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Title |
Structural Characteristics Analysis of Steel Box Girder Bridge being stressed the PS Steel Wires at the Upper Slab of the Intermediate Support
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Authors |
차태권(Tae-Gweon Cha) ; 장일영(Il-Young Jang) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.2.1 |
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Keywords |
인장균열; 설계인장강도; PS 강선 긴장; 압축응력을 도입 Tension cracks; Design tensile strength; PS steel wire tension; Introducing compressive stress |
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Abstract |
The concrete deck slab at the continuous span support of the steel box girder bridge is a structure that is combined with the upper flange. It is a structure that can cause tension cracks in the deck slab at the support causing problems such as durability degradation in long span bridges. This is because the tensile stress in the longitudinal direction of the slab exceeds the design tensile strength due to the effects of dead load and live load when applying a long span. Accordingly, it is necessary to control tensile cracking by adding a reinforcing bar in the axial direction to the slab at the support and to introduce additional compressive stress. To solve this problem, a structural system of a steel box girder bridge was proposed that introduces compressive stress as PS steel wire tension in the tensile stress section of the upper slab in the continuous support. The resulting structural performance was compared and verified through the finite element analysis and the steel wire tension test of the actual specimen. By introducing compressive stress that can control the tensile stress and cracking of the slab generated in the negative moment through the tension of the PS steel wire, it is possible to improve structural safety and strengthen durability compared to the existing steel box girder bridge.
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