Investigation of the effect of reservoir bottom absorption on seismic performance of concrete gravity dams using sensitivity analysis

Khiavi, Majid Pasbani

doi:10.1007/s12205-015-1159-5

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…25 Pasbani Khiavi studied the sensitivity of seismic responses of a concrete gravity dam to the reservoir bottom absorption using Monte Carlo probability analysis and the LHS method. 26 The results of this study indicated the effect of a reservoir bottom on the seismic performance of the dam. Chiti et al used the subset simulation with Markov Chain and the LHS as an advanced reliability analysis tool to evaluate the probability of dam failure with the lowest number of samples.…”

Section: Monte Carlo Probabilistic Analysismentioning

confidence: 70%

Seismic Optimization of Concrete Gravity Dams Using a Rubber Damper

Khiavi¹,

Ghorbani²,

Rahmati³

2020

The International Journal of Acoustics and Vibration

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One of the major factors in an economic project of new concrete dams and safety valuation of available dams in seismic areas is the control and dissipation of the induced hydrodynamic pressure induced by dam and reservoir interaction. As one of the main control functions, dissipating the induced hydrodynamic pressure on the upstream face of the dam is considered in the evaluations. In this paper, the effects of a rubber damper as an isolation layer on the dam's seismic control have been investigated. For optimization of the rubber damper thickness and height, the Monte Carlo probabilistic analysis is used. The ANSYS program on the basis of finite element technique is applied for modeling and analysis. The Pine Flat dam in California, due to components of El Centro, San Fernando and North Ridge earthquake is modeled as a case study to evaluate the effect of upstream isolation layer on seismic control and optimization. The effect of the thickness and height of the rubber damper on reducing the responses is investigated and the optimum thickness and height are selected using sensitivity analysis for safe and economic design. The obtained results show the capability of the rubber damper in the seismic and hydrodynamic control of the sample model.

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Section: Monte Carlo Probabilistic Analysismentioning

confidence: 70%

Seismic Optimization of Concrete Gravity Dams Using a Rubber Damper

Khiavi¹,

Ghorbani²,

Rahmati³

2020

The International Journal of Acoustics and Vibration

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“…It was important to know the quantity of displacement in order to determine the probability of the gravity dam sliding on the base. The front displacement of the gravity dam was larger at full reservoir than when the reservoir was empty, according to a number of scientists [6,10,[14][15][16][38][39][40][41][42][43][44][45][46]. The possible explanation for this was due to the impact of hydrodynamic pressure, which was based on the use of numerous analytical models for different interactions between the surface of the items (dam, foundation, and reservoir), which would have an impact on the behavior of the gravity dam body where the horizontal displacement changes significantly.…”

Section: Displacement For Gravity Dammentioning

confidence: 99%

“…The research found that the gravity dam crest, when it reached a value of 7.5 cm during the earthquake depicted by the Koyna dam model, had a 50% chance of causing the highest displacement [47]. Also, the crest's highest displacement value was less than 26.5 cm [43]. Whereas researcher suggested, gravity dam pattern's highest displacement was 0.0293 m at 2.16 seconds towards the reservoir, which was a critical number in demonstrating the effect of contact (damreservoir) [42].…”

Section: Displacement For Gravity Dammentioning

confidence: 99%

Overall Review of Seismic Wave Affected on Gravity Dam

Jamel¹,

Irzooki²,

Al-Obaidi³

2021

IJDNE

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Under seismic activity, gravity dams may crack and slide, causing damage to their bodies, as well as losing structural strength and rigidity. Investigating the factors that affect seismic waves on the stabilization of gravity dams is focused on reviewing the most significant previous literature in the present study. The seismic that causes damage starts at the gravity dam's heel and progresses upstream; this damage was not affected by the type of foundation of gravity dam, not even material damping. Still, it was noticeably affected within the different frequencies and amplitudes. In contrast, the sliding is governed by the direction of the forces generated at a lower frequency value. Also, the maximum hydrodynamic pressure was observed beyond peak ground acceleration value, where its distribution was almost linear at 25% of reservoir depth, as the remaining lower part (represented by 75% of reservoir depth) shows a nonlinear inclination.

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“…The results show that cracks form at the crest and the hill of the dam. Pasbani Khiavi [14] investigated the reservoir bed characteristics effect on reducing the induced pressure in the reservoir. The results confirmed a high dependence of responses to the reservoir bottom absorption.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of the Modal Behavior of Concrete Gravity Dam by Using Finite Element Method

Jafari

Khiavi

2019

Civ Eng J

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Calculating the natural frequency of dams is an essential part of its seismic behavior analysis. Therefore, it is important to calculate the natural frequency. This paper aims simulation and analysis the finite element (FE) model of the Koyna concrete gravity as a case study. For the investigation of the suitable mesh size to achievement the grid independence, the element size considered as a variable parameter and calculated its optimized value by using the Response Surface Optimization (RSO) method. In the independent grid, the Error Contour utilized for controlling mesh quality, which indicates fast variations of the energy in the adjacent elements and can recognize parts of the model that has a high error in calculating responses. The modal response of the dam with a rigid and flexible foundation with and without mass were appraised. The results indicated that modal frequencies in the condition of with and without Pre-stress were different value in all cases. Moreover, the frequency of first four modes by increasing mass and decreasing the stiffness of foundation, frequencies in the case without initial condition (without Pre-stress) has a slightly increased and in the case with initial condition (Pre-stress) had considerable decrease.

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Investigation of the effect of reservoir bottom absorption on seismic performance of concrete gravity dams using sensitivity analysis

Cited by 16 publications

References 14 publications

Seismic Optimization of Concrete Gravity Dams Using a Rubber Damper

Seismic Optimization of Concrete Gravity Dams Using a Rubber Damper

Overall Review of Seismic Wave Affected on Gravity Dam

Parametric Study of the Modal Behavior of Concrete Gravity Dam by Using Finite Element Method

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