Effects of Core on Dynamic Responses of Earth Dam

Tsai, Pei-Hsun; Hsu, Sung‐Chi; Lai, Jiunnren

doi:10.1061/41049(356)2

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…In other research, the effect of a core on dynamic responses of the earth dam have been studied (Tsai, 2009). As a result, the initial natural frequency was close to 2.5 Hz for 3D analysis while the length-height ratio (g) was more than 4 so this influence could be neglected.…”

Section: Fundamental Frequencymentioning

confidence: 92%

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Review on Dynamic Behaviour of Earth Dam and Embankment During an Earthquake

et al. 2021

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The earth dam analysis under the strong seismic load like a destructive earthquake is one of the major topics with respect to the dynamical assessment. Damage control and the structural behaviour during an earthquake is a very important issue for an earthen dam. In this study, a comprehensive review is presented based on literature for dynamic analysis of earth dams. In this context, some significant factors are discussed such as plane stress, plane strain, data monitoring, application of finite-element method or finite-difference method, reinforcement, free vibration analysis, seismic cracks, liquefaction on dams, utilization of shaking table and centrifuge tests based on the small-scale physical modelling in order to validate any numerical analysis. To explain these parameters, case studies are discussed. It is observed that the earth dam structures had the integrated response to increasing the acceleration or displacement at the crest. Consequently, the interaction between the dam and reservoir also the foundation was a very effective factor to establish the nonlinear behaviour. It seems that the reinforced techniques are an essential approach to improve the structural response during an earthquake.

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Section: Fundamental Frequencymentioning

confidence: 92%

“…As a result, the deformation of the upstream Fig. 37 The first natural frequency verse length-height ratio (Tsai 2009) Fig. 38 The first natural frequency verse Width-height ratio (Tsai 2009) was greater than downstream according to reservoir interaction.…”

Section: Shaking Table and Centrifuge Testmentioning

confidence: 99%

Review on Dynamic Behaviour of Earth Dam and Embankment During an Earthquake

et al. 2021

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“…This research introduced two methods such ratio of the Fourier amplitude response spectrum (RFRS) and ratio of response spectrum (RRS) to compute the fundamental frequencies during a short earthquake, and results were similar in both methods. In other research, effect of core on dynamic responses of the earthen dam was studied (Tsai, Hsu, & Lai, 2009). Accordingly, the initial natural frequency was close to 2.5 Hz for 3D analysis while the length-height ratio (η) was more than four, so this influence can be neglected.…”

Section: Introductionmentioning

confidence: 98%

The Optimized Dynamic Behavior of Short Embankment Based on Frequency Performance

Gordan

Adnan

2015

International Journal of Geotechnical Earthquake Engineering

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Due to the performance of embankment under the earthquake, relative displacement at both edges of the crest is very important for body cracks. It can be computed by dynamic analysis. In this way, response spectrum analysis and Rayleigh damping coefficient are dependent factors to dominant frequency. Based on the new technology using advanced programs to compute frequency, free vibration analysis as the basic technique and considering of different vibration modes is accessible. This research tried to evaluate the distribution of dominant frequencies for short embankment (H=30 meter) using Finite-Element Method (ANSYS 13). To evaluate of the frequency, elasticity modulus ratio and foundation depth ratio were the main objectives. Both were defined by the ratio between the embankment and foundation. As a result, maximum and minimum vertical displacements were located on both slopes, and maximum horizontal displacement was exposed at the crest. The dominant frequency increased as the modulus ratio decreased. In addition, dominant frequency decreased as the depth ratio increased. The impact of the modulus ratio to enhance frequency was greater than the depth ratio. In terms of contributing engineering, the amplitude of the dominant frequency (Hz) was finally optimized for modulus ratios (0.25-1.00) and depth ratios (0.1-1.00). For critical situation, modulus ratio was more than three, and the depth ratio was half of the unit. More research about medium embankment is recommended.

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“…Tsai et al [10] studied the effect of clay core dimensions on the earth dam natural frequency. Using finite element software, they showed that as the width of core increases, the first mode frequency decreases.…”

Section: Introductionmentioning

confidence: 99%

Analytical estimation of natural frequency in earth dams with respecting to the foundation effects

Hasani

Ghanbari

Hosseini

2016

NMCE

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There are varieties of techniques for calculating natural frequency of the structures. Nevertheless, these equations are less developed in the geotechnical structures such as slopes, buttress group, dams, and retaining walls. In earth dams, with respecting to the dimensions and weight of dam, soil-structure interaction is of prime importance for finding seismic parameters including natural frequency, deformation, and other parameters. To accomplish this objective and the inclusion of foundation flexibility, dam foundation was simulated using transition spring. in this research an equation is presented for calculating natural frequency of earth dam using analytical methods. The advantages of this method include more accurate estimation of seismic parameters as well as considering the flexibility of earth dams' foundation. Riley approximation method and shear-free shape function were used in the mathematical solution steps and the trend of gaining the proposed equation. Finally, the results obtained from the proposed equation were compared to those of finite element software GeoStudio-2007[9] and the correlation of responses was observed.

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Effects of Core on Dynamic Responses of Earth Dam

Cited by 6 publications

References 1 publication

Review on Dynamic Behaviour of Earth Dam and Embankment During an Earthquake

Review on Dynamic Behaviour of Earth Dam and Embankment During an Earthquake

The Optimized Dynamic Behavior of Short Embankment Based on Frequency Performance

Analytical estimation of natural frequency in earth dams with respecting to the foundation effects

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