Studies for controlling human-induced vibration of the Pedro e Inês footbridge, Portugal. Part 1: Assessment of dynamic behaviour

Caetano, Elsa; Cunha, Álvaro; Moutinho, Carlos

doi:10.1016/j.engstruct.2009.12.034

Cited by 124 publications

(114 citation statements)

References 2 publications

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“…Caetano et al [31] found similar damping ratios, 0.53% and 0.58%, for the first and second mode shapes of the Pedro e Ines footbridge in Portugal. As a result, for this work, the damping ratio of the structure alone was taken to be 0.5% for the first two modes, with Rayleigh damping assumed thereafter [32].…”

Section: Bridge Dampingmentioning

confidence: 62%

Enhancement factors for the vertical response of footbridges subjected to stochastic crowd loading

Caprani¹,

Keogh²,

Archbold

et al. 2012

Computers & Structures

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The vertical acceleration response of a hypothetical footbridge is predicted for a sample of single pedestrians and a crowd of pedestrians using a probabilistic approach. This approach uses statistical distributions to account for the fact that pedestrian parameters are not identical for all pedestrians. Enhancement factors are proposed for predicting the response due to a crowd based on the predicted accelerations of a single pedestrian. The significant contribution of this work is the generation of response curves identifying enhancement factors for a range of crowd densities and synchronization levels.

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Section: Bridge Dampingmentioning

confidence: 62%

Enhancement factors for the vertical response of footbridges subjected to stochastic crowd loading

Caprani¹,

Keogh²,

Archbold

et al. 2012

Computers & Structures

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“…Now, it is relevant to point out some works with recent and interesting applications. In [47], it is described the ambient vibration test of the Humber Bridge, the largest suspension bridge in the United Kingdom; Siringoringo and Fujino [48] describe the processing of a database collected in a suspension bridge in Japan (Hakucho Bridge); in [49] several relevant applications on bridges and other special structures are presented; in [50], it is demonstrated the usefulness of ambient vibration tests in the context of the implementation of vibration control devices; Pakzad and Fences [51] present the results obtained with an ambient vibration test performed on the Golden Gate Bridge with wireless sensors; Carne and James III [52] describe the use of OMA in wind turbines testing; reference [53] characterizes the monitoring of historical masonry structures, taking profit from OMA.…”

Section: Discussionmentioning

confidence: 99%

Explaining operational modal analysis with data from an arch bridge

Magalhães

Cunha

2011

Mechanical Systems and Signal Processing

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a b s t r a c tThis tutorial paper aims to introduce the topic of operational modal analysis to nonspecialists on the subject. First of all, it is stressed the relevance of this experimental technique particularly in the assessment of important civil infrastructure. Then, after a synthesis of required theoretical background, three of the most powerful algorithms for output-only modal identification are presented. The several steps of these identification procedures are illustrated with the processing of data collected on a concrete arch bridge with a span of 280 m. As the use of operational modal analysis in the context of structural health monitoring is a subject under active research, this theme is also introduced and briefly exemplified with data continuously recorded at the same bridge.

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“…Nevertheless, footbridges are generally slender structures due to the structural solutions adopted even for aesthetic requirements and the using of deformable elements, and so they are increasingly sensitive to dynamic vibrations induced by pedestrian actions [1,2] that can compromise the comfort serviceability conditions. Hence, the full assessment of footbridge dynamic behaviour with reference to pedestrian dynamic amplifications is a topical issue in the vibration serviceability analyses [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analyses of a Curved Cable-Stayed Footbridge Under Human Induced Vibrations: Numerical Models and Experimental Tests

Bassoli¹,

Gambarelli²,

Simonini³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. Nowadays, pedestrian bridges are increasingly lively and slender structures due to the development of improved structural materials and aesthetic requirements. As a result of INTRODUCTIONOver the last decades, cable-stayed bridges and footbridges have reached great importance and popularity thanks to the ease of construction, the economical convenience and the reduction of the deck bending moments due to the benefit of cables. Nevertheless, footbridges are generally slender structures due to the structural solutions adopted even for aesthetic requirements and the using of deformable elements, and so they are increasingly sensitive to dynamic vibrations induced by pedestrian actions [1,2] that can compromise the comfort serviceability conditions. Hence, the full assessment of footbridge dynamic behaviour with reference to pedestrian dynamic amplifications is a topical issue in the vibration serviceability analyses [3][4][5].Accurate FE models are often needed to investigate the dynamic behaviour of these kinds of structures and to reproduce the pedestrian effects through dynamic analyses considering adequate human-induced load models. However, the complex shapes of these structures usually involve difficulties in accurate structural modelling and simulation. Therefore, model updating procedures are required to develop reliable models starting from the comparison between the structural dynamic behaviour investigated through dynamic tests and its numerical model response [6].This paper is a part of a research that aims to characterize the dynamic behaviour of a curved cable-stayed footbridge subjected to pedestrian loads starting from experimental tests and numerical dynamic analyses. The case study is the Pasternak footbridge that is about 270 meters long and 3 meters wide and it crosses an important freeway in Modena (Italy). It is composed of two steel towers 18 meters high that support the steel-concrete deck by means of 6 pairs of cables.First of all, the dynamic behaviour of the footbridge is investigated thanks to an experimental campaign performed by means of an advanced MEMS-based SHM system [7]. Through the dynamic tests the accelerations due to ambient vibrations (wind) are recorded and the modal parameters (frequencies, mode shapes and damping ratios) are identified [8].To study the dynamic behaviour of the footbridge subjected to pedestrian loads, several experimental tests were performed with different-sized groups crossing the footbridge running, free or synchronized walking with different pacing frequencies. To simulate dynamic loading conditions due to a single pedestrian or a crowd of people crossing the structure, two mathematical models are examined. In these models, vertical dynamic actions depend on the pacing frequency, the walking (or running) speed, the step length, the number of people involved and the synchronous action modelling. To apply the first approach, a finite element model is developed and calibrated so that the numerical dynamic predictions agree with the experimental ...

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Studies for controlling human-induced vibration of the Pedro e Inês footbridge, Portugal. Part 1: Assessment of dynamic behaviour

Cited by 124 publications

References 2 publications

Enhancement factors for the vertical response of footbridges subjected to stochastic crowd loading

Enhancement factors for the vertical response of footbridges subjected to stochastic crowd loading

Explaining operational modal analysis with data from an arch bridge

Dynamic Analyses of a Curved Cable-Stayed Footbridge Under Human Induced Vibrations: Numerical Models and Experimental Tests

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