Abstract
The quantitative estimation of damping effect is necessitated, when the dynamic response of a structure to such a time-dependent external force as gusty wind, earthquake, or rolling stock on it, is to be obtained. However, it is said impossible to estimate the overall damping of a structure theoretically and one is forced to know it empirically. The present paper is concerned with the damping of bridge superstructure within its elastic range, and consists of the following three parts to contribute the above-mentioned requirement. The authors should like to place special emphasis on Part III in which many data of the logarithmic decrements measured so far with the actual bridge structures in Japan and other countries, were collected and analyzed.
