STATIC AND FATIGUE TENSILE BEHAVIOR OF CONCRETE UNDER BILATERAL COMPRESSION

The static and fatigue tensile behavior of concrete under bilateral compression is studied experimentally. The ultimate tensile strength, axial tensile strain and lateral compression strain are obtained and compared. It is seen that the axial tensile strain develops rapidly and the ultimate tensile strength decreases greatly with lateral compression. On the other hand, lateral compression strain develops rapidly with axial tension too. Through tensile fatigue experiments, some S-N equations, curves of stress-strain, strain-ratios of deformation modulus and strain-number of cycles relationships which comply with the three-stage rules are obtained. Three-stage curves are transformed to lines by defining logarithmic linear transformation variables ε_t and e_tm, respectively. Contrariwise, the three-stage curves can be established by the linear relationships. The comparative analyses of correlative physical parameters of concrete in static tension and tensile fatigue show that fatigue life and deformation modulus reduce largely because of lateral compression.