Dynamic Analysis of Large-Diameter Sagged Cables Taking Into Account Flexural Rigidity

Ni, Yiqing; Ko, J. M.; Zheng, Gang

doi:10.1006/jsvi.2002.5060

Cited by 123 publications

(46 citation statements)

References 12 publications

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“…With some improvements, this methodology has also been applied to more complex cases, involving very long sagged cables, short stiff cables, low tensioned cables, cables anchored on flexible supports and groups of clamped cables. For these cases, specific formulae based on simplified analytical solutions have been used [8][9][10][11], as well as numerical formulations allowing the identification of various cable parameters from the measurement of sets of natural frequencies and from particular assumptions respecting the boundary conditions [12][13][14]. Considering applications in low sagged cables, typical from long span cable-stayed bridges, it is relevant to cite the simplified formulae derived by Mehrabi and Tabatabai [10].…”

Section: Identification Of Cable Forcementioning

confidence: 99%

“…This allows the simultaneous identification of force and some of the uncertain governing parameters, using optimisation criteria and curve fitting techniques ( [12], [13], [16]. On the other hand, considering also the progress in the numerical modelling of complex structures, the combination of numerical models with experimental testing and identification techniques can provide an extremely powerful tool in the estimation of cable force for applications characterised by significant dispersive behaviour( [14], [16]), as will be subsequently illustrated.…”

Section: Identification Of Cable Forcementioning

confidence: 99%

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Dynamic testing of cable structures

Caetano

Cunha

2015

MATEC Web of Conferences

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Abstract. The paper discusses the role of dynamic testing in the study of cable structures. In this context, the identification of cable force based on vibration measurements is discussed. Vibration and damping assessment are then introduced as the focus of dynamic monitoring systems, and particular aspects of the structural behaviour under environmental loads are analysed. Diverse application results are presented to support the discussion centred on cable-stayed bridges, roof structures, a guyed mast and a transmission line.

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Section: Identification Of Cable Forcementioning

confidence: 99%

Section: Identification Of Cable Forcementioning

confidence: 99%

Dynamic testing of cable structures

Caetano

Cunha

2015

MATEC Web of Conferences

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“…Ozdemir [7] and also Jayaraman and Knudson [8] presented some formulations for non-linear finite element modeling of cables by introducing a three-node curved element for the cable. Ni et al [9] extended previous FEM formulas by introducing an isoparametric curved element for the cable. For the case that two rubber bushings are attached to the cable ends, the authors [10] conducted an eigenvalue analysis with the FEM formulations presented by Ni et al They concluded that, when the two rubber bushings are close to the cable ends, each rubber bushing can be designed separately by using the Pachecco universal estimation curve.…”

Section: Introductionmentioning

confidence: 97%

Potential of viscous dampers for vibration mitigation of transmission overhead lines

Bassam¹,

Soltani²

2015

SPIE Proceedings

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One of the important parameters in the design of transmission lines is the evaluation of the susceptibility of these cables to vibrations and if necessary, providing proper means to mitigate these vibrations. Transmission lines are especially susceptible to vibrations as a result of their light weight. Viscous dampers are one of the tools that can be applied to mitigate cable vibrations. However, the damping ratio obtained by these dampers is very limited. The present study provides a finite element formulation for an isoparametric cable element. A comparison is made between the results of presented approach with finite series method to validate the model. Additionally, a comparison is made between linear and non-linear behavior of a cable under sweep sinusoidal excitations with different amplitudes. Finally, a case study is conducted to investigate the potential of additional damping provided by a third viscous damper for the case in which two rubber bushings are already attached to the cable near the anchorages. Based on this case study, the dependency between the third damper location and optimum viscosity for maximum vibration mitigation that can be given to a cable with rubber bushings is investigated. The results of the present study show that although rubber bushings may help mitigating vibrations, they reduce the effect of additional damping devices. Additionally, for non-sagged cables, the nonlinearity is negligible in moderate vibrations. Lastly, if the third damper viscosity is selected properly, it can be very effective in further mitigating the vibrations amplitudes.

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“…To alleviate this problem, the indirect method was developed using vibration frequency of the strand, which is widely used in practice. However, the indirect method is easily affected by boundary conditions and bending rigidity (Ni, 2002;Riceiardi and Saitta, 2008;Liu and Liu, 2010;Choi and Park, 2011;Li et al, 2011). Many studies were conducted for cable tension control of cable-stayed bridges (Loh and Chang, 2007;Hua et al, 2009;Ye et al, 2012), and a few conclusions could be taken as references for the strand tension control in the anchor span of suspension bridges.…”

Section: Introductionmentioning

confidence: 99%

Strand Tension Control in Anchor Span for Suspension Bridge Using Dynamic Balance Theory

Wang

Zhang

Liu

et al. 2016

Lat. Am. j. solids struct.

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Strand tension control is essential in suspension bridge safety. However, few quantitative studies have examined the bending rigidity and boundary condition behavior of strands in the anchor span of suspension bridges because of their special structure and complex configuration. In this paper, a new calculation method for strand tension is explored by using dynamic balance theory to determine the effect of bending rigidity and boundary conditions. The accuracy and effectiveness of the proposed method are tested and confirmed with verification examples and application on Nanxi Yangtze Suspension Bridge in China. The results indicated that only low-order frequency calculation could be used to calculate the strand tension without considering the effect of bending rigidity to ensure control accuracy. The influence of bending rigidity on the control precision is related to the tension and the length of the strands, which is significantly determined by the specific value between the stress rigidity and the bending rigidity. The uncertain boundary conditions of the anchor span cable, which are fixed between consolidated and hinged, also have a major effect on the control accuracy. To improve the accuracy of strand tension control, the least squares method is proposed during the tension construction control of the anchor span. This approach can significantly improve the accuracy of the tension control of the main cable strand. Some recommendations for future bridge analysis are provided based on the results of this study.

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Dynamic Analysis of Large-Diameter Sagged Cables Taking Into Account Flexural Rigidity

Cited by 123 publications

References 12 publications

Dynamic testing of cable structures

Dynamic testing of cable structures

Potential of viscous dampers for vibration mitigation of transmission overhead lines

Strand Tension Control in Anchor Span for Suspension Bridge Using Dynamic Balance Theory

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