摘要
荷载作用下,桥梁挠度测试方法有拉线位移计法、水准仪或全站仪法、光电或激光位移计法、全球定位系统(GPS)法、摄像法以及倾角仪法等,但这些方法在高速铁路列车作用下的高频振动实时动挠度测试方面的研究较少。基于倾角仪测试法,对高频振动下桥梁的实时动挠度测试方法进行研究。室内和现场测试结果表明:该法不仅可以测试梁两端的实时倾角值,而且通过测试桥梁有限部位的实时动倾角,可拟合得到整座桥梁的实时动倾角曲线,通过积分可得到桥梁的实时动挠度曲线,且测试的挠度值不受桥墩下沉及支座变形的影响。该方法可为高铁桥梁健康监测提供可靠的实时动倾角曲线和实时动挠度曲线。
The deflection of railway bridges under dynamic loading have been measured by the cable-displacement sensor,level gauge,electronic total station instrument,photo electric or laser displacement sensor,global positioning system(GPS),range camera,and inclinometer.However,the efficiency and reliability of these methods are seldomly studied in real-time deflection measurements under high-frequency vibration induced by high-speed trains.In this study,the real-time dynamic deflection measurement of bridge under high-frequency vibration is studied based on the inclinometer method.The results of laboratory test and field test show that this methodis feasible to record the deflection of the bridge under the action of high-speed railway by using inclinometer,and the method can not only measure the real-time angle values at the both ends of the bridge,but also obtain the bridge deflection based on the real-time inclination angles measured by inclinometer at limited observation points using integration of the inclination angle curve.The measured deflection of the bridge is not affected by the sinking of the pier and the deformation of the support.The measurement methodcan provide reliable real-time inclination angle curves and dynamic deflection curves ina health monitoring process of high-speed railway bridges.
作者
兰日清
丰彪
匙庆磊
LAN Riqing;FENG Biao;CHI Qinglei(China IPPR International Engineering CO.,LTD.Beijing 100089,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《世界地震工程》
CSCD
北大核心
2020年第1期56-62,共7页
World Earthquake Engineering
基金
国家重点研发计划(2017YFC1500404)
北京市自然科学基金(8172049)
国机集团重大科技专项(SINOMAST-ZDZX-2017-05)
关键词
倾角仪
动挠度
高铁桥梁
高频振动
inclinometer
dynamic deflection
high-speed railway bridge
high-frequency vibration
