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- 저자 : Changyuan Dai (검색결과 2 건)
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Changyuan Dai,Qingtian Su,Changyu Shao,Chunlei Zhang 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.2
The outer lanes and emergency lanes of the bridge deck of long-span bridges in which orthotropic steel deck is adopted were replaced with Ultra-High-Performance-Concrete (UHPC) composite deck to create a hybrid bridge deck system. A transverse connection detail was proposed to connect the two diff erent bridge deck forms. Static bending tests and theoretical analysis were conducted on the transverse connection detail to obtain failure modes, ultimate load-carrying capacity, crack resistance, and the collaborative bending performance under positive and negative moments. A calculation method for the ultimate load-carrying capacity considering residual stresses in the UHPC after cracking was provided. The results show that the transverse connection detail has good plastic deformation capacity and collaboratively supports both sides of the bridge deck. The error in predicting the ultimate load-carrying capacity of specimens under positive bending moments using the proposed theoretical calculation method is 3.9%, and for specimens under negative bending moments, the load-carrying capacity is controlled by local buckling of the steel, with a 3.1% diff erence between theoretical and measured values.
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Chunlei Zhang,Changyu Shao,Qing-Tian Su,Changyuan Dai 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.3
Orthotropic steel–concrete composite bridge deck is a structure composed of an orthotropic steel bridge deck and a cement-based rigid overlay. In recent years, it has been increasingly used to strengthen existing steel decks and build new bridges. Although composite decks with various structural forms and materials have been widely used, studies on the structural behavior of composite bridge decks are still somewhat lacking, and the design approach has not been fully clear. In this study, the mechanical behaviors of a composite bridge deck composed of 80 mm steel-fiber-reinforced concrete (SFRC) and longitudinal bulb-flat ribs were investigated under negative bending. Loading tests of two full-scale composite decks were carried out to study the variations of stiffness, concrete cracks, and structural strain during the loading process. The elastoplastic cross-sectional analysis method and the rigid-plastic analysis method were used in theoretical calculation and the results were compared with the experimental results. It was found that when the composite bridge deck was subjected to negative bending, both the structural deformation and strain variation showed two stages, i.e., elastic stage and elastic–plastic stage, indicating good ductility. In the ultimate failure state, the longitudinal bulb-flat ribs buckled, and the adverse effect of the buckling on bending resistance was revealed. The contribution of the tensile strength of SFRC to the bending resistance was also studied. Furthermore, a new calculation method for the negative bending resistance of this type of composite decks was proposed.
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