Transient stochastic analysis of nonlinear response of earth and rock-fill dams to spatially varying ground motion

Hacıefendioğlu, Kemal

doi:10.12989/sem.2006.22.6.647

Cited by 22 publications

(11 citation statements)

References 14 publications

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“…Probably because of the small effects, the analysis results have limitations, such as the fact that the analysis is elastic only, and that so few elements were used. In addition, in rigid systems, such as gravity dams, a recognised phenomenon is the pseudo-static component's contribution to the total response being greater than the dynamic and covariance components (Hacıefendiog lu, 2006). The pseudo-static responses are insignificantly affected by large coefficients of variation in the material parameters.…”

Section: Resultsmentioning

confidence: 99%

“…As several previous researchers have provided the formulation for random vibration theory for spatially varying ground motion (Chen, 1995;Dumanoglu and Soyluk, 2003;Hacıefendiog lu, 2006;Harichandran and Wang, 1990), this study considers only the required final equations. Assuming stationary excitation, the variance of the ith total response component may be defined as…”

Section: Random Vibration Formulationmentioning

confidence: 99%

“…This is accepted from the recognition that earth and rock fill dams experience different ground motions at their foundations. In recent years there have been numerous studies of the seismic behaviour of fill dams subjected to spatially varying ground motion (Alves, 2004;Basu et al, 2004;Chen and Harichandran, 2001;Dumanoglu and Severn, 1984;Hacıefendiog lu, 2006;Hacıefendiog lu, 2009;Haroun and Abdel-Hafiz, 1987;Maheri and Ghaffar-Zadeh, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Effect of material uncertainty on stochastic response of dams

Hacıefendioğlu

2010

Proceedings of the Institution of Civil Engineers - Geotechnica

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The present research considers the effect of uncertain material parameters on the stochastic dynamic response of an asphaltic lining dam-foundation system subjected to both stationary and non-stationary random excitation. The uncertain material parameters of interest are the shear modulus and mass density, which are modelled using a log-normal distribution. The Monte Carlo simulation method determines the stochastic seismic response of the dam-foundation system to spatially varying ground motion with uncertain material parameters. Consideration of the spatial variability of ground motion incorporates incoherence and wave passage effects from both stationary and non-stationary random excitations. A Heaviside modulating function is used throughout the study for the non-stationary responses. The results obtained indicate that variability of the shear modulus should be included in a stochastic dynamic analysis of an asphaltic lining dam-foundation system, but variability of the mass density can be neglected. Also, from the results, stationarity is a reasonable assumption for asphaltic lining dams in response to typical durations of strong shaking.NOTATION d lm distance between support points d L lm projection of d lm

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Section: Resultsmentioning

confidence: 99%

Section: Random Vibration Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of material uncertainty on stochastic response of dams

Hacıefendioğlu

2010

Proceedings of the Institution of Civil Engineers - Geotechnica

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“…In addition, the cohesion constant is 15 kN/m 2 and the angle of friction is equal to 20°for the saturated clay core. The selected, initial damping value for the analysis is 5% [34]. The finite-element model consists of 286 three-and four-node isoparametric finite elements for the dam-foundation system as shown in Fig.…”

Section: Applicationmentioning

confidence: 99%

Estimation of stochastic nonlinear dynamic response of rock-fill dams with uncertain material parameters for non-stationary random seismic excitation

2009

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This research investigates the effect of uncertain material parameters on the stochastic, dynamic response of a rock-fill dam-foundation system subjected to non-stationary random excitation. The uncertain material parameter of particular interest is the shear modulus, developed from a lognormal distribution model. The stochastic seismic response model of the dam-foundation system, with uncertain material parameters and subjected to random loads is the result of a Monte Carlo simulation method. The nonlinear behavior model arises from an equivalent linear method, which considers the nonlinear variation of soil shear modulus and soil damping as a function of shear strain. Specification of the non-stationary stochastic process arises from a simulation method, which generates artificial earthquake accelerograms obtained from the product of a deterministic function of time and a stationary process. The artificial earthquake ground acceleration records reflect the charac-K. Hacıefendioglu ( ) teristics of soft, medium and firm soil types. Comparison of the numerical results from these approaches provides stochasticity in earthquake seismic excitation and randomness in material parameter (shear modulus) cases. Further, the results indicate that both these cases generally influence the nonlinear dynamic response of rock-fill dams to a non-stationary seismic excitation.

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“…Jangid [11] investigated the stochastic response of a isolated bridge under non-stationary earthquake motion for different shapes of modulating functions. Haciefendioglu [12] performed stationary as well as transient stochastic response analyses for the considered dam types. A time dependent frequency response function was used throughout the study for transient stochastic responses.…”

Section: Introductionmentioning

confidence: 99%

Seismic behaviour of isolated multi-span continuous bridge to nonstationary random seismic excitation

Ateş

2011

Nonlinear Dyn

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This paper concentrates on the results of responses of a multi-span continuous bridge isolated with double concave friction pendulum bearings subjected to non-stationary random seismic excitation characterized by the incoherence, the wave-passage, and the site-response effects. The earthquake excitation is modelled as a non-stationary random process as uniformly modulated broad-band excitation. To perform the seismic isolation procedure, the double concave friction pendulum bearings which are sliding devices that utilize two spherical concave surfaces are placed at each of the six support points of the deck. The non-stationary response of the isolated bridge is compared with the corresponding stationary response in order to study the effects of non-stationary characteristics of the earthquake input motion. Solutions obtained from the stationary and non-stationary stochastic analyses for the isolated bridge to spatially varying earthquake ground motions are compared for the special cases of the earthquake ground motion model. The spatially varying earthquake ground motions are described stochastically based on an empirical coherency loss function and a filtered power spectral density function. The site effect is considered by a transfer function derived from one dimensional wave propagation theory. It is observed that the stationary assump-S. Ates ( ) tion is reasonable for the considered ground motion duration.

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Transient stochastic analysis of nonlinear response of earth and rock-fill dams to spatially varying ground motion

Cited by 22 publications

References 14 publications

Effect of material uncertainty on stochastic response of dams

Effect of material uncertainty on stochastic response of dams

Estimation of stochastic nonlinear dynamic response of rock-fill dams with uncertain material parameters for non-stationary random seismic excitation

Seismic behaviour of isolated multi-span continuous bridge to nonstationary random seismic excitation

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