本文用FE3C 8500程序计算了渗碳体的结构振幅，据此，说明了渗碳体的结构消光条件。

The structure amplitudes of Fe_3C are calculated by using the program FE3C8500, then the condition of structure extinction is introduced in this paper.

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尽管涡振是一种限幅振动，但由于其发生风速较低，振幅相对较大，会影响结构的强度和疲劳，因此大跨度拱桥的涡振响应研究具有重要的意义。

Vortex-induced vibration is limited amplitude response, but it occurs at low wind speed with relative large amplitude, which will affect the strength and fatigue resistance of the structure.

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最后，给定结构的损害取决于震动的振幅和持续时间。

Finally, the damage to a given structure will depend both on the amplitude of the shaking and its duration.

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