The reports of building characteristic measurements in huge earthquakes show that viscous dampers are useful to reduce building acceleration. The formula of those damper characteristics is often relative to velocity in analysis. However the latest studies have shown that they depended on not only frequency and strain but also velocity. This means that analysis using the formula cannot always lead to exact results. Part 2 of this thesis showed the model of viscous fluid material properties under small strain, and it was not complex because it depended on frequency. This thesis proposes a model of the material affected by frequency and larger strains.
