The structural behavior and load-carrying capacity of multi-planar column joints in a tubular tower were investigated under static loading in the test instrument of self-balancing frame with two full-scale test specimens.Based on this，the nonlinear finite element models were established.The analysis results were compared with the experimental results，which showed good agreement.The parametric analyses were also performed by reasonable and credible finite element models.The investigation indicates that the concave deformation occurs in their main pipes without the failure of branches and welds.All the measuring points of the joints are basically kept in linear elastic condition under design loads，showing that the design for the joint is very safe.Moreover，the ratio of chord radius to thickness has significant influence on the ultimate strength.The load-carrying capacity of the joint is improved with the growth of wall thickness when the diameter of chord is large.However，it increases slowly with the increase of wall thickness when the diameter is small.〖JP2〗The brace with small diameter and wall thickness is easily yielded and shows flexural buckling.