scholarly journals Suspender Replacement Method for Long-Span Concrete-Filled Steel Tubular Arch Bridges and Cable Force Measurement Based on Frequency Method

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Yulin Deng ◽  
Luming Deng
Keyword(s):  
Force Measurement ◽  
Estimation Method ◽  
Traffic Load ◽  
Frequency Method ◽  
Arch Bridge ◽  
Calculated Length ◽  
Long Span ◽  
Replacement Method ◽  
Cable Force ◽  
Cable Force Measurement

The suspenders on the sides of an arch bridge are highly vulnerable to damage caused by traffic load and environmental corrosion. To accurately estimate the cable force of suspenders, herein, we analyse the influencing factors through a suspender tension test based on the principle of suspender vibration. The frequency of each suspender of the bridge is evaluated using the frequency method. By combining the cable force data measured directly and the measured suspender frequency, the formulas for calculating the cable forces of long and short suspenders are fitted, and a reasonable estimation method for the calculated length of short suspenders is provided. The formulas are verified through application to a CFST arch bridge. Results indicate that the proposed formula effectively considers the influence of the sleeve on the overall calculated length of the suspender. The formula calculates the suspender cable force with higher accuracy, proving its suitability for engineering use.

The Research on Cable Force Measurement Based on Degenerated Element with Frequency Method

2013 ◽  
Vol 405-408 ◽  
pp. 1709-1715
Author(s):  
Xin Cui ◽  
Yong Jiang ◽  
Li Wen Fu ◽  
Jin Feng Wang
Keyword(s):  
Numerical Method ◽  
Theoretical Basis ◽  
Force Measurement ◽  
Beam Element ◽  
Testing System ◽  
Frequency Method ◽  
Operation Procedure ◽  
Cable Force ◽  
Cable Force Measurement ◽  
The Given

At present, among the methods of cable force measurement, the frequency method is applied extensively for its mature theory and rapid and repeated operation procedure. Based on the theory of frequency method measurement, it generally uses the numerical method with beam element to analysis the parameters of cables under the given conditions. However, the conventional beam element is not able to simulate the bending stiffness in beams section. Therefore, it turns to degenerated beam element to simulate cables and the results agree well with the results based on beam element and formulas calculation, and it provides theoretical basis for the later cable force testing system.

Portable and convenient cable force measurement using smartphone

2015 ◽  
Vol 5 (4) ◽  
pp. 481-491 ◽  
Author(s):  
Xuefeng Zhao ◽  
Ruicong Han ◽  
Yanbing Ding ◽  
Yan Yu ◽  
Quanhua Guan ◽  
...  
Keyword(s):  
Force Measurement ◽  
Cable Force ◽  
Cable Force Measurement

Feasibility Study for Vision-Based Cable Force Measurement Using Smartphone

2016 ◽  
Author(s):  
Xuefeng Zhao ◽  
Kwang Ri ◽  
Yan Yu ◽  
Chunil Kang ◽  
Mingchu Li ◽  
...  
Keyword(s):  
Measurement Method ◽  
Force Measurement ◽  
Smartphone Application ◽  
Cable Model ◽  
Construction Period ◽  
Service Period ◽  
Cable Force ◽  
Vibration Responses ◽  
Cable Force Measurement ◽  
Circular Target

An accurate cable force measurement is one of very important practical problems during construction period as well as during service period of cable stayed bridge. In the recent years, with the advances in smartphone technologies, it is possible to rapidly evaluate structural health status and postevent damage using ubiquitous smartphones. In this paper, a novel vision-based cable force measurement method using smartphone camera is proposed for the first time, which enable to estimate cable force by recognizing cable vibration using smartphone camera, and then cable model test is carried out to verify the feasibility of the proposed method. The comparison test between the smartphone application Orion-CC measuring cable force from smartphone built-in accelerometer and the proposed method is conducted on a laboratory scale cable model with different sampling rates. In the proposed method, the vibration responses of cable are obtained by monitoring displacements of a preprinted black circular target attached on the cable model using smartphone camera. The test results showed satisfactory agreements between two methods in both frequency domain and cable force value, demonstrating the feasibility of the proposed cable force measurement method and its advantages such as convenience, ease of operation, and speediness.

Calculation of Cable Force for Long-Span Rib Arch Bridge Construction under Seasonal Ambient Temperature

2011 ◽  
Vol 378-379 ◽  
pp. 341-344
Author(s):  
Wei Feng Tian ◽  
Shui Xing Zhou ◽  
Ayad Thabet Saeed Alghabsha
Keyword(s):  
Ambient Temperature ◽  
Control Method ◽  
Difficult Problem ◽  
State Control ◽  
Optimization Analysis ◽  
Arch Bridge ◽  
Long Span ◽  
Unstressed State ◽  
Cable Force ◽  
Cable Forces

Calculation of cable force under seasonal ambient temperature is the key and difficult problem in the construction of long-span rib arch bridge. It affects the final cable forces and deformations of arch rib after arch closure. Unstressed state control method is introduced in the construction of Daning River Bridge; unstressed qualities of ribs and unstressed length of cables can be obtained by optimization analysis of the maximum cantilever state in construction. According to unstressed state control method, the cable forces of each segment were calculated using the forward-iteration method. These results offer the basis for construction control, and guarantee the arch rib line and cable forces to meet the design requirements, and an arch closure with high precision.

Research on Monitoring and Control for Suspender Cable Tension of Half-Through Concrete Filled Steel Tube Arch Bridge

2013 ◽  
Vol 859 ◽  
pp. 131-134
Author(s):  
Fu Li Zhao ◽  
Yi Qiang Xiang ◽  
Qiang Qiang Wu
Keyword(s):  
Steel Tube ◽  
Calculation Formula ◽  
Test Results ◽  
Monitoring And Control ◽  
Frequency Method ◽  
Cable Tension ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Cable Force ◽  
Force Calculation

The measurement accuracy of the cable tensions in the hanger rods of concrete filled steel tube arch bridges is important for the correct evaluation of bridges condition. Based on Jinpan Bridge-a half through concrete filled steel tube arch bridge with 80 m span in Tiantai, it was put forward the vibration frequency method for testing and evaluate suspender tensions with the help of analysis vibration characters of the suspender. The precision of cable force calculation formula was verified after comparing the practical tension with the designed tension obtained from tension jack method. Then, according to the test results and values predicted by the presented cable force calculation formula, the cable tensions were adjusted. Cable tension test results in the finished bridge show that this method is feasible.

Smartphone-Based Mobile Testing Technique for Quick Bridge Cable–Force Measurement

2017 ◽  
Vol 22 (4) ◽  
pp. 06016012 ◽  
Author(s):  
Xuefeng Zhao ◽  
Ruicong Han ◽  
Yan Yu ◽  
Weitong Hu ◽  
Dong Jiao ◽  
...  
Keyword(s):  
Force Measurement ◽  
Testing Technique ◽  
Mobile Testing ◽  
Cable Force ◽  
Bridge Cable ◽  
Cable Force Measurement

Impact Analysis of the Flexural Rigidity on the Frequency and Tension of the Stay Cable

2013 ◽  
Vol 540 ◽  
pp. 153-163
Author(s):  
Yong Ming Sun ◽  
Hang Sun
Keyword(s):  
Finite Element ◽  
Impact Analysis ◽  
Flexural Rigidity ◽  
Force Measurement ◽  
Element Model ◽  
Stay Cable ◽  
Frequency Method ◽  
Actual Measurement ◽  
Cable Force ◽  
Balance Curve

Research and practice show that frequency method is still the most practical and accurate method among all kinds of cable force measurements. Based on the classical string vibration theory, the finite element model of stay cable was created, and a method of iteratively computing stay cable balance curve considering with flexural rigidity was proposed. How dose the flexural rigidity affects the balance curve of stay cable was discussed, and the changing curves of the distance-to-sagging ratio following the pull-to-bend ratio were plotted, which indicated the bigger flexural rigidity, the smaller sagging. 25 pairs cable modality of Xichang cable stayed bridge were accurately analyzed, mode crossover was testified by finite element method, changing curves of frequency and mode shape following the cable force were separately plotted, and changing rule was induced, practical cable force computing method was given. Frequency difference is suitable to judge the rank of actual measurement frequency, and the second frequency is recommended to compute cable force. Engineering instance analysis testified, the method of practical cable force measurement could rule out errors by mode crossover, and be applied to cable with any lengths and any force.

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