MOMENT RESISTING TIMBER JOINTS WITH HIGH-STRENGTH STEEL DOWELS: NATURAL FIBER REINFORCEMENTS

摘要

Evaluation of cyclic behavior of moment resisting timber joints with high-strength dowels was carried out in this study. The evaluation was also extended to some joints that were locally reinforced with plywood, plybamboo and desinfied veneer wood (DVW). In addition, some joints with normal-strength dowels were prepared and tested using the same loading protocol for comparison. The high-strength dowels used in this study was 10.9grade bolts, the normal-strength dowels was 4.8grade bolts and the wood member was Abies sachalinensis glulam having oven-dry density of 339 kg/m . The test results of un-reinforced joints showed premature wood-splitting caused the effect of dowel grade on both moment resistance and hysteretic damping insignificant. However, in the case of reinforced joints, the increase of joint resistance or hysteretic damping was noticed especially in the joints with DVW reinforcements. Strength increase of the joints was found in the order: plywood-reinforced joints > plybamboo-reinforccd joints > DVW-reinforced joints, which could be inferred to be proportional to the reinforcements' embedding strength.