Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment
Thesis (M. Eng.)--Memorial University of Newfoundland, 1980. Engineering and Applied Science Bibliography: leaves 150-157. Nonlinear static and dynamic analyses are presented for 'cut-and-cover’ type underground reinforced concrete nuclear reactor containments subjected to internal pressurizati...
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ftmemorialunivdc:oai:collections.mun.ca:theses2/89903 2023-05-15T17:23:30+02:00 Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment Ahmad, Mohamed Fouad Abdel Meneim, 1949- Memorial University of Newfoundland. Faculty of Engineering and Applied Science 1979 xvii, 157 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/89903 Eng eng Electronic Theses and Dissertations (41.59 MB) -- http://collections.mun.ca/PDFs/theses/Ahmad_MohamedFouadAbdelMeneim.pdf 75058093 http://collections.mun.ca/cdm/ref/collection/theses2/id/89903 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Nuclear reactors--Containment Underground nuclear power plants Underground construction Text Electronic thesis or dissertation 1979 ftmemorialunivdc 2015-08-06T19:16:40Z Thesis (M. Eng.)--Memorial University of Newfoundland, 1980. Engineering and Applied Science Bibliography: leaves 150-157. Nonlinear static and dynamic analyses are presented for 'cut-and-cover’ type underground reinforced concrete nuclear reactor containments subjected to internal pressurization. A nonlinear anisotropic model has been adapted and incorporated into a general linear and nonlinear, static and dynamic finite element analysis programme, NONSAP, to account for the orthotropic behaviour of reinforced concrete. The load increment required in elastoplastic static analysis, and the time interval, as well as the boundary simulation of infinite or semi-infinite continuum in dynamic analysis, are adequately taken into account in this study. Numerical investigations of the stability of equilibrium iteration procedure to reduce the divergence of the incremental solution from the true solution, are also presented. -- Parametric studies for the static response of the containment are carried out for: 1) stiffness of backfill (original and stabilized sandy loam fill with different cement ratios, 2%, 6%, and 10%); 2) thickness of backfill (2.5, 7.5, 12.5, and 18.5m); 3) percentage of reinforcing steel (#18 bars @ .25m, #18 bars @ .35m, #14 bars @ .35m, and plain concrete); 4) thickness of containment (1.25, 1.5, 2, and 2.5m) and; 5) different types of surrounding medium (sandy loam, clay, sand stone, and silty clay). The response values determined are: 1) maximum positive vertical displacement, ii) maximum negative vertical displacement, iii) vertical and horizontal displacement, iy) stress-displacement relation at the point of maximum stress concentration. The results confirm the effect of the different parameters on the response of the containment. The stiffness of backfill and the containment thickness have the greatest effect. The reinforcement effect is amplified when plastic flow commences. -- Dynamic analysis is carried out to study the response of a containment to a typical pressure-time function following a Loss-of-Coolant-Accident (LOCA). A disturbance in displacements and stresses, is observed immediately after pressure decreases for two seconds after which the response becomes steadystate. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Nuclear reactors--Containment Underground nuclear power plants Underground construction |
spellingShingle |
Nuclear reactors--Containment Underground nuclear power plants Underground construction Ahmad, Mohamed Fouad Abdel Meneim, 1949- Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
topic_facet |
Nuclear reactors--Containment Underground nuclear power plants Underground construction |
description |
Thesis (M. Eng.)--Memorial University of Newfoundland, 1980. Engineering and Applied Science Bibliography: leaves 150-157. Nonlinear static and dynamic analyses are presented for 'cut-and-cover’ type underground reinforced concrete nuclear reactor containments subjected to internal pressurization. A nonlinear anisotropic model has been adapted and incorporated into a general linear and nonlinear, static and dynamic finite element analysis programme, NONSAP, to account for the orthotropic behaviour of reinforced concrete. The load increment required in elastoplastic static analysis, and the time interval, as well as the boundary simulation of infinite or semi-infinite continuum in dynamic analysis, are adequately taken into account in this study. Numerical investigations of the stability of equilibrium iteration procedure to reduce the divergence of the incremental solution from the true solution, are also presented. -- Parametric studies for the static response of the containment are carried out for: 1) stiffness of backfill (original and stabilized sandy loam fill with different cement ratios, 2%, 6%, and 10%); 2) thickness of backfill (2.5, 7.5, 12.5, and 18.5m); 3) percentage of reinforcing steel (#18 bars @ .25m, #18 bars @ .35m, #14 bars @ .35m, and plain concrete); 4) thickness of containment (1.25, 1.5, 2, and 2.5m) and; 5) different types of surrounding medium (sandy loam, clay, sand stone, and silty clay). The response values determined are: 1) maximum positive vertical displacement, ii) maximum negative vertical displacement, iii) vertical and horizontal displacement, iy) stress-displacement relation at the point of maximum stress concentration. The results confirm the effect of the different parameters on the response of the containment. The stiffness of backfill and the containment thickness have the greatest effect. The reinforcement effect is amplified when plastic flow commences. -- Dynamic analysis is carried out to study the response of a containment to a typical pressure-time function following a Loss-of-Coolant-Accident (LOCA). A disturbance in displacements and stresses, is observed immediately after pressure decreases for two seconds after which the response becomes steadystate. |
author2 |
Memorial University of Newfoundland. Faculty of Engineering and Applied Science |
format |
Thesis |
author |
Ahmad, Mohamed Fouad Abdel Meneim, 1949- |
author_facet |
Ahmad, Mohamed Fouad Abdel Meneim, 1949- |
author_sort |
Ahmad, Mohamed Fouad Abdel Meneim, 1949- |
title |
Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
title_short |
Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
title_full |
Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
title_fullStr |
Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
title_full_unstemmed |
Ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
title_sort |
ultimate load behaviour of internally pressurized 'cut-and-cover' orthotropic reactor containment |
publishDate |
1979 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/89903 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (41.59 MB) -- http://collections.mun.ca/PDFs/theses/Ahmad_MohamedFouadAbdelMeneim.pdf 75058093 http://collections.mun.ca/cdm/ref/collection/theses2/id/89903 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
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1766112859821965312 |