抄録
Authors have shown effectiveness of approximate solution with beam-model by the previous shear tests and analytical studies1) on the drift-pin joints with the inserted steel plate of grain orientation and perpendicular to the grain. This paper reports the experiment and analysis of moment-resisting joints with drift-pin joints with the inserted steel plate. There is a drift-pin in the force application direction which is an arbitrary angle φ (hereinafter the same angle) with respect to the grain direction at the rotary joint portion, and the stiffness and stress in the force direction are obtained by the Hankinson's equation5). The joint arrangements with the drift-pin φ 12 and φ 16 are circular and rectangular. Experiments of five test species of symmetric different grade composed glued laminated timber of European red pine and Japanese cedar were conducted. Hankinson's equation was used to calculate embedding stiffness for any slip angle φ. The applicability of non-linear stiffness and deformation anisotropy was examined. The moment resisting joint considering the laminas for symmetric different grade composed glued laminated timber was analyzed. The experiment's and analysis' results with embedding strength formulas (F3, F6) influencing embedding properties of the previous report were compared. modeling the M-θ restoring force the moment-resisting joint was derived from the M-θ's relationship that only moment works. Experiments were carried out on the moment-resisting joints with drift-pin joints with the steel plate inserted and compared with the analysis results, the followings could be confirmed.
(1) About the experiment
In the cantilever type experiment, the M-θ curves according to experimental results tend to be almost same. In the experiment, deformation due to initial backlash occurs, and the deformation amount is small in Nos. 1 to 3 using the drift pin φ 12, but it increases in No. 4 and No. 5 using φ 16.
(2) About analysis results
Form the analysis results that only the moment acts on the moment resisting joint, the following could be confirmed. For the non-linear analysis of the drift-pin joint with the any slip angle φ, it is effective to use Hankinson's equation (n = 2.0) where the displacement of any slipping point is component displacement for 0° or 90°. It was confirmed that the M-θ curves are roughly between the analysis results using the embedding strengths F3 and F6. It is difficult to judge ultimate strength and each displacement, The M-θ curves after splitting can be estimated by M-θ analysis considering reduction in strength due to split fracture at large deformation by effective joint drift pin analysis after splitting. Judgment at the point of splitting is important. Bending deformation is dominant at the joint, and deformation due to the shear force Q is small. The M-θ relationship of the joint is less affected by the presence of Q and N. However, the M-θ relationship of each joint element changes with influence of Q and N. It is important to consider the deformation of the joint element for calculating the flexural strength at the time of damage limit and safety limit.
