Research on moving load identification based on measured acceleration and strain signals

2019 ◽  
Vol 3 (3/4) ◽  
pp. 257-288 ◽  
Author(s):  
Yun Zhou ◽  
Sai Zhou ◽  
Lu Deng ◽  
Songbai Chen ◽  
Weijian Yi
Keyword(s):  
Moving Load ◽  
Load Identification ◽  
Moving Load Identification

Moving Load Identification of Small and Medium-Sized Bridges Based on Distributed Optical Fiber Sensing

2016 ◽  
Vol 16 (04) ◽  
pp. 1640021 ◽  
Author(s):  
Cai Qian Yang ◽  
Dan Yang ◽  
Yi He ◽  
Zhi Shen Wu ◽  
Ye Fei Xia ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Moving Load ◽  
Vehicle Speed ◽  
Load Identification ◽  
Structure Response ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Fbg Sensors ◽  
Distributed Optical Fiber ◽  
Moving Load Identification

A novel method was proposed for the moving load identification of bridges based on the influence line theory and distributed optical fiber sensing technique. The method of load and vehicle speed identification was firstly theoretically studied, and then numerical simulation was also performed to study its accuracy and robustness. The numerical results showed that this method was characterized by high accuracy and excellent resistance to noise. Finally, the load identification of an actual continuous pre-stressed concrete beam bridge was carried out with the proposed method. The bridge consists of four pre-stressed box beams. At the same time, a weigh-in-motion system was also installed about 200 m in front of the bridge to measure the speed and moving loads with a purpose of comparing the load identification of the proposed method. Long gauge fiber Bragg grating (FBG) sensors with a gauge length of 1.0 m were adhered to the bottom of the beams. The individual loaded vehicles and the corresponding structure response were mainly monitored as standard samples, and the speed and weight of the sample vehicles were monitored and identified with the proposed method. The results revealed that the distributed long gauge FBG sensors were capable of sensing the structure response precisely and identifying the traffic load. On the basis of the design information and ambient vibration testing results, a refined model was established and the response under unit moving load was acquired for load identification. It was also shown that the sensors in different positions can achieve accurate vehicle speed and weight, the relative error of which are within 10% and 15%, respectively.

scholarly journals Moving Load Identification with Long Gauge Fiber Optic Strain Sensing

2021 ◽  
Vol 16 (3) ◽  
pp. 131-158
Author(s):  
Qingqing Zhang ◽  
Wenju Zhao ◽  
Jian Zhang
Keyword(s):  
Fiber Optic ◽  
Moving Load ◽  
Field Testing ◽  
Maximum Strain ◽  
Load Identification ◽  
Moving Vehicle ◽  
Moving Vehicles ◽  
Structural Responses ◽  
Vehicle Loads ◽  
Moving Load Identification

Moving load identification has been researched with regard to the analysis of structural responses, taking into consideration that the structural responses would be affected by the axle parameters, which in its turn would complicate obtaining the values of moving vehicle loads. In this research, a method that identifies the loads of moving vehicles using the modified maximum strain value considering the long-gauge fiber optic strain responses is proposed. The method is based on the assumption that the modified maximum strain value caused only by the axle loads may be easily used to identify the load of moving vehicles by eliminating the influence of these axle parameters from the peak value, which is not limited to a specific type of bridges and can be applied in conditions, where there are multiple moving vehicles on the bridge. Numerical simulations demonstrate that the gross vehicle weights (GVWs) and axle weights are estimated with high accuracy under complex vehicle loads. The effectiveness of the proposed method was verified through field testing of a continuous girder bridge. The identified axle weights and gross vehicle weights are comparable with the static measurements obtained by the static weighing.

Influences of Elastic Supports on Moving Load Identification of Euler–Bernoulli Beams Using Angular Velocity

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Guandong Qiao ◽  
Salam Rahmatalla
Keyword(s):  
Angular Velocity ◽  
Moving Load ◽  
Load Identification ◽  
Moving Loads ◽  
Elastic Supports ◽  
Wide Range ◽  
Angular Velocities ◽  
Ill Posed ◽  
Translational Spring ◽  
Moving Load Identification

Abstract This work investigates the effect of elastic support stiffness on the accuracy of moving load identification of Euler–Bernoulli beams. It uses the angular velocity response in solving the ill-posed inverse vibration problem and Tikhonov regularization in the load identification process of two moving loads. The effects from moving loads’ traveling direction, measurement location arrangements, number of participant measurements, and damping ratios are considered in the studies under noisy disturbance conditions. Results show that the stiffness of the translational rotational springs at the boundaries can impact the accuracy of identified moving loads considerably. Angular velocities presented much better results than accelerations under low stiffness conditions when vertical elastic supports were used. However, acceleration showed better performance when a very soft translational spring was used at one end and a much stiffer translational spring at the other end, as well as when rotational springs with large stiffness were used with simply supported beam conditions. The combination of angular velocities and accelerations provided a balanced solution for a wide range of elastic supports with different stiffnesses.

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