Research On The Numerical Simulation Of Ultimate Bearing Capacity Of Thick-walled Cylinder With Different Reinforcement Methods

In order to improve the ultimate bearing capacity, In this paper, the theory of functionally graded material is introduced. This paper simulate thick-walled cylinder with functionally graded characteristics through the analysis of using different reinforced ways along the radial direction. The stress distribution within a thick-walled cylinder will become more uniform.In order to prove the accuracy of the Ansys simulation and the correctness of the constraints, the author simulate the stress distributions through the wall thickness for the hoop and radial stresses of the (1) single-homogeneous layer thick-walled cylinder is under the radial uniform load by Ansys. The results are in line with the Lame solution. on the basis of (1)’s results, the author also simulated the the stress distribution of the two situation when (2) the modulus of the outer layer is lower than the inner one and (2) the modulus of the inner layer is lower than the outer one. Comparing the three different calculation results of stress distribution, the tesults are consistent with the theoretical results in. The study of stress distributions of three different reinforcement of thick-walled cylinder was carried out. A preliminary conclusion that the reinforcement that a reinforcement ratio is small near the inner wall and a large near the outter wall approach to improve the hoop stress distribution of the thick-walled cylinder along the radial direction.Based on the above study, the anthor designed nine reinforcement different ways of thick-walled cylinder based on the practical engineering experience, respectively:(1) more reinforcement inside, less reinforcement outside;(2) only reinforcement inside and a single row steel bar inside;(3) only reinforcement inside and a double row steel bar inside;(4) more reinforcement outside, less reinforcement outside;(5) only reinforcement outside and a single row steel bar inside;(6) only reinforcement outside and a double row steel bar inside;(7) increasing gradient reinforcement from the inside to outside;(8) decreasing gradient reinforcement from inside to outside;(9) uniform reinforcement from inside to outside. Based on Mises Yield criterion, By comparing with the ultimate bearing capacity of9different reinforced mode by Ansys simulation, the best thick-walled cylinder reinforcement approach to improve the bearing capacity was got, which is a approach that a large reinforcement ratio near the inside wall and a small reinforcement ratio near the outer wall. A further study was taken that the effect of the concrete strength grade on ultimate bearing capacity. The higher the concrete strength grade, the lower influence that reinforcement have on ultimate bearing capacity. Thus, with the large-scale use of high strength grade concrete, the affect of reinforcement on ultimate bearing capacity of thick-walled cylinder is extremely limited, to find a more reasonable economic structure of thick-walled cylinder is the current focus of the study.