Identification of the moving train loads on the railway bridge based on monitoring strain data
The moving train loads(MTLs)evolutionary parameters are important for the performance evaluation of the railway bridges,including the gross train weight,axle spacing,axle weights and train speed.Based on the recorded strain data,MTLs acting on a continuous steel truss railway bridge are identified in this work.According to the influence line theory,the integral area of the structural strain response,which is induced by unit force with the unit speed,is a constant.Hence,the gross train weight can be obtained in accordance with the integral area of strain responses.Meanwhile,a series of pulses,indicating the moments when the axles move through the fixed points,can be observed from the second derivative values of the structural strain responses.Then,the axle weights can be identified using the peaks of the second derivative values of the strain responses.The parameters of MTLs,including the gross train weight,axle spacing,axle weights and train speed,can be further obtained.The method is verified using the real-time strain data of a continuous steel truss railway bridge.Results show that the train speed,axle spacing and gross train weight,can be accurately identified in the time domain.However,only the approximate values of the axle weights could be obtained with the proposed method.
railway bridges strain data moving train loads (MTLs) identification influence line
Qingxin Zhu Hao Wang Jianxiao Mao Yuqi Gao Suoting Hu Xinxin Zhao
Key Laboratory of C&PC Structures of Ministry of Education,Southeast University,Nanjing,China Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
2723-2732
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）