Abstract
In this paper, the effects of heterogeneity of structural concrete on the mechanical behaviors of reinforced concrete (RC) members are discussed. Main results are summarized as follows : 1) The unstable curvature localization in RC beam caused by heterogeneity of structural concrete is relatively small when the perfect bond between longitudinal steel bar and concrete is assumed, but is cleary noticed when the slippage between longitudinal steel bar and concrete is considered. 2) The maximum load and ductility of RC member subjected to multiaxial loading in combination with axial force and bending moment decrease with the increase of coefficient of variation of concrete strength. 3) The effect of heterogeneity of structural concrete on mechanical properties of RC column depends on the loading method. Using the loading method that the rotations of both ends of RC column are confined, the load deflection curve and curvature distribution of RC column are hardly affected by the distribution of concrete strength, owing to the casting height. Using the loading method that the distribution of bending moment is reversly symmetrical with respect to the center of RC column, however, the mechanical properties of RC column is very affected by heterogeneity of structural concrete.
