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

本项目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。通过实验试验和计算机模拟对接头的最佳尺寸进行了研究。得到的结果如下：1。节理试件静载试验结果。无论是垂直（拉伸或压缩）或水平荷载单调地施加到试样上，并研究了节点的强度特性与其尺寸的关系。结果表明，接头中榫的最佳尺寸在51 <mm> × 51 <mm>或72 <mm>范围内，均大于普通榫2。动态加载试验结果。在试件柱端垂直施加频率为5 Hz的正弦波交变荷载。结果表明，载荷幅值与疲劳寿命对数之间的关系近似为线性关系，当接头槽截面为25_<mm>平方时，疲劳寿命最长。计算机模拟结果。对接头内应力进行了二维和三维分析，结果与上述实验结果定性吻合较好。因此，将上述实验技术与计算机模拟技术相结合，将有助于明确各种木材节点的最佳尺寸。

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.