本研究旨在探討鳩尾榫接框架結構之扭力強度，研究之以山毛櫸、柳桉木、花旗松等三種材料為實驗基材，透過萬能試驗機拉力破壞實驗，獲得鳩尾榫接框架結構之拉力強度值；並探討拉力強度與木材硬度，紋理斜率等之相關性。
本研究重要結果摘要如下：
一、山毛櫸之鳩尾榫接框架結構其拉力強度破壞平均負荷為1227.67kg-f 是三組試件材料承受拉力強度最大的一組。
二、柳桉木之鳩尾榫接框架結構，其拉力強度破壞平均負荷為972kg-f 其承受拉力強度破壞小於山毛櫸材料，而優於花旗松材料。
三、花旗松之鳩尾榫接框架結構，其拉力強度破壞平均負荷為829kg-f 是三組材料試件承受拉力強度破壞最小的一組。
四、本研究實驗之鳩尾榫框架結構（山毛櫸、柳桉木、花旗松），其拉力強度破壞負荷值與木材硬度成正比，硬度愈大之材種，其鳩尾榫接拉力強度愈大。
五、山毛櫸鳩尾榫接框架結構，其拉力強度大小與棒頭材料之端面硬度值、側面硬度、上面紋理、斜率等材料性質有顯著性相關。其原始分數迴歸方程式如下：Y(hat)=80.265HFA1+113.868HTA1+3271.782TRA1-1757.713。
標準分數迴歸方程式Z(hat)Y=0.470ZHFA1+0.932ZHTA1
六、柳桉木之鳩尾榫接框架結構，其拉力強度大小與棒頭材料上面之硬度值，側面紋理斜率等材料性質有顯著性相關，其原始分數迴歸方程式Y(hat)=366.14HRA1+3057.20TTA1-3251.62
標準分數迴歸方程式Z(hat)=1.049ZHRA1+0.637ZTTA1
七、花旗松之鳩尾榫接框架結構，其拉力強度大小與榫梢材料上面紋路斜率值，側面斜率值等材料性質有顯著性相關，其原始分數迴歸方程式Y(hat)=311.43TRA1+3697.57TTAI-2301.09
標準分數迴歸方程式Z(hat)Y=1.213ZTRA1+0.708ZTTA1
八、經本研究所獲重要結論為硬度高之材料，其機械性質大於硬度低的材料，又硬度高之材料，其鳩尾榫接框架結構強度優於硬度較低之材料。

The purpose of this study was to research on tension strength of the framework of dovetail joints and taking three kinds of materials as Beech, Lauan, and Fir Douglas, The experiment on breaking tension by a universal test machine in order to get tension strength of the framework of dovetail joints, and to research on the relationship among tension strength, hardness , and the Inclined rate of the grain. The important results of the experiment were:
1. The average load for the breaking tension strength of beech frame were 1227.67kg-f, which was strongest one of the three kinds of materials.
2. The average load for the breaking tension strength of lauan frame were 972kg-f, which was weaker than beech, but stronger than fir douglas.
3. The average load for the breaking tension strength of fir douglas frame were 829kg-f, which was the weakest one of the three kinds of materials.
4. The tension strength of the frame structure of dovetail joints, proved by experiments, was in direct proportion to the hardest of wood; that is, the harder of the wood is, the stronger of the tension of the dovetail joints is.
5. There were Significant relationship among surface grain, side of inclined rate of hardness and edge hardness in tension strength of tenon from beech frame. The raw score of
Regression formula as follows:
Y(hat)=80.265HAFA1+113.S68HTA1+7.82TRA1-1757.7137.
The regression formula of the standard score as follows:
Z(hat)=0.470ZHFA1+0.932ZHTA1
Z(hat)y=0.470ZHFA1+0.932ZHTA1.
6. There were significant relationship among side grain and surface hardness in tension strength of the Tenon from the Lauan frame.
The raw score of regression formula as follows:
Y(hat)=366.14HRA1+3057.20TTA1-325.62.
The regression formula of the standard score as follows:
Z(hat)y=1.049ZHRA1+0.637ZTTA1.
7. There were significant relationship among surface inclined rate and side of inclined rate in tension strength of the tenon from fir douglas.
The raw score of regression formula as follows:
Y(hat)=311.43TRA1+3697.5TTA1-2301.09.
The Regression formula of the Standard score as follows:
Z(hat)y=1.213ZTRA1+0.708ZTTA1.