Free vibration of two taut cables interconnected by a damper

Zhou, Haijun; Zhou, Xiaofeng; Yao, Guozao; Sun, Lijun; Xing, Feng

doi:10.1002/stc.2423

Cited by 23 publications

(7 citation statements)

References 42 publications

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“…El Centro waves with 55, 150, and 310 gal of PGA are input to the structures, respectively. 42 The structures with M-1 and S-1 are named FM-1 and FS-1. The story drift ratios are shown in Figure 25.…”

Section: Comparison Of Theoretical Experimental and Simulation Resultsmentioning

confidence: 99%

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Mechanical performance and damping effect of multi‐stage yield metal sleeve damper

Cheng

et al. 2021

Structural Contr & Hlth

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The traditional metal yield dampers such as buckling-restrained brace are designed only for strong earthquakes. Under small earthquake, it is difficult to dissipate the energy for common single-stage yield damper. In addition, it is difficult to observe its damage state after earthquake and inconvenient to replace the energy dissipation components separately. Therefore, a new metal sleeve damper which can dissipate the energy under all levels of earthquakes is proposed in this study. Due to the different yield displacements of the energy dissipation strips with different aspect ratios, the damper has multi-stage yield characteristics. Considering the stiffness degradation effect from the semi-rigid joints on both sides of the strips, the mechanical performance parameters of the damper are derived. The quasi-static experiment of the damper is carried out. Finite element method (FEM) is utilized to simulate the performance of the damper. At last, the damping effects of the multi-stage yield damper and common single-stage yield damper are compared. The results indicate that the accuracies of the mechanical performance parameters computation formulas are high. The energy dissipation performance of the multi-stage yield damper is excellent. The correctness of the finite element (FE) modeling method is verified. The seismic performance of the RC frame with the multi-stage yield damper is improved significantly under all levels of earthquakes. Comparing with the single-stage yield damper, the multi-stage yield damper is more effective in the vibration control of the reinforced concrete (RC) frame.finite element method, mechanical performance, metal damper, multi-stage yield, quasistatic experiment | INTRODUCTIONMetal yield dampers which are widely used in structural seismic control have the advantages of clear mechanism and stable performance. 1 Common metal yield dampers mainly include buckling-restrained brace (BRB), shear panel damper, bending panel damper, and lead damper. 2,3 BRB has been intensively investigated, and it is widely used in seismic structures since its excellent damping performance and convenient installation. 4 The mechanical property of the BRB was analyzed by Carmeron et al. 5 A quasistatic experiment was carried out to obtain the hysteretic performance of the BRB. The Bouc-Wen model was

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Section: Comparison Of Theoretical Experimental and Simulation Resultsmentioning

confidence: 99%

“…In SAP2000, a multi‐linear plastic model is used to simulate M‐1 and S‐1. El Centro waves with 55, 150, and 310 gal of PGA are input to the structures, respectively 42 . The structures with M‐1 and S‐1 are named FM‐1 and FS‐1.…”

Section: Damping Effect Of Mymtdmentioning

confidence: 99%

Mechanical performance and damping effect of multi‐stage yield metal sleeve damper

Cheng

et al. 2021

Structural Contr & Hlth

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“…Method II: Maximizing the average value μ ξ n ð Þ of the modal damping ratios of the considered cable modes, meanwhile minimizing their standard deviation σ ξ n ð Þ. Using the maximum of μ ξ n ð ÞÀσ ξ n ð Þ to evaluate the performance of attached dampers in mitigating cable multimode vibrations, 67 the multimode vibration mitigation performance index designed for the considered cable modes by this method is defined as…”

Section: Comparisons Of Multimode Parameter Optimization Methodsmentioning

confidence: 99%

“… Method II: Maximizing the average value

μ ((), ξ_{n})

of the modal damping ratios of the considered cable modes, meanwhile minimizing their standard deviation

σ ((), ξ_{n})

. Using the maximum of

μ ((), ξ_{n}) - σ ((), ξ_{n})

to evaluate the performance of attached dampers in mitigating cable multimode vibrations, 67 the multimode vibration mitigation performance index designed for the considered cable modes by this method is defined as

J_{2} goodbreak= \max ((), μ ((), c_{normald}) goodbreak- σ ((), c_{normald}))

where

μ ((), c_{normald})

and

σ ((), c_{normald})

denote the mean and standard deviation of modal damping ratios designed for the considered cable modes, which can be calculated by

μ ((), c_{normald}) goodbreak= \frac{1}{n} \sum_{i = 1}^{n} ξ_{i} ((), c_{normald})

normalσ ((), c_{normald}) goodbreak= \sqrt{\sum_{i = 1}^{n} \frac{{((), ξ_{i} ((), c_{normald}) goodbreak- μ ((), c_{normald}))}^{2}}{n}}

where n is the considered cable mode orders.…”

Section: Multimode Parameter Optimization Of Two Ecimds For a Typical...mentioning

confidence: 99%

Damping of a stay cable with two eddy‐current inertial mass dampers: Theoretical analysis, experimental study, and parameter optimization

Wang

Cheng

Wang

et al. 2022

Structural Contr & Hlth

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Recent studies have demonstrated that inerter-based dampers exhibit superior performance in mitigating cable vibration over conventional passive viscous dampers (VDs). This paper develops a new inerter-based damper called the eddy-current inertial mass damper (ECIMD), which consists of a rotary eddycurrent damping element and a paralleled ball screw inertial mass element.Inspired by the advantages of two VDs on a single stay cable, the damping of a stay cable with two ECIMDs, either at opposite cable ends or the same cable end, was investigated through theoretical analysis, experimental study, and parameter optimization. First, the mechanical model of the ECIMD was derived from the geometrical configuration, and its effectiveness was verified through mechanical performance tests on two ECIMD prototypes. Subsequently, theoretical analysis models of the cable-ECIMD system were established by considering the cable sag, flexural stiffness, and boundary conditions. Furthermore, control performances of a model cable attached with two ECIMDs were experimentally evaluated. Finally, the multimode damping effect of two ECIMDs at the same cable end was highlighted through parameter optimization. Results show that when two ECIMDs are installed at opposite cable ends, the coupled single-mode damping effect of two ECIMDs is approximately the sum of individual contributions from each ECIMD. When mechanical properties of two ECIMDs at the same cable end can match well with each other, the coupled single-mode and multimode damping effect of two ECIMDs can be significantly enhanced compared with that of a single ECIMD installed at a further distance away from the cable anchorage.

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“…Zhou et al (2015) and Ahmad et al (2018a) investigated two cables interconnected by a spring and with dampers attached to the cable near its anchorage. Zhou et al (2019b) obtained frequency and damping evolution of a two-cable network interconnected with a damper along with variations in damper coefficient and location, and proposed a design method targeting multimode damping. It is difficult to draw general conclusions on the frequency and damping characteristics even for those relatively simple systems.…”

Section: Cable Multimode Vibration Mitigationmentioning

confidence: 99%

Stay cable vibration mitigation: A review

Sun

Chen

Huang

2022

Advances in Structural Engineering

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Stay cables in cable-stayed bridges are subjected to various types of dynamic excitation mechanisms under environmental loads. The excited vibrations can have a large amplitude because of low vibration frequencies and small inherent damping of cables. As cables become longer (the longest cables are around 600 m in cable-stayed bridges with a main span of 1000 m), more modes are vulnerable to wind and rain-wind induced vibrations, posing challenges to vibration mitigation. This paper presents a comprehensive review of recent advances in stay cable vibration mitigation, including theoretical modeling of cable damping system and techniques for enhancing multimode damping. Recent results on cable damping measurements, understanding of cable vibrations, and relevant aerodynamic countermeasures are also recalled. The reflections can provide guidance for cable vibration control design of cable-supported bridges and for the maintenance/upgrade of cable vibration mitigation system of existing bridges.

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Free vibration of two taut cables interconnected by a damper

Cited by 23 publications

References 42 publications

Mechanical performance and damping effect of multi‐stage yield metal sleeve damper

Mechanical performance and damping effect of multi‐stage yield metal sleeve damper

Damping of a stay cable with two eddy‐current inertial mass dampers: Theoretical analysis, experimental study, and parameter optimization

Stay cable vibration mitigation: A review

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