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Author(s):	Yan, Dongming; Xu, Shilang; Chen, Genda; Li, Hedong
Title:	Biaxial behaviour of plain concrete subjected to dynamic compression with constant lateral stress
Abstract:	This study investigates the dynamic biaxial behaviour of concrete by testing more than 60 cubic specimens on a custom-designed, servo-hydraulic-controlled machine. Each specimen was axially loaded in compression at a constant strain rate of 10-5, 10-4, 10-3 or 10-2 s-1 while two opposite side faces were subjected to a constant confining pressure and the other two side faces were free. The confining pressure applied to each specimen was 0, 30.5, 61.0 or 91.5 % of its uniaxial compressive strength. Test results indicate that the biaxial strength of concrete increases with strain rate at a reduced slope as confining pressure increases. The failure mode of the concrete specimens was basically unaffected by the strain rate. An empirical relation for the ultimate strength of concrete in a biaxial stress state was developed taking into account the effects of both confinement and strain rate.
Source:	Structural Concrete 15 (2014), No. 2
Page/s:	202-209
Language of Publication:	English

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