Determining Time Variation of Cable Tension Forces in Suspended Bridges Using Time‐Frequency Analysis

Stromquist-LeVoir, Gannon; McMullen, Kevin F.; Zaghi, Arash E.; Christenson, Richard

doi:10.1155/2018/1053232

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…Tis model only considers the infuence of the stress range on the fatigue life of the steel wire and ignores its actual stress state. Te fatigue test results of the steel wire show that both the stress range and the mean stress afect its fatigue life [32,35,36]. Terefore, it is critical to establish a steel wire fatigue model that considers the stress range and pretension.…”

Section: Fatigue Life Model For Steel Wirementioning

confidence: 99%

Fatigue Life Evaluation of Parallel Steel-Wire Cables under the Combined Actions of Corrosion and Traffic Load

Cheng

Liu

et al. 2023

Structural Control and Health Monitoring

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Fatigue and corrosion are the main reasons for the failure of stay cables. Traffic load also plays a significant role in cable fatigue. To study the fatigue life of stay cables under the combined action of traffic load and corrosion, this study originally deduced the fatigue probability model for steel wires, considering the stress range and average stress based on the nonlinear fatigue damage model. Then, the weight loss rate was introduced into the fatigue probability model for steel wires in order to obtain the fatigue life probability model for corroded steel wires. Subsequently, a Monte Carlo simulation (MCS) was conducted to predict the fatigue life of stay cables under different guaranteed probabilities. Finally, using a cable-stayed bridge on the Yangtze River in China as an example, the fatigue life of the stay cables in the bridge under the combined effects of different corrosive environments and measured traffic loads was evaluated. Results indicate that both the stress range and mean stress affect the fatigue life of the steel wire. The fatigue life of stay cables is determined by a few steel wires with shorter lives, and the stress redistribution accelerates the failure of the inner wire of the stay cables. The fatigue life of the stay cables on background engineering is much less than the design life of the bridge under the combined actions of a middle-level or high-level corrosive environment and traffic load.

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Section: Fatigue Life Model For Steel Wirementioning

confidence: 99%

Fatigue Life Evaluation of Parallel Steel-Wire Cables under the Combined Actions of Corrosion and Traffic Load

Cheng

Liu

et al. 2023

Structural Control and Health Monitoring

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“…For this purpose, it was assumed that the axial force of the cable is a random variable normally distributed. According to the results provided by Stromquist-LeVoir et al, it could be also assumed that this random variable has a range of variation of ± 10% [60]. A sample of stay cables with different values of the axial force was generated.…”

Section: Assessment Of the Vibration Serviceability Limit State Of Thmentioning

confidence: 99%

Motion-Based Design of Passive Damping Systems to Reduce Wind-Induced Vibrations of Stay Cables under Uncertainty Conditions

et al. 2020

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Stay cables exhibit both great slenderness and low damping, which make them sensitive to resonant phenomena induced by the dynamic character of external actions. Furthermore, for these same reasons, their modal properties may vary significantly while in service due to the modification of the operational and environmental conditions. In order to cope with these two limitations, passive damping devices are usually installed at these structural systems. Robust design methods are thus mandatory in order to ensure the adequate behavior of the stay cables without compromising the budget of the passive control systems. To this end, a motion-based design method under uncertainty conditions is proposed and further implemented in this paper. In particular, the proposal focuses on the robust design of different passive damping devices when they are employed to control the response of stay cables under wind-induced vibrations. The proposed method transforms the design problem into a constrained multi-objective optimization problem, where the objective function is defined in terms of the characteristic parameters of the passive damping device, together with an inequality constraint aimed at guaranteeing the serviceability limit state of the structure. The performance of the proposed method was validated via its application to a benchmark structure with vibratory problems: The longest stay cable of the Alamillo bridge (Seville, Spain) was adopted for this purpose. Three different passive damping devices are considered herein, namely: (i) viscous; (ii) elastomeric; and (iii) frictions dampers. The results obtained by the proposed approach are analyzed and further compared with those provided by a conventional method adopted in the Standards. This comparison illustrates how the newly proposed method allows reduction of the cost of the three types of passive damping devices considered in this study without compromising the performance of the structure.The vibratory problems observed in cables of cable-stayed bridges may be classified in terms of the structural elements excited during the vibration phenomenon into the following [2]: (i) localglobal vibratory problems, in which the vibrations involve the excitation of both the cables and the deck of the structure [4]; and (ii) local vibratory problems, in which only the cables of the structure are excited laterally [5]. These vibratory problems may be caused by either of the following: (i) direct excitation sources, such as road traffic, wind [6] or earthquake action [7], or (ii) indirect excitation sources, such as linear internal resonances, parametric excitations or dynamic bifurcations.In this paper, we focus on the case of wind-induced vibrations of stay cables, as this is the source problem of many vibratory issues reported in the literature [2]. As wind-induced vibrations can cause different structural problems on stay cables (like fatigue or comfort problems), two types of measures are normally adopted to mitigate the cable vibrations [8], consisting of either of the follow...

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“…Current methodologies predominantly utilize indirect approaches for cable force measurement, wherein the vibration frequency of the bridge cable is assessed. Subsequently, the correlation between frequency and tension is leveraged to compute the cable force within the bridge [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

PMFSE: a video phase-based micro-vibration measurement algorithm for bridge cables in complex background

Zhang,

Yang,

Zang

2024

Meas. Sci. Technol.

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The cable serves as the primary structural component in cable-stayed bridges, suspension bridges, and other cable-supported bridge designs. Accurate measurement of cable tension holds paramount importance for ensuring the overall safety and stability of bridge structures. Cable tension can be inferred from the vibration frequency, making precise measurement of cable vibration frequency of utmost practical significance. Presently, video-based methodologies, such as phase-based vibration extraction (PVE), present notable advantages in terms of speed, efficiency, and non-contact capabilities over conventional acceleration sensor approaches. However, these methods face challenges in accurately discerning the micro-vibration of cables in complex background interference. To address this problem, a phase magnification-based feature signal extraction (PMFSE) algorithm is proposed, which is suitable for detecting small vibration in complex background. The overall idea is to combine the small vibration enhancement method in spatial domain with the signal separation method in time domain. Specifically, in the spatial domain, edge phase information is amplified through phase amplitude weighting and phase enhancement techniques to mitigate non-edge noise. In time domain, cable signals are extracted based on distinguishing features between the cable signal and noise signal. The efficacy of PMFSE is evaluated in various outdoor experiments. Compared with the state-of-the-art methods, PMFSE exhibits substantial improvements on the cable micro-vibration frequency measurement in complex background.

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Determining Time Variation of Cable Tension Forces in Suspended Bridges Using Time‐Frequency Analysis

Cited by 15 publications

References 18 publications

Fatigue Life Evaluation of Parallel Steel-Wire Cables under the Combined Actions of Corrosion and Traffic Load

Fatigue Life Evaluation of Parallel Steel-Wire Cables under the Combined Actions of Corrosion and Traffic Load

Motion-Based Design of Passive Damping Systems to Reduce Wind-Induced Vibrations of Stay Cables under Uncertainty Conditions

PMFSE: a video phase-based micro-vibration measurement algorithm for bridge cables in complex background

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