Experimental and Analytical Studies on Optimum Dimension of a T-type Wood Joint.

本课题的目的是明确日本木结构中常用的T型木接头的最佳尺寸。通过试验测试和计算机模拟，对接头的最佳尺寸进行了研究。主要研究结果如下：1.节点试件静载试验结果。无论是垂直（拉伸或压缩）或水平载荷施加单调的标本，和强度性能的联合调查有关其尺寸。明确了连接中榫的最佳尺寸在<mm>51 × 51<mm>或72<mm>之间，比普通榫的尺寸大.动态载荷试验结果。在试件的柱端垂直施加频率为5Hz的正弦波交变载荷。结果表明，载荷幅值与疲劳寿命的对数近似成线性关系，且接头中开口销截面积为25平方时疲劳寿命最长<mm>.计算机模拟的结果。对木节点内部的应力进行了二维和三维分析，其结果与上述实验结果定性地吻合较好，从而得出结论：将上述实验与计算机模拟技术相结合，将有助于确定各种木节点的最佳尺寸。

The purpose of this project is to clarify the optimum dimension of a T-type wood joint used commonly in Japanese wood construction. Investigations for this have been carried out through the experimental tests and computer simulation of the optimum dimension of the joint. The results obtained are as follows:1. Results of staic loading tests of the joint specimens. Either vertical(tension or compression ) or horizontal load was applied monotonically to the specimen, and strength properties of the joint were investigated in relation to its dimension. Then it was clarified that the optimum dimension of the tenon in the joint was nearly in the range of 51_<mm> by 51_<mm> or 72_<mm>, which was bigger than the common tenon.2. Results of dynamic loading tests. Alternating load with the frequency of 5 Hz and sine wave was applied vertically to the end of the column of the specimen. Then it was recognized that the relationship between load amplitude and logarithm of fatigue life was nearly linear, and that the fatigue life was the longest in the case of 25_<mm> square of the cross section of the cotter in the joint.3. Results of computer simulation. Two and three dimensional analyses of stresses within the joint were executed, and the results showed a good concidence with those of the experiments above, qualitatively.Thus it is concluded that the combination of the experimental and computer simulation techniques above used would be much useful for clarifying optimum dimension of various wood joints.