Design and Performance of a Tuned Vibration Absorber for a Full-Scale Lightweight FRP Pedestrian Structure

Gallegos-Calderón, Christian; Naranjo-Pérez, Javier; García‐Palacios, Jaime H.; Díaz, Iván M.

doi:10.1061/(asce)cc.1943-5614.0001270

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…The length and width of the footbridge are 10.0 m and 1.50 m, respectively. The vertical bending vibration mode of the bridge presents a modal effective mass (m s ) of 405 kg, a natural frequency (f s ) of 7.47 Hz, and a damping ratio (ζ s ) of 1.40% [10]. For the tests, three and eight people walking continuously for 5 minutes over the deck were considered to represent weak and dense TCs, respectively.…”

Section: Laboratory Footbridgementioning

confidence: 99%

Lightweight footbridges subjected to streams of pedestrians: tests and discussion of a crowd-structure interaction model

Gallegos-Calderón,

Naranjo-Pérez,

Jiménez-Alonso

et al. 2024

J. Phys.: Conf. Ser.

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Human-induced vibrations in slender lightweight footbridges have been extensively investigated in the last 30 years. In existing guidelines, the dynamic response of a footbridge can be assessed considering the pedestrians as external non-interacting loads acting on the structure. For a more realistic load model, individuals defined as single Degree of Freedom (DOF) dynamic systems moving along the structure have been employed by researchers and practitioners. Hence, Human-Structure Interaction (HSI) is considered in the dynamic analysis. Adopting this approach to calculate the vibration levels on a footbridge may lead to a costly computational problem when dealing with a crowd due to the large number of DOFs associated to the pedestrians. Recently, a frequency-domain procedure based on a coupled crowd-structure system has been proposed by the authors to overcome the aforementioned issue. To further validate the proposal, the analytical results should be contrasted with experimental measurements. In this sense, this paper presents the dynamic response of two footbridges under the action of streams of walking pedestrians. A laboratory fibre reinforced polymer structure is firstly analysed, and an in-service cable-stayed steel footbridge is secondly studied. The vibration serviceability of both pedestrian structures is assessed considering 0.20 and 0.50 pedestrians/m2. For each bridge, the experimental results are compared with predictions computed through the application of load models from existing guidelines. In addition, the frequency-domain proposal is employed to calculate the steady-state structural response while accounting for HSI. Since dynamic parameters of the human body must be defined for the second approach, different values available in literature are employed. Results demonstrate the overestimation of the response when provisions stated in current design documents are used. Also, the benefits of the novel procedure to consider Crowd-Structure Interaction on lightweight footbridges are highlighted.

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Section: Laboratory Footbridgementioning

confidence: 99%

Lightweight footbridges subjected to streams of pedestrians: tests and discussion of a crowd-structure interaction model

Gallegos-Calderón,

Naranjo-Pérez,

Jiménez-Alonso

et al. 2024

J. Phys.: Conf. Ser.

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“…In the need to improve the dynamic behavior of these structures, some recent studies deal with the application of passive or semi-active control techniques. Gallegos-Calderón et al (22) present the design of a passive inertial controller to be installed on an ultralight-weigth fiberreinforced footbridge. Saber et al (23) compare the retrofit of a footbridge experiencing frequency variations over time and under walking pedestrians with semi-active and classical passive dynamic vibration absorbers.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling and vibration serviceability assessment of a steel footbridge with a significant 3D dynamic behaviour

Roda-Casanova

Hernández-Figueirido

Sancho-Bru

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper focuses on the vibration serviceability assessment and numerical modelling of an existing steel truss footbridge located in the outskirts of Castellón, Spain. The footbridge is rather slender and composed by a main span and two access ramps supported on three 4-arm piers of different heights. Due to the connection between the main span and the ramps at the top of the tall piers, longitudinal and lateral bending/torsion natural coupled modes of vibration coexist at low frequencies, with a relevant contribution of the piers and access ramps deformation. This leads to a significant three-dimensional and rather complex dynamic response under service conditions. With the aim of characterising the structural dynamic properties and assessing the level of vibrations induced by crossing pedestrians, two in-situ experimental test programmes are conducted. On the one hand, the structural response is measured during several hammer tests and the modal properties are identified and used to update a detailed 3D numerical model by means of a Genetic Algorithm. Due to the lack of information regarding the detailing of the piers foundations, two alternative models are analysed. The relevance of the pier-foundation system rotational stiffness is highlighted for the particular configuration. On the other hand, the footbridge main span response is recorded under different pedestrian activities: walking, running and vandal simulated actions. Finally, the vibration serviceability of the structure is assessed based on current codes and regulations.

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Dynamic Response of a Controlled FRP Footbridge: Implications of Human-Structure Interaction Phenomenon

Díaz,

Gallegos-Calderón,

Naranjo-Pérez

et al. 2023

Lecture Notes in Civil Engineering

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Design and Performance of a Tuned Vibration Absorber for a Full-Scale Lightweight FRP Pedestrian Structure

Cited by 5 publications

References 25 publications

Lightweight footbridges subjected to streams of pedestrians: tests and discussion of a crowd-structure interaction model

Lightweight footbridges subjected to streams of pedestrians: tests and discussion of a crowd-structure interaction model

Numerical modelling and vibration serviceability assessment of a steel footbridge with a significant 3D dynamic behaviour

Dynamic Response of a Controlled FRP Footbridge: Implications of Human-Structure Interaction Phenomenon

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