Abstract：Abstract：Research purposes： For the structure layout of platform canopy, a class of variable cross section column abnormal joints has been designed. In order to make the joints have good mechanical performance, many plans for the structural arrangement are optimized, non - linear finite element analysis of a steel abnormal joint was performed using ABAQUS computation program. By comparing several different cross section forms and influence of connection way on the mechanical performance of the joints, the thickness of different round steel tube concrete column end plates and height of internal reinforced rib are offered, the stress analysis of the upper square steel tube and lower round steel tube concrete columns is performed. Research conclusions:( 1 ) The thickness of end plate, the reasonable value of height of reinforced rib and the arrangement direction of reinforced ribs are aligned with the pipe wall stress which is much higher, and it can meet the requirements of the joint. (2 ) The shape of the cast - steel joint shape can meet the requirements of architectural modeling because of the big freedom. ( 3 ) The strength, local stability and deformation of joints can meet the design code. (4) The stress can be reduced, the joint stiffness can be enhanced and the local deformation of the joint can be avoided by reasonably setting the wall thickness of the joint and the internal reinforced rib to meet the design requirements. (5)The abnormal joints can be used for the design of similar canopy.
2016, Vol. 33 
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