Named cadam computer analysis of dams, the programme is based on the gravity method using rigid body equilibrium and beam theory to perform a stress. A shear capacity of 60% of the ultimate tensile load included in global sliding stability safety factors. Chapter iii gravity dams federal energy regulatory. Numerical modeling of concrete gravity dams youtube. Masonry gravity dams a numerical application for stability. Chapter iii gravity dams 30 contents title page 31 purpose and scope 31. Stability analysis of gravity dam using staad pro bahaa safaa. Pdf stability analysis of concrete gravity dam on complicated. Safety analysis of rupsiabagarkhasiabara dam under seismiic. Overload and material weakening were taken into account, and a finite difference strength reserve method with partial safety factors based on the reliability method was developed and used to study the antislide stability of a concrete gravity dam on a complicated foundation with multiple slide planes.
Gravity dam design united states army corps of engineers. Jan 23, 2015 lecture 5 safety and stability analysis modified2 1. The ground water table can be calculated in the fem water flow program, and then passed into slope stability or fem programs for stability analysis. This paper checks the stability of one dam by rigid body limit equilibrium method and finite element technique. Rupsiabagarkhasiabara dam is located on river goriganga, which is originates from the milam glacial regions of. All stability problems can also be solved by finite element method fi,c reduction method in the fem program.
Pdf computer aided stability analysis of gravity damscadam. The weight of gravity dam will cause a moment opposite to the overturning moment and the friction. The production of interactive engineering design software using borland delphi. The construction of songlin rockfilled concrete gravity dam, located in the yunnan province, china began in the end of 2015. Cadam2d is also used to support research and development on the structural behavior and safety of concrete dams.
Named cadam computer analysis of dams, the programme is based on the gravity method using rigid body equilibrium. However, formatting rules can vary widely between applications and fields of interest or study. Stress and sliding stability analysis of songlin rockfilled concrete gravity dam max ivedal max sundstrom the construction of songlin rockfilled concrete gravity dam, located in the yunnan province, china began in the end of 2015. Height is the vertical dimension from the downstream toe of the dam at its lowest point to the top of the dam. Stability analysis of concrete gravity dam on complicated. This work presents a numerical application for stability analysis of masonry gravity dams. Stress and sliding stability analysis of songlin rockfilled. Stability analysis of slopes of earth dams soil engineering. The stability analysis of the us slope and ds slope during construction are carried out by the method of slices.
This work was supported by the innovation program for college graduate of. Cadam3d stability analysis software for concrete dams. Cadam2d computer analysis of dams is a software that has been primarily designed to support the learning of structural stability evaluation principles of concrete gravity dams. Even though stability analysis of concrete structures is a structural engineering responsibility, the analysis must be. Analysis of the stability is generally conducted at the dam base rockconcrete contact and at selected planes within the dam. Federal criteria for the calculation of uplift pressures as well as crack initiation and propagation criteria in the stability of concrete gravity dams. The code automates the prediction and evaluation of cracking in the dam, along the dam rock interface, and in the foundation using incremental nonlinear analysis techniques based on the smeared crack approach. With the three different conditions are x when the reservoir is empt y.
Rigid body limit equilibrium method is a kind of traditional stable analytical method, which is confirmed by factual. Some of these criteria, which are conservative, lead to the overdesign of dam. Some numerical parameterssensitivity analysis has been conducted to evaluate the stability and propagation of the interface cracks at heel of concrete gravity dam. Concrete mix design calculation for m20, m25, m30 concrete with. Cgdams is a finite element based program written specifically for the stability analysis of concrete gravity dams. Read, highlight, and take notes, across web, tablet, and phone. A crib dam is a gravity dam built up of boxes, crossed timbers, or gabions filled with earth or rock. This report summarizes the results of this investigation.
Polytechnique montreal wants to commercialize a 3d stability analysis software for hydraulic structures called cadam3d. Rupsiabagarkhasiabara dam is located on river goriganga. The main objectiv e is to determine the stability of the concrete gravity dam with different load conditions by varying the water level. Pdf computer aided stability analysis of gravity dams. Several tools are available in cadam3d to allow the user to properly interpret the results of the analyzes and check all the calculation steps. A stress analysis of gravity dams is performed by two methods. Stability analysis of concrete gravity dam scientific. Load cases that include an initial vertical point load equal to 0%, 50% and. The research group on dam safety at ecole polytechnique, university of montreal, canada, has developed a computer program for static and seismic stability analysis of concrete gravity dams. Article pdf available in advances in engineering software 347. In this method, the dam is considered to be composed of parallel sided vertical cantilevers. This manual presents analysis and design guidance for concrete gravity dams.
Cadam is based on the gravity method using rigid body equilibrium and beam theory to perform stress analyses, compute crack lengths, and safety factors. Abaqusstandard abaqusexplicit in this example we consider an analysis of the koyna dam, which was subjected to an earthquake of magnitude 6. A key problem in gravity dam design is providing enough stability to prevent slide, and. The weight of gravity dam will cause a moment opposite to the overturning moment and the friction on the base will prevent the dam from sliding. The pressure due to this seepage is commonly called hydrostatic uplift and will reduce the stability of the dam against sliding and against overturning. Fracture analysis on the interface crack of concrete.
Stress and sliding stability analysis of songlin rock. Stability analysis of gravity dam by using staad pro in. The stability of a dam can be analysed in the following steps. Cadam is primarily designed to provide support for learning the principles of structural stability evaluation of gravity dams. A high concrete gravity dam was designed based on u. The gravity dam has sufficient weight so as to withstand the force and the over turning moments caused by the water impounded in the reservoir behind it. Cg dams is a finite element based program written specifically for the stability analysis of concrete gravity dams. The following are the various methods which can be adopted for carrying out the stability analysis of gravity dams. The code automates the prediction and evaluation of cracking in the dam, along the damrock interface, and in the foundation using incremental nonlinear analysis techniques based on. For this type of dam, impervious foundations with high bearing strength are essential. Cadam3d is a software for stability analyses of concrete dams.
Due to concrete cracking, and related modifications in uplift pressures, the stress and stability analysis of a dam is in general a nonlinear process. The evolution of damage in the concrete dam at six different times during the earthquake is illustrated in figure 2. A new overlay of 35mp 5,000psi compressive strength concrete was placed on the crest of the dam to withstand punching shear. The safety is firstclass important event of the dam. The bearing plates were designed to withstand a 4,450kn 1,000ktension load. The crash for the gravity dam usually causes due to slid, the slippery stable is a key problem of big dam. The stability of concrete gravity dam is analyzed by using staad pro. This is a misnomer since a foundation bearing, crushing of the structure toe, andor a sliding failure will occur before the structure overturns. Conventional concrete and roller compacted concrete are both addressed. In this master thesis the finite element method fem based software abaqus has been used to perform a computational analysis on tension stresses, compression stresses and sliding stability for static conditions. The code automates the prediction and evaluation of cracking in the dam, along the damrock interface, and in the foundation using incremental nonlinear analysis techniques based on the smeared crack approach. The ferc guidance contained in this technical report is based on the 1999 summer draft. This paper presents the main features and organisation of cadam, a computer program, freely available, that has been developed for the static and seismic stability evaluations of concrete gravity dams.
Due to concrete cracking, and related modifications in uplift pressures, the stress and stability. Cadam3d is a userfriendly software based on the gravity method originally developed for hydroquebec and for dams and hydrology of the quebec ministry of environment. This project basically gives the analysis of stability of concrete gravity dam by using. Dam stability downloaded international water power. This manual replaces the term overturning stability analysis with resultant location. Due to the complex geology, the stability analysis is not possible to be performed using any traditional method without significant approximations which. Some masonry and concrete gravity dams have the dam axis curved shasta dam, cheesman dam to add stability through arch action. Work out the magnitude and dimensions of all the vertical forces acting on the dam and their algebraic sum, i. Awoonga dam spillway queensland, australia ghd was engaged by g ladstone area water board to undertake a stability analysis for the concrete ogee crest spillway for. This method of stability analysis is also sometimes known as two dimensional methods.
Evaluation and comparison of stability analysis and uplift criteria for concrete gravity dams by three federal agencies. Gravity dam is constructed of concrete andor masonry andor laidup stone that relies upon its weight for stability. Analysis of the stability is generally conducted at the dam base rock concrete contact and at selected planes within the dam. It could also be used for research and development on stability of gravity dams. What is the best software to design the structure dam. Stability analysis of gravity dam by using staad pro in time history method s. The code automates the prediction and evaluation of cracking in the dam, along the dam rock interface, and in the foundation using incremental nonlinear analysis techniques based on. Computer aided stability analysis of gravity damscadam article pdf available in advances in engineering software 347. Cadam is based on the gravity method using rigid body equilibrium and beam theory to perform stress analyses, compute. Computer aided stability analysis of gravity damscadam.
Using third party software to generate the geometry 26. Response spectrum analysis as per is1893 in staad pro. Stability analysis of gravity dam using staad pro civil. Gravity dams are designed so that each section of the. Sep 17, 2001 the research group on dam safety at ecole polytechnique, university of montreal, canada, has developed a computer program for static and seismic stability analysis of concrete gravity dams. Lowlevel outlet is an opening at a low level used to drain or lower the water. Google scholar 17 usace us army corps of engineers. Damage to the dam initiates during the seismic analysis in the third step. A hybrid distinct elementboundary element approach for seismic analysis of cracked concrete gravity damreservoir systems, soil dynamics and earthquake engineering.
Stability analysis of concrete gravity dam on complicated foundation. A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily using the weight of the material alone to resist the horizontal pressure of water pushing against it. Study set 912 static of fluids center of pressuresubmerged surfaces. Stability analysis of concrete gravity dam on complicated foundation with. Stability analysis of concrete gravity dam for seismic.
Comparison of stability criteria for concrete dams in different. Safety analysis of rupsiabagarkhasiabara dam under. Modelling and apply pushover and cyclic load test on beam column by abaqus and get hysteresis loop duration. Gravity dams can be classified with respect to their structural height. Curved gravity dams designed for arch action and other types of concrete gravity dams are not covered in this manual. Gravity and pseudo dynamic analysis in followup to ferc part 12 inspection, hunters dam, murphys project, murphys, california, utica power authority dr. Nov 29, 2017 details language english duration 20 mins format. Therefore there was a need to develop an interactive userfriendly software, such as cadam. The analysis involves computation of driving moment that is due to tangential component of weight of the slices, and the resisting moment that is due. Effect of vertical shear on the stability of gravity walls appendix g earthquake forces from backfill appendix h classification of structures. Cadam3d is fully functional and is intensively used by hydroquebec since 2005.
Download code stability analysis of gravity dam using staad. Stability analysis of concrete gravity dam an overview. Findlay conducted two and three dimensional gravity analyses on two sections of the thrust blocks of hunters dam, a single concrete arch dam ferc 2019ca. In this master thesis the finite element method fem based software abaqus. Stability analysis geotechnical software geo5 fine. A hollow gravity dam is a dam constructed of concrete andor masonry on the outside but having a hollow interior relying on its weight for stability. In adopting several different worldwide published dam safety guidelines, a large number of modelling options have been implemented. 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. Em 111022100 1 dec 05 installed from the crest of the dam and generally extended into the foundation. Stability analysis of a concrete gravity dam using shear strength reduction method nonlinear finite element method was used. From the geometrical dimensions, the material characteristics, hydrostatic loads and seismic loads, the. Mar 04, 2014 stability analysis of gravity dam using staad pro bahaa safaa. Any stability analysis of the dam should s eek to apply forces that are compatible with the failure mechanism be ing assumed.
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