FUNDAMENTAL STUDY ON THE APPLICABILITY OF ACCELERATION SENSORS EMBEDDED IN SMARTPHONES TO BRIDGE VIBRATION MEASUREMENT

Abstract

 Many studies have been conducted to detect abnormalities, monitor the condition, and evaluate the health of bridges by vibration measurement, but there are few examples of long-term, periodic measurement and utilization of such measurements in practice. One of the reasons for this is the high cycle cost of vibration measurement. In this study, we confirmed the applicability of an accelerometer built into a smartphone to bridge vibration measurement, which can be an easy-to-use vibration measurement method in practice. As a result, the noise level of the accelerometer built into the smartphone was about 10 mGal^*sec at maximum in the frequency domain. Experimental results also showed that by striking the steel girder bridge with a wooden kakeya weighing about 3.62 kg, the natural vibration characteristics of the bridge could be measured even with the sensitivity of the smartphone's built-in accelerometer.