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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: جمعه 1 خرداد 1394 - 21:46    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

THE EFFECT OF RESERVOIR LENGTH ON DAM-RESERVOIR INTERACTION ANALYSIS BASED ON THE COMPRESSIBLE FLUID ASSUMPTION

Author(s): AKHAVEISSY AMIR HOOSHANG*, MALEKSHAHI MOHAMMAD

* DEPARTMENT OF CIVIL ENGINEERING, RAZI UNIVERSITY, KERMANSHAH, IRAN
JOURNAL OF SEISMOLOGY AND EARTHQUAKE ENGINEERING 2013 , Volume 15 , Number 3-4; Page(s) 195 To 206.
Abstract:

In this study, the position of the truncation boundary, which is an important issue when modeling the reservoir in the finite element formulation and determining the hydrodynamic pressure on the dam, is investigated. Water in the reservoir is assumed to be compressible, and the Sommerfeld boundary is used to model the far field. The Euler-Lagrange method is used to analyze the reservoir-dam interaction. The serendipity element is used to model the reservoir and dam. The foundation is considered to be rigid. Most researchers assume that the truncation boundary is located three times the total height of the dam away from the dam body, and they use the Sommerfeld boundary at this location. For this purpose, the reservoir was disconnected at different intervals. The Pine Flat Dam is commonly analyzed with a Taft earthquake. The results of the analyses for different positions of the truncation boundary in reservoir models show that the position of the Sommerfeld boundary at five times the height of the dam away fromthe dam body is a proper place for the truncation boundary. Moreover, comparing the results of the present study based on the compressibility of water and those of previous research based on the incompressibility assumption indicates that the maximum hydrodynamic pressure is approximately 153.8% for a Taft earthquake. Therefore, the assumption of water compressibility plays an important role when evaluating the Pine Flat Dam.

Keyword(s): FLUID-STRUCTURE INTERACTION, DYNAMIC ANALYSIS OF DAM, HYDRODYNAMIC PRESSURE, EULER-LAGRANGE METHOD, TRUNCATION BOUNDARY
http://en.journals.sid.ir/ViewPaper.aspx?ID=431984

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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: جمعه 1 خرداد 1394 - 22:18    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

SIMULATION OF SEQUENTIAL CONSTRUCTION OF EMBANKMENT BY FINITE ELEMENT METHOD

Author(s): BURMAN A.*, KUMAR S., HIMANSHU N., MAITY D.

* DEPARTMENT OF CIVIL ENGINEERING, NATIONAL INSTITUTE OF TECHNOLOGY, PATNA, INDIA

Journal: ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) 2015 , Volume 16 , Number 3; Page(s) 347 To 367.

Abstract:

In this paper, finite element method is used for the analysis of sequential construction of embankment. The idealized study gives information on the behavior of a multi-stage construction of an embankment over a soft cohesive deposit. If the response is determined after the construction of entire structure, it is likely to be different from the results which are obtained by considering sequential construction procedure. The displacement and stresses have been calculated during each stage of sequential construction of embankment. The developed computer program shows bearing capacity failure at final lift where the algorithm fails to converge leading to failure.

Keyword(s): EARTHEN EMBANKMENT, BEARING CAPACITY FAILURE, MATERIAL NON-LINEARITY, MOHR-COULOMB AND VON-MISES FAILURE CRITERIA, VISCO-PLASTIC FRAMEWORK, FINITE ELEMENT METHOD
http://en.journals.sid.ir/ViewPaper.aspx?ID=417986

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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: شنبه 2 خرداد 1394 - 01:43    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

NONLINEAR SEISMIC RESPONSE OF A CONCRETE ARCH DAM TO SPATIALLY VARYING EARTHQUAKE GROUND MOTIONS

Author(s): MIRZABOZORG H.*, AKBARI M., HARIRI ARDEBIL M.A.

* DEPARTMENT OF CIVIL ENGINEERING, KN. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
Journal: ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) DECEMBER 2013 , Volume 14 , Number 6; Page(s) 859 To 879.
Abstract:

Spatially uniform ground motion is an assumption that is often made for structural analyses of arch dams. However, it has been recognized for many years that the ground motion is non-uniform due to large distances between the supports of structures such as bridges and dams. In this paper, a comprehensive investigation on the seismic response of dam-reservoir-foundation systems subjected to spatially varying ground motions is represented. Monte Carlo simulation approach is utilized for generating spatially non-uniform ground motions. A high arch dam is selected as numerical example to investigate nonlinear seismic behaviour of the coupled system. Reservoir is modelled as compressible material and the foundation is supposed to be mass-less medium. Seismic responses of the dam due to incoherency and wave passage are investigated. According to the results, the non-uniform input produces a response that is substantially different from the response produced with uniform input and can increases the structural response of the system.

Keyword(s): CONCRETE ARCH DAM, INCOHERENCY, NON-UNIFORM EXCITATION, WAVE PASSAGE
http://en.journals.sid.ir/ViewPaper.aspx?ID=356260

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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: شنبه 2 خرداد 1394 - 13:01    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Construction of relief wells under artesian flow conditions at dam toes: engineering experiences from Karkheh earth dam, Iran


Author(s): M. Heidarzadeh , A. A. Mirghasemi , H. Niroomand
Study Type: Research Paper | Subject: Geotechnique
Article abstract:
We report engineering experiences from the critical task of relief well installation under high artesian flow conditions at the downstream toe of the Karkheh earth dam, Iran. Due to the establishment of excessive uplift pressure at the downstream toe of the Karkheh dam, installation of a series of new relief wells was considered to permanently relieve part of these pressures. The mentioned uplift pressure, as high as around 30 m above the ground level, was produced in a confined conglomerate aquifer bounded above and below by relatively impervious mudstone layers which reduced the safety factor of the dam toe to below 1.0. Investigations on the shortcomings of the old relief wells installed at the dam site showed that the main problems were: insufficient well numbers, insufficient well diameters, irregular well screens causing their blockage by time passing, and insufficient total opening area. Despite engineering difficulties and associated risk of downstream toe instability, installation of new relief wells was successfully completed under high artesian flow conditions” was successfully completed. The employed technique for the construction of the new relief wells under flowing artesian conditions was based on: 1) cement grouting and casing of the well, 2) telescopic drilling, 3) application of appropriate drilling fluid, and 4) controlling the artesian flow by adding a long vertical pipe to the top of the relief wells. Numerical modeling of seepage for the Karkheh dam foundation showed that, as a result of the installation of the new relief wells, the safety factor of the downstream toe increased to the safe value of 1.3 for the normal reservoir water level.
Keywords: Dam engineering, Geotechnical engineering, Karkheh embankment dam, Relief well, Artesian flow, Confined aquifer, Dam toe, Drilling fluid, Numerical simulations.,
Full text [PDF 1216 kb]
http://ijce.iust.ac.ir/browse.php?a_id=927&slc_lang=en&sid=1&ftxt=1
Source:
http://ijce.iust.ac.ir/browse.php?a_id=927&sid=1&slc_lang=en

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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: شنبه 2 خرداد 1394 - 13:07    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Nonlinear dynamic analysis of concrete gravity dams considering
rotational component of ground motion

L. Kalani Sarokolayi1, B. Navayi Neya2,*, J. Vaseghi Amiri2
Received: September 2013, Revised: November 2013, Accepted: December 2013
Abstract
This study focuses on non-linear seismic response of a concrete gravity dam subjected to translational and rotational
correlated components of ground motions including dam-reservoir interaction. For this purpose rotational components of
ground motion is generated using Hong Non Lee improved method based on corresponding available translational
components. The 2D seismic behavior of the dam concrete is taken into account using nonlinear fracture mechanics based on
the smeared- crack concepts and the dam-reservoir system are modeled using Lagrangian-Lagrangian approach in finite
element method. Based on presented formulation, Pine Flat concrete gravity dam is analyzed for different cases and results
show that the rotational component of ground motion can increase or decrease the maximum horizontal and vertical
displacements of dam crest. These results are dependent on the frequency of dam-reservoir system and predominant
frequencies of translational and rotational components of ground motion.
Keywords: Rotational component of ground motion, Nonlinear analysis, Concrete gravity dam, Smeared crack, Dam-
Reservoir interaction, Lagrangian-Lagrangian method.
Source:
http://ijce.iust.ac.ir/browse.php?mag_id=61&slc_lang=en&sid=1
Download:
http://ijce.iust.ac.ir/browse.php?a_id=945&slc_lang=en&sid=1&ftxt=1

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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: شنبه 2 خرداد 1394 - 13:11    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Dynamic pressure analysis at chute flip buckets of five dam model studies
O. Nazari1, E. Jabbari2*, H. Sarkardeh3
Received: February 2013, Revised: June 2013, Accepted: July 2013
Abstract
To dissipate energy and invert excessive discharge flow away from high dams into plunge pool, flip buckets are commonly
designed and optimized by hydraulic model studies. In the present study, performance of chute flip buckets in different
hydraulic and geometry conditions was investigated using experimental data of five different physical models. The collected
experimental data such as Froude number, radius of flip bucket and slope of chute covered a wide range of chute flip buckets
in prototype. By analyzing the data, relations for dynamic values of maximum and minimum pressures and their location along
the flip bucket were extracted. Moreover, pressure distribution along the central axis of flip bucket was defined. Finally,
results of the present research were compared with that of the other researches. Results of this study could be used in the
design of chute flip buckets in hydraulic engineering.
Keywords: Dams, Physical model, Flip bucket, Pressure distribution, Dynamic pressure.
Source
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: شنبه 2 خرداد 1394 - 13:21    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Shape optimization of arch dams with frequency constraints by enhanced
charged system search algorithm and neural network
A. Kaveh1*, R. Ghaffarian1
Received: July 2014, Revised: September 2014, Accepted: October 2014
Abstract
The main aim of this paper is to find the optimum shape of arch dams subjected to multiple natural frequency constraints
by using an efficient methodology. The optimization is carried out by charged system search algorithm and its enhanced
version. Computing the natural frequencies by Finite Element Analysis (FEA) during the optimization process is time
consuming. In order to reduce the computational burden, Back Propagation (BP) neural network is trained and utilized to
predict the arch dam natural frequencies. It is demonstrated that the optimum design obtained by the Enhanced Charged
System Search using the BP network is the best compared with the results of other algorithms. The numerical results show the
computational advantageous of the proposed methodology.
Keywords: Arch dam, Finite element, Frequency constraint, Enhanced charged system search, Optimum shape design, Neural
network.
Source
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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: شنبه 2 خرداد 1394 - 14:57    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Numerical analysis and monitoring of a rockfill dam at the end of construction (case study: Vanyar dam)


Author(s): M. Derakhshandi , H. R. Pourbagherian, M. H. Baziar, N. Shariatmadari , A. H. Sadeghpour
Study Type: Technical Note | Subject: Geotechnique
Article abstract:
In this study, the mechanical behavior of Vanyar dam was evaluated at the end of construction. A two-dimensional numerical analysis was conducted based on a finite element method on the largest cross-section of the dam. The data recorded by the instruments located in the largest cross-section were compared with the results of the numerical analysis at the place of instruments. The settlement, pore water pressure, and total vertical stress were the parameters used for evaluating the dam behavior at the end of construction. The results showed that the settlements obtained from the numerical analysis were in reasonable agreement with the data recorded by the instruments, which proved that the numerical analysis was implemented based on realistic material properties. In addition, the difference between the instruments and the numerical analysis in terms of total vertical stresses was discussed by focusing on the local arching around the pressure cells. Furthermore, the arching ratios were calculated based on the results of the numerical analysis and the data recorded by the instruments. Moreover, the pore water pressures and total vertical stresses, recorded by piezometers and pressure cells, respectively, were the two parameters utilized for evaluating the hydraulic fracturing phenomena in the core. The results demonstrated that the maximum settlement obtained from the numerical analysis was 1 m, which corresponded to 46 m above the bedrock on the core axis. The recorded data in the core axis indicated that maximum settlement of 0.83 m happened 40 m above the bedrock. In addition, maximum pore water pressure ratio recorded by the instruments (Ru =0.43) was more than that obtained from the numerical analysis (Ru =0.26); this difference was due to the local arching around the pressure cells. Furthermore, the arching ratios in Vanyar dam were found to be 0.83 to 0.90. In general, the results revealed that the dam was located on a safe side in terms of critical parameters, including settlement and hydraulic fracturing. In addition, results of the numerical analysis were consistent with those provided by the monitoring system.
Keywords: Rockfill dam, 2D-numerical analysis, Monitoring, Back analysis, Vanyar,
Full text [PDF 461 kb]
http://ijce.iust.ac.ir/browse.php?a_id=896&slc_lang=en&sid=1&ftxt=1
Source:
http://ijce.iust.ac.ir/browse.php?a_id=896&sid=1&slc_lang=en

_________________
مرجع کاربردی طراحی سازه های فولادی با نرم افزار ETABS 2013 و SAFE ورژن 12 : http://goo.gl/zkqFfH

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عضو شده در: 7 مهر 1385
پست: 37412

تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: یکشنبه 10 خرداد 1394 - 15:59    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

COLLIDING BODIES OPTIMIZATION FOR DESIGN OF ARCH DAMS WITH FREQUENCY LIMITATIONS


Author(s): A. Kaveh * , V.R. Mahdavi
Study Type: Research | Subject: Optimal design | Received: 2014/11/17 - Accepted: 2014/11/17 - Published: 2014/11/17
Article abstract:
In this paper, optimal design of arch dams is performed under frequency limitations. Colliding Bodies Optimization (CBO), a recently developed meta-heuristic optimization method, which has been successfully applied to several structural problems, is revised and utilized for finding the best feasible shape of arch dams. The formulation of CBO is derived from one-dimensional collisions between bodies, where each agent solution is considered as the massed object or body. The design procedure aims to obtain minimum weight of arch dams subjected to natural frequencies, stability and geometrical limitations. Two arch dam examples from the literature are examined to verify the suitability of the design procedure and to demonstrate the effectiveness and robustness of the CBO in creating optimal design for arch dams. The results of the examples show that CBO is a powerful method for optimal design of arch dams.
Keywords: colliding bodies optimization, arch dam, optimal design, frequency constraints.,
Reference
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پست: 37412

تشکر: 3354
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امتیاز: 210689
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پست تاریخ: یکشنبه 10 خرداد 1394 - 16:04    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

CFD SIMULATION OF FLOW OVER CONTRACTED COMPOUND ARCHED RECTANGULAR SHARP CRESTED WEIRS

Author(s): A. Samadi * , H. Arvanaghi
Study Type: Research | Subject: Optimal design | Received: 2014/11/17 - Accepted: 2014/11/17 - Published: 2014/11/17
Article abstract:
Measurement of discharge in open channels is one of the main concerns in hydraulic engineering. The structures used for this aim should be accurate, economical and easy to use. Weirs are among the oldest and most convenient hydraulic structures that have been used in both laboratory and field for flow measurement in open channels. Due to limitations of simple sharp crested weirs, recently compound sharp crested weirs have attracted great attention of civil engineers. In general, use of compound sharp crested weirs can be an appropriate solution when the discharge should be measure accurately with a reasonable sensitivity over a wide range of flows. The aim of this research is three-dimensional simulation of flow on contracted compound arched rectangular sharp crested weirs by using FLUENT software. For multiphase flow simulation, VOF method is used and for simulation of turbulent flow, RNG k-ɛ turbulence model is used and the result of numerical model is compared with experimental data. The results of this study indicate that; FLUENT simulate flow on contracted compound arched rectangular sharp crested weirs with high accuracy and we can use this software for determine the discharge coefficient on contracted compound weirs.
Keywords: contracted compound weir, discharge coefficient, FLUENT, RNG k-, 3D simulation, VOF,
Reference
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