激振频谱检测系统在既有线桥梁墩身健全度评估中的应用  

Application of Excitation Spectrum Detection System to Pier Integrity Evaluation of Existing Railway Bridges

作　　者：王敬[1] 李肖军 王西冲 WANG Jing LI Xiao-jun WANG Xi-chong(Shuohuang Railway Development Co., Ltd., Cangzhou 062350, China Chengdu Changdatong Inspection Technology Co., Ltd., Chengdu 610041, China)

机构地区：[1]朔黄铁路发展有限责任公司,河北沧州062350 [2]成都畅达通检测技术股份有限公司,四川成都610041

出　　处：《世界桥梁》2017年第3期84-88,共5页World Bridges

摘　　要：针对国内目前测试方法不易准确识别铁路桥中低高度墩身自振频率值,同时《铁路桥梁检定规范》对低墩横向自振频率值未作相应要求等现状,引入国外桥墩健全度评估理念,介绍基于激振频谱检测系统测试墩身自振频率的方法。该方法是在墩顶布置加速度传感器,采用重锤打击桥墩顶部,通过采集桥墩顶部的响应信号并对其进行傅立叶解析,即可根据解析出的幅值谱和相位谱双重标准确定桥墩自振频率。以朔黄铁路既有病害桥梁为例,采用该方法对该桥低墩健全度进行了快速评估,根据评估结果对不健全桥墩提出了加固建议,并在加固后对其进行了测试,验证了评估结果的准确性及有效性。The current inspection methods in China cannot easily identify the natural vibration frequencies of pier shafts with different heights in the railway bridges, and the Specifications for Railway Bridge Inspection does not stipulate the transverse natural vibration frequencies for low piers. In such cases, the concept of bridge pier integrity evaluation used in other countries is intro-duced and the natural vibration frequency inspection method to pier shaft based on excitation spec-trum detection system is presented. Accelerometers were installed on the pier tops, the pier tops were hit by heavy hammers, and the signals yielded were collected and analyzed by Fourier analysis to determine the natural vibration frequencies of the piers based on double standards of the Fourier amplitude spectrum and the phase spectrum. The bridges with deteriorations on the Shuohuang Railway were cited as examples, to which the method was used to carry out a rapid evaluation of the integrity of the low piers. According to the results, the strengthening advices to the unhealthy piers were given. The piers were tested after the strengthening, to verify the correctness and effec-tiveness of the evaluating results.

关 键 词：铁路桥 桥墩 激振频谱检测系统 横向自振频率 桥墩健全度 评估 

分 类 号：U446[建筑科学—桥梁与隧道工程]