Title
Analiza uticaja reoloških svojstava kod složenih spregnutih konstrukcija slojevitim konačnim elementima
Creator
Cumbo, Anđelko P. 1964-
Copyright date
2016
Object Links
Select license
Autorstvo-Nekomercijalno-Bez prerade 3.0 Srbija (CC BY-NC-ND 3.0)
License description
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Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 25.04.2017.
Other responsibilities
mentor
Folić, Radomir
član komisije
Stojić, Dragoslav
član komisije
Vacev, Todor
član komisije
Stošić, Saša
član komisije
Ranković, Slobodan
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Nišu
Faculty
Građevinsko-arhitektonski fakultet
Group
Katedra za materijale i konstrukcije
Alternative title
Analysis of rheological properties impact in complex composite structures of layered finite elements
Publisher
[А. P. Cumbo]
Format
30 cm XXIV, 266, [5] str.
description
Biografija autora: str. [267]
description
Theory of structures
Abstract (en)
This paper contains a proposed numerical procedure for determination of stress and deformations state due to creep and shrinkage of concrete and relaxation of prestressed steel in composite structures with apply of the finite element method. Stiffness matrix of linear finite-element is performed by use of layers technique, but rheological properties of concrete and prestressed reinforcement are introduced by fictive loading.
For procedure development, generalized incremental stress-deformation links are used for viscous materials derived by application of displacement method. The manner is analysed in more details to determine fictive forces due to viscous deformations, especially the axial forces part as a contribution from the pure member bending. Improved procedure is formulated which provides considerable correction of results accuracy without the need of structure discretization on the bigger number of finite elements.
Here developed procedure for calculation of composite structures is applicable in various technological procedures of construction-work with enabled gradual inclusion of some individual parts of composite section into a stress active section. It has been shown that time - dependent (rheological) changes considerably change state of stress and deformations of CS and that in their design negative impacts cannot be left out of the analysis. To that aim, the author has developed a program package with whose application, it is simple to get the needed results.
Authors Key words
spregnute konstrukcije, sprezanje, reologija, tečenje, skupljanje, viskozne deformacije, vremenske deformacije, slojeviti konačni elementi
Authors Key words
composite structures, rheology, creep, shrinkage, viscous deformations, time deformations, layered finite elements
Classification
624.016(043.3)
Subject
Т 230
Type
Elektronska teza
Abstract (en)
This paper contains a proposed numerical procedure for determination of stress and deformations state due to creep and shrinkage of concrete and relaxation of prestressed steel in composite structures with apply of the finite element method. Stiffness matrix of linear finite-element is performed by use of layers technique, but rheological properties of concrete and prestressed reinforcement are introduced by fictive loading.
For procedure development, generalized incremental stress-deformation links are used for viscous materials derived by application of displacement method. The manner is analysed in more details to determine fictive forces due to viscous deformations, especially the axial forces part as a contribution from the pure member bending. Improved procedure is formulated which provides considerable correction of results accuracy without the need of structure discretization on the bigger number of finite elements.
Here developed procedure for calculation of composite structures is applicable in various technological procedures of construction-work with enabled gradual inclusion of some individual parts of composite section into a stress active section. It has been shown that time - dependent (rheological) changes considerably change state of stress and deformations of CS and that in their design negative impacts cannot be left out of the analysis. To that aim, the author has developed a program package with whose application, it is simple to get the needed results.
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