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Active Control of Axial Forces in Beam String Space Frames

by Shiro Kato, Toyohashi Univ of Technology, Toyohashi, Japan,
Shoji Nakazawa, Toyohashi Univ of Technology, Toyohashi, Japan,
Yasuo Matsue, Toyohashi Univ of Technology, Toyohashi, Japan,
Tatsuo Yamashita, Toyohashi Univ of Technology, Toyohashi, Japan,



Document Type: Proceeding Paper

Part of: Spatial, Lattice and Tension Structures

Abstract:

The present work discusses a formulation for active control of axial forces of strings in beam string structures to dynamically and/or statically reduce the responses, and proves both the effectiveness of the control and the applicability of the formulation by analyzing two types of structures; one is an ordinary, one way beam string structure stiffened by stressing in tendons and the other is a three dimensional beam string structure stiffened by cables underneath. The target function to be structurally optimized is expressed by combination of the followings; strain energy stored in a structure to be stiffened or softened by active control, and quadratic functions in terms of displacements, velocities and accelerations. In static case, a strategy is discussed to reduce the strain energy stored in the stiffened portion by prestressing and in dynamic cases a strategy of instantaneous optimization for kinematic energy is investigated.

Subject Headings: Space frames | Beams | Structural control | Structural analysis | Axial forces | Active control | Stiffening

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