既有桥梁墩台自振频率测试的冲击振动试验法

An Impact Vibration Test Method for Measuring Natural Frequencies of Existing Piers

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).该方法是用重锤击打桥墩,测量桥墩顶部的响应并对其进行傅立叶解析,通过比较响应的幅值谱和相位谱来确定桥墩的自振频率.试验时可仅在墩顶布置一个传感器,因而试验相对较简单,试验费用较低,可以用来方便准确地对大量桥墩进行测试.

An impact vibration test method (FVTM) for measuring natural frequencies of existing piers is proposed in this paper. In this method, an impact is applied to the test pier, the response of the top of the pier is measured, and its natural frequency can be determined based on the comparison of amplitude spectrum and phase properties which are obtained through the application of Fourier analysis to the response. Under most cases, only one sensor is needed and placed on the top of the test pier, so the test is comparatively easy and inexpensive and can be conveniently and precisely executed on numerous existing piers.