The experiments were carried out to investigate the behavior and strength of tube–gusset connections with 1/4 annular ribbed plate.Based on the FEM, the strength of tube–gusset connections with different thinwall, different width and thickness of ribbed plate and modes of ribbed plate was analyzed.The calculation method of ultimate strength were proposed.It is found that the thickness of tube and the width and thickness of ribbed plate have evident influence on the strength of tube–gusset connections with ribbed plate with the conditions of tube and ribbed plate.