Seismic behavior and capacity/demand analyses of three multi-span simply supported bridges

Saadeghvaziri, M. Ala; Yazdani-Motlagh, A

doi:10.1016/j.engstruct.2007.02.017

Cited by 33 publications

(12 citation statements)

References 7 publications

(9 reference statements)

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“…The nonlinear FE models can provide valuable insight into local behaviour of structural elements; however, application of such models for collapse analysis of a cable stayed bridge can be computationally expensive and time consuming. Accordingly, in this study the demand-tocapacity ratio (DCR) is introduced as the ratio of existing stress to the yield stress of the materials DCR values are employed to determine whether the material nonlinearities have occurred or still the structural components are within their elastic range (Saadeghvaziri and Yazdani-Motlagh 2008). The DCR indices calculated for cables, deck and pylons provide a rational basis to determine whether considering material nonlinearity at global level is required or it can be ignored.…”

mentioning

confidence: 99%

A Study on Potential Progressive Collapse Responses of Cable-Stayed Bridges

Aoki

Valipour

Samali

et al. 2013

Advances in Structural Engineering

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In this paper, a finite element (FE) model for a cable-stayed bridge designed according to Australian standards is developed and analysed statically and dynamically with and without geometrical nonlinearities. The dynamic amplification factor (DAF) and demand-to-capacity ratio (DCR) in different structural components including cables, towers and the deck are calculated and it is shown that DCR usually remains below one (no material nonlinearity occurs) in the scenarios studied for the bridge under investigation, however, DAF can take values larger than two. Moreover, effects of location, duration and number of cable(s) loss as well as effect of damping level on the progressive collapse resistance of the bridge are studied and importance of each factor on the potential progressive collapse response of the bridgeis investigated.

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mentioning

confidence: 99%

A Study on Potential Progressive Collapse Responses of Cable-Stayed Bridges

Aoki

Valipour

Samali

et al. 2013

Advances in Structural Engineering

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“…The pounding phenomenon of bridges in earthquakes is of great interest in science and engineering. The pounding phenomenon induced by horizontal earthquake between an abutment and bridge deck or between two adjacent bridge decks has been widely investigated in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Various pounding models [1][2][3][4][5] have been carried out to calculate the pounding force and the effects of pounding on bridge dynamic responses [6][7][8][9] in order to reduce the negative side of pounding [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Transient responses of girder bridges with vertical poundings under near‐fault vertical earthquake

Yang

Yin

2015

Earthq Engng Struct Dyn

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SUMMARYPrevious studies on pounding responses of bridge structures mainly focus on the horizontal pounding between adjacent structures. However, the vertical pounding responses of bridge are rarely studied. The aim of this paper is develop a theoretical approach to investigate the transient behavior of continuous bridge under near-fault vertical ground motions. The transient behavior of bridge manifests as the earthquake-induced response wave and pounding-induced response wave travel throughout bridge. Based on a new continuous model of beam-spring-rod, the theoretical solution of bridge responses involving multiple vertical poundings is derived by the expansion of transient wave functions in a series of eigenfunctions. A new theoretical solving approach of the multiple vertical pounding forces is presented based on the transient internal force on the contact surface of the girder and bearing. The numerical results show that the present method can reasonably capture the propagations of the earthquake-induced response wave and pounding-induced response wave. The calculations of pounding force by the present method are convergence of the time-step size and truncation number of wave modes. As the effect of transient wave is taken into account, the numerical results show several transient phenomena involving the vertical pounding, the high pounding force, the multiple-pounding phenomenon, the vertical separation of girder from the bearing, the dependence of poundings on earthquake period and the narrow period window of poundings.

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“…Evidently, the dynamic response characteristic and the stability of the moving trains over bridges shaken by earthquakes have become a subject of great concern for the railway engineers [8][9][10][11], especially in those countries that are earthquakeprone [12][13][14]. In the study by Miura [15], the emphasis was placed on the earthquake-induced displacement of track and structures, as well as the damage of trains caused by earthquake excitations, rather than on the dynamic stability of trains during an earthquake.…”

Section: Introductionmentioning

confidence: 99%

Random Vibration Analysis of Train Moving over Slab Track on Bridge under Track Irregularities and Earthquakes by Pseudoexcitation Method

Zeng

Zhu

et al. 2015

Discrete Dynamics in Nature and Society

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This paper investigates the random vibration and the dynamic reliability of operation stability of train moving over slab track on bridge under track irregularities and earthquakes by the pseudoexcitation method (PEM). Each vehicle is modeled by multibody dynamics. The track and bridge is simulated by a rail-slab-girder-pier interaction finite element model. The coupling equations of motion are established based on the wheel-rail interaction relationship. The random excitations of the track irregularities and seismic accelerations are transformed into a series of deterministic pseudoexcitations by PEM. The time-dependent power spectral densities (PSDs) of the random vibration of the system are obtained by step-by-step integration method, and the corresponding dynamic reliability is estimated based on the first-passage failure criterion. A case study is then presented in which a high-speed train moves over a slab track resting on a simply supported girder bridge. The PSD characteristics of the random vibration of the bridge and train are analyzed, the influence of the wheel-rail-bridge interaction models on the random vibration of the bridge and train is discussed, and furthermore the influence of train speed, earthquake intensity, and pier height on the dynamic reliability of train operation stability is studied.

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Seismic behavior and capacity/demand analyses of three multi-span simply supported bridges

Cited by 33 publications

References 7 publications

A Study on Potential Progressive Collapse Responses of Cable-Stayed Bridges

A Study on Potential Progressive Collapse Responses of Cable-Stayed Bridges

Transient responses of girder bridges with vertical poundings under near‐fault vertical earthquake

Random Vibration Analysis of Train Moving over Slab Track on Bridge under Track Irregularities and Earthquakes by Pseudoexcitation Method

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