It resists the forces exerted upon it mainly due to shear strength of soil. Many researchers have conducted comprehensive experimental and numerical investigations of civil structures response to blast loading. However, corresponding studies of concrete gravity dams are limited. However, concrete gravity dams are preferred these days and mostly con structed.
The water contained in the reservoir is considered a weakly compressible, inviscid fluid. Gravity dams may be classified by plan as straight gravity dams and curved gravity. Modelling and apply pushover and cyclic load test on beam column by abaqus and get hysteresis loop duration. An arch dam that is curved both vertically and horizontally. A gravity dam built up of boxes, crossed timbers or gabions, filled with earth or rock. Gravity dams are massive structures, which their stability depends on the gravity loads applied into the structure. Currently, researches on the gravity dam deep and shallow antisliding stability mainly focus on the analysis method and instability criterion, while the studies on specifically test the breakage of gravity dams due to weakening foundation rock mass and structural planes under loading are rare. Numerical simulation of prenotched gravity dam models. The longtan hydropower station is mainly built for power generation in the upper reaches of the hongshui river, china. Gravity dam is constructed of concrete andor masonry andor laidup. Request pdf numerical simulation of prenotched gravity dam models the aim of this work is to investigate the behavior of a 96mhigh gravity dam the prototype with a preexisting crack. Concrete dam engineering 1 0401544 hydraulic structures university of sharjah dept. Numerical research on the gravity dam deep antisliding.
Design of gravity dam, calculation in reservoir full. Numerical modelling of masonry gravity dams considering the internal structure of the material 9th international masonry conference, guimaraes 2014 5 4. However, this approach is too conservative and mostly does not. Forces acting on a gravity dam following are forces acting on a gravity dam. A concrete gravity dam is a massive concrete structure, roughly triangular in shape, and designed so that its weight ensures structural stability against the hydrostatic pressure of the impounded water and other forces that may act on the dam. In the present paper, one of the gravity dams at beauharnois power plant has been studied and is analyzed using ansys software assuming that aar does not occur. Request pdf numerical simulation of prenotched gravity dam models the aim of this work is to investigate the behavior of a 96mhigh gravity dam.
Gravity dams are constructed from masonry or concrete. Chapter 6 concrete dam engineering with examples 1. The relevant amount of soil around and bottom of the gravity dam has been modeled to simulate the insitu conditions. Unique problems or unusual solutions may require deviations from the. In this paper, a fluidstructure coupled finite element numerical method with combination of lagrangian and eulerian algorithm is applied, taking into consideration the damage development process of the huangdeng. Example on design of gravity dam free download as pdf file. The following are the various methods which can be adopted for carrying out the stability analysis of gravity dams. This engineer manual supersedes em 111022200 dated 25 september 1958. A concrete gravity dam has the following dimensions. Gravity dams are solid concrete structures that maintain their stability against design loads from the geometric shape and the mass and strength of the concrete. Earthquake response analysis of a gravity dam considering. Research article application of probabilistic method to.
The structure gravity dam is assumed to be elastic and analyzed by plane strain formulation. The dam is a rollercompacted concrete rcc gravity dam with a crest elevation of 406. Masonry gravity dams a numerical application for stability. Gravity dam is so proportioned that its own weight resists the forces acting upon it. Example on design of gravity dam flood control infrastructure. Assessment of the loss of cohesion scenario of a masonry dam the main failure mechanism of a masonry gravity dam is the loss of cohesion due to the chemical. The method can be called the partial safety factor numerical method. Today, feanalyses are a common tool for assessment, design etc. Numerical 3d finite element fe analyses allows the engineers to perform more accurate and detailed analyses, compared to the traditional design methods. Techniques for the safety assessment a summary of available numerical methods for the sliding safety. A gravity dam is designed in such a way that it resists all external forces acting on the dam like water pressure, wind pressure, wave pressure, ice pressure, uplift pressure by its own selfweight. Dam dam is a solid barrier constructed at a suitable location across a river valley to store flowing water. However, there are not only positive aspects of this development.
Numerical threedimensional fea 1 flow analysis is a very efficient method for the stress analysis of the subsurface drainage systems of concrete gravity dams. To solve such a problem in the design of a concrete gravity dam on the ibar river nearby kraljevo, an algorithm for elastoplastic material model was adopted and implemented in the program pak. Stability analysis of concrete gravity dam on complicated. This method of stability analysis is also sometimes known as two dimensional methods. A new method that 3d numerical simulation combined with anticut stability analysis is employed to analyze the stability of majiabian gravity dam, and the results of the analysis conform to the measured value. Abstract in the proposed study, the effect on gravity dam has been examined using finite element analysis software ansys 14. Gravity dam loads on concrete dams loads can be classified in terms of applicabilityrelative importance as primary loads, secondary loads, and exceptional loads. The current numerical simulation is based upon the explicit dynamics finite element program abaqusexplicit. This research project constitutes the first complete series of tests on a gravity dam including hydro. A dam built to divert water from a waterway or stream into a different watercourse. The procedures in this manual cover only dams on rock foundations. Dynamic response of concrete gravity dams including dam. It is intended to implement an internal drainage facility, which would reduce uplift pressure by about 20%.
Structural assessment of gravity dams by means of a semi. Numerical examples demonstrate that sbfem is a powerful numerical method dealing with hydrodynamic problems. This paper performs numerical simulation of antiknock performance and failure modes of concrete gravity dams under blast loading. Although the weight of dam also helps in resisting the forces, the structural behaviour of earthen dam is entirely different fro. The thesis covers the methodology for estimating the probability of failure of a given concrete gravity dam with five water levels, considering the sliding failure mode along the damfoundation interface along with the estimation of factors of safety for each water level and with two different drainage conditions. Numerical modelling of masonry gravity dams considering. Analysis and design of gravity dam in seismic zone v project by. The solid form is the more widely used of the two, though the hollow dam is frequently more economical to construct. In this method, the dam is considered to be composed of parallel sided vertical cantilevers. Philosophiae doctor engineering evaluating the safety of unreinforced concrete structures, such as concrete dams, requires an. Numerical simulation analysis of damage mode of concrete. Masonry gravity dams a numerical application for stability analysis figure 2 show the loads involved in gravity dams analysis, namely. Numerical modeling of concrete gravity dams youtube. Failure of gravity dam occurs due to overturning, sliding, tension and compression.
The related numerical results from this study illustrated that the existence of the sediment at the bottom of the reservoir has significant effects on the response of concrete gravity dams since the soft layer of the sediment plays two main roles in the damwaterfoundation system, the energy dissipation of the system and the amplification. Pdf numerical simulation analysis of damage mode of concrete. Sliding safety of existing gravity dams final report. Effect of soil structure interaction on gravity dam. Pdf the design of a gravity dam is performed through an interactive process. Pdf the study of damage mode of a concrete gravity dam under closein explosive impact is a critical issue to assess the dams antiknock. What is the major difference between an earthen dam and a.
Subsequently, the possible failure modes of concrete gravity dams subjected to underwater explosion are discussed. The gravity dam is completely resting on soil media and surrounded by soil media. By analyzing the effects of mesh size, some interesting conclusions regarding the mesh size for actual events are obtained. When the results of 2d sliding stability analysis satisfy codes requirements, elastic material can be used in 3d.
So far, reservoir bottom absorption effects are neglected. When the results of 2d sliding stability analysis satisfy codes requirements, elastic material can be used. A finite element analysis has been performed on a full scale concrete gravity. The seismic response analysis of the longtan gravity dam is selected as an engineering example. The dam is composed of three blocks of equal heights. Mainly, its structural assessment is performed by means of a gravity approach. This thesis presents a twodimensional hydrodynamic stability analysis of gravity dams for the. Thus the objective of study is comprises of the finite. The experimental results were subsequently used as a basis for a numerical correlation. Then the dam with the case that is analyzed considering aar, the results were evaluated and compared.
Based on damage mechanics theory, this paper established a numerical model that. Finite element analysis of gravity dam with drainage. Forcedvibration tests were completed on outardes 3 gravity dam, located in northeastern quebec, canada. Pdf gravity dam design engineer manual ivan ramirez. Guidelines for design of dams table of contents section title page preface to the january 1 1989 edition 1 introduction 2 2 definitions 3. Exercise problem 1 a concrete gravity dam 15 m height will be constructed with the dimensions shown in the figure below. And this method can be used in analysis of congener gravity dam. Numerical simulation of failure modes of concrete gravity. The study of damage mode of a concrete gravity dam under closein explosive impact is a critical issue to assess the dams antiknock security. Terminology types of concrete gravity dams are not covered in this manual. The gravity method of the analysis does not consider the size of opening and the elastic property of dam material. The numerical results are verified by comparing with analytical expressions in different scaled distances.
A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using the weight of the material alone to resist the horizontal pressure of water pushing against it. A new numerical model for the structural assessment of gravity dams by means of a semidiscrete approach is proposed. The effects of water compressibility, reservoir boundary absorption as well as reservoir geometry can be considered with relative ease. Drainage gallery is very critical in case of gravity dam. Gravity dams are classified as solid or hollow and are generally made of either concrete or masonry. Learning outcome after this lecture, students should be able to 1. The upstream impounded water level is 15 m below the dam crest elevation. Pdf design of gravity dam by genetic algorithms researchgate. Outardes 3 gravity dam and the evaluation of the performance of stateoftheart numerical models used for earthquake analysis of concrete dams, on the basis of comparisons with experimental findings.
Pdf experimental and numerical investigation of dam. There are four major problems, in general, which are posed by. Stability analysis of gravity dams for the maximum design. Numerical simulation of nonlinear structural responses of. Design and construction of concrete gravity dams nptel. Ungated spillways have been provided in dams located in remote areas where spillway operation by manual control is difficult. Numerical simulation for the mechanical behaviors of a.
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