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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Axial Restraint on Mechanical Behavior of High- Strength Concrete Beams
Author(s): Eun-Ik Yang, Shiro Morita, and Seong-Tae Yi
Publication: Structural Journal
Appears on pages(s): 751-756
Keywords: cracking; early ages (of concrete); high-strength concrete.
Abstract:This study was performed to verify the effect of restraint of axial deformation (that is, thermal and time-dependent volume change after concrete placing and axial elongation due to lateral loading) on mechanical behavior of high-strength concrete beams. For this purpose, the characteristics of concrete beams (the development of the restrained stress and the mechanism of crack formation due to the restrained stress and so forth) were studied on the basis of the experiments and numerical analyses of the data for high-strength concrete beams at an early age. When a high-strength concrete member is axially restrained, a crack might propagate in the member not demolded at an early age. This is caused by a drop of temperature that results from the hydration heat of cement and autogenous shrinkage and not by drying shrinkage, which would not have started as yet. The restrained stress of a member is accurately obtained by calculating the externally restrained force and the steel stress. The maximum restrained stress is determined by the cracking strength of concrete. It is concluded that the additional restrained stress is released and the axial rigidity of member is reduced with formation of additional cracks.
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