Fundamental Mode Estimation for Modern Cable-Stayed Bridges Considering the Tower Flexibility

Cámara, Alfredo; Suárez, Miguel Ángel Astiz; Ye, A. J.

doi:10.1061/(asce)be.1943-5592.0000585

Cited by 30 publications

(19 citation statements)

References 15 publications

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“…Their design is governed by the response to dynamic actions such as wind or earthquakes due to their characteristic flexibility and low damping [1]. Furthermore, complex modal couplings arise from the interaction between the towers, the deck and the cable-system and depend upon their relative stiffness and mass, as well as the frequency content of the excitation [2,3]. It is essential to have a clear understanding on these effects in order to ensure the adequate response of the structure under different loading scenarios.…”

Section: Introductionmentioning

confidence: 99%

“…Different vibration modes involving the deformation of one or more of these three components play an essential role in the seismic response. Cable-stayed bridges below 400 m main span length present important modal couplings between the deck and the towers that affect the fundamental vibration modes [3]. However, in long-span bridges the first vibration mode involves exclussively the transverse flexure of the deck, with little or no interaction with the towers [17].…”

Section: Introductionmentioning

confidence: 99%

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Deck–tower interaction in the transverse seismic response of cable-stayed bridges and optimum configurations

Cámara

Efthymiou

2016

Engineering Structures

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deck–tower interaction in the transverse seismic response of cable-stayed bridges and optimum configurations

Cámara

Efthymiou

2016

Engineering Structures

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“…Figure 2 shows the elevation and plan view of the deck, the towers and the cable-system. Different FE models are defined parametrically in terms of L P according to Camara et al [27]. The tower geometry includes a smooth transition between the lateral legs and the transverse struts, as shown in Figure 2(b).…”

Section: Proposed Bridges and Numerical Modelsmentioning

confidence: 99%

Design of hysteretic dampers with optimal ductility for the transverse seismic control of cable‐stayed bridges

Cámara

Cristantielli

Suárez

et al. 2017

Earthq Engng Struct Dyn

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Cable-stayed bridges require a careful consideration of the lateral force exerted by the deck on the towers under strong earthquakes. This work explores the seismic response of cable-stayed bridges with yielding metallic dampers composed of triangular plates (TADAS) that connect the deck with the supports in the transverse direction. A design method based on an equivalent single-degree of freedom approximation is proposed. This is proved valid for conventional cable-stayed bridges with 200 and 400 m main spans, but not 600 m. The height of the plates is chosen to (1) achieve a yielding capacity that limits the maximum force transmitted from the deck to the towers, and to (2) control the hysteretic energy that the dampers dissipate by defining their design ductility. In order to select the optimal ductility and the damper configuration, a multi- objective response factor that accounts for the energy dissipation, peak damper displacement and low-cycle fatigue is introduced. The design method is applied to cable-stayed bridges with different spans and deck- support connections. The results show that the dissipation by plastic deformation in the dampers prevents significant damage in the towers of the short-to-medium span bridges under the extreme seismic actions . However, the transverse response of the towers in the bridge with 600 m span is less sensitive to the TADAS dampers

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“…The parametric models of cable-stayed bridges employed in this study are based on the work of Camara et al [22]. The bridges are formed of two concrete towers with H-shape, a composite deck and two lateral cable planes in a semi-harp configuration.…”

Section: Geometry and Modelling Assumptionsmentioning

confidence: 99%

The Effect of Multi-Angle, Spatially Variable Seismic Motions on Cable-Stayed Bridges

Efthymiou¹,

Cámara²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The spatial variability of the ground motion can be a key factor to the design of cable-stayed bridges to resist seismic actions due to the critical effect of the asynchronous movement that it introduces between the towers. Cable-stayed bridges are landmark structures consisting key parts of transportation networks and their integrity must be ensured even under extreme seismic events. This work examines the effect that spatially variable ground motions have on the towers of a cable-stayed bridge with 200 m main span. Two different orientations of the structure are examined in an attempt to shed light into the orientation-dependent seismic response of the towers. Additionally, three different propagation velocities of the seismic waves are adopted and the results are compared to those obtained under synchronous ground motions.

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Fundamental Mode Estimation for Modern Cable-Stayed Bridges Considering the Tower Flexibility

Abstract: This is the accepted version of the paper.This version of the publication may differ from the final published version. The design of cable-stayed bridges is typically governed by the dynamic response. This work Permanent repository link

Cited by 30 publications

References 15 publications

Deck–tower interaction in the transverse seismic response of cable-stayed bridges and optimum configurations

Deck–tower interaction in the transverse seismic response of cable-stayed bridges and optimum configurations

Design of hysteretic dampers with optimal ductility for the transverse seismic control of cable‐stayed bridges

The Effect of Multi-Angle, Spatially Variable Seismic Motions on Cable-Stayed Bridges

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