An optimum cross section of a precast modular bridge was drew by using the combinational optimization method. The constraints for the optimization procedure including the width and the thickness of the bottom flange, and the maximum area of the cross section, etc. were considered, and weight of the girder was minimized to draw an optimum cross section. Furthermore, the segmentation of the girder in its longitudinal direction was studied for satisfying the requirement of traffic law about overloading.

• 지광습(고려대학교 건축사회환경공학과 부교수, 공학박사) | Zi, Goangseup
• 김나영(고려대학교 건축사회환경공학과 석사과정) | Kim, Na Young