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首页> 外文会议>Asia-Pacific Conference on Shock amp; Impact Loads on Structures; 20031112-14; Changsha, Hunan,(CN) >TRAIN-INDUCED CYCLIC LOADS IN AN ELASTIC HALF-SPACE
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TRAIN-INDUCED CYCLIC LOADS IN AN ELASTIC HALF-SPACE

机译：弹性半空间中的列车引起的循环荷载

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摘要

To study the train-induced cyclic loads in the elastic half-space, the train-track system-ground interaction problem is simplified as Timoshenko beam on elastic foundation under a series of moving concentrating loads. The dynamic loads on the foundation surface are calculated with the corresponding pseudo-static solution. Ground response is obtained by integrating the basic solution of stresses in elastic half-space under moving point force. Variation of dynamic stresses with space and time coordinate is studied. It is shown that the dynamic stresses in the ground are harmonic-like cyclic loads. They attenuate rapidly with depth but decrease more slowly in the y direction at a deeper depth. Speed has a significant influence on stresses, which differs for different stress components and depends on the speed ratio. Of all the normal stress σ zd is the dominant one, whose influencing range and magnitude are much larger than those of the other two.
机译：为了研究列车在弹性半空间中的周期性载荷，列车-轨道系统-地面相互作用问题被简化为在一系列移动集中载荷下弹性基础上的Timoshenko梁。用相应的拟静力解决方案计算基础表面上的动态载荷。地面响应是通过积分移动点力作用下弹性半空间中应力的基本解而获得的。研究了动态应力随空间和时间坐标的变化。结果表明，地下的动应力是类似谐波的周期性载荷。它们随着深度迅速衰减，但在更深的深度沿y方向减小得更慢。速度对应力有重大影响，应力因应力分量而异，并且取决于速度比。在所有法向应力中，σzd是主要应力，其影响范围和大小远大于其他两个。

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