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Title |
Structural Performance Enhancement of Prestressed Steel-Composite Rahmen Bridges with T-wing Members
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Authors |
진현철(Hyun-Chul Jin) ; 노병철(Byeong-Cheol Lho) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.5.76 |
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Keywords |
강합성 라멘교; 프리스트레스; T-wing 부재; PS 강봉; 구조 거동 Steel-composite rigid frame bridge; Prestress; T-wing member; PS tendon; Structural behavior |
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Abstract |
The steel-composite rigid frame method maximizes structural efficiency by combining the high tensile strength of steel with the excellent compressive strength of concrete. Continuous development has been driven by its advantage of reducing construction time through the factory fabrication of steel girders. With the growing demand for low-profile, long-span structures in projects like river maintenance, this method is increasingly being applied to bridges with spans exceeding 40 meters. This study proposes and evaluates the T-wing PS (Prestressed) steel-composite rigid frame method, which enhances structural efficiency by installing a transverse T-shaped member (T-wing) at the girder ends and introducing prestress using PS steel rods. To analyze its structural behavior, a finite element analysis was conducted for comparison with conventional methods, and a static loading test was performed to verify its actual performance. The numerical analysis of a 40-meter span bridge showed that the T-wing method (with four PS rods) reduced the positive moment at mid-span by approximately 29% compared to a non-prestressed frame and by 17% compared to a conventional method using two PS rods. The static loading test recorded a maximum load of 523 kN and a maximum deflection of 58 mm, with the PS rods exhibiting uniform linear strain, confirming that no eccentric behavior occurred in the T-wing member. Through this numerical and experimental verification, it was demonstrated that the T-wing PS steel-composite rigid frame method effectively enhances structural performance through prestressing and exhibits stable behavior under external loads, proving its suitability for rigid frame structures.
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