Experimental Study On Constitutive Relation Of Concrete Under A Few Plane Strain Loading Paths

Although many experimental results in failure criterion and constitutive relation of concrete have been reported, most of them were only applicable to simple proportional monotonic loading. The thesis deals with the experimental study on the constitutive relationships of concrete under one kind of complex loading path that contains the feedback control of strain—proportional monotonic loading path with constant confining deformation under stress spherical tensor. The thesis includes five chapters as follows.The first chapter is preface. It expounds the significance of this study and the relevant literatures. Meanwhile the historical and present background of the research of experiment and theory plain concrete is introduced systematically. Based on the information, the objectives of this paper are put forward.The second chapter introduces design of experiment, preparation of concrete specimens, test system and operating procedure.The third and fourth chapters are based on the test datum and complete stress-strain curves under proportional monotonic loading path with constant confining deformation under isometric stress spherical tensor or varying stress spherical tensor. The basic regularities of the strength and deformation, the characteristics of stress path, stress-strain curves, volumetric deformation, Poisson ratio and material modulus are summarized. Experimental results indicate that the conditional failure criterion is applicable to the loading path in this thesis. The thesis provides the experiment basis for the further analysis.The fifth chapter is the conclusion. The main achievements of this paper are summarized and the further research of this field is pointed out.