Title
Унапређење методологије контроле угиба армиранобетонских конструкција
Creator
Pecić, Nenad P., 1963-
Copyright date
2012
Object Links
Select license
Autorstvo-Nekomercijalno-Deliti pod istim uslovima 3.0 Srbija (CC BY-NC-SA 3.0)
License description
Dozvoljavate umnožavanje, distribuciju i javno saopštavanje dela, i prerade, ako se navede ime autora na način odredjen od strane autora ili davaoca licence i ako se prerada distribuira pod istom ili sličnom licencom. Ova licenca ne dozvoljava komercijalnu upotrebu dela i prerada. Osnovni opis Licence: http://creativecommons.org/licenses/by-nc-sa/3.0/rs/deed.sr_LATN Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-nc-sa/3.0/rs/legalcode.sr-Latn
Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
description
Датум одбране: 16.04.2013.
Other responsibilities
mentor
Marinković, Snežana. 1962-
član komisije
Bajić, Dejan, 1950-
član komisije
Najdanović, Dušan, 1949-
član komisije
Lađinović, Đorđe, 1956-
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Beogradu
Faculty
Građevinski fakultet
Alternative title
Improved method for deflection control of reinforced concrete structures
Publisher
[Н. Пецић]
Format
PDF/A (241 list)
description
Грађевинарство и геодезија-Бетонске конструкције / Civil engineering-Concrete structures
Abstract (sr)
Напредак у развоју алата за пројектовање грађевонских конструкција није пратила одговарајуће подршка у области провере деформација армирано-бетонских елемената...
Abstract (en)
Development of design tools for reinforced concrete is not followed with
convenient procedures for the deflection check. Most of the software using finite
element calculation does not support proper evaluation (including effects of cracking,
creep and shrinkage) of the deflection of concrete structures. Use of high strength
materials enables reduction of the size of structural elements. As a result, structures
become more deformable and it is necessary to check deflection.
Simplified and refined methods are usually presented by most of design codes or
recommendations for the deflection check. The simplified methods provide faster and
easier calculation. They are generally on the safe side and require enlarged dimensions
of structural elements. The refined methods involve relevant properties of concrete,
environmental conditions and construction schedule, allowing for optimization of the
size of structural elements. Apart from not being suitable for hand calculation, they
often require some additional knowledge.
Eurocode 2 (EN 1992-1-1:2004) also provides two methods for the deflection
check. Simplified criterion is in a form of span-to-depth ratio limit. This tool has serious
limits. It is not well prepared for practical use (it is derived for an unsuitable ratio of the
quasi-permanent to the ultimate load; it also does not include the compressive
reinforcement other then required for ULS). The second, rigorous method is based on
general approach for deflection calculation - integration of the curvatures along the
element. The effective modulus method is used for calculation of long-term effects due
to creep and shrinkage of concrete. Influence of concrete cracking to the stiffness is
introduced by interpolation coefficient according to CEB-FIP Model code 1990. This
more refined method seems to be easy applicable due to lack of the very important
instruction: bending moment diagram of the statically indeterminate structures, resulting
from an ordinary ULS analysis based on concrete gross sections, should be redistributed
to account for effects of cracking, creep and shrinkage. This option is not usually
supported by common engineering software and task becomes heavy. Evaluation of the
redistributed diagram requires a time-dependant stiffness matrix and an iterative
calculation following appearance of cracks...
Authors Key words
армирани бетон, угиб, дуготрајно оптерећање, Еврокод 2, прерасподела
Authors Key words
reinforced concrete, deflection, long-term, Eurocode 2, redistribution
Classification
624
Subject
Armiranobetonske konstrukcije
Type
Tekst
Abstract (sr)
Напредак у развоју алата за пројектовање грађевонских конструкција није пратила одговарајуће подршка у области провере деформација армирано-бетонских елемената...
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