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دانلود مقالات تخصصی انگلیسی در زمینه سازه های آبی رفتن به صفحه : قبلی  1, 2, 3 ... 29, 30, 31
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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: چهار‌شنبه 27 خرداد 1394 - 19:56    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

A novel force-based approach for designing armor blocks of high-crested breakwaters
2014
A. Pak|M. Sarfaraz
Abstract :
Rubble-mound breakwaters are common marine structures that provide a safe area for human coastal activities. The stability of these structures against sea-waves requires their seaward slope to be protected by an armor layer consisting of natural rock or concrete units. To provide a safe breakwater, it is reasonable to establish a relation between the exerted wave loads and the stability of the armor units. However, up to now,the empirical design equations, derived from model tests, relate wave parameters to armor weight, and keeps the e ect of wave loads in a black box. In this paper, a new approach, based on numerically-derived wave loads on the armor, is presented to evaluate the stability of these protective units. Results indicate that by increasing wave height, the weight of the armor units does not necessarily increase. Wave breaking type strongly inuences the applied loads and stability of the armor units. New dimensionless numbers are introduced to provide relationships between wave parameters and stability indices of reakwater armor units at di erent locations. This approach clari es the ambiguities of the design process caused by the complex flow eld, especially the wave breaking type near the breakwater.
Keywords :
Wave forces;Breakwaters;Armor units stability;Numerical modeling.
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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

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: چهار‌شنبه 27 خرداد 1394 - 23:01    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Reducing Extent of Cracks and Increasing Time to Failure of Concrete Gravity Dams by Optimization of Properties of Layers of Concrete
2014
Abdolreza Joghataie|Mehrdad Shafiei Dizaji
Abstract :
The objective of this paper has been to study the improvement in the seismic behavior of concrete gravity dams by optimization of concrete mechanical properties. The criteria to measure the improvement have been: 1) reduction in the extent of cracks and 2) increase in the time the dams are able to tolerate earthquakes before failure. The mechanical properties considered have included the density and modulus of elasticity of concrete. Pine Flat dam has been selected for this numerical study. During a high intensity earthquake, dams enter nonlinear phase where the cracks open and close repeatedly. Smeared crack model has been used for the simulation of nonlinearity. For the purpose of optimization, the dam has been divided into horizontal layers where the concrete has been assumed to have the same properties at every point within each layer. The results of this study have shown that by using lower density concrete at upper layers and in the region of the crest of the Pine Flat dam, it has been possible to both reduce the extent of the induced cracks and increase the time to failure of the dam. The same methodology can be applied to other concrete gravity dams.


Keywords :
Concrete gravity dam, optimization, failure, nonlinear response, smeared crack model.
Reference and download

_________________
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

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: چهار‌شنبه 27 خرداد 1394 - 23:22    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

PULVINO and Peripheral Joint Effects on Static and Seismic Safety of Concrete Arch Dams
2013
M. A. Hariri-Ardebili|H. Mirzabozorg|M. Ghaemian
Abstract :
One of the methods in limiting tensile stresses in arch dams and removal stress concentrations at dam-foundation interface is setting the dam body on a concrete saddle called PULVINO. In the present study, effect of PULVINO and peripheral joint on the static behavior and seismic performance of arch dams are investigated. DEZ dam with 203m height was selected as case study and all contraction joints of the dam body were modeled using discrete crack approach based on as-built drawings. Also, surrounding rock was modeled as a mass-less medium tied to PULVINO. The dam-reservoir-foundation system was analyzed under static loads accounting for stage construction effects, hydrostatic and thermal loads and then the provided numerical model was excited using near- and far-field earthquake ground motions. It was found that modeling peripheral joint between saddle and the main dam body changes the direction of principal stresses and their distribution patterns and safety of the system is improved. In addition, over stressed surfaces on faces of the dam body decreased in comparison with the model without peripheral joint.


Keywords :
Contraction joints; Arch dam; Peripheral joint; PULVINO; Nonlinear seismic performance
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_________________
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

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: چهار‌شنبه 27 خرداد 1394 - 23:35    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Nonlinear Dynamic Analysis of Concrete Gravity Dam Considering Elastoplastic Constitutive Model for Foundation
2013
Seyyed Meisam Aghajanzadeh |Mohsen Ghaemian
Abstract :
Dam failure can result in a catastrophic break followed by a flood wave often with considerable loss of life or property. One of the main causes of dam failure is loss of shear strength and existence of discontinuity within foundation. Dynamic analysis of concrete dams usually considered concrete behavior to be nonlinear and foundation rock is assumed to be linear. In this study, seismic analysis of concrete gravity dam was conducted to investigate effect of foundation on the nonlinear response. A finite element model of dam-reservoir-foundation was considered to properly model the foundation as well as dam body nonlinear behaviors. An elasto-plastic formulation was used to model the foundation. Mohr-Coulomb model was utilized for the yield and potential functions of the foundation. The dam body modeled by using smeared crack model. After modeling the dam-reservoir foundation, horizontal recorded ground acceleration of Kobe 1995 earthquake was applied to the model and results were studied. It was found that cracks form at the crest and hill of the dam.Using elastoplastic model for the foundation is more realistic and under different boundary conditions a significant amount of energy will be dissipated in the foundation.


Keywords :
Foundation’s elastoplastic behavior, nonlinear dynamic analysis, Mohr-Coulomb model, smeared crack mode, seismic analysis, concrete gravity dam
Reference and download

_________________
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

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: شنبه 30 خرداد 1394 - 12:08    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Legendre spectral element method for seismic analysis of dam-reservoir interaction


Author(s): Reza Tarinejad , Sajjad Pirboudaghi
Study Type: Research Paper | Subject: Structure-Earthquake
Article abstract:
It is well-known that dam-reservoir interaction has significant effects on the response of dams to the earthquakes. This phenomenon should be considered more exactly in the seismic design of dams with a rational and reliable dynamic analysis method. In this research, seismic analysis of the dam-reservoir is studied as a wave propagation problem by using Legendre Spectral element method (SEM). The special FEM and SEM codes are developed to carry out the seismic analysis of the damreservoir interaction system. The results of both SEM and FEM models are compared considering the accuracy and the time consumption of the analysis. Attractive spectral convergence of SEM is obtained either by increasing the degree of the polynomials in the reservoir or by the number of elements of dam. It is shown that all boundary conditions of the reservoir domain in the SEM are evaluated by the exact diagonal matrices. The SEM leads to the diagonal mass matrix for both dam and reservoir domains. The stiffness matrices obtained from the SEM are more sparse than the corresponding stiffness matrices in the FEM consequently the SEM needs a significant less time consumption of the analysis.
Keywords: Spectral element method (SEM), Dam-reservoir interaction, Wave propagation, Finite element method (FEM), GLL quadrature.,
Reference and download

_________________
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

محل سکونت: همدان iran.gif


امتیاز: 210689
[وضعيت كاربر:آفلاین]

پست تاریخ: دوشنبه 15 تیر 1394 - 02:38    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Use of Numerical Simulation to Measure the Effect of Relief Wells for Decreasing Uplift in a Homogeneous Earth Dam
Article 4, Volume 48, Issue 1, June 2015, Page 35-45 XML PDF (545 K)
Document Type: Research Paper
Authors
1 Farzin Salmasi ; 2 Behnam Mansuri; 3 Amir Raufi
1Water Engineering Department, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
2M.Sc. Student of Hydraulic Structures, University of Tabriz, Tabriz, Iran
3M.Sc. Student of Hydraulic Structures, University of Azad Ahar, Ahar, Iran.
Abstract
Relief wells are used extensively to relieve excess hydrostatic pressure in pervious foundation strata overlain by impervious top strata, conditions which often exist landward of levees and downstream of dams and hydraulic structures. Placing well outlets in below-surface trenches or collector pipes helps dry up seepage areas downstream of levees and dams. Relief wells are often used in combination with seepage control measures, such as upstream blankets, downstream seepage berms, and grouting. Draining seepage water into relief wells decreases uplift and prevents piping. This study examined the effect of relief wells with different diameters at different distances downstream of a homogeneous earth dam using Seep/W software. Also the effect of upstream water level of reservoir on seepage flow to each well was carried out. Results show that by decreasing the distance between relief wells and increasing the diameter of the relief wells, total uplift pressure decreases. The optimum distance between relief wells to decrease uplift pressure was found to be 5 m. The proposed method is recommended in designing relief wells by providing optimum diameter and distance of wells for the sustained yield.
Keywords
Collector pipe; Earth dam; Relief well; Seepage; Uplift
Reference
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_________________
مرجع کاربردی طراحی سازه های فولادی با نرم افزار ETABS 2013 و SAFE ورژن 12 : http://goo.gl/zkqFfH

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