Cable-strut systems: Part II — Cable-strut

Abstract

In this part, the basic concept of cable-strut systems is introduced. Cable-strut systems, including reciprocal prism (RP) and cell pyramidal (CP) grids invented by the author, as successful attempts to introduce cables into simplexes to form grids, are revolutions in space structures. Their properties are presented in this paper. Cable-strut systems possess self-stressed equilibrium, avoiding reliance on a bulky anchorage system, which is a most important advantage in construction over conventional flexible structures. It has improved greatly the structural properties of tensegrity systems, which also possess self-stressed equilibrium. Its planar form becomes the lightest self-stressed equilibrium space bar systems. The additional advantages over conventional space bar systems are that its joint design can be simplified, and its grid depth and grid length can be adjusted easily to sustain large bar forces and to lower bar forces further. Moreover, its stiffness can be increased by introducing bars to replace connecting cables to form double-layer and triple-layer forms. Super-span domical and cylindrical forms of RP system have also proved to be feasible and economical. The advantage of cable-strut systems in architecture is that the systems are clear in sense of sight, which makes them very attractive.