Abstract
It is important for disaster prevention of structures to understand the dynamic behavior of structure components. In this paper, the dynamic behavior of structure components with stiffness change was investigated by vibration test. Compared to natural frequency between a component without stiffness change and with stiffness change, a component with stiffness change is higher than without one. From the damping ratio point of view, at the upper and lower location with stiffness change, they indicate almost same values.
