DBPapers
DOI: 10.5593/SGEM2016/B62/S27.066

CONCRETE SHRINKAGE STRESSES AND THERMAL EFFECTS IN THE COMPOSITE GIRDERS ACCORDING TO EUROCODES

C.Moga, S.Gutiu, A.Danciu, M.Suciu
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-69-8 / ISSN 1314-2704, June 28 - July 6, 2016, Book6 Vol. 2, 501-508 pp

ABSTRACT
In the steel-concrete composite structures, the phenomena of creep and shrinkage lead to the shortening of the concrete slab and it affects the concrete behavior. As concrete is rigidly connected to steel, the shortening is partially stopped and brings about the redistribution of stresses inside the section.
The redistribution of the stresses leads to concrete unloading and increase of stresses in the steel compressed area. The paper presents the mechanism through which shrinkage stresses develop in the case of a simply supported steel-concrete composite girder.
The calculation parameters, the strains and modulus of elasticity for concrete at various times since casting are assessed according to Eurocodes approach (EN 1992 and EN 1994).
The temperature variations of the air and thermal radiations produce variations of the temperature distribution in the individual members of a structure. This paper also presents the influence of the difference of temperature between the opposite faces of a steel-concrete composite cross section upon the internal state of stresses.
The mechanism through which stresses develop from concrete shrinkage and temperature variation is exemplified for the case of a simply supported steel-concrete composite box girder.

Keywords: composite box girders, concrete shrinkage, stresses due to shrinkage, stresses due to thermal effects.