2024 Volume 3 Issue 1 Pages 126-135
In the construction of a PC box girder bridge using the cantilever method, measurements were carried out using the multi-channel impact elastic wave technique at four distinct phases of combined bending stress (pre-closure). Subsequently, the propagation characteristics of Rayleigh-waves were calculated, including phase velocity and amplitude attenuation. The results revealed a strong correlation between combined bending stress and Rayleigh-wave propagation characteristics, specifically, phase velocity and amplitude attenuation. This discovery led to the proposal of a non-destructive method for assessing combined bending stress. After the installation (post-closure), another round of measurements was conducted to validate the method. The results showed that the estimated combined bending stress using this approach roughly matched well with the design values. Consequently, it has become evident that utilizing the propagation characteristics (phase velocity and amplitude attenuation) of Rayleigh-waves obtained through the multi-channel impact elastic wave technique allows for the accurate non-destructive estimation of combined bending stress affecting the PC box girder bridge.
