| Title |
An Experimental Study of Demountable Bolted Shear Connectors for the Easy Dismantling and Reconstruction of Concrete Slabs of Steel-Concrete Composite Bridges |
| Authors |
정대성(Jung, Dae Sung) ; 박세현(Park, Se-Hyun) ; 김태형(Kim, Tae Hyeong) ; 김철영(Kim, Chul Young) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.6.0751 |
| Keywords |
강합성 교량; 용접접합 머리붙이 스터드; 볼트접합 전단연결재; 분리식 전단연결재; 수평전단실험 Steel-concrete composite bridge; Welded head stud; Bolted shear connector; Demountable shear connector; Horizontal shear test |
| Abstract |
Welded head studs are mainly used as shear connectors to bond steel girders and concrete slabs in steel-concrete composite bridges. For welded shear connectors, environmental problems include noise and scattering dust which are generated during the removal of damaged or aged slabs. Therefore, it is necessary to develop demountable shear connectors that can easily replace aged concrete slabs for efficient maintenance and thus for better management of environmental problems and life cycle costs. The buried nut method is commonly studied in relation to bolted shear connectors, but this method is not used in civil structures such as bridges due to low rigidity, low shear resistance, and increased initial slip. In this study, in order to mitigate these problems, a demountable bolted shear connector is proposed in which the buried nut is integrated into the stud column and has a tapered shape at the bottom of an enlarged column shank. To verify the performance of the proposed demountable stud bolts in terms of static shear strength and slip displacement, a horizontal shear test was conducted, with the performance outcomes compared to those of conventional welded studs. It was confirmed that the proposed demountable bolted shear connector is capable of excellent shear performance and that it satisfies the slip displacement and ductility design criteria, meaning that it is feasible as a replacement for existing welding studs. |