Abstract
Automation has recently extensively developed in bridge fabrication. In the case of girders of box-section, only the panels composing them are fabricated in assembly lines with robots. The automatic welding has, however, not been Fully utilized for formation of box section, because it is difficult to manipulate the welding machines inside, their interior structures are complicated, and the feasibility of use of the automatic welding has been regarded to be too low. Instead, manual welding has generally been used for this purpose, but welders are obliged to work under very adverse circumstances in this case. In this paper, when the panels composing girders of boxsection are fabricated in assembly lines with robots, the author proposes a method using robots for welding in the interior of box-girders by which diaphragm and cross rib details are improved. Especially cross rib details are discussed though stress analysis using finite element method.
