Safety Evaluation of an Arch-Gravity Dam Based on a Small Displacement Hydromechanical Coupled Model

2021 ◽  
pp. 285-292
Author(s):  
Nuno M. Azevedo ◽  
Maria Luísa Braga Farinha ◽  
G. Freitas ◽  
João R. Almeida
Keyword(s):  
Safety Evaluation ◽  
Coupled Model ◽  
Gravity Dam ◽  
Small Displacement

Genetic Algorithm for Searching for Critical Slip Surface in Gravity Dams Based on Stress Fields

2013 ◽  
Vol 790 ◽  
pp. 146-149
Author(s):  
Jian Yun Chen ◽  
Shu Wang ◽  
Qiang Xu ◽  
Jing Li
Keyword(s):  
Genetic Algorithm ◽  
Slip Surface ◽  
Safety Evaluation ◽  
Fem Analysis ◽  
Stress Fields ◽  
Gravity Dam ◽  
Critical Slip Surface ◽  
Gravity Dams ◽  
Sliding Stability ◽  
Search Program

Currently, the safety evaluation of gravity dam concentrates on stress and anti-sliding stability of the dam. A lot of research shows that the upper area of the dam is one of the whole dams weakest areas during an earthquake and should be studied in details. In this study, the genetic algorithm and non-linear FEM analysis are combined, then a search program is written to search the critical slip surface in the dams upper area. Finally, the surface which has the least anti-sliding stability coefficient is obtained, the most dangerous slip surface and its anti-sliding coefficient as well as the corresponding time are acquired to evaluate the safety of the dam.

Seismic Analyses of 3D Fengman Concrete Gravity Dam

2014 ◽  
Vol 1065-1069 ◽  
pp. 586-589
Author(s):  
Zhi Bin Wang ◽  
Feng Hai Ma ◽  
Zhi Yu Zhou
Keyword(s):  
Seismic Response ◽  
Safety Evaluation ◽  
Gravity Dam ◽  
Concrete Gravity Dam ◽  
3D Fem ◽  
Element Analysis ◽  
Earthquake Loads ◽  
Nonlinear Seismic Response ◽  
Safe Side ◽  
Earthquake Action

In this paper, the new Fengman gravity dam is numerically simulated to study the seismic response and safety evaluation by considering the different strength grade concrete partition, corridor, a discharge hole and gate pier. A complex 3D FEM of a real overflow monolith was built by taking advantage of AutoCADand ANSYS, nonlinear seismic response was studied under earthquake loads. Numerical simulations show that acceleration, displacement and stresses of dam were obtained in a complex 3D FEM under seismic precautionary intensity of 7 degree earthquake loads, results compared with the dam simple models were on the safe side. Fengman dam was still safe under seismic precautionary intensity of 8 degree earthquake loads, so the dam had enough capacity to resist earthquake action. At the same time, it is concluded that 3D dynamic FEM is very important for safety evaluation of concrete gravity dam subjected to the earthquake. The research provides finite element analysis reference works for comprehensive governance and reconstruction of Fengman Hydropower Station.

scholarly journals Investigation on Seismic Damage Model Test of a High Concrete Gravity Dam Based on Application of FBG Strain Sensor

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Mingming Wang ◽  
Jianyun Chen ◽  
Hai Wei ◽  
Bingyue Song ◽  
Weirong Xiao
Keyword(s):  
Strain Gauge ◽  
Safety Evaluation ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Model Material ◽  
Gravity Dam ◽  
Scale Model ◽  
Dynamic Strain ◽  
Small Scale ◽  
Small Scale Model

A 203-m-high gravity dam being built in earthquake-prone areas needs to be investigated very carefully to determine its dynamic responses, damage mechanism, and safety evaluation. The dynamic characteristics, seismic responses, failure mode, and safety evaluation of the above structure are presented through dynamic fracture test for small-scale model on shaking table. Because the strength of the model material is very low, the traditional strain gauge is also not easy to be glued to the surface of model. It is difficult to measure the accurate strain data of small-scale model during testing. Therefore, Fiber Bragg Grating (FBG) strain sensor is presented to obtain the strain of small-scale model during testing, due to its high sensitivity. The dynamic strain and residual strain are obtained with the FBG sensors embedded in model. The FBG sensor is adhered to model material completely and shows advantages of ease for installation, high sensitivity, and reliability compared with traditional resistance strain gauge. The model during testing is submitted with earthquake wave from the Chinese Code. In the experiment, the peak ground acceleration (PGA) of the first crack in the model indicates the safety level of the gravity dam. The crack locations and forms determine the damageable part of gravity dam under intense earthquake. After the final analysis, the safety evaluation result of the gravity dam under strong earthquake is given in order to guide the implementation of the project.

Study on Seismic Safety Evaluation of RCC Gravity Dam Based on Strength

2014 ◽  
Vol 501-504 ◽  
pp. 1493-1497
Author(s):  
Shu He Wang ◽  
Ji Yuan ◽  
Rui Guo Ma ◽  
Ju Bing Zhang
Keyword(s):  
Finite Element ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Safety Evaluation ◽  
Time History ◽  
Element Model ◽  
Gravity Dam ◽  
Seismic Safety ◽  
Finite Element Software ◽  
Three Dimensional Finite Element

According to No.3 dam section of Dahuaqiao gravity dam, a three-dimensional finite element model is built by finite element software ANSYS. Mechanics of materials method, response spectrum method and time history analysis method are employed to analyze the strength of the dam section. Results show that the stress of dam toe, dam heel and downstream fold slope are relatively high and stress concentration emerges in those positions. The phenomenon indicates that these areas are vulnerable under the earthquake and precautions must be taken. But under the designed earthquake, the maximum stress of the dam section is below the allowable stress, representing the dam is in a safe state and the strength requirement is satisfied.

Optimization and safety evaluation of concrete gravity dam section

2015 ◽  
Vol 19 (6) ◽  
pp. 1612-1619 ◽  
Author(s):  
Arnab Banerjee ◽  
D. K. Paul ◽  
Arijit Acharyya
Keyword(s):  
Safety Evaluation ◽  
Gravity Dam ◽  
Concrete Gravity Dam

Small Displacement Coupled Analysis of Concrete Gravity Dam Foundations: Static and Dynamic Conditions

2016 ◽  
Vol 50 (2) ◽  
pp. 439-464 ◽  
Author(s):  
Maria Luísa Braga Farinha ◽  
Nuno Monteiro Azevedo ◽  
Mariline Candeias
Keyword(s):  
Gravity Dam ◽  
Coupled Analysis ◽  
Small Displacement ◽  
Concrete Gravity Dam ◽  
Dynamic Conditions ◽  
Dam Foundations
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