Comparative Study on Compressive-Shear Behavior of Ordinary Concrete and Lightweight Aggregate Concrete
YU Zhenpeng1, HUANG Qiao1, XIE Xinghua2, LU Bin2
1 School of Transportation, Southeast University, Nanjing 210096; 2 Hydraulic Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029
Abstract: In order to study the mechanical properties of ordinary concrete and lightweight aggregate concrete under compression-shear composite stress, the experiment of compression-shear composite stress was carried out under different axial compression ratio. The different failure modes and the shear load-displacement curve for two concrete were extracted by using compression-shear hydraulic servo machine and the characteristic values of the transverse shear load-displacement curve were extracted, which were used to be comparative analysis their mechanical properties. The results showed that with the increase of the axial compression ratio, the lateral shear load, shear peak displacement and residual load of the two kinds of concrete are all increased, and the light aggregate concrete is relatively more obvious. From the residual load analysis, there were stable friction coefficient between the shear failure surfaces and the friction coefficient of the lightweight aggregate concrete was obviously higher than that of ordinary concrete. Accor-ding to the mathematical return of two kinds of concrete, axial load and shear peak load, axial load and residual load were linear relationship. The failure criterion of the two kinds of concrete with different analytic properties were obtained by using the octahedral space stress. The analytical formula could respond to the failure law of the two concrete compression-shear composite forces well which provide favorable value for engineering application research.
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2018, Vol. 32 
