EXTRACTION OF THE AGING OF A ROCKING SDOF SYSTEM MODELING THE RC BRIDGE PIER BY USING THE WAVELET TRANSFORM

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  • ウェーブレット変換によるRC橋脚をモデル化した回転１自由度系の経年劣化抽出

Abstract

 The aging of numerous infrastructures that were constructed during the high economic growth period of Japan constitutes one of the current social issues. Additionally, irregular external excitations, such as earthquakes, cause damage to the structures, it thereby decreasing the original performance of structures and leading to changes in their natural frequency and damping characteristic. If these changes can be detected, it will be possible to evaluate the degree of aging of the structure, and enable health monitoring. The Fourier transform is one of the methods to detect the damage to the structure. However, the damage is dependent on the characteristic of the wave pattern. Moreover, the provided frequency characteristic has a limitation in that information is dependent on the time history at all times. In this study, we constructed the earthquake resistant design in accordance to specifications for highway bridges (2012 edition) for a single RC bridge pier and presented the M-Φ relationship for a specific pier base to allow the description of the M-θ relationship of the rocking SDOF model. Furthermore, we carried out a non-linear response analysis and performed the characteristic extraction of the acceleration wave pattern using the discrete wavelet transform and the wavelet spectrum. We concurrently examined the bending moment and the angle of rotation in consideration of aging with regard to the M-θ relationship and the vertical axis and the horizontal axis was examined whether detectable changes in the earthquake resistance by multiplying n. As a result of these analyses, decomposition coefficients estimated from the maximum value of the wavelet coefficients is increased owing to aging, and the frequency is confirmed to be reduced.

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