台灣傳統建築直榫木接頭力學行為研究

Studies of the Mechanical Behavior of Tenon and Mortise Wood Joints Used in Traditional Taiwanese Construction

李佳韋(Chia-Wei Lee) ； 林金祿(Chin-Lu Lin) ； 林敏郎(Min-Lang Lin) ； 黃世建(Shyh-Jiann Hwang) ； 蔡明哲(Ming-Jer Tsai)

《台灣林業科學》 22卷2期 (2007/06) Pp. 125-134

https://doi.org/10.7075/TJFS.200706.0125

摘要

The purpose of this study was to investigate the mechanical behavior of tenon and mortise wood joints used in traditional Taiwanese wood structures by cyclic loading and lateral loading. The maximum moment and rotational stiffness (K) were defined as the joint strength. Experimental results revealed that the M(subscript max) and K values of the ”through tenon” (CT) were greater than those of the ”straight tenon” (CH) and ”stepped dovetail tenon” (CS), mainly because of the longer tenon length of the CT. The average M(subscript max) and K values among the various joints showed the following trend: CT＞CS+(direction of the joint against the external force)＞CH＞CS-(direction of the wood block in the joint against the external force). In comparisons of the average M(subscript max) and K values of CH specimens, the average M(subscript max) value for CT specimens was 350% higher, whereas the average K value was 320% higher (calculated by the 2-point-slope method). The strength of the CS which is the common joint resisting lateral forces was stronger than that of the CH with the same tenon length. It was also found that the K value increased with an increase in M(subscript max).

關鍵字

大木結構 ； 榫卯 ； 最大彎矩 ； 旋轉勁度

並列摘要

The purpose of this study was to investigate the mechanical behavior of tenon and mortise wood joints used in traditional Taiwanese wood structures by cyclic loading and lateral loading. The maximum moment and rotational stiffness (K) were defined as the joint strength. Experimental results revealed that the M(subscript max) and K values of the ”through tenon” (CT) were greater than those of the ”straight tenon” (CH) and ”stepped dovetail tenon” (CS), mainly because of the longer tenon length of the CT. The average M(subscript max) and K values among the various joints showed the following trend: CT＞CS+(direction of the joint against the external force)＞CH＞CS-(direction of the wood block in the joint against the external force). In comparisons of the average M(subscript max) and K values of CH specimens, the average M(subscript max) value for CT specimens was 350% higher, whereas the average K value was 320% higher (calculated by the 2-point-slope method). The strength of the CS which is the common joint resisting lateral forces was stronger than that of the CH with the same tenon length. It was also found that the K value increased with an increase in M(subscript max).

並列關鍵字

wood structure ； tenon and mortise ； maximum moment ； rotational stiffness