（中国铁建投资集团有限公司， 北京 100855）

［摘要］选取在役某系杆拱桥进行动力试验研究，试验主桥跨径布置为(55+260+55)m，采用刚拱柔梁体系，拱肋为主承重结构。在试验桥梁梁端、1/8跨、1/4跨、1/2跨、3/4跨、7/8跨处布置横向和竖向传感器，分别进行了脉动试验和强迫振动试验研究。通过现场试验和试验结果分析，得到了桥梁的自振频率、振型、阻尼比等特性。试验结果表明，试验桥梁自振频率等特性满足要求，不管是脉动试验还是强迫振动试验，桥梁均是安全的。

［关键词］系杆拱桥； 动力试验； 自振频率； 振型； 阻尼比

中图分类号： TU212，TH213.3 文献标识码： A文章编号：  1002-848X(2016)S1-0537-05

Dynamic test study on a tied arch bridge

Wang Hui

 (China Railway Construction Investment Group Co., Ltd., Beijing 100855, China)

Abstract: Dynamic test was done on one tied arch bridge with the span of (55+260+55)m. Steel arch and flexible beam system was adopted and the arch rib is the main load-bearing parts. Pulsating and forced vibration test were carried out of the horizontal and vertical sensors arranged on the span of 1/8, 1/4, 1/2, 3/4, 7/8 and the beam ends. From the field experiments and results analyses, it shows that the natural frequencies, modes, modal damping ratio and other characteristics were obtained. The results indicate that the natural vibration characteristics meet the requirements. Whether it is forced or pulsating vibration, the bridge is safe.

Keywords: tied arch bridge; dynamic test; natural frequency; mode; modal damping ratio

作者简介： 王辉，硕士，工程师，Email：huiwang_b@163.com。