| The high-strength Q460 angle has a wide applied prospect for its good capacity. The research of axial compressed members was relatively sufficient. The analysis of the axial compressed angle struts in the sub-structure is very poor. In order to research the mechanical capability and end restraint of the high strength Q460 angle struts in the sub-structure, this paper has done following research:(1) According to the theory of elastic buckling, through the analysis of the continuous axially-loaded angle strut which has a strong supports, the upper and lower struts have a limited support to the middle compression strut, and the formula was summarized in this condition.(2) Through the analysis of angle struts'displacement, failure mode, end restraint and comparison with the angle bars of the same slenderness ratio tested on the pressure tester, the results show that the struts'failure modes are global instability which were close to the angle bar test; the ductility of the sub-structure was better than angle bar. In the sub-structure, the end restraint of the angle strut had the horizontal motion, lateral displacement and rotation round bolts. The carrying capacity of the test substructure was lower than the angel bar with the same slenderness. The end restraint of the angle strut in the test substructure was lower than the knife edge which adopted in the angel bars test.(3) Considering the horizontal motion, through the change of the slenderness ratio and section of the angle in the sub-structure, the bearing capacity of these sub-structure was analyzed using the finite element analysis technology and contrast with the result which calculated by the formula of axially-compression bars. The results show that in this condition, the end restraint of the middle strut in sub-structure was stronger than the angle bar which tested on the pressure tester, the effective length factor less than 1. The paper also summarized the formula in this condition.
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