Seismic analysis of hydraulic structures affected by alkali-aggregate reaction: a case study

2001 ◽  
Vol 28 (2) ◽  
pp. 332-338 ◽  
Author(s):  
M Parvini ◽  
S Pietruszczak ◽  
V Gocevski
Keyword(s):  
Power Plant ◽  
Single Unit ◽  
Hydraulic Structure ◽  
Seismic Analysis ◽  
Numerical Procedure ◽  
Seismic Excitation ◽  
Hydraulic Structures ◽  
Seismic Load ◽  
Alkali Aggregate Reaction

This paper describes the results of numerical analysis of a hydraulic structure subjected to seismic load. The paper is divided into two main parts. First, a numerical procedure for the description of mechanical effects of alkali-aggregate reaction in concrete structures is briefly outlined. Subsequently, a single unit of the Beauharnois power plant, situated in Quebec (Canada), is analysed in the context of seismic excitation. The numerical simulations are aimed at assessing the dynamic stability of this unit and investigating the evolution of damage associated with inception of macrocracks.Key words: alkali-aggregate reaction, plasticity, seismic analysis, hydraulic structures.

Seismic Analysis for an Explosion-Proof Valve Used in Nuclear Power Plant

2017 ◽  
Author(s):  
Juan Luo ◽  
Jiacheng Luo ◽  
Lei Sun
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Seismic Analysis ◽  
Nuclear Safety ◽  
Seismic Load ◽  
Seismic Safety ◽  
Stress Evaluation ◽  
Safety Standards ◽  
Stress And Deformation

Nuclear class equipment should be assessed for seismic safety before they are used in nuclear power plant. According to nuclear safety codes and regulations, all seismic category I equipments shall be designed enduring safety shutdown earthquake (SSE). That is, the stress evaluation needs to be accomplished for those structures. For some components, the deformation evaluation needs to be performed as well to assure the function integrity of the equipment. In this paper, the seismic analysis for an explosion-proof valve used in nuclear power plant, which exactly belongs to seismic category I equipment, has been conducted based on finite element method. The natural frequency, vibration mode and seismic response of the structure have been obtained through calculation, and the stress and deformation under the combined loadings of gravity, internal pressure, blast and seismic load have been evaluated according to ASME AG-1. The bolts of the structure have been qualified according to ASME III-NF as well. The results show that the design of the explosion-proof valve is in compliance with the requirement of corresponding nuclear safety standards.

scholarly journals Improving the identity of historic city by considering hydraulic infrastructure (the case study: Qazvin city)

2019 ◽  
Author(s):  
Nasim Iranmanesh ◽  
◽  
Keyword(s):  
Hydraulic Structure ◽  
Underground Water ◽  
Hydraulic Structures ◽  
Urban Fabric ◽  
Hydraulic Infrastructure ◽  
Ancient Civilizations ◽  
Historic City ◽  
The City ◽  
Historic Cities

Recently the importance of maintaining of historic identity of the cities is an obvious matter in restoration of a city. Each city depends on its cultural perception and its wealth, tries to reserve and repair its cultural heritage. This matter has been done in many cities in the world and many historic urban fabrics have been restored and rehabilitated to be visited by many tourists to enjoy their atmosphere and physical and spiritual features. Iran is a country with limited water resources but in spite of this fact there are many ancient civilizations and old cities with valuable urban fabrics in them which have intellectual irrigation. The water of most cities of Iran mostly harvested from underground water by a technic which is called Qanat which irrigate city and farms. Water supplement in urban fabric and locating the hydraulic structure in cities had an important effect in forming the city which this impact shouldn’t be ignored in repairing or rehabilitation of urban fabric. In the other word hydraulic infrastructure of historic cities of Iran in hot and dry region is an important factor which shouldn’t forget during planning for rehabilitation. The route of water either underground route or surface water and also hydraulic structures which have been located in the path of water should be preserved. The case study is Qazvin city which its historic hydraulic infrastructure and hydraulic structures had an important effect in forming the city.

Assess of the Nuclear Power Plant Structures Residual Life and Earthquake Resistance

2013 ◽  
Vol 284-287 ◽  
pp. 1247-1250 ◽  
Author(s):  
Vlastislav Salajka ◽  
Petr Hradil ◽  
Jiri Kala
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
Seismic Analysis ◽  
Residual Life ◽  
Actual State ◽  
Response Analysis ◽  
Seismic Load ◽  
General View

The paper deals with the seismic analysis of safety related structures of an operating nuclear power plant. At present time the nuclear power plants of VVER-400/213 type operate for over thirty years and there are arising requirements to verify the actual state of structures in order to assess their residual life in general. A sophisticated computation model has been developed for the seismic structural analysis using the ANSYS program package. The model involves the complex of all constrained structures of two main production blocks with equipment. In order to get a general view at the seismic load effects, seismic response analysis has been performed using direct integration of equations of motion in 25 sec interval at 0.01 sec step with excitation described by accelerograms. Combinations of dead loads and seismic loads have been considered in the stress assessment of the structures. The results of the performed analyses form a base for residual life prediction of selected structures

METHODS OF FORECAST CALCULATION OF GROUND WATER BACKWATER IN THE ZONE OF HYDRAULIC STRUCTURES INFLUENCE

2020 ◽  
pp. 109-116
Author(s):  
N.P. KARPENKO ◽  
◽  
M.A. SHIRYAEVA
Keyword(s):  
Numerical Model ◽  
Computer Program ◽  
Ground Water ◽  
Programming Language ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Software Model ◽  
Computational Program ◽  
Specific Object ◽  
Zone Of Influence

The purpose of the work is to consider methods for calculating the forecast of groundwater backwater in the zone of influence of hydraulic structures. The analysis of analytical dependences of calculation of the forecast of groundwater backwater for various calculation schemes is carried out. For a homogeneous scheme of the geofiltration structure, a numerical model is proposed and a computational program for calculating the groundwater backwater is developed. It allows calculating the groundwater backwater from the channel at any time in the discrete mode. To simplify the solution of the problem of calculating the groundwater backwater, a computer program was created in the programming language Phyton Version 8.3 which quickly solves this hydrogeological problem. A possible range of geofiltration parameters is proposed for calculating the groundwater backwater near main channels. The adaptation and implementation of the software model was carried out for a specific object – the Bolshoy Stavropol channel-5, for which forecast calculations were made. The results of predictive calculations of groundwater backwater are the basis for the assessment of areas of possible flooding – the territory within which the level of ground water increases as a result of their backup by a hydraulic structure.

The Effect of Cutoffs on the Uplift Pressure Beneath the Hydraulic Structures Floor

2018 ◽  
Vol 6 (3) ◽  
pp. 20-28
Author(s):  
Faisal Al Tabatabaie ◽  
Dhabia Sabeeh Al Waily
Keyword(s):  
Potential Energy ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Outer Face ◽  
Analogue Model ◽  
Electrical Analogue ◽  
Uplift Pressure ◽  
Different Depths ◽  
The Stability ◽  
Critical Sections

The use of cutoffs underneath the hydraulic structures is considered a safe solution to ensure the stability of hydraulic structure against uplift pressure and piping phenomenon in addition to the sliding and overturning forces of the water. These cutoffs are used at critical sections underneath the floor of hydraulic structure to substitute with their depths the horizontal lengths of the creep line of the hydraulic structure base. In this paper, the experimental method- by using electrical analogue model- was carried out to plot the flow net and study the efficiency of the front and rear faces of the cutoffs for dissipating the potential energy of the percolating water underneath the floor of hydraulic structure. An electrical analogue model which was used in this study consists of twenty five models with different depths of upstream and downstream cutoffs. After plotting the flow net for all models, it is concluded that the efficiency of the inner sides are less than that of the outer sides which were investigated before in this topic of this work that both faces reduction values in the uplift pressure are considered the same, where the efficiency of the outer face of upstream cutoff is (70.35) % and for the inner face is (29.64)%, while for the downstream cutoff the efficiency for the outer face is (76.21)% and for the inner face is (23.79)% .

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