Introduction Manual for Natural Frequency Identification System of Bridge Piers by Constant Microtremor Measurement

Abstract

In recent years, disasters have frequently occurred due to rapid river flooding and prolonged high water levels caused by typhoons and localized heavy rainfall. It is, therefore, necessary to establish a method for monitoring the destabilization of river piers during periods of rising water. In response to this need, we have prepared an introduction manual for a natural frequency identification system, which includes an algorithm for identifying the natural frequencies of piers from microtremor measurements, the basic specifications of acceleration sensors required to construct a microtremor measurement system, the application conditions of this system, and methods for evaluating the measurement results.