scholarly journals The Investigation of Effective Parameters on the Stability of Concrete Gravity Dams with Case Study on Folsom, Blue Stone, and Pine Flat Dams

2014 ◽  
Vol 2 (5) ◽  
pp. 167-173
Author(s):  
Elyas behradimehr ◽  
afshin mansouri ◽  
babak aminnejad ◽  
mohammad ali barkhordari bafghi
Keyword(s):  
Effective Parameters ◽  
Gravity Dams ◽  
Blue Stone ◽  
Concrete Gravity Dams ◽  
The Stability

scholarly journals Reliability analysis of built concrete dam

2019 ◽  
Vol 12 (3) ◽  
pp. 551-579
Author(s):  
K. O. PIRES ◽  
A. T. BECK ◽  
T. N. BITTENCOURT ◽  
M. M. FUTAI
Keyword(s):  
Structural Reliability ◽  
Failure Modes ◽  
Design Parameters ◽  
Concrete Gravity Dam ◽  
Gravity Dams ◽  
Deterministic Method ◽  
Concrete Dam ◽  
Case Study Analysis ◽  
Concrete Gravity Dams

Abstract The conventional design of concrete gravity dams still follows the deterministic method, which does not directly quantify the effect of uncertainties on the safety of the structure. The theory of structural reliability allows the quantification of safety of these structures, from the quantification of the inherent uncertainties in resistance and loading parameters. This article illustrates application of structural reliability theory to the case study analysis of a built concrete gravity dam. Results show that reliability of the built structure is greater than that of the designed structure. The study compares reliability for design conditions, with the corresponding safety coefficients, illustrating a lack of linearity between safety coefficients and reliability. Furthermore, the study shows which are the failure modes and the design parameters with greater influence on dam safety.

scholarly journals Three Dimensional Epidemic Model with Non-monotonic Incidence and Saturated Treatment: A Case Study of SARS Infection of Hong Kong 2003 Scenario

2021 ◽  
Author(s):  
Uttam Ghosh ◽  
Susmita Sarkar ◽  
Jayanta Kumar Ghosh
Keyword(s):  
Hong Kong ◽  
Three Dimensional ◽  
Threshold Value ◽  
Effective Parameters ◽  
Cure Rate ◽  
The Stability ◽  
Necessary And Sufficient ◽  
Saturated Treatment ◽  
Disease Free

Abstract In this paper, we have proposed a mathematical compartmental model with non-monotonic incidence and saturated treatment and we have validated the model with SARS infection in Hong Kong, 2003. We have analysed the stability of disease free and endemic equilibria as well as different bifurcations. We have shown that the epidemic disappears if the cure rate of treatment crosses a threshold value. We have obtained a necessary and sufficient condition for backward bifurcation, which shows the basic reproduction number less than unity is not sufficient to eradicate the disease completely. Saddle-node and Hopf bifurcation with respect to awareness factor have been investigated, which shows that the awareness factor is effective to change the disease dynamics. The model has been fitted to SARS cases in Hong Kong. The most effective parameters for controlling infections have been identified through sensitivity analysis. Moreover, we have investigated how the number of infected cases reduces if there was some vaccination polices in SARS infection. Finally, the model has been also used as an optimal control problem as vaccination and treatment controls are time dependent functions.

scholarly journals Seepage Safety Assessment of Concrete Gravity Dam Based on Matter-Element Extension Model and FDA

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 502 ◽  
Author(s):  
Xiaoling Wang ◽  
Hongling Yu ◽  
Peng Lv ◽  
Cheng Wang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Safety Assessment ◽  
Flood Control ◽  
Gravity Dam ◽  
Concrete Gravity Dam ◽  
Gravity Dams ◽  
Concrete Gravity Dams ◽  
Extension Model ◽  
Infrastructure Project ◽  
The Stability ◽  
Criteria Importance

As an important infrastructure project, the concrete gravity dam plays an extremely important role in hydropower generation, irrigation, flood control, and other aspects. Seepage is an important factor affecting the stability of concrete gravity dams. Seepage safety assessment is of great significance to the safe operation of the dams. However, the existing seepage safety assessment models are not dynamic, and the correlation among indicators is often neglected and the overall seepage safety of the concrete gravity dams has not been considered. To solve these problems, this research proposes a dynamic matter-element extension (D-MEE) model. First, the D-MEE model is established through adroit integration of the matter-element extension (MEE) model and functional data analysis (FDA). Second, a dynamic criteria importance through the intercriteria correlation (D-CRITIC) method that can effectively consider the correlation among indicators is proposed to determine the weights. Third, the influence of different dam blocks on the overall seepage safety status is considered by constructing a spatial weight matrix. Finally, the proposed method is applied to the concrete gravity dam X in southwest China. The results show that the proposed method is effective and superior to the existing evaluation methods of seepage safety.

Seismic Risk Analysis of Concrete Gravity Dams under Near-Fault Ground Motions

2012 ◽  
Vol 256-259 ◽  
pp. 2240-2243
Author(s):  
Abdelhamid Hebbouche ◽  
Mahmoud Bensaibi ◽  
Hussein Mroueh
Keyword(s):  
Seismic Vulnerability ◽  
Human Life ◽  
Ground Motions ◽  
Probabilistic Method ◽  
Gravity Dams ◽  
Seismic Risk Analysis ◽  
Near Fault ◽  
Concrete Gravity Dams ◽  
Financial Losses

There are a large number of concrete dams worldwide. Some of the dams are in areas prone to seismicity and were built many years ago with minimal consideration to seismic loads. Dam safety during and after an earthquake, is the aim of the present study. The failure of a dam during an earthquake will be catastrophic in terms of human life and financial losses. In the present work, an analytical fragility analysis was performed in order to characterize the seismic vulnerability of concrete gravity dams by using a probabilistic method to model sources of uncertainty that could impact dam performance. The assessment of the seismic vulnerability of concrete gravity dams under near-fault ground motions was performed to assess their performance against seismic hazards. A case study was considered, it is about the dam of Oued el Fodda on the Oued Chelif River, West Algeria. This dam was designed in the early 1930s.

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