リンク式流体慣性ダンパによる構造物の層間変形制御システムの動力学特性に関する研究

抄録

This study proposes a dynamic characteristics of structural displacement control system with Linked Fluid Inertia Mass Damper (LFIMD). In this paper, structural displacement control system is called the link mechanism, and its mechanism is constructed by hydraulic link mechanism. The link mechanism has three distinguishing properties; the first one is adjusting the ratio of story deflection, the second is preserving 1st mode frequency, the third is removing the vibration components in the second and subsequent modes. We know the shear force is redistributed when adjusting deformation with the damper by previous research. In the first part, we derive the redistribution method for shear forces with the theoretical solution for harmonic oscillation. Link mechanism changes the eigenvectors by redistributing the shear force from a relatively strong layer to a relatively weak layer. This system due to give the apparent stiffness to linked layers, and this signs of the stiffness is positive for weak layer and negative for strong layer. In the case of a two-layer structure, as the ratio of the eigenvectors is closer to 2.0, redistribution of shear forces decrease. Finally, we confirmed the relationship between stiffness distribution and the link force by shaking table test. And the test showed that the link mechanism can make story deflection uniform regardless of stiffness distribute.