A Study on the Prestressing Effect of Three Span Continuous Preflex Composite Bridges by Lifting Two Supports

2지점 상승.하강에 의한 3경간 연속 프리플렉스 합성보의 Prestressing 효과에 관한 연구

This study presents the concept and the effects of the lifting two supports method that makes get economical design sections and efficient stress condition. The analysis of relation between critical sections and ratios Is done. Also, connection between critical sections and design variable is analyzed. In order to resolve the effects of the lifting two supports method, sections which was designed with the existing method, lifting support method, are used. Finally, it is proved that the new method is more efficient than the existing methods in economy and structure.