INTERACTION RESPONSE OF TRAIN LOADS MOVING OVER A TWO-SPAN CONTINUOUS BEAM
INTERACTION RESPONSE OF TRAIN LOADS MOVING OVER A TWO-SPAN CONTINUOUS BEAM
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DOI：
10.1142/s0219455413500028
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发表时间：
2013-03
影响因子：
3.6
通讯作者：
Ying-jie Wang;Ying-jie Wang;Qingchao Wei;J. Yau
中科院分区：
文献类型：
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作者：
Ying-jie Wang;Ying-jie Wang;Qingchao Wei;J. Yau
摘要本研究旨在探讨两跨连续铁路桥梁在移动列车荷载作用下之共振与次共振加速度反应。连续桥梁被建模为具有均匀跨度长度的Bernoulli-Euler梁，移动列车被模拟为一系列等距的两个自由度（2-DOF）质量弹簧阻尼器单元。采用模态叠加法计算车桥系统的相互作用动力学。数值分析表明：（1）两跨连续梁的列车共振会导致车桥系统动力响应的显著放大;（2）对于两跨连续梁，前两个共振速度可能落在高速列车的运行速度范围内，这会导致车辆响应的高度放大;（3）由于亚共振峰的存在，两跨连续梁的最大加速度不一定出现在梁的中点处;（4）梁的阻尼有助于减小列车引起的梁的共振响应，但耦合系统的前两个共振峰保持不变。
The objective of this study is to investigate the resonance and sub-resonance acceleration response of a two-span continuous railway bridge under the passage of moving train loadings. The continuous bridge is modeled as a Bernoulli–Euler beam with uniform span length and the moving train is simulated as a series of equidistant two degrees-of-freedom (2-DOF) mass–spring–damper units. The modal superposition method is adopted to compute the interaction dynamics of the train–bridge system. The numerical analyses indicate that (1) the train-induced resonance of the two-span continuous beam may result in significant amplification of the dynamic response of the train/bridge system; (2) for a two-span continuous beam, the first two resonant speeds may fall in the range of operating speeds of high-speed trains, which can lead to highly amplified vehicle responses; (3) due to the presence of sub-resonant peaks, the maximum acceleration of the two-span continuous beam need not occur at the midpoint of the beam; (4) inclusion of damping of a beam is helpful for reducing the train-induced resonant response on the beam, but the first two resonant peaks of the coupling system remain unchanged.