Vision-based rapid impact testing and identification of footbridge
The rapid impact testing of bridges contains unique advantages.For example,structural parameters including Frequency Response Function(FRF)and structural flexibility matrix can be identified,however,additional impact testing instruments are required in order to excite a bridge,restricting the efficiency of a measurement strategy.In this paper,a computer vision-based method was proposed for the rapid impact testing and structural system identification of footbridges with pedestrian excitations.The proposed method has shown promising features:(1)pedestrian loads are utilized for the impact excitation of footbridges,which is more appropriate than the conventional methods owing to its noncontact and targetless characteristics;(2)the human-induced impact forces under varying jumping scenarios are calculated from image sequences of human body motions acquired by a single camera;(3)both human-induced impact forces(inputs)and structural responses(outputs)are employed to identify structural parameters(i.e.,scaling factors of mode shapes and structural flexibility).The efficiency of the proposed method was successfully verified by a laboratory test performed on a simply supported beam and a real model of a cable-stayed footbridge.The proposed method not only could improve the testing efficiency of footbridges,but also could obtain more meaningful parameters,which can be further utilized for deflection prediction,damage detection,and long-term performance evaluation.
Vision-based Measurement Rapid Impact Testing Footbridge Structural Flexibility Identification
Y.D.Tian J.Zhang
School of civil engineering,Southeast University,Nanjing,210096,China School of civil engineering,Southeast University,Nanjing,210096,China;Professor,Jiangsu Key Laborato
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
2814-2823
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）