scholarly journals Cable force estimation of a long‐span cable‐stayed bridge with microwave interferometric radar

2020 ◽  
Vol 35 (12) ◽  
pp. 1419-1433 ◽  
Author(s):  
Wenju Zhao ◽  
Guangwei Zhang ◽  
Jian Zhang
Keyword(s):  
Force Estimation ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Cable Force ◽  
Cable Force Estimation

scholarly journals Experimental Verification for Cable Force Estimation Using Handheld Shooting of Smartphones

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Xuefeng Zhao ◽  
Kwang Ri ◽  
Niannian Wang
Keyword(s):  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Force Measurement ◽  
Moving Average ◽  
Rapid Development ◽  
Practical Significance ◽  
Force Estimation ◽  
Cable Stayed Bridge ◽  
Cable Force ◽  
Cable Force Estimation

Currently, due to the rapid development and popularization of smartphones, the usage of ubiquitous smartphones has attracted growing interest in the field of structural health monitoring (SHM). The portable and rapid cable force measurement for cable-supported structures, such as a cable-stayed bridge and a suspension bridge, has an important and practical significance in the evaluation of initial damage and the recovery of transportation networks. The extraction of dynamic characteristics (natural frequencies) of cable is considered as an essential issue in the cable force estimation. Therefore, in this study, a vision-based approach is proposed for identifying the natural frequencies of cable using handheld shooting of smartphone camera. The boundary of cable is selected as a target to be tracked in the region of interest (ROI) of video image sequence captured by smartphone camera, and the dynamic characteristics of cable are identified according to its dynamic displacement responses in frequency domain. The moving average is adopted to eliminate the noise associated with the shaking of smartphone camera during measurement. A laboratory scale cable model test and a pedestrian cable-stayed bridge test are carried out to evaluate the proposed approach. The results demonstrate the feasibility of using smartphone camera for cable force estimation.

Analysis of Parameters' Sensitiveness of Long-Span Hybrid Girder Cable-Stayed Bridge

2012 ◽  
Vol 517 ◽  
pp. 817-823
Author(s):  
Zhong San Li ◽  
Jun Qing Lei ◽  
Dong Huang Yan
Keyword(s):  
Tensile Force ◽  
Design Parameters ◽  
Highway Bridge ◽  
Construction Control ◽  
Test Results ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Control Precision ◽  
Good State ◽  
Cable Force

In order to improve the construction control precision of long-span hybrid girder cable-stayed bridge, the design parameters such as the weight of girder, the cable tensile force and the stiffness of cable are conducted sensitivity analysis through computing and comparing the influences of these parameters on the deflection of girders, the stress of girders and the cable force in the bridge's completion state. It was shown by the computation results that the main parameters of long-span hybrid girder cable-stayed bridge are the weight of girder and the cable tensile force, the stiffness of cable has a little influence on the completion state of the bridge. With this approach, through modifying the main parameters, while ignoring the influences of the secondary ones, the Jingyue Yangtze River Highway Bridge construction control has been successfully done. The test results show that the cable force and the contour of the bridge are in good state. They are both in the range of control, the relative error of the cable force is less than 3% and the elevation deviation is less than 5mm.

scholarly journals Cable force estimation of cables with small sag considering inclination angle effect

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Wen-Yu He ◽  
Fan-Cheng Meng ◽  
Wei-Xin Ren
Keyword(s):  
Boundary Conditions ◽  
Inclination Angle ◽  
Estimation Methods ◽  
Unknown Boundary ◽  
Force Estimation ◽  
Numerical Examples ◽  
Cable Force ◽  
Angle Effect ◽  
Unknown Boundary Conditions ◽  
Cable Force Estimation

AbstractCable force estimation is essential for security assessment of cable-stayed bridges. Cable force estimation methods based on the relationship between cable force and frequency have been extensively studied and used during both construction phase and service phase. However, the effect induced by inclination angle of the cable is not included in the establishment of frequency-cable force relationship as horizontal cable model is normally employed. This study aims to investigate the influence of the inclination angle on vibration based cable force estimation and provide practical formulas accordingly. Firstly numerical examples of fixed-fixed and hinged-hinged cables are simulated to illustrate the necessity of considering the inclination angle effect on the modal parameters and cable force estimation for inclined cables with small sag. Then practical formulas considering the inclination angle effect to estimate the cable force of fixed-fixed and hinged-hinged cables via the fundamental frequency are established accordingly. For the inclined cables with unknown boundary conditions, the coefficients reflecting boundary condition are predicted via the practical formulas for fixed-fixed and hinged-hinged cables. And the cable force considering the influence of inclination angle and unknown boundary conditions is obtained by iteration method. Finally, numerical examples are presented to demonstrate the effectiveness of the proposed method.

Noncontact cable force estimation with unmanned aerial vehicle and computer vision

2020 ◽  
Vol 36 (1) ◽  
pp. 73-88 ◽  
Author(s):  
Yongding Tian ◽  
Cheng Zhang ◽  
Shang Jiang ◽  
Jian Zhang ◽  
Wenhui Duan
Keyword(s):  
Computer Vision ◽  
Unmanned Aerial Vehicle ◽  
Force Estimation ◽  
Cable Force ◽  
Aerial Vehicle ◽  
Cable Force Estimation

Estimation and Optimization of Cable Force in Completion State of Cable-Stayed Bridge

2015 ◽  
Vol 744-746 ◽  
pp. 763-766
Author(s):  
Xun Wu ◽  
Bao Lei Li
Keyword(s):  
Internal Force ◽  
Continuous Beam ◽  
Force Estimation ◽  
Displacement Method ◽  
Cable Stayed Bridge ◽  
Completion Status ◽  
Analysis Calculation ◽  
Key Factor ◽  
Cable Force ◽  
Rigid Supports

The reasonable cable force is the key factor for the safe use of cable-stayed bridge. This paper adopts the method of continuous beam on rigid supports, zero displacement method and the internal force balanced method for cable force estimation of completion stage. The estimation value of cable force is determined by comprehensive considering various methods. With the estimate value as the initial cable force of feasible domain method, conducting the cable force optimization. Comparing the optimization with estimation value and conducting analysis calculation to ensure the rational completion status. Referring a cable-stayed bridge’s example, and conducting the estimation and optimization of cable force, the calculated results meet the requirements. The results show that the method is effective and practical.

scholarly journals Numerical Analysis of Long-Span Cable-Stayed Bridge in the Construction Phase

2015 ◽  
Vol 9 (1) ◽  
pp. 896-905 ◽  
Author(s):  
Xue Chengfeng ◽  
Liu Laijun ◽  
Wu Fangwen ◽  
Yang Caofang
Keyword(s):  
Parametric Design ◽  
Tension Stress ◽  
Construction Stage ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Fea Model ◽  
Temperature Method ◽  
Cable Force ◽  
Sutong Bridge ◽  
Stage Analysis

The fabrication and erection of cable-stayed bridges involve major changes in structure configuration through the addition and removal of structure components. In every stage of the construction process, adequate information on the constructed structure is important to determine the real structure situation for the analysis of errors and to verify construction requirements. The ultimate goals are to meet construction needs and identify the effects of modification in subsequent construction procedures. The final configuration of the structure is strongly dependent on the construction and fabrication procedures. In this regard, developing an FEA model to simulate the actual construction processes is necessary to determine the performance of a bridge under external loads. In this study, a general methodology for construction processes is presented to simulate a cable-stayed bridge. The stage-by-stage construction of the Sutong Bridge is simulated with ANSYS software package. The tensions of cables are realized with ANSYS parametric design language, element birth and death function, and mutliframe restart function. The objective of the construction stage simulation is to identify stresses and deformations of the steel box girder and the concrete towers, as well as the cable tension stress, to meet the design requirements. Results of the construction stage analysis showed that the temperature method could simulate the adjustment of the inclined cable force successfully, and the global stiffness of the Sutong Bridge was very small before closure. These findings served as the initial data for a dynamic research on the Sutong cable-stayed bridge.

scholarly journals Model Order Identification for Cable Force Estimation Using a Markov Chain Monte Carlo-Based Bayesian Approach

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4187 ◽  
Author(s):  
Shaodong Zhan ◽  
Zhi Li ◽  
Jianmin Hu ◽  
Yiping Liang ◽  
Guanglie Zhang
Keyword(s):  
Monte Carlo ◽  
Markov Chain ◽  
Flexural Rigidity ◽  
Tensile Force ◽  
Suspension Bridge ◽  
Force Estimation ◽  
Model Order ◽  
Measured Frequency ◽  
Cable Force ◽  
Cable Force Estimation

The tensile force on the hanger cables of a suspension bridge is an important indicator of the structural health of the bridge. Tensile force estimation methods based on the measured frequency of the hanger cable have been widely used. These methods empirically pre-determinate the corresponding model order of the measured frequency. However, because of the uncertain flexural rigidity, this empirical order determination method not only plays a limited role in high-order frequencies, but also hinders the online cable force estimation. Therefore, we propose a new method to automatically identify the corresponding model order of the measured frequency, which is based on a Markov chain Monte Carlo (MCMC)-based Bayesian approach. It solves the limitation of empirical determination in the case of large flexural rigidity. The tensile force and the flexural rigidity of cables can be calculated simultaneously using the proposed method. The feasibility of the proposed method is validated via a numerical study involving a finite element model that considers the flexural rigidity and via field application to a suspension bridge.

Structure-borne noise from long-span steel truss cable-stayed bridge under damping pad floating slab: Experimental and numerical analysis

2020 ◽  
Vol 157 ◽  
pp. 106988 ◽  
Author(s):  
Lin Liang ◽  
XiaoZhen Li ◽  
Jing Zheng ◽  
KangNing Lei ◽  
Hongye Gou
Keyword(s):  
Numerical Analysis ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Steel Truss
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