Nonlinear seismic response of a gravity dam under near-fault ground motions and equivalent pulses

Yazdani, Yadollah; Alembagheri, Mohammad

doi:10.1016/j.soildyn.2016.11.003

Cited by 41 publications

(16 citation statements)

References 38 publications

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“…And then the Bessel function is used to determine the reduction coefficient when Δ equals 0, and the relationship curves between the mutation factor Δ and the strength reduction factor k are plotted (Figures 15 and 16). It can be seen from the figures that after increasing the strength parameters at the dam foundation by 20%, the dynamic stability safety factor at the dam toe is equal to 2.58368, y = 0.001x 4 -0.010x 3 + 0.022x 2 Mathematical Problems in Engineering which is slightly larger than that with the parameters not increased (2.58089). And the dynamic stability safety factor at the dam heel is 2.58790, which is slightly greater than that with the parameters not increased (2.57759).…”

Section: Granite Sandstonementioning

confidence: 91%

“…rough the above analysis, it can be drawn that when the strength parameters at the dam foundation are decreased y = 0.002x 4 -0.015x 3 + 0.034x 2…”

Section: Sensitivity Analysis To the Strength Parameters Of Thementioning

confidence: 94%

“…e earthquake action is characterized by randomness, reciprocity, and persistence. e mechanism of a dynamic analysis problem is completely different from a static one, and there are many influencing factors that make the dynamic stability analysis of high concrete dams rather complicated [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Stability Discrimination Method for Concrete Dam under Complex Geological Conditions

Zhang

et al. 2019

Mathematical Problems in Engineering

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The instability of dams will bring immeasurable personal and property losses to the downstream, so it has always been a trendy topic worthy of investigation. Currently, the rigid body limit equilibrium method is the most commonly used method for the dynamic stability analysis of dams. However, under the action of earthquakes, the instability of the integral dam-foundation system threatens the safety of the dams and is of great concern. In this paper, a stability analysis method that can reflect the complex geological structural forms of dam foundations is proposed in this paper. The advantages are that this method deals with the difficulty in assuming sliding surfaces and the lack of quantitative criteria for the dynamic instability analysis of dams with complex geological structural forms of dam foundations. In addition, through the method, the sliding channels that may appear in the dam foundations can be automatically searched under random earthquake action, and the safety factors of the dynamic instability of dams be quantitatively obtained. Taking a high RCC gravity dam under construction in China as an example, the proposed method is applied to the three-dimensional finite element model of the dam-foundation system of this dam, and then the dynamic stability calculation is carried out. Through this method, the formation process of the dam foundation’s plastic zone and the failure of sliding channels with different strength reduction coefficients are studied on and analyzed detailedly, and the quantitative acquisition of the safety factors is realized. The results show that the method is reasonable and feasible, and helps provide a new idea and method for the dynamic stability analysis of dams.

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Section: Granite Sandstonementioning

confidence: 91%

“…rough the above analysis, it can be drawn that when the strength parameters at the dam foundation are decreased y = 0.002x 4 -0.015x 3 + 0.034x 2…”

Section: Sensitivity Analysis To the Strength Parameters Of Thementioning

confidence: 94%

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Dynamic Stability Discrimination Method for Concrete Dam under Complex Geological Conditions

Zhang

et al. 2019

Mathematical Problems in Engineering

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“…It is a well-shaped gravity dam that has been extensively studied in literature [39][40][41][42]. e Advances in Civil Engineeringdam is two-dimensionally modeled in a plane-stress manner along with its full reservoir utilizing the finite element method, as shown in Figure 1; the water-structure dynamic interaction is considered employing Eulerian-Lagrangian formulation.…”

Section: Dam Model and Ground Motion Selectionmentioning

confidence: 99%

Investigating Efficiency of Vector-Valued Intensity Measures in Seismic Demand Assessment of Concrete Dams

Alembagheri

2018

Advances in Civil Engineering

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e efficiency of vector-valued intensity measures for predicting the seismic demand in gravity dams is investigated. e Folsom gravity dam-reservoir coupled system is selected and numerically analyzed under a set of two-hundred actual ground motions. First, the well-defined scalar IMs are separately investigated, and then they are coupled to form two-parameter vector IMs. After that, IMs consisting of spectral acceleration at the first-mode natural period of the dam-reservoir system along with a measure of the spectral shape (the ratio of spectral acceleration at a second period to the first-mode spectral acceleration value) are considered. It is attempted to determine the optimal second period by categorizing the spectral acceleration at the first-mode period of vibration. e efficiency of the proposed vector IMs is compared with scalar ones considering various structural responses as EDPs. Finally, the probabilistic seismic behavior of the dam is investigated by calculating its fragility curves employing scalar and vector IMs considering the effect of zero response values.

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“…Yazdani and Alembagheri [25] proposed a seismic demand model of dams to estimate the vulnerability of the gravity dam subjected to the near-fault earthquakes. Yazdani et al [26] compared the dynamic characteristics of a gravity dam under forward-directivity (FD) and normal near-fault seismic records, and the impacts of FD records on the seismic demand analysis of structures were discussed. Pang et al [27] established a new reliability assessment method for the dam, and the random dynamic response of rockfill dam slopes under near-fault earthquakes was evaluated.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Response of a CC-RCC Combined Dam Structure under Oblique Incidence of Near-Fault Ground Motions

Zhang

et al. 2020

Applied Sciences

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The velocity pulse contained in near-fault ground motions have a tremendous impact on dam safety. Previous studies have mainly focused on the response of dams under near-fault seismic records without considering the obliquely incident seismic waves. In this study, the structure–soil interaction (SSI) is taken into consideration, and the nonlinear behavior of a conventional concrete roller-compacted concrete (CC-RCC) gravity dam under near-fault pulse records and non-pulse records is investigated with consideration of the obliquely incident P waves. On the basis of the dam site conditions, three groups of near-fault pulse records are chosen, and three corresponding non-pulse records are fitted by their acceleration response spectra. Combining with the viscous-spring artificial boundary, the wave input method is proposed to transform the near-fault seismic records into the equivalent nodal forces at the boundary of the foundation. The concrete damaged plasticity model is used for the nonlinear analysis. The results show that the pulse ground motions are more destructive than the non-pulse motions. The nonlinear behavior of the dam varies with the incidence angle of P waves and generally reaches a maximum at 60° and 75°, the worst damage occurs at the interface between different materials of the dam, and the spatial variation of its damage is very obvious under near-fault seismic records with various incidence angles. Therefore, the effect of the angle of obliquely incident seismic waves and near-fault pulse effect should be considered comprehensively in the seismic analysis of dams.

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Nonlinear seismic response of a gravity dam under near-fault ground motions and equivalent pulses

Cited by 41 publications

References 38 publications

Dynamic Stability Discrimination Method for Concrete Dam under Complex Geological Conditions

Dynamic Stability Discrimination Method for Concrete Dam under Complex Geological Conditions

Investigating Efficiency of Vector-Valued Intensity Measures in Seismic Demand Assessment of Concrete Dams

Nonlinear Dynamic Response of a CC-RCC Combined Dam Structure under Oblique Incidence of Near-Fault Ground Motions

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