Journal articles: 'Concrete gravity dam'

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Wen, Zhong Hua, and Juan Zhou. "Stability Analysis of Concrete Gravity Dam." Applied Mechanics and Materials 238 (November 2012): 252–55. http://dx.doi.org/10.4028/www.scientific.net/amm.238.252.

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The safety is first-class important event of the dam. The crash for the gravity dam usually causes due to slid, the slippery stable is a key problem of big dam. This paper checks the stability of one dam by rigid body limit equilibrium method and finite element technique. Rigid body limit equilibrium method is a kind of traditional stable analytical method, which is confirmed by factual engineering, the safe coefficient is always used to judge the big dam safety degree. The finite element technique is a method which is quickly developed in the calculator science and the basic theories of the rock soil mechanics. The paper compares the two methods and makes sure the fact that the finite element is more reasonable than rigid body limit equilibrium method for analyzing the stability of gravity dam.

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Ji, Dong Yu. "Three-Dimensional Finite Element Analysis for Concrete Gravity Dam of Shachang Reservoir." Applied Mechanics and Materials 488-489 (January 2014): 565–68. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.565.

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Through analyzing concrete gravity dam structures mechanical characteristics in construction process and operating process, this paper adopts finite element method to carry out structural analysis for concrete gravity dam of Shachang reservoir. Deducing distribution law of the dams stress and displacement in construction process and operating process. Analysis results show that, concrete gravity dam of Shachang reservoir is reasonable, it meets the requirements for design. The analysis results provide a certain reference for design and construction of concrete gravity dam structure.

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Lu, Lu, Xin Li, Jing Zhou, Genda Chen, and Dong Yun. "Numerical Simulation of Shock Response and Dynamic Fracture of a Concrete Dam Subjected to Impact Load." Earth Sciences Research Journal 20, no. 1 (April 30, 2016): 1–6. http://dx.doi.org/10.15446/esrj.v20n1.54133.

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<p>The shock response and dynamic fracture of concrete gravity dams under impact load are the key problems to evaluate the antiknock safety of the dam. This study aims at understanding the effects of impact shock on the elastic response and dynamic fracture of concrete gravity dams. Firstly, this paper uses acceleration records of a concrete gravity dam under impact to establish the correct way to determine the concrete gravity dam of the fundamental frequency and present cut sheets multi-degree-of-freedom dynamic modeling. Under strong impact loading, the constitutive relation of concrete gravity dam and the highest frequency of the impact are uncertain. So, the main advantage of this method is avoiding the use of elastic modulus in the calculation. The result indicates that the calculation method is a reliable computational method for concrete gravity dams subjected to impact. Subsequently, the failure process of dam models was numerically simulated based on ABAQUS commercial codes. Finally, this paper puts forward suggestions for future research based on the results of the analysis.</p>

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Zhang, Yan Yan, and Cai Ying Chen. "Temperature Stress Analysis for Concrete Dam of Jiangya Hydropower Station." Applied Mechanics and Materials 556-562 (May 2014): 683–86. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.683.

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Temperature is one of the main loads of concrete dam, adverse temperature load can lead to the dam body cracks, this paper study temperature load’s influence on concrete gravity dam. This paper use finite element method, it adopts finite element calculation software to establish concrete gravity dam’s finite element model of Jiangya hydropower station. Based on monitoring data of water temperature, air temperature, dam body temperature, foundation temperature about Jiangya hydropower station, calculates and analyzes temperature field of dam during operation period, researches stress variation law of dam under the influence of temperature field. The results showe that, temperature load has a great influence on the dam operation, but dam still meet code design requirements; when continuous high temperature during summer, dam should avoid operate under high water level; when continuous low temperature during winter, dam should avoid operate under low water level. Research results provide theoretical according for concrete gravity dam’s safe operation of Jiangya hydropower station.

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Li, Fen Hua, Fang Xing Xu, and Dong Hai Lu. "Upstream Slope Ratio Effects on the Heel Stress of Concrete Gravity Dam." Advanced Materials Research 1065-1069 (December 2014): 663–67. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.663.

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Heel is a critical area due to the high-gradient when the stress of a concrete gravity dam is analyzed. This article employed ANSYS, a kind of structure analysis software, to establish a two-dimensional model and to analyze the stress of a concrete gravity dam with Finite Element Method. Then the effects of upstream slope ratio on the stress of the dam heel in the operating conditions were researched and some valuable conclusions drawn from this paper can be adopted by the designer of concrete gravity dam.

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Jia, Chao, Feng Gao, and Yong Li. "Progressive Failure Research on Foundation Surface of Concrete Gravity Dam." Advanced Materials Research 163-167 (December 2010): 1038–43. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1038.

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Concrete dam safety is one of the hot issues in dam study with the increasing of dam’s scale and height. Sliding failure along foundation surface is a potential failure mode of concrete gravity dam, and this mode is relatively rare in practical engineering. Strength reduction method is used to analyze the progressive failure along foundation surface of concrete gravity dam, and the strength parameters of weak layer in the foundation surface are reduced to analyze the occurrence and development regularity of plastic zone. If the plastic zone of foundation surface is totally coalescent, the dam will slide along the foundation surface. To track this process, the failure path and the safety reserve coefficient would be determined. This result will provide certain scientific basis for anti-sliding stability analysis of concrete gravity dam.

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Wang, Zhi Bin, Feng Hai Ma, and Zhi Yu Zhou. "Seismic Analyses of 3D Fengman Concrete Gravity Dam." Advanced Materials Research 1065-1069 (December 2014): 586–89. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.586.

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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.

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Li, Lin Ke, Ai Jun Zhang, Jin Yu Liu, Chun Jiao Hou, and Hao Dong Li. "3D Numerical Simulation of Majiabian Concrete Gravity Dam." Applied Mechanics and Materials 90-93 (September 2011): 2624–32. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.2624.

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A new method that 3D numerical simulation combined with anti-cut stability analysis is employed to analyze the stability of Majiabian gravity dam, and the results of the analysis conform to the measured value. And this method can be used in analysis of congener gravity dam. When the results of 2D sliding stability analysis satisfy Code’s requirements, elastic material can be used in 3D numerical simulation. The results of water level sensitivity analysis and deformation modulus of its foundation sensitivity analysis indicates that this gravity dam is insensitive to water level; grouting method can be adopted to enhance its foundation. The results of abutment under tension stress analysis indicate that tension stress of abutment must be considered in high gravity dam design, and arch can be used for reducing the tension stress.

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Li, Bo, Li Li Liu, Da Zhi Li, and Jun Liang. "Chang Law Analysis of the Horizontal Displacement of the Arch Crest Dam Section of the Geheyan Concrete Gravity Arch Dam." Applied Mechanics and Materials 170-173 (May 2012): 2013–16. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2013.

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Monitoring data of the arch crown dam section of the Geheyan concrete gravity arch dam were qualitatively and quantitatively analyzed. The analysis results show that the measured data and year changes of the dam horizontal displacement are small, the influence of the water level and temperature on the arch crown dam section is normal, the influence of the aging on the dam horizontal displacement is little, and the aging component has become stable. Therefore, it can be shown that the arch crown dam section of the Geheyan concrete gravity dam is in elastic state, and the horizontal displacement is accord with general deformation law of concrete arch dams.

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Hovland, H. John, Edmund W. Medley, R. L. Volpe, Richard E. Goodman, and Charles S. Ahlgren. "Evaluating Safety of Concrete Gravity Dam on Weak Rock:Scott Dam." Journal of Geotechnical and Geoenvironmental Engineering 127, no. 10 (October 2001): 900–903. http://dx.doi.org/10.1061/(asce)1090-0241(2001)127:10(900).

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11

Wang, Shaowei, Chongshi Gu, and Tengfei Bao. "Safety Monitoring Index of High Concrete Gravity Dam Based on Failure Mechanism of Instability." Mathematical Problems in Engineering 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/732325.

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Traditional methods of establishing dam safety monitoring index are mostly based on the observation data. According to the performance of dam-foundation system under the experienced loads, alarm values and extreme values are predicted for monitoring quantities. As for some dams, the potential most unfavorable loads may not yet have appeared, and dam bearing capacity may also decrease over time. Therefore, monitoring index determined by these methods can not reflect whether the dam will break or not. Based on the finite element method, to study the progressive instability failures of high concrete gravity dams under the failure modes of material strength degradation or uncertainty and extreme environmental loads during operation, methods of strength reduction and overloading are, respectively, used. Typical stages in the instability processes are identified by evaluation indicators of dam displacement, the connectivity of yield zones, and the yield volume ratio of dam concretes; then instability safety monitoring indexes are hierarchically determined according to these typical symptoms. At last, a case study is performed to give a more detailed introduction about the process of establishing safety monitoring index for high concrete gravity dams based on the failure mechanism of instability, and three grades of monitoring index related to different safety situations are established for this gravity dam.

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Ansari, Md Imteyaz, Mohd Saqib, and Pankaj Agarwal. "Geometric Configuration Effects on Nonlinear Seismic Behavior of Concrete Gravity Dam." Journal of Earthquake and Tsunami 12, no. 01 (March 2018): 1850003. http://dx.doi.org/10.1142/s1793431118500033.

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The effects of geometric configuration on the seismic vulnerability of concrete gravity dam are discussed in the present study. The seismic vulnerability of concrete gravity dams has been represented through fragility curves obtained through incremental dynamic analyses by considering their nonlinear dynamic behavior. Five different geometries of concrete gravity dams are considered and fragility analyses are carried out on the basis of Incremental Dynamic Analyses. The effect of smoothening of re-entrant corners in the geometry of high concrete gravity dam is also presented as a possible solution.

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Li, Ze, and Li Xiang Zhang. "Seismic Damage Analysis of RCC Gravity Dams Using 3D Nonlinear FEM." Applied Mechanics and Materials 120 (October 2011): 397–402. http://dx.doi.org/10.4028/www.scientific.net/amm.120.397.

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The earthquake-resistance performance of gravity dam is an important indicator of dam safety. The earthquake-resistance performance of non-overflow monolith for Guanyinyan gravity dam is evaluated in this paper. First of all, the three-dimensional finite element model of dam is established by ABAQUS software. And then, the seismic response of gravity dam is analyzed by nonlinear finite element method, while the concrete damage plasticity constitutive model is adopted to describe the tensile characteristic of concrete. The seismic response and the damage evolution of dam are obtained. The results show that the dam has formed a crack-like band damage area at the end of earthquake, which are located in the dam along the dam-foundation boundary near the upstream face. At last, according to the results of simulation, the safety and the damage range are investigated.

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Esmaielzadeh, Sajad, Hassan Ahmadi, and Seyed Abbas Hosseini. "A SURVEY OF MATLAB EFFICIENCY IN DAMAGE DETECTION OF CONCRETE GRAVITY IN CONCRETE GRAVITY DAMS." IIUM Engineering Journal 20, no. 1 (June 1, 2019): 29–48. http://dx.doi.org/10.31436/iiumej.v20i1.970.

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Detection of damage in concrete gravity dams (CGDs) is one of the challenges that need to be overcome since dam failure may lead to irreversible consequences. This research aims to detect structural damage within CGDs by wavelet analysis. From a structural point of view, stiffness is an important factor in the dynamic behaviour of concrete gravity dam systems. Any sudden change in the stiffness leads to alteration in the dynamic response of the structures. The proposed analysis of such a condition will help to investigate the responses before and after the occurrence of any structural damage. The main contributions of this paper are to detect the existence of any damage in the dam structure and determine the damage location along the height of the dam. In order to achieve these purposes, three finite element models of the Pine Flat, Bluestone, and Folsom dams are chosen as case studies. These dams have been modelled for both intact and damaged states, and their geometrical, physical, and mechanical characteristics are defined by SAP2000 software. A series of modal analyses was performed to determine the frequencies and shapes of the structural motions. After reduction of the elasticity modulus by 20% and 50%, the Discrete Wavelet Transform (DWT) was applied to the difference between the intact and damaged observations. Then, the DWT outputs were analysed to get information about the existence of damage as well as its location in the dam structure. Overall, from the obtained results, the main finding of this study states that the location and severity of the structural damages have been efficiently detected according to the significant amplitude variations in DWT diagrams. ABSTRAK: Pengesanan kerosakan pada empangan graviti konkrit (CGDs) adalah salah satu cabaran yang perlu diatasi disebabkan kegagalan empangan yang boleh membawa kepada akibat buruk. Kajian ini bertujuan bagi mengesan kerosakan struktur dalam CGDs menggunakan analisis wavelet. Dari sudut pandang struktur, struktur yang kukuh adalah faktor penting dalam sifat dinamik sistem empangan graviti konkrit. Sebarang perubahan secara tiba-tiba pada struktur bangunan membawa kepada perubahan tindak balas dinamik struktur. Analisis yang dicadangkan terhadap keadaan ini membantu dalam memberi tindak balas sebelum dan selepas jika berlaku sebarang kerosakan struktur. Sumbangan utama kajian ini adalah bagi mengesan jika terdapat sebarang kerosakan pada struktur dalam empangan dan menentukan lokasi kerosakan sepanjang ketinggian empangan. Bagi mencapai matlamat ini, tiga model unsur terhingga daripada empangan Pine Flat, Bluestone dan Folsom telah dipilih sebagai kes kajian. Kesemua empangan ini dimodelkan bagi kedua-dua keadaan iaitu ketika baik dan rosak. Ciri geometri, fizikal dan ciri-ciri mekanikal juga telah ditakrif menggunakan perisian SAP2000. Satu siri model analisis telah dijalankan bagi menentukan frekuensi dan bentuk gerakan struktur. Selepas pengurangan modulus keanjalan sebanyak 20% dan 50%, Transformasi Wavelet Diskret (DWT) telah digunakan bagi mengesan perbezaan antara keadaan baik dan rosak. Kemudian, hasil dari DWT ini dianalisis bagi mendapatkan maklumat mengenai kewujudan kerosakan pada empangan dan juga lokasi kerosakan dalam struktur empangan. Secara keseluruhan, hasil kajian berjaya menentukan lokasi dan tahap kerosakan struktur dengan cekap mengikut variasi amplitud ketara dalam rajah DWT.

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Léger, P., and S. S. Bhattacharjee. "Seismic fracture analysis of concrete gravity dams." Canadian Journal of Civil Engineering 22, no. 1 (February 1, 1995): 196–201. http://dx.doi.org/10.1139/l95-018.

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Nonlinear seismic analyses of a 90 m high concrete gravity dam, assumed to be located in eastern Canada, have been conducted using a smeared crack finite element model. Reduced frequency-independent added matrices have been used to represent the hydrodynamic and foundation interaction effects. Parametric analyses have been performed to assess the effects of the initial conditions induced by severe winter temperature, and the effects of hydrodynamic and foundation interaction mechanisms, on the nonlinear seismic behaviour of the dam. Key words: gravity dams, nonlinear seismic response, finite element, crack propagation.

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PIRES, K. O., A. T. BECK, T. N. BITTENCOURT, and M. M. FUTAI. "Reliability analysis of built concrete dam." Revista IBRACON de Estruturas e Materiais 12, no. 3 (June 2019): 551–79. http://dx.doi.org/10.1590/s1983-41952019000300007.

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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.

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Yang, Lu, Dong Bo Liu, and Zhi Kun Wang. "Numerical Simulation Studies of the Gravity Dam of Magnesia Concrete." Applied Mechanics and Materials 501-504 (January 2014): 1973–76. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1973.

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The adding of magnesia expanding agent can effectively control the generation of concrete dam fissure, and can play the effect of simplifying the temperature control measure , shortening the time limit of the project , improving the economic benefits and so on . This study will use the Abaqus CAE software to analyze the gravity dam of magnesia concrete . Check the features of magnesia concrete by comparing the adding one and the no adding one , and summarize the results of the numerical value simulation and compile the software to provide the theoretical basis for the numerical value simulation of magnesia concrete dam.

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He, Gang, Biao Li, Xuben Wang, and Nuwen Xu. "Integrated Analysis of the Formation Mechanism of Cracks in a Concrete Dam Using Microseismic Monitoring and Numerical Simulation." Journal of Sensors 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/5720565.

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The dam of Guanyinyan hydropower station is composed of a concrete gravity dam in the left bank and a rockfill dam in the right bank. During the operation of the hydropower station, several surface cracks occurred in the concrete gravity dam, which threatened the stability of the dam. To evaluate the evolution trend of the cracks and forecast the potential risk of the dam, the microseismic (MS) monitoring technique and finite-element method were used. First, the concrete three-point bending field test was performed to prove the reliability of the MS technique in monitoring the concrete cracks. The MS monitoring results were consistent with the simulation results. Then, the MS monitoring system was installed in the dam body. By analysing the MS activities before and after the impoundment, the evolution trend of the cracks and potential risk of the dam were evaluated and forecasted. The simulation results were also consistent with the monitoring results. These results can provide significant references for the operation safety of the dam and also present a new thought for the risk evaluation of similar dam engineering.

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MARTT, D. F. "Austin Dam, Pennsylvania: The Sliding Failure of a Concrete Gravity Dam." Environmental and Engineering Geoscience 11, no. 1 (February 1, 2005): 61–72. http://dx.doi.org/10.2113/11.1.61.

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Mandal, Kalyan Kumar, and Damodar Maity. "Transient Response of Concrete Gravity Dam Considering Dam-Reservoir-Foundation Interaction." Journal of Earthquake Engineering 22, no. 2 (December 8, 2016): 211–33. http://dx.doi.org/10.1080/13632469.2016.1217804.

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Goodman, Richard E., and Charles S. Ahlgren. "Evaluating Safety of Concrete Gravity Dam on Weak Rock: Scott Dam." Journal of Geotechnical and Geoenvironmental Engineering 126, no. 5 (May 2000): 429–42. http://dx.doi.org/10.1061/(asce)1090-0241(2000)126:5(429).

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Huang, Shu Ping, Jian Yun Fu, and Yan Cai Li. "Temperature Control Measures Optimization of RCC Gravity Dam." Applied Mechanics and Materials 226-228 (November 2012): 1153–56. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1153.

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With the continuous development of dam construction technology, the RCC dam becomes one of the most popular types of dam in the world with its unique advantages. Temperature control measures research is one of the key issues of design and construction of mass concrete structures. How to choose the proper temperature control measures to prevent concrete cracks becomes the important problem of dam construction technology. In a RCC gravity dam, the climate environment is so severe that a single temperature control measure can’t meet the requirements of temperature control and crack prevention. In this paper, 3D FEM simulation analysis is used to calculate temperature field and thermal creep stress field during the whole construction process. According to the simulation results, the temperature control measures design of the dam has been comprehensively evaluated and the temperature control measures of this project have been put forward.

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Zeng, Gui Xiang. "Application of Digital Simulation Software ANSYS in Rolling Concrete Dams Construction Technology." Materials Science Forum 704-705 (December 2011): 352–57. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.352.

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Taking a large hydropower station in Xinjiang Autonomous Region as an example, and based on the limited unit method, the structure and seism forces features and response rules of rolling concrete gravity dam under different construction conditions were studied. The purpose for the paper is to understand dam working status under the different design conditions, and to evaluate anti-earthquake safety capability. It is proved that the present findings should play an important significance in the development of rolling concrete dam construction technology. Key words: Rolling Concrete Gravity Dams, Limited Unit Methods, Static Force Analysis, Dynamic Features.

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Sun, Dunben, and Qingwen Ren. "Seismic Damage Analysis of Concrete Gravity Dam Based on Wavelet Transform." Shock and Vibration 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/6841836.

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The key to the dam damage assessment is analyzing the remaining seismic carrying capacity after an earthquake occurs. In this paper, taking Koyna concrete gravity dam as the object of study, the dynamic response and damage distribution of the dam are obtained based on the concrete damage plastic constitutive model. By using time-frequency localization performance of wavelet transform, the distribution characteristics of wavelet energy for gravity dam dynamic response signal are revealed under the action of different amplitude earthquakes. It is concluded by numerical study that the wavelet energy is concentrated in low-frequency range with the improving of seismic amplitude. The ultimate peak seismic acceleration is obtained according to the concentration degree of low-frequency energy. The earthquake damage of the dam under the moderate-intensity earthquake is simulated and its residual seismic bearing capacity is further analyzed. The new global damage index of the dam is proposed and the overall damage degree of the dam can be distinguished using defined formula under given earthquake actions. The seismic bearing capacity of the intact Koyna dam is 591 gal considering the dam-water interaction and its residual seismic bearing capacity after simulating earthquake can be calculated.

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Xi, Nian Nian, Fu Guo Tong, Gang Liu, and Tao Zhong. "Finite Element Analysis of Dam Foundation Seepage Effect on Cutoff Wall Depth of Guxue Concrete Gravity Dam." Advanced Materials Research 1073-1076 (December 2014): 1729–32. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.1729.

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This paper is committed to analyze the results of numerical simulation in the dam foundation seepage field of Guxue concrete gravity dam with the finite element method. The results show that the cutoff wall depth of the Guxue dam foundation seriously impacts the seepage effect of cutoff wall. The cutoff wall initially becomes deeper, the reduction of seepage discharge is distinct to reach 24%, as the depth increases gradually, the seepage discharge reduces slowly and can only reach 7%. In a word, the cutoff wall depth of Guxue concrete gravity dam exists a reasonable value and the numerical result is15m in this paper.

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Aldemir, Alper, Baris Binici, Yalin Arici, Ozgur Kurc, and Erdem Canbay. "Pseudo-dynamic testing of a concrete gravity dam." Earthquake Engineering & Structural Dynamics 44, no. 11 (January 26, 2015): 1747–63. http://dx.doi.org/10.1002/eqe.2553.

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Donlon, William P., and John F. Hall. "Shaking table study of concrete gravity dam monoliths." Earthquake Engineering & Structural Dynamics 20, no. 8 (1991): 769–86. http://dx.doi.org/10.1002/eqe.4290200805.

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Zhang, Xin Zhong, Xiao Na Sun, and Ke Dong Tang. "Static and Dynamic Analysis of Concrete Gravity Dam by ANSYS." Applied Mechanics and Materials 438-439 (October 2013): 1334–37. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1334.

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Dam is the most important building in water conservancy, which generates enormously social and economic benefits in the national economy by providing green energy to all walks of the national daily life, and playing a important role in flood control for the safety of peoples lives and properties. However, as dam outburst will bring disastrous consequences to the downstream place, it is very important to ensure the safety of dam. By the large general software ANSYS for static analysis and the response spectrum analysis method for the dynamic analysis, this paper gives the security evaluation of a RCC gravity dam project, and provides some reference for similar engineering analysis.

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BURMAN, A., D. MAITY, S. SREEDEEP, and I. GOGOI. "LONG-TERM INFLUENCE OF CONCRETE DEGRADATION ON DAM–FOUNDATION INTERACTION." International Journal of Computational Methods 08, no. 03 (September 2011): 397–423. http://dx.doi.org/10.1142/s0219876211002472.

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The dam–foundation interaction behavior under the application of seismic load has been investigated in the present paper using finite element technique in the time domain. Since the dam face is in constant contact with water, concrete degradation due to hygromechanical loading is inevitable and should be considered in the analysis procedure. This ageing process of concrete leads to loss of stiffness and strength of the material. Therefore, to assess the behavior of the dam at a later stage of its life, it is important to determine the proper strength of the concrete at a certain age. An approach to include the time-dependent degradation of concrete owing to environmental factors and mechanical loading in terms of isotropic degradation index is presented. An iterative scheme has been developed to model the dam–foundation interaction effects of the coupled system. The strains and the displacements are observed to increase if the ageing procedure of the gravity dam is taken into account. The long-term behavior of the aged concrete gravity and foundation interaction has been observed by using a developed ageing model for concrete.

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Chen, Zhong Hui, Jing Jing Feng, Li Li, and He Ping Xie. "Fracture Analysis on the Interface Crack of Concrete Gravity Dam." Key Engineering Materials 324-325 (November 2006): 267–70. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.267.

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Some numerical parameters-sensitivity analysis has been conducted to evaluate the stability and propagation of the interface cracks at heel of concrete gravity dam. In this paper, utilizing the software ANSYS to simulate the stress and displacement fields of the tip of the interface cracks between concrete gravity dam and foundation, the stress intensity factor (SIF) of the interface crack is analyzed using facture mechanics. Three impacting factors have been discussed, such as the crack length, the angle of crack, and the water height. Critical length and loads of interface crack propagation are obtained using composite fracture criteria. The results indicate that the coarse interface retards the propagation of interface crack, and redounds to stability of gravity dam. It is found that the interface crack often propagates alone the interface between dam and foundation, simultaneously the branch crack kinks to foundation at the specific condition.

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Guo, Shengshan, Hui Liang, Yunrui Deng, Nan Wu, Deyu Li, Houqun Chen, and Aijing Zhang. "The Effect of Steel Reinforcement on Seismic Damage to Concrete Gravity Dams Based on Distributed-Steel Model." Journal of Earthquake and Tsunami 14, no. 02 (December 20, 2019): 2050010. http://dx.doi.org/10.1142/s1793431120500104.

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Tensile cracking at the position where geometry changes is a typical failure mode of gravity dams under strong earthquakes. Steel reinforcement has been proposed to reduce the degree of dam cracking. In this paper, a nonlinear model is presented to consider the interaction effect between the steel reinforcement and the dam concrete in a combined concrete damage model and distributed-steel model. In the model, a composite constitutive model of a steel reinforcement-concrete element is proposed. The approach can model the process of gradual degradation of the concrete loading capacity and load transfer to the steel reinforcement by establishing the concrete and steel models separately. Taking a typical gravity dam with positions where geometry changes upstream and downstream as a case study, the influence of steel reinforcement on seismic damage of the gravity dam is investigated. The analytical results show that the steel reinforcement strengthening prevents cracks thoroughly around the elevation of the downstream slope change. However, the cracking around the elevation of the upstream slope change extends to the downstream direction. This reflects the transfer of fracture energy release during the cracking process.

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Yu, He, Shouju Li, Yingxi Liu, and Changlin Chen. "Study on temperature distribution due to freezing and thawing at the Fengman concrete gravity dam." Thermal Science 15, suppl. 1 (2011): 27–32. http://dx.doi.org/10.2298/tsci11s1027y.

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Freezing and thawing damage is one of the major problems of the Fengman concrete dam. Based on the temperature records of the dam, appropriate heat transfer boundary conditions in the dam body are suggested. A three-dimensional finite element model is used to determine annual variation of temperature field of the dam as a case study. The deterioration problem of concrete dam owing to freezing and thawing effect is investigated.

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Hebbouche, Abdelhamid, Mahmoud Bensaibi, and Hussein Mroueh. "Seismic Risk Analysis of Concrete Gravity Dams under Near-Fault Ground Motions." Applied Mechanics and Materials 256-259 (December 2012): 2240–43. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.2240.

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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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Liu, Jin Bao, Jian Rong Xue, and Wei Zhu. "Damage Mechanism and Fracture Process of Concrete Gravity Dam under Earthquake Action." Advanced Materials Research 430-432 (January 2012): 142–45. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.142.

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Based on plastic-damage constitutive model of concrete, the developing process of damage domains is simulated for the earthquake analysis of concrete dam by taking account of the change of strain speed and stiffness degradation effect caused by material damage. The plastic-damage constitutive model is applied and the dam-reservoir dynamic interaction resulting from the transverse component of ground motion is modeled using the developed and generalized Westergaard formula added mass technique. Numerical simulation results show that the damaged domains mainly distribute at the change in geometry of upper part of the dam and vertical construction joints. The damaged domains of dam are same as the maximum tensile stress because the tensile strength of concrete is less its compress strength.

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Gimenes, Evandro, and Gabriel Fernández. "Hydromechanical analysis of flow behavior in concrete gravity dam foundations." Canadian Geotechnical Journal 43, no. 3 (March 1, 2006): 244–59. http://dx.doi.org/10.1139/t05-095.

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A key requirement in the evaluation of sliding stability of new and existing concrete gravity dams is the prediction of the distribution of pore pressure and shear strength in foundation joints and discontinuities. This paper presents a methodology for evaluating the hydromechanical behavior of concrete gravity dams founded on jointed rock. The methodology consisted of creating a database of observed dam behavior throughout typical cycles of reservoir filling and simulating this behavior with a distinct element method (DEM) numerical model. Once the model is validated, variations of key parameters including lithology, in situ stress, joint geometry, and joint characteristics can be incorporated in the analysis. A site-specific simulation of a typical reservoir cycle was carried out for Albigna Dam, Switzerland, founded on granitic rock, to assess the nature of the flow regime in the rock foundations and to evaluate the potential for sliding surfaces other than the damrock interface to develop. The factor of safety against sliding of various rock wedges of differing geometry present within the dam foundations was also evaluated using the DEM model and conventional analytical procedures. Estimates of crack propagation patterns and corresponding uplift pressures and factors of safety against sliding along the damrock interface obtained with the DEM were also compared with those from simplified procedures currently used in engineering practice. It was found that in a jointed rock, foundation uplift estimates after crack development obtained from present design guidelines can be too conservative and result in factors of safety that are too low and do not correspond to the observed behavior.Key words: hydromechanical, jointed rock, flow, dam design.

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Yu, Pei Si, and Wei Qiang Wang. "The Ultimate Seismic Capacity Research of Concrete Gravity Dam Considering the Initial Crack." Applied Mechanics and Materials 204-208 (October 2012): 2641–45. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2641.

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Based on the typical overflow dam section of Ahai gravity dam, the cracking calculation was conducted and the crack form was determined, referring to the experimental research result. Then the constraint-function contact algorithm in ADINA was used to study the stability of the upper free body subjected to an earthquake. The analysis results primarily show that the ultimate seismic capacity of Ahai gravity dam is an earthquake whose peak acceleration is between 3.4g and 3.8g.

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Bouaanani, Najib, Patrick Paultre, and Jean Proulx. "Dynamic response of a concrete dam impounding an ice-covered reservoir: Part II. Parametric and numerical study." Canadian Journal of Civil Engineering 31, no. 6 (December 1, 2004): 965–76. http://dx.doi.org/10.1139/l04-076.

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This paper presents a numerical and parametric study of the effect of an ice cover on the dynamic response of a concrete dam using the approach proposed in the companion paper in this issue. The method was programmed and implemented in a finite element code specialized for the seismic analysis of concrete dams. The 84-m-high Outardes 3 concrete gravity dam in northeastern Quebec was chosen as a model for this research. Some basic aspects of the numerical model are established in this paper and we show that the ice cover affects the dynamic response of the ice–dam–reservoir system. Main features of this influence are emphasized and discussed in a parametric study through the analysis of: (i) acceleration frequency response curves at the dam crest, (ii) hydrodynamic frequency response curves inside the reservoir, and (iii) the hydrodynamic pressure distribution on the upstream face of the dam. Key words: gravity dams, concrete dams, ice, reservoirs, mathematical models, ice–structure interaction, fluid–structure interaction, forced-vibration testing, finite elements modelling.

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Wang, Xiaoling, Hongling Yu, Peng Lv, Cheng Wang, Jun Zhang, and Jia Yu. "Seepage Safety Assessment of Concrete Gravity Dam Based on Matter-Element Extension Model and FDA." Energies 12, no. 3 (February 5, 2019): 502. http://dx.doi.org/10.3390/en12030502.

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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.

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Wang, Hai Bo. "Cracking Risk Analysis of Concrete Dam at Early Age under Concrete Fast Pouring Method." Applied Mechanics and Materials 638-640 (September 2014): 735–39. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.735.

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In order to speed up the progress of the concrete dam construction, the concrete thick layers and short time intervals fast pouring method is proposed. The temperature cracking and stress safety of the dam under concrete fast pouring method is a big trouble. From the concrete cracking safety point of view, a concrete gravity dam is introduced as a case study, the influence of different thickness of layers, different time intervals and different pouring temperature on the temperature and thermal stress characteristics of the concrete dam at the early age as well as the cracking risk of the concrete are deeply studied. According to the analysis, the corresponding cracking prevention technology is put forward. The research provides a technical support for establishing the concrete temperature control criteria and the relevant temperature control measures for the concrete fast pouring method.

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Liang, Hui, Shengshan Guo, Yifu Tian, Jin Tu, Deyu Li, and Chunli Yan. "Probabilistic Seismic Analysis of the Deep Sliding Stability of a Concrete Gravity Dam-Foundation System." Advances in Civil Engineering 2020 (December 8, 2020): 1–10. http://dx.doi.org/10.1155/2020/8850398.

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There are various uncertainties in the design, construction, and operation of dams. These uncertainties have an important impact on the seismic response and seismic safety evaluation of concrete dams. In this research, a typical nonoverflow monolith of a concrete gravity dam is selected as a case study for the sliding stability analysis. Based on the analysis and demonstration of parameter sensitivity of friction coefficients and cohesion and their influence on the deep antisliding stability of the dam-foundation system, the probabilistic seismic analysis of a gravity dam-foundation system is carried out through Monte Carlo analysis with a large sample number. Damage levels are defined based on the sliding instability failure mode along with the corresponding threshold values of the damage index. Thus, seismic fragility analysis is investigated, and seismic fragility curves are obtained for the vulnerability assessment under earthquake hazards. The overall seismic stability of the gravity dam is evaluated, which provides the basis for the seismic safety evaluation in the probabilistic framework.

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Lu, Xiang, Liang Pei, Jiankang Chen, Zhenyu Wu, and Chen Chen. "Research and Application of a Seismic Damage Classification Method of Concrete Gravity Dams Using Displacement in the Crest." Applied Sciences 10, no. 12 (June 16, 2020): 4134. http://dx.doi.org/10.3390/app10124134.

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Concrete gravity dams are one of the most common water retention structures, some of which are located in seismically active regions. Determination of damage level after earthquakes plays an important role in assessing the safety behavior of concrete dams. Compared with the traditional performance parameters obtained from numerical simulations, such as the damage coefficient, energy dissipation, failure modes, and stress state, etc., the displacement of dams can be acquired from daily monitoring data conveniently and quickly. It is of great significance for the rapid and effective evaluation of dam properties after earthquakes. The residual displacement in the concrete gravity dam crest was adopted as the performance parameter in the paper, and the linear mapping function between the residual displacement and the damage coefficient was established based on the concrete damaged plasticity model (CDP). Based on the traditional classification method with damage coefficient, a residual displacement-based seismic damage classification method with corresponding level limits was proposed. The seismic fragility analysis of Guandi concrete gravity dam was conducted as an example to illustrate the presented methodology. The results indicate that the proposed method is reasonable, effective, and can be easily applied to different projects after slight modifications.

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Rahman, Alaa Jabbar, Ali Majdi, and Wissam Khlaf Obied. "Evaluation of safety in arch dam using post analysis including inertia force and temperature variations of water." Technium: Romanian Journal of Applied Sciences and Technology 2, no. 1 (January 7, 2020): 56–65. http://dx.doi.org/10.47577/technium.v2i1.42.

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Dams considered as one if very important infrastructure, they are lifeline structures and have a vital role our economics and social life. A concrete gravity dam is one of wide used dam worldwide, it constructed from reinforced concrete and his typical cross section is triangular, the other type is arch section. A gravity dam can be combined with an arch dam into an arch-gravity dam for areas with massive amounts of water flow but less material available for a purely gravity dam. The inward compression of the dam by the water reduces the lateral (horizontal) force acting on the dam. Thus, the gravitation force required by the dam is lessened, i.e. the dam does not need to be so massive. The aim of this paper is to obtain a preliminary post analysis for an arch gravity dam by considering of typical applied loads that effects on it. In order to check and verify the dam and ensure the assumptions used during this process, the dam is analysed in different type of major effects such as own weight, water pressure, temperature and static load intertie generated from seismic load. These loads are presented in this paper in different cases, totally five cases combined between all these factors as explain in details in the section of methodology.To achieve the target of this study, modelling of an arch dam, reservoir and foundation provided by finite element using software ANSYS. An arch dam with height of 41.5 m is studied in this paper to simulate the reality of the future dam that will be erected as accurate as possible. The response of the dams is represented by the maximum displacement of it and also the stresses in each case. The results of all analysis were compared in the five cases mentioned above to determine the impact of each case as well as the worst case affecting the safety of the dam.

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43

Qiang, Sheng, Xiang Rong Wang, Zhi Qiang Xie, and Zhan Qiang Zheng. "The Parameter Inversion and Stress Simulation Analysis for High RCC Gravity Dam in Construction." Applied Mechanics and Materials 182-183 (June 2012): 1600–1604. http://dx.doi.org/10.4028/www.scientific.net/amm.182-183.1600.

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Before and after pouring the concrete for a dam, how to predict and obtain the accurate temperature and stress of the various parts of the dam, is the key to prevent cracks in concrete. The stresses calculated from the parameters of the laboratory under the ideal conditions have obvious difference with the value calculated from site measured strain. As for such problem, based on the measured temperature and strain data of rolled compact concrete gravity dam engineering, the thermal and mechanics parameters of the concrete materials are inversed. The dam stress of construction period is simulated and analyzed separately based on the site parameters and lab parameters. The results show that although the stress development law from different ways is near, their values are different obviously because of three aspects. The site measured values should be more real. So it is necessary to inverse the thermal and mechanics parameters according to the site measured data.

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Pan, Jianwen, Yuntian Feng, Feng Jin, Chuhan Zhang, and David Roger Jones Owen. "Comparison of different fracture modelling approaches to gravity dam failure." Engineering Computations 31, no. 1 (February 25, 2014): 18–32. http://dx.doi.org/10.1108/ec-04-2012-0091.

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Purpose – There is not a unified modelling approach to finite element failure analysis of concrete dams. Different behaviours of a dam predicted by different fracture methods with various material constitutive models may significantly influence on the dam safety evaluation. The purpose of this paper is to present a general comparative investigation to examine whether the nonlinear responses of concrete dams obtained from different fracture modelling approaches are comparable in terms of crack propagation and failure modes. Design/methodology/approach – Three fracture modelling approaches, including the extended finite element method with a cohesive law (XFEM-COH), the crack band finite element method with a plastic-damage relation (FEPD), and the Drucker-Prager (DP) elasto-plastic model, are chosen to analyse damage and cracking behaviour of concrete gravity dams under overloading conditions. The failure process and loading capacity of a dam are compared. Findings – The numerical results indicate that the three approaches are all applicable to predict loading capacity and safety factors of gravity dams. However, both XFEM-COH and FEPD give more reasonable crack propagation and failure modes in comparison with DP. Therefore, when cracking patterns are the major concern for safety evaluation of concrete dams, it is recommended that XFEM-COH and FEPD rather than DP be used. Originality/value – The comparison of cracking behaviours of concrete dams obtained from different fracture modelling approaches is conducted. The applicability of the modelling approaches for failure analysis of concrete dams is discussed, and from the results presented in this work, it is significant to consider the suitability of the selected fracture modelling approach for dam safety evaluation.

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45

Yamazaki, Shuhji. "The Constructing of Concrete Gravity Dam by Layer Method." Concrete Journal 23, no. 2 (1985): 13–20. http://dx.doi.org/10.3151/coj1975.23.2_13.

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Lakkundi, Manjunatha, and D. K. Paul. "Nonlinear Seismic Analysis of a High Concrete Gravity Dam." AMC Indian Journal of Civil Engineering 3, no. 1 (December 31, 2020): 7. http://dx.doi.org/10.17010/ijce/2020/v3i1/152718.

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Ali, Md Hazrat, M. R. Alam, M. N. Haque, and M. J. Alam. "Comparison of Design and Analysis of Concrete Gravity Dam." Natural Resources 03, no. 01 (2012): 18–28. http://dx.doi.org/10.4236/nr.2012.31004.

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Sadique, M. R., M. I. Ansari, and M. F. Athar. "Response study of concrete gravity dam against aircraft crash." IOP Conference Series: Materials Science and Engineering 404 (September 28, 2018): 012027. http://dx.doi.org/10.1088/1757-899x/404/1/012027.

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Banerjee, Arnab, D. K. Paul, and Arijit Acharyya. "Optimization and safety evaluation of concrete gravity dam section." KSCE Journal of Civil Engineering 19, no. 6 (January 21, 2015): 1612–19. http://dx.doi.org/10.1007/s12205-015-0139-0.

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Aniskin, N. A. "Temperature regime of a gravity dam from rolled concrete." Power Technology and Engineering 40, no. 1 (January 2006): 23–27. http://dx.doi.org/10.1007/s10749-006-0014-8.

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Journal articles on the topic 'Concrete gravity dam'

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