Abstract
Shear experiments on mortise and tenon joints with top and bottom notches in the beam end were conducted with the length of the tenon as a variable. In addition, material experiments were performed to investigate the structural performance of the fracture modes of the joint. The experimental results show that when the lower notch at the beam end experiences splitting, the shear forces were identical for different tenon lengths and did not decrease. In addition, the deformation performance of the joint up to yielding was largely due to the compressive deformation perpendicular to the grain of the wood on the sides of the tenon. Based on the theory of the calculation method of the splitting strength of a notched beam, a formula for the splitting strength when the end of the beam is moment-resisting was proposed. It was confirmed that the proposed formula could estimate the shear force that caused the splitting fracture of the lower notch. In addition, the increase in shear force after the lower notch experienced splitting fracture was due to the increase in clamping force of the beam end due to rotational deformation.
Highlights
In Japan, there is a growing trend toward the use of wood in medium- to large-scale buildings
Glued laminated timber composed of mixed-grade laminae
The lower part of the beam end was in contact with the column as the beam end rotated due to bending deformation and deformation caused by cracking at the lower notch
Summary
In Japan, there is a growing trend toward the use of wood in medium- to large-scale buildings. As part of this trend, there has been a great deal of research on momentresisting timber joints. Some moment-resisting joints use joints that resist tensile axial forces, such as lag-screw bolts [2] and glued-in rods [3]. Such joints resist shear force through the friction of the compressive force at the end of the beam generated by bending.
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