Dynamic Analysis of the International Guadiana Bridge

Branco, Fernando A.; Azevedo, João; Correia, Maria João; Costa, Alfredo Campos

doi:10.2749/101686693780607705

Cited by 5 publications

(4 citation statements)

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“…Beam elements with variable cross-section represent the towers. The geometric and mass properties of each structural element have been initially desumed from the available information about the bridge design project [1,3,19]. With respect to the material characteristics, concrete grades in the deck, pylon and piers ranged from 30-45 MPa, and the corresponding elastic modulus used in the FE model were 42-46 GPa.…”

Section: Finite Element Modelmentioning

confidence: 99%

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Cable–deck dynamic interactions at the International Guadiana Bridge: On-site measurements and finite element modelling

Caetano¹,

Cunha²,

Gattulli³

et al. 2008

Struct. Control Health Monit.

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The International Guadiana Bridge is a cable-stayed bridge crossing the Guadiana River, which marks the southern border between Portugal and Spain. The bridge has a central span of 324 m and a total length of 666 m and was open to traffic in 1991. Despite the globally satisfying behaviour under the common environmental loads, which largely ensures the bridge serviceability, frequent episodes of cable vibration have been observed since completion of the construction. In this paper, the bridge modal properties and dynamic behaviour, identified from repeated campaigns of vibration data acquisitions, are compared with the response of a three-dimensional finite element model, including the description of the cable transversal motion. The model, after minor updating, furnishes a realistic reproduction of the current bridge dynamic behaviour. Then different possible justifications of the local vibrations are evaluated, briefly scanning the known sources of large amplitude cable oscillations both in the linear and the nonlinear field. In particular, the occurrence of different internal resonance conditions is deeply discussed, in order to verify whether the experimental observations could be really justified by a cable-deck dynamic interaction mechanism. Among different possibilities, a beating phenomenon between two resonant modes, amplified by the lower damping and inertial characteristics of the local mode with respect to the global one, is selected as the most critical cable excitation source. Since the cable vibrations are proved to persist for different wind conditions, the heavy traffic load on the bridge deck is investigated as one possible source of the global mode direct excitation. On this respect, the model response to random load and moving forces acting on the bridge deck is numerically evaluated evidencing how some particular features of the real bridge behaviour can be qualitatively reproduced.

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Section: Finite Element Modelmentioning

confidence: 99%

“…The bridge was designed by Caˆncio Martins and opened to traffic in 1991. Given the relatively severe wind and high seismic risk characteristics of the site, extensive studies were developed prior, during and after construction [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Cable–deck dynamic interactions at the International Guadiana Bridge: On-site measurements and finite element modelling

Caetano¹,

Cunha²,

Gattulli³

et al. 2008

Struct. Control Health Monit.

View full text Add to dashboard Cite

show abstract

“…Moreover, the occurrence of oneto-two global-local frequency ratio, required for the presented mechanism, seems to be common in recent cable-stayed bridges [2,[13][14][15][16].…”

Section: One-to-two Global-local Internal Resonancementioning

confidence: 96%

“…Also, the modes are strongly coupled at any level of amplitude because a bifurcation threshold does not need to be exceeded to activate the coupling. Finally, in modern cable-stayed bridges, it is common for the lowest global modes to have lower natural frequencies than the lowest cable modes, and, due to the large number of close global and local modes, the one-to-two frequency ratio is likely to occur for some combination of modes [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%