直交集成板（Cross-laminated timber, CLT）為近年來受到關注的工程木材之一，CLT結構系統仰賴金屬連接件做接合，但於既往CLT搭配金屬連接件之接頭研究顯示，最終破壞常發生於木材撕裂、非彈性承壓或自攻螺絲拔出等，導致接頭阻尼比較低、耗能表現差且於反覆加載時經常出現強度與剛度的衰減明顯(Pinching)，因此本研究設計了可運用於CLT接頭之新型抗拉高耗能連接件與抗剪高耗能連接件並提出力學模型評估式，並進行實驗以了解其力學行為與性能表現。實驗共分成三組，分別為抗拉阻尼連接件及抗剪阻尼連接件，後者分別以自攻螺絲(Screws)安裝與以金屬摩擦栓(Dowel)安裝兩種方式，以下分三組說明:

1. 抗拉阻尼連接件為切削鋼板，使非彈性行為集中於鋼材切削處而提供阻尼效果，實驗結果顯示切削段鋼板與自攻螺絲群極限強度比值為0.5時，可使變形集中於鋼板，各振幅第一次加載之平均等效阻尼比均可達15%以上，實驗最終於位移20mm左右切削鋼板拉斷而導致破壞。
2. 抗剪阻尼連接件透過將連接件鋼板切縫調整剪力牆、剛度以及耗能能力，預期使非彈性行為集中於切縫鋼板而提供阻尼效果，實驗結果顯示以自攻螺絲安裝的組別，切縫鋼板與自攻螺絲群降伏強度比小於0.5時能使變形集中於切縫鋼板連桿處，避免自攻螺絲群旋轉變形，表現優異的耗能能力，也可降低二次加載時強度束縮(Pinching)現象。
3. 抗剪阻尼連接件以金屬摩擦栓安裝的組別，因CLT板提供了連接件面外方向束制效果，連接件不易挫曲及面外扭轉，切縫鋼板與摩擦栓降伏強度比小於0.7時能使變形集中於切縫鋼板連桿處，避免摩擦栓變形，表現優異的耗能能力，也可降低二次加載時強度束縮現象。

Two types of steel connectors for cross-laminated timber(CLT) system have been proposed in the study. They are designed for resisting tension and shear forces transferred in the plates, respectively. The former one has reduction area in the center and the later one is cutted with slits so that the plastic deformation would mostly focus on these area instead of the mounting area. In this way the connectors are supposed to generate higher energy dissipation in the seismic loadings. Cyclic loading tests were conducted to evaluate their performance and capacity. The corresponding mechanical model evaluation methods are provided and verified basing on the test results.
The experimental results showed that the tension-resisted connector designed as cutting steel plate can effectively concentrate the deformation on steel instead of wood, and improve the energy dissipation performance of the connector. The average equivalent damping ratio(\xi_{eq}) is more than 15%, but the buckling resistant device still needs to be further improved; The shear-resisted connector is designed as a slits steel plate, which can make the deformation focus on the links in the slits steel plate, so that it has good energy dissipation capacity without attenuation of strength and stiffness. The final faliure is the fracture of the links. The shear-resisted connector installed with steel dowels have better energy dissipation capacity and performance,because CLT plates provide out-of-plane restraint effect, so that connectors are not prone to buckling and torsion.

[1] Hummel J, Seim W. Assessment of dynamic characteristics of multi-storey timber buildings. 2016 World Conference on Timber Engineering, Vienna, Austria. 2016.
[2] Shen YL, Schneider J, Tesfamariam S, Siegfried FT, Mu ZG. Hysteresis behavior of bracket connection in cross-laminated timber shear wall. Constr Build Mater48:980-91. 2013.
[3] 邱立文、黃群修、吳俊奇、謝小恬。第 4 次全國森林資源調查成果概要。 臺灣林業 41(4):3–13。2015。
[4] 陳勁豪。柳杉在不同生育地及疏伐作業之材質探討。國立臺灣大學森林環境暨資源學研究所博士論文。2009。
[5] Kenji KOBAYASHI et al. New estimation method on stiffness and strength of single-shear screw joints with structural panels. 2007 Journal of Structural and Construction Engineering (Transactions of AIJ) 72(622):121-128. 2007.
[6] Toko Hitaka , Chiaki Matsui . Experimental Study on Steel Shear Wall with Slits. Journal of Structural Engineering Vol. 129, Issue 5. 2003.
[7] 林志憲。國產木材於直交集成板之製造及其工程性能評估。國立中興大學森林學研究所博士論文。2020。
[8] Igor Gavric, Ario Ceccotti, Massimo Fragiacomo. Experimental cyclic tests on cross-laminated timber panels and typical connections. XIV Convegno ANIDIS. Bari, Italy. 2019.