Prestressed Continuous Bridge Evaluation using Structural Health Monitoring System

Abstract

Dorim Goh is a prestressed concrete (PSC) continuous bridge in Seuol, Korea. The structural health monitoring is used to assess the behavior of this bridge. 12 strain, 6 displacement and two accelerometer sensors are used to collect the behavior of the bridge under static and dynamic loads. The low-pass filter is used to estimate the static behavior of bridge and extract the accurate values for the bridge performances. Six's cases of static loads and truck's speeds from 10 to 60 Km/h are evaluated. The maximum strain and deflection collect during static loads are 60 μϵ and 1.8 mm, respectively. Moreover, the distribution of stress on the bridge deck is assessed, and we find that the bridge status is safe under static loads. The dynamic factor (DF) is calculated during dynamic test, and the results show that the maximum DF is 0.228. In addition, Fast Fourier Transformation (FFT) is used to estimate the dominant frequency of bridge. The dominant frequency is estimated from acceleration measurements after filtering the collection data; the results show that the dominant frequency of bridge girder is 4.94 Hz. The results are compared with the design simulation model results and we find that the bridge is safe under applied loads.