6.地震による構造物の非線型振動について : その2 構造物力学特性の人為的非線型化過程

概要

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In this paper the authors propose the principle of a new earthquake resistant design of the lightweight construction with the original bracings of twisted wires and pretensioned wires. These aseismic bracings must be so designed that the regidity of building structure is properly distributed in each story to avoid distorted vibrations of the structure. Then, it may be expected to avoid the collapse of structure due to resonance when destructive seismic waves are encountered, since the anti-resonant property is given to the structure by the original bracings, that is, the structure becomes to have variable natural period owing to hard-spring characteristics of twisted wires and partial failures of pretensioned wires which, have initially contributed to the rigidity. In order to verify the anti-resonant property thus developed, the solutions of fundamental differential equations for the structure are discussed qualitatively. As the results of those mathematical analyses based on author's improved delta method, we can not only confirm expected nonlinear behaviors of the structure but also may suggest the uncertainity with respect to the existance of so-called jumping phenomenon in nonlinear vibration systems. From the analyses discussed above it may reasonably be said that the artificially nonlinearized structure of this type is a new device for aseismic construction.
1956-03-30