Tension force identification for cable of various end-restraints using equivalent effective vibration lengths of mode pairs

Syamsi, Muhammad Ibnu; Wang, Chung-Yue; Nguyen, Van-Son

doi:10.1016/j.measurement.2022.111319

Cited by 24 publications

(14 citation statements)

References 48 publications

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“…With the increase of tension force and aspect ratio, vibration frequency displays an increasing trend, indicating the possibility of using vibration frequency for real-time detection of the tension force state of short suspenders. (2) The relationships between vibration frequency and tension force of steel rod-type short suspenders is influenced mainly by boundary constraints and flexibility of suspenders, leading to the inadaptability of typical tension string theory. It has been found that for steel rod-type short suspenders, there is a quadratic regression relationship between vibration frequency and tension force, controlling the error between experimental and calculated tension force within 5%.…”

Section: Discussionmentioning

confidence: 99%

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Tension Force Detection of Short Suspender by Using Laser Doppler Vibrometer

Huang

Zhang²,

Xie

et al. 2022

Applied Sciences

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In this study, the vibration frequency of steel rod-type short suspenders simulated by three types of prestressed steel rebars with aspect ratios of 14, 20.8, and 37.8 was detected accurately and remotely by using Laser Doppler Vibrometer (LDV); then the tension force state of short suspenders was evaluated through the quadratic regression relationships between vibration frequency and tension force. The results showed that the vibration frequency of steel rod-type short suspenders increases with the increase in tension force, and there is a good correlation between vibration frequency and prestress. Furthermore, when the prestress applied is the same, the vibration frequency of short suspenders decreases with the increase of their aspect ratios, indicating aspect ratio plays a decisive role on the change of vibration frequency. The errors between the tension force obtained by experiment and tension string theoretical calculation for short suspenders are large, due to the nonrigid boundary condition. The establishment of quadratic regression relationships between vibration frequency and tension force effectively avoids the influence of various factors on the existing calculation model such as mass, stiffness, and constraint type, and makes the detection accuracy of tension force achieve 98%.

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Section: Discussionmentioning

confidence: 99%

“…As an important force component, cables with different aspect ratios (those with small aspect ratio are usually called short suspenders) and profiles (strand or steel rod) have been widely used in large-span bridge structures [1][2][3][4]. Maintaining the cable force in design level is key in ensuring structural stability and safety.…”

Section: Introductionmentioning

confidence: 99%

Tension Force Detection of Short Suspender by Using Laser Doppler Vibrometer

Huang

Zhang²,

Xie

et al. 2022

Applied Sciences

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“…Due to the influence of boundary conditions and other factors, there is a complex correlation between the natural frequency of suspenders and the suspender tension, which is another key problem of the frequency method. Many scholars have studied the frequency-based tension identification method under complex boundaries (Ma et al, 2023;Syamsi et al, 2022) by using the dynamic model (Huang et al, 2015;Xu et al, 2019), particle swarm optimization algorithm (Zhang et al, 2021), and other methods. Zhan et al (2018) proposed a Bayesian method based on Markov chain Monte Carlo, which realized the determination of frequency corresponding modal order in the frequency method.…”

Section: Introductionmentioning

confidence: 99%

A method for suspenders tension identification of bridges based on the spatio‐temporal correlation between the girder strain and suspenders tension

Xu,

Gao,

Liu

2024

Computer aided Civil Eng

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In the actual structural health monitoring system of suspension bridges, only part of suspenders tension can be monitored, but not all the suspenders tension can be obtained. To solve this problem, a method for suspenders tension identification of bridges based on the spatio‐temporal correlation between the girder strain and suspenders tension is proposed. By using actual monitoring data of vehicle loads, a spatio‐temporal correlation model of the girder strain and tension forces of all suspenders is constructed based on the combined application of stacked denoising autoencoder and convolutional neural networks‐long short‐term memory model, so as to realize the preliminary identification of suspenders tension. On this basis, by using the actual monitoring data of suspenders tension and the strain monitoring data obtained through the distributed optical fiber sensors, the delicate identification of tension forces of all suspenders is realized based on the error interpolation of preliminary identification results. The results of the example bridge show that the method in this paper can effectively identify tension forces of all suspenders of the suspension bridge, and identification results are more accurate than the method using only the monitoring data of suspenders.

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“…The vibration frequency method has been widely used in practical monitoring because of its high measurement accuracy, intuitive installation, and simple operation [ 19 ]. The equivalent effective length is used to expand the dual mode frequency method.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Cable Force through a Fiber Bragg Grating-Type Thin Rod Vibration Sensor and Its Application

Zhu

Teng

Liu

et al. 2022

Sensors

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The key to evaluating the health status of cable-stayed bridges lies in the accuracy of cable force measurement. When measuring the cable force using the conventional frequency method, the clearance between the bracing cable and the protective tube is typically disregarded. Moreover, due to their large size, existing vibration sensors are difficult to install into protective tubes for steel strand-type bracing cables to measure the cable force. To address the above difficulties, a type of thin rod vibration sensor only 5 mm in diameter was designed based on the high sensitivity of Fiber Bragg grating (FBG), and high-throughput data processing software for engineering calculation (EC) was self-developed. Then, the recognition principle of the thin rod vibration sensor was theoretically analyzed and a step-by-step tension test was carried out. The results demonstrated that the relative error of the cable force measured by the thin rod vibration sensor within 12.865 Hz was less than 5% and the sensitivity reached 28.7 pm/Hz, indicating its high measurement precision. Upon subsequent application of the thin rod vibration sensor to a monitoring test in the field, the relative error of the fundamental frequency between artificial and natural excitations was less than 4%. In addition, the error relative to both the theoretical frequency and the third-party sampling frequency was less than 5%, further verifying the accuracy and applicability for monitoring the cable force of bridges under natural excitation. Compared with the traditional cantilever FBG sensor, the improved sensor with supporting data processing software has the advantages of small cross-section, high reliability, and good sensitivity. The research results can provide a reference for the subsequent accurate measurement of cable force and the development of a supporting sensor data processing system.

show abstract

Tension force identification for cable of various end-restraints using equivalent effective vibration lengths of mode pairs

Cited by 24 publications

References 48 publications

Tension Force Detection of Short Suspender by Using Laser Doppler Vibrometer

Tension Force Detection of Short Suspender by Using Laser Doppler Vibrometer

A method for suspenders tension identification of bridges based on the spatio‐temporal correlation between the girder strain and suspenders tension

Measurement of Cable Force through a Fiber Bragg Grating-Type Thin Rod Vibration Sensor and Its Application

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