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Calculation of stresses in concrete ocean structures subjected to steady and time-varying temperatures, as influenced by creep
Abstract The stress redistribution brought about by differential thermal creep in non-uniformly heated concrete structures is considered. Theory is presented which permits stresses to be evaluated in both the transient creep phase and in the limiting steady-state condition, from direct procedures, when temperatures are either time-invariant or vary cyclically in time. Illustrative numerical examples are presented and these reflect the dominant behaviour of flexurally restrained sections as occur in the walls of concrete oil containment structures. They are used also, to highlight some of the influential parameters on the stresses, e.g. magnitude of temperature crossfall through wall, ratio of maximum to minimum temperatures, and the nature of the cyclic variations of temperature with time. It is concluded that creep, coupled with non-uniform temperature, causes significant time-dependent variations of the stresses to occur. The theory presented forms a useful means of making stress predictions for specified states of temperature and helps to assess the probability of possible cracking in sections which might otherwise be assumed to be ‘safe’ from a conventional elastic calculation. The analyses relate to prestressed sections where cracking does not dominate, and to stress levels in the ‘working’ range for which creep is linearly related to stress.
Calculation of stresses in concrete ocean structures subjected to steady and time-varying temperatures, as influenced by creep
Abstract The stress redistribution brought about by differential thermal creep in non-uniformly heated concrete structures is considered. Theory is presented which permits stresses to be evaluated in both the transient creep phase and in the limiting steady-state condition, from direct procedures, when temperatures are either time-invariant or vary cyclically in time. Illustrative numerical examples are presented and these reflect the dominant behaviour of flexurally restrained sections as occur in the walls of concrete oil containment structures. They are used also, to highlight some of the influential parameters on the stresses, e.g. magnitude of temperature crossfall through wall, ratio of maximum to minimum temperatures, and the nature of the cyclic variations of temperature with time. It is concluded that creep, coupled with non-uniform temperature, causes significant time-dependent variations of the stresses to occur. The theory presented forms a useful means of making stress predictions for specified states of temperature and helps to assess the probability of possible cracking in sections which might otherwise be assumed to be ‘safe’ from a conventional elastic calculation. The analyses relate to prestressed sections where cracking does not dominate, and to stress levels in the ‘working’ range for which creep is linearly related to stress.
Calculation of stresses in concrete ocean structures subjected to steady and time-varying temperatures, as influenced by creep
England, G.L. (Autor:in)
Applied Ocean Research ; 1 ; 33-41
01.01.1979
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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