Abstract: In order to improve the ultimate bearing capacity, the theory of functionally graded material is introduced. Thickwalled cylinder with functionally graded characteristics is gained by analyzing the different reinforcing methods along the radial direction. The stress state of the thickwalled cylinder with plain concrete and three different reinforcing methods under the radical uniform load are analyzed. Comparisons and evaluations are provided on basis of ANSYS results. A reasonable reinforcing method, whose reinforcement ratio near the outer is large and that near the inner is small, is different from the traditional methods. But the abovementioned method is the worst method and it is wrong that reinforcing the part with large circumferential stress in the case of thickwalled cylinder.

Key words: thick walled cylinder, functionally graded material, concrete reinforcement, stress concentration, reinforcement arrangement