Correction Method of Cable Tension Measurement Bases on the Principle of Hamilton

2014 ◽  
Vol 1079-1080 ◽  
pp. 342-347
Author(s):  
Lei Jin ◽  
Zhen Dong Qian ◽  
Xiu Yong Wang
Keyword(s):  
Correction Method ◽  
Tension Test ◽  
Damping Coefficient ◽  
Stay Cable ◽  
Cable Tension ◽  
Measured Frequency ◽  
Rubber Damper ◽  
Measurement Bases

In order to improve the accuracy of cable tension test, the motionequation of the stay cable with the rubber damper was established bases on the principleof Hamilton. First, the correction method for the damping coefficient of rubberdamper and cable tension was proposed according to the higher modal frequencyand measured frequency of cables difference. Then, take the cable of DongtingLake Bridge as an example, the cable tension was calculated by the proposedmethod and compared with the results of measurement by frequency method.Results showed that the proposed method can improve the accuracy of cabletension test and can effectively evaluate the cable tension condition of thecable-stayed bridge.

Optimal Design of Damper with Stiffness for Damping of Stay Cable under Bridge Deck Motion

2013 ◽  
Vol 438-439 ◽  
pp. 769-774
Author(s):  
Shuai Luo ◽  
Quan Sheng Yan ◽  
Hong Jun Liu
Keyword(s):  
Optimal Design ◽  
Bridge Deck ◽  
Damping Coefficient ◽  
Viscous Damper ◽  
Stay Cable ◽  
Rule Of Thumb ◽  
Modal Damping ◽  
Inclined Angle

This paper studies cable-damper mitigation model due to indirect excitation caused by bridge deck vibration. In the new mitigation model, as a rule of thumb, we considered a parallel association of idealize damper with a spring to simulate the inherent stiffness of the damper. The result shows that the interaction between the stiffness of the viscous damper could deeply impact the damper effectiveness, and the external damping should be increased deeply to provide the same non-dimensional modal damping when the inclined angle of cable decreases. The optimum damping coefficient of the non-idealized damper decreases when the stiffness of the damper increases.

Sensitivity Analysis of Cable Parameters on Tension of a Suspended Cable under Combination Resonances

2019 ◽  
Vol 19 (03) ◽  
pp. 1950025 ◽  
Author(s):  
Kyu Won Kim ◽  
No-Cheol Park ◽  
Weon Keun Song ◽  
Moon Kyum Kim ◽  
Manukid Parnichkun
Keyword(s):  
Sensitivity Analysis ◽  
Time Domain ◽  
Damping Coefficient ◽  
Sensitivity Analyses ◽  
Phase Portraits ◽  
Arc Length ◽  
Cable Tension ◽  
Suspended Cable ◽  
Direct Integration Method ◽  
The Time Domain

This paper studies the vibration of a suspended cable with small sag excited by a second excitation (normal) mode causing combination resonance in the three modes, i.e. tangent, normal and bi-normal modes. The displacement response spectra in the time domain and phase portraits are provided as evidence of the transition from the unstable steady-state motion to the stable one for nonlinear cable oscillation. A nondimensional equation for the cable tension is established with its variation evaluated for the unstable zone. The half-normalized sensitivity analysis of cable parameters, such as damping coefficient, excitation amplitude, arc length parameter and initial conditions, for their influence on cable tension is conducted in the time domain by a direct integration method. Also, the characteristics of the dynamic sensitivity of cable tension to the parameters are discussed. As a result, a sensitivity ranking chart is prepared based on the sensitivity analyses for the parameters considered. It is clearly revealed that cable tension is very sensitive to tangent and normal initial displacements in spite of their small values, whereas the same is not true for the arc length parameter and bi-normal damping coefficient. To verify the sensitivity analysis algorithm, a forced Rayleigh oscillator is introduced. A feasibility study using the oscillator shows that the numerical results obtained are in good qualitative agreement with the analytical predictions, implying that the associated algorithm works well.

Damping of Stay Cable-Passive Damper System with Effects of Cable Bending Stiffness and Damper Stiffness

2012 ◽  
Vol 204-208 ◽  
pp. 4513-4517 ◽  
Author(s):  
Min Liu ◽  
Guang Qiao Zhang
Keyword(s):  
Numerical Analysis ◽  
Damping Ratio ◽  
Bending Stiffness ◽  
Damping Coefficient ◽  
Stay Cable ◽  
Modal Damping Ratio ◽  
Passive Damper ◽  
Modal Damping ◽  
Optimal Damping ◽  
Coefficient Increase

In the present paper, the asymptotic solution of modal damping ratio of stay cable-passive damper system with the influence of cable bending stiffness and damper stiffness was derived. Maximum modal damping ratio and corresponding optimal damping coefficient, which indicated the relationships of the characteristics of the damper and the cable bending stiffness was theoretically analyzed to obtain their close solutions. On the basis of these close solutions, numerical analysis of modal damping of stay cable-passive damper system with the effects of cable bending stiffness and damper stiffness was conducted. The numerical and analytical results show that the maximum modal damping ratio decrease and the corresponding damping coefficient increase, when considering the influence of the damper stiffness and the cable bending stiffness.

Stay Cable Tension Estimation of Cable-Stayed Bridges Using Genetic Algorithm and Particle Swarm Optimization

2017 ◽  
Vol 22 (10) ◽  
pp. 05017008 ◽  
Author(s):  
Seyed Ehsan Haji Agha Mohammad Zarbaf ◽  
Mehdi Norouzi ◽  
Randall J. Allemang ◽  
Victor J. Hunt ◽  
Arthur Helmicki
Keyword(s):  
Genetic Algorithm ◽  
Particle Swarm Optimization ◽  
Particle Swarm ◽  
Stay Cable ◽  
Swarm Optimization ◽  
Cable Tension ◽  
Cable Stayed Bridges

Automated wireless monitoring system for cable tension forces using deep learning

2020 ◽  
pp. 147592172093583
Author(s):  
Seunghoo Jeong ◽  
Hyunjun Kim ◽  
Junhwa Lee ◽  
Sung-Han Sim
Keyword(s):  
Deep Learning ◽  
Monitoring System ◽  
Structural Integrity ◽  
Estimation Method ◽  
Smart Sensors ◽  
Peak Picking ◽  
Stay Cable ◽  
Cable Tension ◽  
Cable Vibration ◽  
Wireless Smart Sensors

As demand for long-span bridges is increasing worldwide, effective maintenance has become a critical issue to maintain their structural integrity and prolong their lifetime. Given that a stay-cable is the principal load-carrying component in cable-stayed bridges, monitoring tension forces in stay-cables provides critical data regarding the structural condition of bridges. Indeed, various methodologies have been proposed to measure cable tension forces, including the magneto-elastic effect-based sensor technique, direct measurement using load cells, and indirect tension estimation based on cable vibration. In particular, vibration-based tension estimation has been widely applied to systems for tension monitoring and is known as a cost-effective approach. However, full automation under different cable tension forces has not been reported in the literature thus far. This study proposes an automated cable tension monitoring system using deep learning and wireless smart sensors that enables tension forces to be estimated. A fully automated peak-picking algorithm tailored to cable vibration is developed using a region-based convolution neural network to apply the vibration-based tension estimation method to automated cable tension monitoring. The developed system features embedded processing on wireless smart sensors, which includes data acquisition, power spectral density calculation, peak-picking, post-processing for peak-selection, and tension estimation. A series of laboratory and field tests are conducted on a cable to validate the performance of the proposed automated monitoring system.

Method of Bending Stiffness Parameter Identification of Stay Cable

2015 ◽  
Vol 777 ◽  
pp. 52-58
Author(s):  
Hong Du ◽  
Da Yang Liu ◽  
Fu Wei Huang ◽  
Jing Bo Liao
Keyword(s):  
Parameter Identification ◽  
Bending Stiffness ◽  
Parameters Identification ◽  
Stiffness Ratio ◽  
Stiffness Parameter ◽  
Stay Cable ◽  
Cable Tension ◽  
Cable Length

In order to solve the problem of bending stiffness parameters identification of practical stay-cable, and provide bending stiffness correction for tension measurement. A method to identify cable bending stiffness parameters is proposed, and its basis theory established in paper. The method was applied to Xiazhang Sea-Crossing Bridge, the results showed that: Identification bending stiffness ratio is between 0.33 to 0.54 for relatively short cables of South Branch Bridge, and it tends to decrease with increase of cable length and force. However, the identification bending stiffness is close or equal to 0 EImax for relatively long cable of North Branch Bridge. It testified that the effect of bending stiffness for long cable tension is small in engineering.

The Relevance Research on Tension Test Technology of Cable and Suspender

2011 ◽  
Vol 243-249 ◽  
pp. 1727-1730
Author(s):  
Wei He ◽  
Rong He ◽  
Heng Xiang Zheng
Keyword(s):  
Numerical Analysis ◽  
Environmental Factors ◽  
Boundary Conditions ◽  
Curve Fitting ◽  
Tension Test ◽  
Elastic Support ◽  
Cable Tension ◽  
Equivalent Length ◽  
Test Technology ◽  
Testing Techniques

The problem and relevance research of tension test technology of cable and suspender was introduced from the influence of environmental factors, cable stiffness identification, equivalent length, sag, slope, testing techniques improvement, numerical analysis with curve fitting, and boundary conditions of elastic support. And according to the actual needs of tension measurement in engineering the researches on cable tension measurement maybe highlight were prospected.

Measuring Methods of Cable Tension in Cable-Stayed Bridges

2011 ◽  
Vol 295-297 ◽  
pp. 1230-1235
Author(s):  
Jiang Bo Sun ◽  
Zuo Zhou Zhao ◽  
Hong Hua Zhao
Keyword(s):  
Natural Vibration ◽  
String Model ◽  
Beam Model ◽  
Stay Cable ◽  
Fem Model ◽  
Cable Tension ◽  
Cable Stayed Bridge ◽  
Stay Cables ◽  
Beam Bending ◽  
Cable Stayed Bridges

This paper presents several methods usually used for measuring cable tension in cable-stayed bridges, especially frequency vibration method. Taken two different length stay-cables under given tension forces in a real cable-stayed bridge as an example, different modeling methods in finite element methods (FEM) were used to solve their natural vibration frequencies. The results by FEM were compared with those from other available theoretical predicting method. It was found that FEM based on tightening string model is more suitable for a long stay-cable. For a short stay-cable under given tension force, beam bending stiffness can be ignored in predicting its first five natural frequencies using a hinged beam model in FEM. While the predicted lower frequency using clamped beam FEM model is more accurate and reasonable.

Design of Mitigation Damper with Support Flexibility for Stay Cable under Bridge Deck Excitation

2012 ◽  
Vol 238 ◽  
pp. 714-718
Author(s):  
Shuai Luo ◽  
Quan Sheng Yan ◽  
Hong Jun Liu
Keyword(s):  
Bridge Deck ◽  
Damping Coefficient ◽  
Viscous Damper ◽  
Stay Cable ◽  
Rule Of Thumb ◽  
Modal Damping ◽  
Inclined Angle

This paper studies cable-damper mitigation model due to indirect excitation caused by bridge deck excitation. In the new mitigation model, as a rule of thumb, we considered an attached spring associated in tandem with a damper to simulate the supporter flexibility. The result shows that the interaction between the flexibility of the support in the viscous damper could deeply impact the damper effectiveness, and the external damping should be increased deeply to provide the same non-dimensional modal damping when the inclined angle of cable decreases. The optimum damping coefficient of the non-idealized damper increases when the flexibility of the supporter increases.

scholarly journals Temperature Effect on Tension Force of Stay Cable of Cable-Stayed Bridge

2019 ◽  
Vol 9 (1) ◽  
pp. 2251-2257
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Ambient Temperature ◽  
Element Model ◽  
Tension Force ◽  
Stay Cable ◽  
Element Analysis ◽  
Cable Tension ◽  
Cable Stayed Bridge ◽  
The Finite Element Model

Cable is the main element of cable-supported bridge, such as suspension bridge, cable stayed bridge and arch bridge. For the cable-stayed bridge, the cable receives the load from the bridge deck and transfer it to the pylon. As the ambient temperature change, the internal force in bridge element including stayed cable will change. This research investigate the ambient temperature effect to the tension force of stayed cable of cable-stayed bridge by comparing the result of finite element model analysis with the field measurement form electromagnetic sensor data. The finite element model of Merah Putih Cable-Stayed Bridge has been developed based on detailed engineering design data. The finite element model is validated using the natural frequency data from dynamic load test of the bridge. The ambient temperature and bridge elements temperature were measured for 24 hours. The finite element analysis were conducted based on field measurement data and the contribution of pylon and girder temperature to the cable tension forces variation was investigated. The output of finite element analysis then compared to the actual cable tension as measured by an electromagnetic sensor. It was found that the ambient temperature will affecting the magnitude of tension force at stay cable and the variation of cable tension has similar pattern of both from the finite element model and electromagnetic data. As the temperature of bridge element increases or decreases, the bridge will experience a deformation. Since the stay cable connected to the pylon at one side and to the girder at the other side, its will make the stay cable elongated or contracted which in turn will affecting the tension force at stay cable. When evaluating the bridge condition based on the tension force at stay cable, the effect of temperature variation need to be considered.

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