【作者】 狄生奎； 王立宪； 杜永峰； 李慧；

【Author】 Di Sheng-kui,Wang Li-xian,Du yong-feng,Li Hui (School of Civil Engineering,Lanzhou University of Technology,Lanzhou China,730050)

【机构】 兰州理工大学土木工程学院；

【摘要】 针对土木工程结构模态识别中环境温度变化对结构频率的影响,基于模态参数的损伤识别方法,对3根混凝土模型梁在环境温度变化、不同程度结构损伤状况变化下进行振动测试,对结果进行理论和试验模态分析,得到了温度、损伤对于混凝土梁自振频率的影响曲线,混凝土梁频率对于温度变化具有一定的敏感性,对一座混凝土天桥在不同温度下进行实际监测,监测数据理论分析得到频率和模型试验研究结果基本一致,说明温度对于混凝土桥梁的频率具有一定的影响,在目前混凝土桥梁结构检测中必须引起重视。更多还原

【Abstract】 Aimed at considering the influence of ambient temperature on the frequency of civil engineering during modal identification,based on the damage detection method of the modal parameters.3 concrete model beams were tested considering the ambient temperature changing and different damage,the experimental modal were extracted and analysized,the curves of frequency of the beams changing with the ambient temperature and crack were obtained,it is shown that the frequency of concrete beam is sensitive to the environmental temperature,one concrete footbridge was monitored under ambient vibration at different temperatures,the modal frequencies extracted from the monitoring data basically correspond with the experimental results.The temperature has a certain impact on the frequency and should be taken into account during the dynamic test of the concrete bridge.更多还原