scholarly journals Assessment on the Technical State of Spillway Concrete Gravity Dams in Lithuania

2021 ◽  
Vol 28 (1) ◽  
pp. 106-117
Author(s):  
Raimondas Šadzevičius ◽  
Rytis Skominas ◽  
Algirdas Radzevičius
Keyword(s):  
Concrete Structure ◽  
Protective Layer ◽  
Technical State ◽  
Reinforcement Corrosion ◽  
Gravity Dams ◽  
Concrete Corrosion ◽  
State Research ◽  
Concrete Gravity Dams ◽  
State Evaluation ◽  
Deterioration Process

Spillway concrete gravity dams are exposed by loads and environment causing deterioration process. The article presents the concrete structure deteriorations, defects and technical state evaluation results of 34 Lithuanian spillway concrete gravity dams performed in 2006–2018. The typical deteriorations are: in piers’– crumbled protective layer of concrete, its corrosion, reinforcement corrosion, cracks in concrete, chipped edges; in spillway constructions’– concrete corrosion, bio–corrosion, concrete corrosion caused by cavitation; in outflow constructions – concrete corrosion, bigger cracks and deformations. According to results of technical state research, it was found that only 3% (1 SCGD) dams are in good technical state, 27% (9 SCGD) – moderate, 47% (16 SCGD) – satisfactory, 12% (4 SCGD) – unsatisfactory and 12% (4 SCGD) – in critical state.

A Meso-Structure Analytical Model to Describe the Cracking Process due to Reinforcement Corrosion in Concrete Structure

2013 ◽  
Vol 444-445 ◽  
pp. 956-960
Author(s):  
Yi Tang Zhou ◽  
Luo Ke Li ◽  
Peng Cao ◽  
Yi Na Wang
Keyword(s):  
Corrosion Product ◽  
Growth Process ◽  
Concrete Structures ◽  
Protective Layer ◽  
Reinforcement Corrosion ◽  
Cracking Behavior ◽  
Cover Concrete ◽  
Deterioration Process ◽  
Cracking Process ◽  
Initial Cracks

The degradation of concrete structures due to steel reinforcement corrosion is a serious problem for durability and serviceability. Cracking behavior due to reinforcement corrosion is evaluated experimentally and analytically in this paper. In the experiments, in which corrosion was induced electronically, the structure proportion of corrosion product was analyzed. In the analysis, a micromechanical cracking mechanical analytic model, which considered the coupling effects of corrosion product and concrete protective layer was established. The initial cracks and crack growth process of smeared cracks in cover concrete were simulated and explored for the deterioration process of concrete structures due to corrosion expansion. It is indicated that the numerically predicted crack mode agrees well with the experimental results.

Application of Digital Simulation Software ANSYS in Rolling Concrete Dams Construction Technology

2011 ◽  
Vol 704-705 ◽  
pp. 352-357
Author(s):  
Gui Xiang Zeng
Keyword(s):  
Digital Simulation ◽  
Simulation Software ◽  
Construction Technology ◽  
Dynamic Features ◽  
Concrete Gravity Dam ◽  
Gravity Dams ◽  
Concrete Dam ◽  
Concrete Gravity Dams ◽  
Xinjiang Autonomous Region ◽  
Important Significance

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.

Seismic Analysis of Concrete Gravity Dams Considering Foundation Mass Effect

2018 ◽  
Vol 22 (12) ◽  
pp. 4988-4996 ◽  
Author(s):  
Erfan Asghari ◽  
Reza Taghipour ◽  
Mohsen Bozorgnasab ◽  
Mojtaba Moosavi
Keyword(s):  
Seismic Analysis ◽  
Mass Effect ◽  
Gravity Dams ◽  
Concrete Gravity Dams

Health State Evaluation of Continuous Girder Bridge Based on Fuzzy Analytic Hierarchy Process

2012 ◽  
Vol 178-181 ◽  
pp. 2285-2289
Author(s):  
Hai Tao Li
Keyword(s):  
Analytic Hierarchy Process ◽  
Technical State ◽  
Fuzzy Analytic Hierarchy Process ◽  
Health Evaluation ◽  
Health State ◽  
Fuzzy Evaluation ◽  
Analytic Hierarchy ◽  
State Evaluation ◽  
Degree Of Membership ◽  
Hierarchy Process

Based on fuzzy analytic hierarchy process, The model of bridge health evaluation is established using the quantification relations between the bridge technical state evaluation grade and degree of membership function of bridge health evaluation, making use of the computed result of various index of degree of membership value and weight, obtains all levels of fuzzy evaluation collection. According to the maximum membership principles to evaluate the technical state grade of bridge structure the corresponding level, and with its result to instruct the decision-making of bridge maintenance and strengthening.

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