【Key words】 Piers with middle and low heights; Frequency identification; Impact vibration test method; Bridge diagnosis and evaluation
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An impact vibration test method (IVTM) for measuring natural frequencies of existing piers is proposed in this paper.
提出了一种测量既有桥墩自振频率的新方法，即冲击振动试验法(IVTM)。
The first-order mode and the first eigenfrequency of the pier can be obtained easily and precisely by the impact vibration test method, from which three indexes such as the chang.
利用冲击振动试验法可以准确得到桥墩的一阶振型和一阶频率，利用这两个参数可以构造出一阶振型比、特征参数、一阶曲率模态差三个指标。
Environmental testing for electric and electronic products. Part 2: test method. Mounting of specimens for vibration, impact and similar dynamic tests.
电工电子产品环境试验。第2部分：试验方法。振动、冲击和类似动力学试验样品的安装。
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