Abstract
For the steel bridge fabricators, it becomes one of the most important task to omit the process of shop assembly in simple type bridges, such as plate/box girger bridges, providing to maintain the quality of fabrication despite saving the man-hour. The authors have developed a new system that simulated the shop assembly in the process of fabrication, and which contained the system measuring the 3-dimesional configuration of bridge members. In this paper, the simulation technique based on the optimization one is verified to be appropriate, and the simulation system is proved to be reliable and practicable enough through comparison between the simulation results and the actual results measured in case of shop assembly and construction.