The Study On The Theory And Experiment Of Three-section Compressing Of Concrete Material Characteristics

Mainly, concrete structures are used as structures that bear pressure. The most simple failure process of concrete under monospindle compressing stress is of the best representativeness, and the stress-strain cureve represents the basic mechanical characteristics, which is the descriptive and quantitative qualifier of macroscopic representation of cracks in the concrete material, also is the reflection of many physical and mechanical characteristics, such as strength/elasticiry/plasticity/ tensility/ toughness, so it is one of the main reference of strength and deformation study of concrete.Frictional resistance between end face of concrete test piece and pressure head of testing machine influences experimental result greatly. Frictional resistance constrains lateral deformation of end face of test piece, resulting in unevenness of deformation to the whole test piece. Test piece isn't under linear stress state, but triaxial state of stress, especially material aound the end face. To decrease the fictional resistance, a new testing method—concrete three-section compressing experiment method is brought forward in this paper. Eperimental and FEM analysis show the feasibility of this method.