Sarrut の機構の能機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 theoretically proved that a system comprising a rigid body, a foundation and a number of bar groups each consisting of 4 bars coupled together at one ends via a three-dimensional pin, the other ends of two of the 4 bars being coupled to the rigid body via three-dimensional pins, and the other ends of the remaining two bars being coupled to the foundation via three-dimensional pins, has at least one degree of freedom allowing vertical translation of the rigid body, provided that in one said group a straight line connecting the pins on the rigid body and a straight line connecting the pins on the foundation are parallel to each other, and that such straight lines on the rigid body and on the foundation in all the groups lie on horizontal plane. In case that the system comprises 5 groups of bars, generally the system has one degree of freedom and no statical-indeterminacy. In case that the system comprises 6 or more (r) groups of bars, generally the system has one degree of freedom and (r-5) degree of statical-indeterminacy. In the latter case, if the system is subjected to prestress, then 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 extensible tower could be constructed connecting systems like this unit system.
社団法人日本建築学会の論文
1977-01-30