Node Space Truss (PNST) which depends on pin connection between members (hollow pipe) and nodes (perpendicular welded plates) with one degree of freedom – rotation perpendicular to the member axis-in a limited angle that it can produce using an allen bolt connection with special casted item. Structural analyses have been carried out on PNST in order to check the system stability and the stresses, also technical and economical comparisons between PNST and MERO systems were carried out through a case study of two layer grids space truss system. Using PNST of variable depth in two layer grids space systems is the best solution to cover a certain area, which can be achieved to figure out the optimum locations of lower layer nodes that result in maximum allowable stresses in members and the shortest lengths of them. PNST – without special nodes just only change the length of the members – it can give infinite forms and shapes of double grid system or multi-grid systems and it also can change supporting points easily, providing more flexibility in architecture design and easy to fabricate, manufacturing and erection. Keywords: Pin Node Space Truss, PNST, space truss, nodes, two layer grid system, minimum cost, feasibility study, new double grid system.

Keywords

Pin Node Space Truss, PNST, space truss, nodes, two layer gridsystem, minimum cost, feasibility study, new double grid system.