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Title |
Fatigue Durability of Cramp Joint at Precast Highway Deck Slabs
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Keywords |
클램프 조인트 ; 피로 내구성 ; 현장 조인트 ; 프리캐스트 바닥판 ; Cramp joint ; Fatigue durability ; Field joint ; Pre-cast slabs |
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Abstract |
The fatigue durability test using the actual size beam was performed with a cramp joint in order to apply to the highway bridge deck slab. Three types of beam were investigated for durability performance by considering stress conditions in real bridge deck slabs, 1) A beam with major shear force applied at the joint (RC Type) 2) A beam with major bending moments applied at the joint (PSC Type) 3) A beam with the pure shear applied at the joint. The experiment for beams with cramp joints showed that the cramp joint had enough durability for fatigue regardless of the overlaid length of the looped distribution bars under the current design strength level. Moreover, it was clarified that the enough durability for fatigue under the load repetition was achieved by increasing the joint span grater than 1.5D with the consideration of the deformation due to reduction in joint stiffness.
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