Temat: arch dam - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Earthquake analysis of arch dams including the effects of foundation discontinuities and proper boundary conditions
Autorzy:: Ferdousi, A.
Mostafa Gharabaghi, A. R.
Ahmadi, M. T.
Chenaghlou, M. R.
Emami Tabrizi, M.
Powiązania:: https://bibliotekanauki.pl/articles/279306.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: concrete arch dam
non-homogeneous and discontinuous rock foundation
nonlinear dynamic analysis
boundary conditions
Opis:: The interaction between dam foundation and rocks plays a significant role in the design and analysis of concrete arch dams. In the current study, comprehensive dynamic analysis of the dam-reservoir-foundation system is performed by developing a non-linear finite element program. The objective of this paper is to study the seismic behavior of a concrete arch dam taking into account the effects of foundation discontinuities and foundation inhomogeneity on the stability. Proper modeling truncated boundary conditions at the far-end of the foundation and reservoir fluid domain as well as to correctly apply the in-situ stresses for the foundation rock represents field conditions in the model more realistically. In this paper, the nonlinear seismic response of the dam-reservoir-foundation system includes dam-canyon interaction, dam body contraction joint opening, discontinuities (possible sliding planes) of the foundation rock and the failure of the joined rock and concrete materials. The results for the Karun 4 dam as a case study revealed the substantial effect of modeling discontinuities and boundary conditions of the rock foundation under seismic excitation that needs to be considered in the design of new dams and can be applied to seismic safety evaluation of the existing dams.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 579-594
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Feasibility study of Dez arch dam heightening based on nonlinear numerical analysis of existing dam
Autorzy:: Hariri-Ardebili, M. A.
Mirzabozorg, H.
Powiązania:: https://bibliotekanauki.pl/articles/231238.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tama łukowa
Dez
model numeryczny
analiza nieliniowa
ocena bezpieczeństwa
kombinacja obciążenia
arch dam
numerical model
nonlinear analysis
safety evaluation
load combination
Opis:: The Dez dam was commissioned in 1963 and since sediments accumulated in the reservoir up to an elevation of approximately 15m below the intake of the power tunnel. One of the possible measures to improve operation of the reservoir is by heightening of the existing dam. This paper describes the conducted procedure for static and thermal calibration of this 203m dam in Iran based on micro geodesies measurements. Also the nonlinear response of existing dam is investigated under maximum credible earthquake ground motions considering joint behavior and mass concrete cracking and safety of dam is evaluated for possible heightening. For thermal calibration of provided numerical model, transient thermal analysis was conducted and results were compared with thermometers records installed in central block. In addition, for static calibration; thermal distribution within dam body, dam self weight, hydrostatic pressure and silt load applied on the 3D finite element model of dam-reservoir-foundation were considered. Results show that the distribution of stresses will be critical within dam for heightening case under seismic loads in MCL.
Źródło:: Archives of Civil Engineering; 2013, 59, 1; 21-49
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Combination of artificial neural networks and numerical modeling for predicting deformation modulus of rock masses
Autorzy:: Tayarani, Narges Saadat
Jamali, Saeed
Zadeh, Mehdi Motevalli
Powiązania:: https://bibliotekanauki.pl/articles/219719.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: sztuczne sieci neuronowe
symulacja numeryczna
metoda różnic skończonych
masy skalne
artificial neural networks
numerical simulation
finite difference method
deformation modulus of rock mass
arch dam
Opis:: The deformation modulus of the rock mass as a very important parameter in rock mechanic projects generally is determined by the plate load in-situ tests. While this test is very expensive and time-consuming, so in this study a new method is developed to combin artificial neural networks and numerical modeling for predicting deformation modulus of rock masses. For this aim, firstly, the plate load test was simulated using a Finite Difference numerical model that was verified with actual results of the plate load test in Pirtaghi dam galleries in Iran. Secondly, an artificial neural network is trained with a set of data resulted from numerical simulations to estimate the deformation modulus of the rock mass. The results showed that an ANN with five neurons in the input layer, three hidden layers with 4, 3 and 2 neurons, and one neuron in the output layer had the best accuracy for predicting the deformation modulus of the rock mass.
Źródło:: Archives of Mining Sciences; 2020, 65, 2; 337-346
0860-7001
Pojawia się w:: Archives of Mining Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Probabilistic safety evaluation of a concrete arch dam based on finite element modeling and a reliability L-R approach
Autorzy:: Pouraminian, Majid
Pourbakhshian, Somayyeh
Noroozinejad Farsangi, Ehsan
Fotoukian, Reza
Powiązania:: https://bibliotekanauki.pl/articles/396613.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: Pacoima arch dam
safety evaluation
Monte Carlo simulation
hydrostatic pressure
random variables
worst case
zapora łukowa Pacoima
ocena bezpieczeństwa
symulacja Monte Carlo
ciśnienie hydrostatyczne
zmienne losowe
Opis:: The safety assessment of the Pacoima arch dam is investigated in this paper. A Load – Resistance (L-R) method was used to ensure that the dam is safe or if it is at risk of failure. The "probabilistic design system" ANSYS finite element software was used to calculate the probability of failure. The Monte Carlo (MC) method with 50,000 iterations utilized for simulation and the Latin Hypercube method were used for Sampling. Input random variables with normal distribution and coefficient of variation of 15% due to uncertainties were considered and the six random variables used are the concrete modulus of elasticity, Poisson's ratio of concrete, concrete mass, up-stream normal water level of the reservoir, and the allowable tensile and compressive strength of the concrete. Linear elastic behavior was assumed for the constitutive law of concrete material and if the stress exceeds the allowable stress of the concrete this is considered as a failure limit state. The maximum and minimum principal stresses were considered as the output parameter. Dam body safety was investigated only under self-weight and upstream hydrostatic pressure at the normal water level [...]
Źródło:: Civil and Environmental Engineering Reports; 2019, 29, 4; 62-78
2080-5187
2450-8594
Pojawia się w:: Civil and Environmental Engineering Reports
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Most nad zaporą Hoovera
Autorzy:: Dąbrowiecki, K.
Powiązania:: https://bibliotekanauki.pl/articles/364754.pdf
Data publikacji:: 2011
Wydawca:: Nowoczesne Budownictwo Inżynieryjne
Tematy:: most
most łukowy
USA
Zapora Hoovera
arch bridge
bridge
Hoover Dam
Opis:: Zapora Hoovera na rzece Kolorado znajduje się w odległości 50 km od Las Vegas, przy trasie prowadzącej do Wielkiego Kanionu. Dla milionów turystów odwiedzających stolicę światowego hazardu stała się lokalną atrakcją turystyczną w drodze do jednego z siedmiu cudów natury.
Źródło:: Nowoczesne Budownictwo Inżynieryjne; 2011, 3; 10-13
1734-6681
Pojawia się w:: Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:: Biblioteka Nauki

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