Keiichi Katori

DIRECT SHEAR TRANSFER MECHANISM BETWEEN CONCRETE AND GLUED LAMINATED TIMBER BY SHEAR KEY

The authors have planned to develop hybrid structure formed by reinforced concrete columns and glued laminated timber beams. To connect concrete the columns and timber beams, the shear force should be transferred at the joints directly by certain mechanism. The authors have planned to transfer the shear force using shear key formed by concrete and timber as a direct shear transfer mechanism. To verify whether the mechanism would be effective or not, the authors performed direct shear experiments. The specimens were made using normal strength concrete and Japanese cypress laminated timber, which had no reinforcing bars in the concrete of the shear keys. The ratio of the length (h) to the thickness (t) of the shear key was selected as a parameter of the specimens, being varied from 3 to 7. The experimental results are reported in this paper, from those results the authors derived the following conclusions; 1. The shear force could be transferred by the expected shear transfer mechanism using the shear key formed by the concrete and the timber. 2. Different failure modes were observed in the specimens by varying the ratio of h/t. When the ratio of h/t was 4 or lower, the shear key failed in shear at the bottom, while the shear key failed in compression at the side area in case of the ratio being 5, though the concrete part of the shear key did not fail when the ratio was 6 or higher.