Recently, a new long span composite rahmen bridge has been developed to complement the short span concrete rahmen bridges. In this study, a static bending test was carried out for steel composite rahmen bridges developed for the purpose of decreasing negative moment at the end of steel girder and positive moment at the center of steel girder by introducing a horizontal prestress to the upper flange of the steel girder end. From this, the reinforcement effect of the introduction to the horizontal prestress was verified and the structural safety for the steel composite rahmen bridges was evaluated. As a result, the maximum tensile strain and the maximum compressive strain of the DL specimen at 800 kN were 16% and 12% smaller than those of the CR specimen, respectively. From this, the DL specimen decreased compressive strain due to the tensile strain of the upper flange caused by introducing the horizontal prestress at the end of the steel girder, and the tensile strain of the lower flange also decreased.

• 조대일(한국교통대학교 토목공학전공 박사수료) | Cho, Dae-Il (MS, Department of Civil Engineering, Korea National University of Transportation)
• 이승용(한국교통대학교 토목공학전공 교수) | Lee, Seung-Yong (Professor, Department of Civil Engineering, Korea National University of Transportation) Corresponding author