Seismic response evaluation of bridges under differential ground motion: a comparison with the new Algerian provisions

Benmansour, Nassima; Djafour, Mustapha; Bekkouche, Abdelmalek; Zendagui, Djawad; Benyacoub, Abdelhakim

doi:10.1080/19648189.2012.681951

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…Using eqns (6) and 7the stationary stochastic vector process g t j k n In this paper, we considered a linear dynamic analysis. A finite element model in 3D was created using a finite element code (see Fig.…”

Section: Spatial Ground Motion Modelmentioning

confidence: 99%

“…Konakli and Der Kiureghian [4,5] presented a simulation of the seismic ground motions by two approaches: The conditional approach where the simulated motion is conditioned by an observed acceleration at a site and the unconditional approach where the ground motion is compatible with an estimated spectral density function The work of Benmansour et al [6][7][8] evaluated the method proposed by the RPOA (the Algerian bridge seismic regulation code) and compared it with more refined approaches and with the provisions of EC8. They have developed a method of generating of asynchronous seismic ground motion in the sense that the displacement signals can be obtained directly without going through the double integration.…”

Section: Introductionmentioning

confidence: 99%

“…be simulated by the following series as N → ∞[6,8] represents the number of the frequency step ∆ω needed to reach the upper cut-off frequency ω u .The φ (9) are n sequences of independent random phase angles distributed uniformly over the interval 0 Finite element model of railway bridge…”

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confidence: 99%

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Impact of spatial variability of earthquake ground motion on seismic response of a railway bridge

Derbal¹,

Benmansour²,

Djafour³

2017

Int. J. CMEM

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This paper studies the impact of spatially varying ground motions on the responses of a railway bridge. The evaluation of the seismic hazard for a given site is to estimate the seismic ground motion at the surface. This is the result of the combination of the action of the seismic source, which generates seismic waves, the propagation of these waves between the source and the site, and the local conditions of the site. Firstly, the seismic ground motions are modelled by assuming the base rock motions of the same intensity and modelling them with a filtered Tajimi-Kanai power spectral density function and a spatial ground motion coherency loss function. Then, the power spectral density function of ground motion on surface is derived by considering the site amplification effect based on the one-dimensional seismic wave propagation theory. A comparison between the bridge responses to uniform ground motion, to spatial ground motions with and without considering local site effects is established. Discussions on the seismic ground motion spatial variability and local site conditions effects on structural responses of railway bridge are made.

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Section: Spatial Ground Motion Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of spatial variability of earthquake ground motion on seismic response of a railway bridge

Derbal¹,

Benmansour²,

Djafour³

2017

Int. J. CMEM

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“…For multi-scale structures like bridges, the spatial variability of seismic ground motion can significantly affect the seismic response generated internal forces. Therefore, the assumption of uniform ground motion at all supports of a multi-scale structure cannot be considered valid [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the spectral representation method described by Deodatis [19]. Benmansour et al [3] have proposed a technique for simulating spatially variable seismic motions. This method is based on a target earthquake record or an artificial seismic signal.…”

Section: Introductionmentioning

confidence: 99%

Impact of Local Site Conditions on Simulation of Non-stationary Spatial Variable Seismic Motions

Benmansour

Derbal²,

Djafour

et al. 2021

Period. Polytech. Civil Eng.

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It is commonly accepted that multi-scale structures are subject to spatially variable seismic motions. This spatial variability of seismic motions is described by different intensities at different locations due to the coherency loss effect, wave passage effect and local site conditions. For multi-scale structures, the estimation of seismic excitations must consider these factors. Often, the influence of the spatial variability of seismic motion on the dynamic response of structures is performed by neglecting the site effect. In several cases, it has been observed that the high intensities of seismic motion are caused by the site amplification besides coherency loss and wave passage effects. This study aims to analyze the impact of local site conditions on seismic motions. For this purpose, a method of simulation of spatially variable seismic motions is performed. The seismic signals on the bedrock are defined by considering a target power spectral density and a coherency loss model. According to the seismic wave propagation theory, the projection of these seismic motions on the surface is realized. The results of this study show that neglecting the local site conditions induces an undervaluation of spatially variable seismic excitations.

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Spatial Variability of Ground Motion: Seismic Analysis

Berrah¹,

Zendagui²,

Djafour³

2015

Encyclopedia of Earthquake Engineering

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Seismic response evaluation of bridges under differential ground motion: a comparison with the new Algerian provisions

Cited by 7 publications

References 16 publications

Impact of spatial variability of earthquake ground motion on seismic response of a railway bridge

Impact of spatial variability of earthquake ground motion on seismic response of a railway bridge

Impact of Local Site Conditions on Simulation of Non-stationary Spatial Variable Seismic Motions

Spatial Variability of Ground Motion: Seismic Analysis

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