用锤击法和变时基技术进行黄河铁路桥的模态试验分析

介绍了用力锤激励铁路运动实际桥梁模态分析的特别试验。试验采用了新技术，一、弹性聚能力锤延长了力的激励时间，使激励力的能量聚集在低频处；二、使用了变时基（Ｖａｒｉｅｄ－Ｔｉｍｅ－Ｂａｓｅ）传递函数模态分析方法，极大提高了大型结构的传递函数的分析精度，从而使锤击法进行大型土木结构的模态试验成为可能。本文是国内外首次利用锤击激励进行的铁路运行实际桥梁模态分析的成功试验，具有一定的科研和应用价值。

Modal Test for Yellow River Bridge Exciting with Hammer

This paper introduces a special test, using energy-accumulating elastic hammer to excite great railway bridge for modal analysis. The energy-accumulating elastic hammer designed by COINV extends the lasting time of exciting force, gathers the exciting energy into the low frequency district and makes it possible to test large civil structure with hammer exciting. For improving the precise result of large structure transfer function, a new analyzing method named Varied-Time-Base was used. This is the first time to use hammer as exciting equipment for bridge modal test in China.