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| Comparison Analysis on Train-Bridge-Interaction Indicators Based on Different Track Spectrum |
| HUANG Zhi-tang CUI Sheng-ai DOU Sheng tan Tang Che |
| School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract In order to analyze effect of Train-Bridge-interaction indicators based on different track spectrum, taking German high speed low disturbance spectrum, German high speed high disturbance spectrum, and Qinhuangdao-Shenyang Passenger dedicated line track spectrum as comparative objects, the differences are analyzed of three kinds of track irregularity power spectrum density, and the time sample of three kinds of spectrum are obtained by trigonometric series method. Numerical analysis of Train-Bridge coupled vibration is carried out with the kinds of track irregularities as external excitation, and wheel unloading rate, car-body vibration acceleration, mid-span dynamic displacement of bridge, and mid-span acceleration of bridge are selected as dynamic indicators for comparison. The results show that: the effect of wheel unloading rate in size due to the shorter wavelength components of vertical profile irregularity is obvious, and the law is similar to the values of vertical profile irregularities within the range of the shorter wavelength. The car-body lateral and vertical vibration acceleration are mainly affected by the longer wavelength components of alignment and vertical track irregularity respectively, and the difference in alignment and vertical irregularity power spectra reflects the difference of car-body lateral and vertical vibration acceleration. The effect of dynamic displacement of bridge by irregularity excitation is very small, and the dynamic displacement of bridge is very close under three kinds of spectrum. The impact of bridge vibration acceleration by track irregularity is bigger, and the value of bridge vibration acceleration under the German high speed high disturbance spectrum and Qin-Shen passenger dedicated line track spectrum are significantly larger than the German high speed low disturbance spectrum. In addition, the results also show that impact on bridge lateral acceleration by track irregularity is more obvious compared with the bridge vertical acceleration.
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Received: 28 February 2012
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2012, Vol. 31 
