珠江黄埔大桥模态频率连续监测中的温度影响Ⅰ:频率识别  

Temperature Influence in Modal Frequency Continuous Monitoring of the Zhujiang Huangpu Suspension Bridge I:Frequency Identification

作　　者：朱嘉健 王立新[1,2,3] 姜慧[1,2,3] 赵贤任[1,2,3] 李雪艳[4] 

机构地区：[1]广东省地震局,广州510070 [2]中国地震局地震监测与减灾技术重点实验室,广州510070 [3]广东省地震预警与重大工程安全诊断重点实验室,广州510070 [4]暨南大学力学与土木工程系,广州510632

出　　处：《震灾防御技术》2016年第1期67-75,共9页Technology for Earthquake Disaster Prevention

基　　金：广东省重大科技专项(2012A080102008);地震科技星火计划(XH16031);国家自然科学青年基金(51208230);广东省地震预警与重大工程安全诊断重点实验室建设项目(2011A060901006)

摘　　要：为研究环境温度对珠江黄埔大桥频率监测的影响,首先要对大桥模态频率进行连续识别。珠江黄埔大桥上架设的监测系统为强震动台阵,相较于其他健康监测系统测点较少,因此,应基于强震动台阵系统的特点,选取合适的方法对大桥频率进行识别。本文通过对比分析平均正则化功率谱法(ANPSD)、频域分解法(FDD)和协方差驱动的随机子空间法(Cov-SSI)的识别结果,择优应用于珠江黄埔大桥的频率自动识别中。采用珠江黄埔大桥强震动台阵记录的2013年4月至11月加速度响应数据进行频率识别,识别结果可用于观测和研究大桥频率在环境影响下的波动情况。In order to study temperature influence in modal frequency monitoring of the Zhujiang Huangpu bridge, modal frequencies should be identified continuously from the monitoring data firstly. Compared with other monitoring systems, the strong motion monitoring system set up on the Huangpu bridge has less measuring points. Therefore, appropriate approaches should be chosen for frequency identification with taking account of the characteristics of strong motion monitoring system. In this paper, the suitable method was selected and determined by comparing the identified results obtained by ANPSD, FDD and Cov-SSI methods. Then the frequencies of the Huangpu Bridge were identified based on the acceleration data recorded from April to November in 2013. The identified results provide data to observe and study the variation of modal frequencies of the bridge.

关 键 词：环境振动 结构健康监测 珠江黄埔大桥 模态频率识别 频率变化 

分 类 号：U446[建筑科学—桥梁与隧道工程]