| Concrete-filled steel tubular structure has given full play to the advantages of the two materials both technologically and financially,boasting great application value and showing the developing orientation of the engineering material technology.As is well-accepted,the key part and main difficulty of this composite structure is the joint. The reasonable design of the joint is of great value in theoretical and engineering application for sake of structure safety and project cost.Therefore,obtaining complete and accurate information of the joints performance is significant for frame analysis and structure reliability.Although theoretical formulas of joint of circular steel tube with outer annular-stiffener,which have been derived from the researches conducted by both domestic and overseas scientists,are mature under the standard conditions at present time,the joints in realistic program are always irregular.Researches on this issue are not sufficient.Therefore,this essay takes the main joint of structure of Hohhot East Railway Station' as an example,using the joints in key position of the main structure as the original model.The general software-ANSYS has been used to simulate the original model,while SHELL188 for analysis.When the intersection angle is 0°, 15°,30°,45°,60°,75°and90°,the stress value on the annular plane which bears double-direction pressure and displacement on lines is obtained respectively.Based on those data,the effect of the angles variation on the stress distribution of the annular plane is analyzed in this essay,leading to the generalization of concerning rules.In conclusion,this theory may provide useful information for the design of the joints in the future.
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