臺灣傳統鉤逗榫及踏步燕尾榫力學特性之研究

Mechanical Characteristics of Traditional Go-Dou and Stepped Dovetail Timber Connections in Taiwan

張紋韶(Wen-Shao Chang) ； 徐明福(Min-Fu Hsu)

《台灣林業科學》 20卷1期 (2005/03) Pp. 61-71

https://doi.org/10.7075/TJFS.200503.0061

摘要

木接榫是影響木構造結構行為的一個重要因子，而在過去都被視為鉸接。近來國內木構造接榫研究已越來越受重視，且大多集中在穿斗式木構架面內接榫中。作為拉繫功能及提供構架面外勁度的鉤逗榫及踏步燕尾榫的力學特性至今尚未被深入研究，因此本研究目的在針對此兩類接榫進行力學研究。本研究規劃30組足尺接榫試體，並針對其做彎矩試驗，利用統計的方法探討其旋轉勁度、極限彎矩的預測方法，並比較不同接榫在往覆載重下的勁度衰減率。在分析實驗資料後，本文除了得到鉤逗榫及踏步燕尾榫極限彎矩及旋轉勁度的預測式，並瞭解到踏步燕尾榫較之鉤逗榫有較大的極限彎矩，且在梁深較深的情形下旋轉勁度亦會明顯較高。此外，踏步燕尾榫在往覆載重下亦有較低的勁度衰減表現。

關鍵字

傳統木構造 ； 半剛性接榫 ； 遲滯模式

並列摘要

Timber joints are one of the major factors that affect the structural behaviour of timber construction. Research on timber joints has attracted more attention recently in Taiwan. Several types of timber joints were investigated during the past two years, however, the go-dou and stepped dovetail connections, which are usually used to connect frames together and provide out-of-plane stiffness to timber frames, have not yet been studied. The purpose of this paper was to investigate the structural behaviour of these types of timber joints. First, 30 full-scale specimens were tested to study the rotational stiffness of the timber joints. Second, prediction models for rotational stiffness and the ultimate moment capacity of these two types of joints were established based upon a statistical approach. Last, stiffness degradation with cyclic loading was discussed. The results of this paper show that stepped dovetail connections have better performance than did go-dou connections in both ultimate moment capacity and stiffness degradation. In addition, for joints with a deep beam, the rotational stiffness of stepped dovetail connections was higher than that of go-dou connections.

並列關鍵字

traditional timber structures ； semi-rigid joints ； hysteretic loop