Abstract
Nonlinear 3D finite element models (FEM) of the two kinds of joints, namely steel bars headed through the pipe joint and steel bars welded with the upper strengthened ring joint, are established by using the ANSYS program. By choosing the suitable element type, boundary condition and loading regime, the author made intensive study on the stress distribution of the steel tubular, the concrete, the strengthened ring and the bar. The result shows that the finite element model accords with the actual stress situation of the joint. Holes on the steel tubular have little effect on the bearing capacity of the axial load of the joint, but the greater impact on the shear transfer.
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