Influence of Early Temperature Rise on Movements and Stress Development in Concrete Decks
Publication: Journal of Bridge Engineering
Volume 15, Issue 1
Abstract
The primary focus of this paper is to develop an understanding of temperature changes introduced by hydration heat release in the first few hours after casting in the thermal movements and stresses of the concrete deck and girders. Temperature and strain measurements from a simply supported, single-span, steel girder bridge with a composite concrete deck are presented. It is shown that setting occurs during the temperature rise and partial strain compatibility between steel girder and concrete deck is initiated at the end of the concrete temperature rise. Full strain compatibility between concrete deck and steel girder is achieved at the end of the cooling period following the initial temperature rise. The stresses in the steel girder associated with temperature changes are interpreted using an analytical model. It is shown that the concrete deck gains sufficient stiffness at the end of the temperature rise to restrain the movement of the top flange. Concrete deck movement in the period associated with cooling following the initial temperature rise is restrained, which could potentially produce tensile stress in concrete. The magnitude of tensile stress at the end of the cooling period depends upon the difference in the temperatures of the concrete deck and top flange and on the temperature gradient in the steel girder at the end of the heating period.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 15 • Issue 1 • January 2010
Pages: 108 - 116
Copyright
© 2010 ASCE.
History
Received: Jan 3, 2008
Accepted: May 22, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
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