Automatic Identification Method for Natural Frequency of Bridge Piers by Microtremor Measurement at Both Sides on Top of Pier

Abstract

The natural frequency of a bridge pier is used as an index to evaluate the soundness of pier foundations. However, using conventional approaches, it is sometimes difficult to obtain the natural frequency derived from microtremor, because the peak of the Fourier spectrum of the bridge piers derived from the microtremor does not appear clearly in many cases compared with that derived from the impact vibration test. In this paper, we propose a method that can automatically identify the natural frequencies using only derived from microtremor measurement results at both sides on the top of piers, without renewing the latest result of impact vibration test.