RESEARCH ON MECHANICAL PROPERTIES OF STEEL PLATES WITH ROUND HOLES UNDER REPEATED TENSILE AND COMPRESSIVE LOADS

In order to investigate the mechanical properties of steel plates with round holes under repeated tensile and compressive loads, the numerical analysis for steel plates with round holes under four patterns of repeated tensile and compressive loads were carried out. The deformation patterns, stress-strain hysteretic curves and strength coefficients under the ultimate state were compared and analyzed. Then the influence laws of loading patterns, opening forms and diameters of holes on hysteretic performances of specimens were obtained. The results showed that the phenomena of stress concentration were occured surrounding round holes of steel plates under repeated tensile and compressive loads, and the phenomena of stress concentration under the tensile state was more obvious than that of the compressive state. The maximal strain values under the repeated loading were the dominated effect on degeneration of hysteretic properties of specimens, while the number of repeated loading cycles had less influence on degeneration of hysteretic performances. When the quantity and diameter of round holes were small, the effects of the openings on hysteretic properties of specimens were not obvious. While the quantity or diameter of round holes was bigger, the effects of the openings on hysteretic properties of specimens would become obvious.