The Viana footbridge: construction and dynamic monitoring

Barbosa, R C; Magalhães, Filipe; Caetano, Elsa; Cunha, Álvaro

doi:10.1680/bren.10.00048

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…For several years, we have been building a database on the main dynamic characteristics of different types of footbridges built in Portugal. In this paper, we report a group of 79 footbridges of different typologies, setting correlations between the fundamental frequencies in the three orthogonal directions and their larger span length, (Table 1 [1][2][3][4][5]). We also look at numerical modelling of a few structures representative of the most common footbridges in Portugal, and compare the results of these models with those of in situ testing, both for the fundamental frequencies and for the amplitudes produced by given pedestrian loading.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Frequencies of Vibration of Footbridges in Portugal: FromIn SituMeasurements to Numerical Modelling

Oliveira

2014

Shock and Vibration

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Since 1995, we have been measuring thein situdynamic characteristics of different types of footbridges built in Portugal (essentially steel and precast reinforced concrete decks) with single spans running from 11 to 110 m long, using expedite exciting and measuring techniques. A database has been created, containing not only the fundamental dynamic characteristics of those structures (transversal, longitudinal, and vertical frequencies) but also their most important geometric and mechanical properties. This database, with 79 structures organized into 5 main typologies, allows the setting of correlations of fundamental frequencies as a negative power function of span lengthsL (L-0.6toL-1.4). For 63 footbridges of more simple geometry, it was possible to obtain these correlations by typology. A few illustrative cases representing the most common typologies show that linear numerical models can reproduce thein situmeasurements with great accuracy, not only matching the frequencies of vibration but also the amplitudes of motion caused by several pedestrian load patterns.

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Section: Introductionmentioning

confidence: 99%

Fundamental Frequencies of Vibration of Footbridges in Portugal: FromIn SituMeasurements to Numerical Modelling

Oliveira

2014

Shock and Vibration

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“…The first step for the experimental estimation of the parameters of the pedestrian SDOF system is the updating of the FE model of Viana footbridge . The footbridge has two spans of about 36.50 and 9.00 m, respectively.…”

Section: Experimental Estimation Of the Pedestrian Modal Parameters Imentioning

confidence: 99%

“…Additionally, the interaction between the two submodels is enforced by implementing two different thresholds, in such way that if certain acceleration limits are exceeded the affected pedestrians change their behaviour in the crowd. The parameters of the pedestrian‐structure interaction model have been estimated experimentally based on the results of two experimental pedestrian tests conducted on a real footbridge (Viana footbridge) . Finally, the lateral crowd‐structure‐interaction model has been validated by correlating successfully the experimental and numerical analysis of the change of the first lateral natural frequency on a different real footbridge (Pedro e Inês footbridge) during the development of a lateral pedestrian lock‐in test …”

Section: Introductionmentioning

confidence: 99%

Lateral crowd‐structure interaction model to analyse the change of the modal properties of footbridges

Jiménez‐Alonso

Sáez

Caetano

et al. 2019

Struct Control Health Monit

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In this paper, a biomechanical crowd-structure interaction model is proposed and calibrated in order to take into account the change of the modal properties of footbridges in lateral direction induced by the pedestrian walking action.The model involves two submodels, namely, (a) the pedestrian-structure interaction and (b) the crowd submodels. In the first submodel, a single degree of freedom system, which simulates the behaviour of each pedestrian, is projected on the vibration modes of the structure. Herein, the parameters of the first submodel are estimated experimentally from the results of several pedestrian tests conducted on a real footbridge. For the second submodel, the crowd behaviour is modelled via a multiagent method. The performance of the overall model has been assessed successfully via the correlation between the change of the first experimental lateral natural frequency of another footbridge during a pedestrian test and the numerical predictions provided by the proposed model. Therefore, this model becomes a valuable tool to analyse numerically the change of the modal parameters of footbridges due to the pedestrianstructure interaction.KEYWORDS change of natural frequencies, crowd dynamics, footbridge, lateral lock-in phenomenon, pedestrianstructure interaction, simplified biomechanical model | INTRODUCTIONAfter the vibratory problems occurred during the opening ceremony of the Millennium footbridge (London, UK), 1 the analysis of the behaviour of footbridges, due to the lateral pedestrian induced vibrations, has become an essential part of their structural design. 2 During the last two decades, many models have been proposed in the literature to simulate the excitation generated by the pedestrian-induced lateral vibrations. These models may be classified into one of the following categories: (a) direct resonance, (b) internal resonance, and (c) dynamic interaction between the pedestrians and the footbridge. 3 Herein, the proposed model can be ascribed to this third category, where the excitation mechanism is originated by the coexistence of an interaction between both pedestrians and the movement of the bridge and among pedestrians themselves.The first attempt to simulate the pedestrian-structure interaction was based on the assumption that a walking pedestrian may be modelled by a pendulum walking model, where a lumped mass situated at the pedestrian's centre of gravity is linked to the structure by a rigid massless element. In 1992, this idea was used by Abe and Fujino 4 to propose a non-linear model for the lateral pedestrian force in terms of the inertial force of the pedestrian and the

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“…The John Henry Garood King Prize, awarded to the best paper on tunnels, soil mechanics or bridges, was awarded to Barbosa et al (2013).…”

Section: John Henry Garood King Prizementioning

confidence: 99%

Award-winning papers in 2013

2015

Proceedings of the Institution of Civil Engineers - Bridge Engi

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The Viana footbridge: construction and dynamic monitoring

Cited by 8 publications

References 5 publications

Fundamental Frequencies of Vibration of Footbridges in Portugal: FromIn SituMeasurements to Numerical Modelling

Fundamental Frequencies of Vibration of Footbridges in Portugal: FromIn SituMeasurements to Numerical Modelling

Lateral crowd‐structure interaction model to analyse the change of the modal properties of footbridges

Award-winning papers in 2013

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