Catenary assembled single rib arch that carries vertical loadings and was analyzed in this paper, calculation formula of critical loading of lateral stability flexuosity by the energy principle.

The design methods of the link including confirmation of its length and cross section, design of its rib stiffener, design of its connection and lateral braces are emphasized.

The utility model comprises a triangle bracket body, a thread through hole arranged on the triangle bracket body, and a reinforcing rib arranged on one lateral side of the triangle bracket body.