It is difficult to construct a rigid frame structure without seismic walls and bracing because of the difficulty in ensuring the strength and rigidity of the joints. In the previous paper, dog bone timber-steel hybrid connections, which consist of a dog bone part and a timber-steel hybrid connection that transfers the bending moment of the laminated timber beam to the steel, is proposed. The proposed connection has enabled the realization of a structure with sufficient strength, stiffness and toughness, but the deformation capacity of the connection has not been studied for another cross-sectional dimensions. In this study, based on the previous evaluation equations, an analytical method to derive the history of the M-q relationship by increasing the angle q of the core of the laminated wood to the H-shaped steel of the wood-steel joint, taking the shear force and a single neutral axis calculation were performed to obtain the rotational stiffness Kw, the yielding bending moment My, and the ultimate bending moment Mu of the timber-steel hybrid connection. The validity of the shear force evaluation method and the effect of shear force on the hysteresis properties of the timber-steel hybrid connection are discussed. Four different test specimens (MD600, MD360, CD360 and MS360) are fabricated for the proposed connection with both flanges fixed by lag screws to increase the stiffness and strength of the wood-steel joints. The MD600 is 600 mm height of glued wood and has two bodies with monotonic loading, and the MD360 is 360 mm height of glued wood and has two bodies with monotonic loading. The CD360 is 360 mm height of glued wood and has three bodies with cyclic loading. The MS360 is strength tests of timber-steel hybrid connections, which is 360 mm height in glued wood and has three bodies with monotonic loading. From the joint bending tests, the hysteresis properties and plastic deformation capacity of the proposed connections with dog bone are verified, while the stiffness and holding strength of the timber-steel hybrid connection are verified. As results, the following conclusions are obtained:
1) In the joint bending tests, it was confirmed that the dog-bone part plasticized while wood part is in elastic range for all the test specimens with dog-bones (MD600, MD360, CD360), and that the dog-bone portion was stable and had an excellent plastic deformation capacity exceeding the plasticity ratio of 5. In the MS360 test case, the strength of the wood joint was superior to that of the dog-bone in both stiffness and flexural strength.
2) A new evaluation method that takes into account the shear forces on the wooden joints is proposed and it is confirmed that the proposed method can roughly reproduce the hysteresis properties of the joints. It was confirmed that the proposed method was able to simulate the historical properties of the joints in general, although the effect of shear forces was not so great and the flexural strength of the joints could be reduced by shear forces.
