平行クランク機構の機能をもつ構造物の力学的性質について

概要

論文の詳細を見る
It has been proved that a system comprising a rigid body, a foundation and a number of bars each having one end coupled to the rigid body via a three-dimensional pin and the other end coupled to the foundation via another three-dimensional pin, has at least one degree of freedom allowing translation of the rigid body along a circular locus, provided that the lengths and directions of all the bars are the same as viewed in a projection on one plane. In case that the system comprises 5 bars, generally the system has one degree of freedom and no statical-indeterminacy. In case that the system comprises 6 or more (γ) bars, generally the system has one degree of freedom and (γ-5) degree of staticalindeterminacy. In the latter case, if the system is subjected to prestress, the potential energy due to the prestress and the gravity is a function of the position of the rigid body in the system, and the system becomes equilibrium when it takes a configuration which minimizes the potential energy. A tower could be constructed connecting systems like this unit system.
社団法人日本建築学会の論文
1976-08-30