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Steel and Composite Structures Volume 40, Number 3, August10 2021 , pages 323-338 DOI: https://doi.org/10.12989/scs.2021.40.3.323 |
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Post-earthquake track irregularity spectrum of high-speed railways continuous girder bridge |
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Yulin Feng, Lizhong Jiang, Wangbao Zhou and Mengcheng Chen
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| Abstract | ||
| To study the track irregularity spectrum for CRTS II ballastless track continuous girder bridge for high-speed railway (CBTCGB) after the action of earthquake, a line-bridge integration seismic calculation model was established. By considering the randomness of structural parameters and ground motion, large amounts of samples were analyzed for additional track irregularity caused by factors such as earthquake-induced damage and earthquake-induced void of key components between the layers of track-bridge system. Using improved Blackman-Turkey method and Levenberg- Marquardt algorithm, the earthquake damaged CBTCGB track irregularity spectrum, track irregularity spectrogram, and a fitting formula for track irregularity spectrum after the action of near-field earthquake were obtained, and the calculation results obtained from the fitting formula and CBTCGB numerical model were compared. The results indicate that the probability sampling distribution of ground motion and structural parameters selected according to "binning method" can effectively reflect the randomness of ground motion and structural parameters. The track irregularity spectrum line forms can be roughly divided into three ranges, namely, high-frequency, medium-frequency, and low-frequency waveband. The tracks suffer more track irregularity diseases with high-frequency after earthquake, which is necessary to conduct tracking analysis. It is rational to use a three-segment power function for the fitting of track irregularity spectrum after the action of earthquake. | ||
| Key Words | ||
| goodness of fit; high-speed railway; Levenberg-Marquardt; track irregularity spectrum | ||
| Address | ||
| Yulin Feng: School of Civil Engineering, Central South University, Changsha, 410075, China; School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China; State key laboratory of performance monitoring and guarantee of rail transportation infrastructure, Nanchang 330013, China Lizhong Jiang and Wangbao Zhou: School of Civil Engineering, Central South University, Changsha, 410075, China National Engineering Laboratory for High Speed Railway Construction, Changsha, 410075, China Mengcheng Chen: School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China; State key laboratory of performance monitoring and guarantee of rail transportation infrastructure, Nanchang 330013, China | ||