平均应力和动载应力振幅同时改变时，对动态响应影响最大；
When shifting both the mean stress and the dynamic stress amplitude, the influence on dynamic response is the most intensive.
在多冲这种动载应力波作用下的零部件大都在多冲的接触表面出现或引发各种缺陷并导致早期损伤失效。
All kinds of defects appear in the surface of components which under the repeated impact load, and the surface defects make the earlier damage and failure.
文章以一座单塔单索面竖琴式预应力混凝土桥为例，详述了静动载试验的原理、方法、过程、测试项目、试验工况等。
Taking the single pylon single cable plane pre-stressed concrete cable-stayed bridge as example, the paper discusses the principle, methods, testing items, and experiment conditions, etc.
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