Multiple Regression Analysis of Natural Frequency Changes Observed at Concrete Gravity Dams

Abstract

Towards the establishment of a method for structural soundness evaluation of concrete dams focusing on their vibration characteristics change, natural frequency changes of dam body were investigated throughout microtremor measurement and earthquake motion record analysis. Based on the results, a physically-based multiple regression model was proposed and discussed for trend estimation of natural frequencies considering the effects of reservoir water depth and external temperature changes those should be separated from the effects due to deterioration or damages.