Reduction of cable vibrations in a cable stayed bridge under biharmonic excitation

Pakos, Wojciech; Grosel, Jacek

doi:10.1016/j.engstruct.2019.03.054

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…CFRP strip (4) (after fitting and preparing the strip and beam surfaces to be glued) was secured in dead end anchorage (5). The surface of the contact between the strip and the abutments or the beam was properly lubricated with sliding facilitating substance (6) or epoxy adhesive (7). The prestressing force was applied by means of a hydraulic cylinder in live end anchorage (8).…”

Section: Investigative Procedures and Strengthening Of Beamsmentioning

confidence: 99%

“…OMA is, therefore, a method that is widely used in both statically and dynamically loaded structures. For many years this and similar methods have been successfully used to diagnose civil structures [ 4 , 5 , 6 ], their models tested in laboratory conditions [ 7 , 8 ], building elements [ 9 , 10 ], concrete as a material [ 11 , 12 , 13 ] and even concrete in its maturation phase [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

2021

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This paper presents experimental investigations of reinforced concrete (RC) beams flexurally strengthened with carbon fiber reinforced polymer (CFRP) strips. Seven 3300 mm × 250 mm × 150 mm beams of the same design, with the tension reinforcement ratio of 1.01%, were tested. The beams differed in the way they were strengthened: one of the beams was the reference, two beams were passively strengthened as precracked (series B-I), two beams were passively strengthened as unprecracked (series B-II) and two beams were actively strengthened as unprecracked (series B-III). Moreover, the strengthening parameters differed between the particular series. The parameters were: CFRP strip cross-sectional areas (series B-I, B-II) or prestressing forces (series B-III). The beams were statically loaded, up to the assumed force value, in the three-point bending test and deflections at midspan were registered. After unloading the beams were suspended on flexible ropes (the free-free beam system) and their eigenfrequencies were measured using operational modal analysis (OMA). The static measurements (deflections) and the dynamic measurements (eigenfrequencies) were conducted for the adopted loading steps until failure. Static stiffnesses and dynamic stiffnesses were calculated on the basis of respectively the deflections and the eigenfrequencies. The qualitative and quantitative differences between the parameters are described.

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Section: Investigative Procedures and Strengthening Of Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

2021

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“…Therefore, the modal frequency ω n = p and the modal damping ratio ξ n = −Re(p)/ p of the cable can be found by Equation (11). Actually, the inherent cable damping for the real cable is sufficiently small, which is always neglected for cable vibration control design with dampers [15,20,35,51,57,58].…”

Section: Formulation Of the Cable-imd Systemmentioning

confidence: 99%

“…Large oscillations may reduce life span of cables and have detrimental effects on public confidence in the safety of the bridge [6,7]. Structural vibration control methods, including passive control [8], semi-active control [9,10], and active control [11], have been well developed and used for protecting structures against dynamic loading. For stay cables, modifying aerodynamic cable surface [12], connecting multiple cables together [13], installing external dampers [14,15], and combining external dampers with cross-ties [16,17], have been proposed to eliminate such vibrations.…”

Section: Introductionmentioning

confidence: 99%

Refined Study on Free Vibration of a Cable with an Inertial Mass Damper

et al. 2019

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To accurately predict the optimum supplemental modal damping ratio of the cable and the corresponding size of the inertial mass damper (IMD), combined effects of the cable sag, the cable flexural rigidity, and the boundary conditions on the control performance of the cable with the IMD are well investigated in this refined study. An analytical model of the cable-IMD system considering these effects is developed. The equation of motion of the cable-IMD system is transformed into a complex eigenvalue problem through the finite difference method. Experimental results from a scaled cable model with an IMD are then used to verify theoretical solutions. Three typical cables in actual cable-stayed bridges are selected for case studies. The results show that the theoretically predicted modal damping ratios of the cable with an IMD, taking into account the sag and the flexural rigidity, agree well with those identified from experimental results, while would be often overestimated with a taut-cable model. Moreover, experimental damping ratios of the cable always fall between those theoretically calculated with fixed ends or pinned ends for each case. Finally, to be conservative in actual design, it is recommended to use the cable-IMD system model with fixed ends to calculate the required damper size and predict the resulting modal damping ratio of the cable, since the corresponding theoretical solution often gives the lower bound of supplemental damping ratio of the cable.

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Viscoelastic string-beam coupled vibro-impact system: modeling and dynamic analysis

2020

European Journal of Mechanics - A/Solids

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Reduction of cable vibrations in a cable stayed bridge under biharmonic excitation

Cited by 8 publications

References 19 publications

Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

Refined Study on Free Vibration of a Cable with an Inertial Mass Damper

Viscoelastic string-beam coupled vibro-impact system: modeling and dynamic analysis

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