The domestic and foreign specifications presented the effective width based on flange length to width ratio only. The existing paper on the effective width grasped of the effect of span, load type and cross-section properties, but localized steel bridges. Recently, The studies are going on in progress for the application of fiber reinforced composite material in construction field. Therefore, it is required to optimum design that have a good grasp the deformation characteristic of the displacements and stresses distribution and predict variation of the effective width for serviceability loading. This research addresses the effective width of all composite material box girder bridges using the finite element method. The characteristics of the effective width of composite structures may vary according to several causes, e.g., change of fibers, aspect, etc. Parametric studies were conducted to determine the effective width on the stress elastic analysis of all composite materials box bridges, with interesting observations. The various results through numerical analysis will present an important document for construct all composite material bridges.

1. 서 론
2. 기본이론
3. 결과분석
4. 결 론
References

• 천경식(포스코건설 R&D센터 책임연구원) | Chun, Kyoung-Sik
• 지효선(대원대학교 철도건설학과 교수) | Ji, Hyo-Seon
• 박원태(공주대학교 건설환경공학부 교수) | Park, Won-Tae Corresponding author