本研究根據歐洲標準化組織EN 12512的規範，對應用於木構造柱梁的鋁合金接合件進行反覆加載的擬靜態試驗，求取降伏值、極限值、延展比及阻尼比。所需的單次加載試驗數據來源於前期研究，包括楊博馨（2022）和陳詩瀚（2023）的試驗結果，並進一步比較單次加載和反覆加載的破壞模式。
本研究的中長期目標是將此接合件應用於台灣的中低層木造建築，透過文獻回顧試體斷面選擇柱120*120及梁120*180 (mm)，為台灣木造建築常用之斷面。鋁合金接合件的扣合方式則轉化傳統木工燕尾榫的設計邏輯，透過工廠預製確保每個接點的性能表現穩定。本研究依據歐洲標準化組織的規範，對木結構中的金屬緊固件進行反覆加載試驗。透過建構試驗機制並評估其機械性能，旨在提供木結構工程更科學的結構設計數據。
往復加載的降伏剪力、極限剪力、勁度及延展比分別為8.19 kN、12.24 kN 4.61 kN/mm 及7.33，為單次加載的95%、92%、88%、77%，材料的損傷累積、應力集中以及木材的天然缺陷在反覆加載歷程中產生內部微小裂縫並逐漸擴展，使得自攻螺絲與周邊的木纖維原先產生的摩擦力減弱使自攻螺絲拔出。這些弱點在累積損傷和塑性變形將會降低整體強度和剛度；往復加載的降伏彎矩、極限彎矩、勁度及延展比分別為1.98 kN 、2.24 kN 、110.87 kN -m及1.94，為單次加載的122%、120%、127%、94%，單次加載的主導破壞模式為螺絲的拔出，反覆加載的主導破壞模式為接合件脫開及螺絲的拔出，不同的主導模式將導致強度差異，且在單次載重中，木材內部的殘餘應力可能會限制其變形能力，而反覆載重過程中，這些殘餘應力會逐漸被釋放，使得木材能夠承受更大的變形和載重，從而提高極限彎矩。反覆加載可能會使延展比下降，脆性破壞增加以及損傷累積會導致木材更早進入破壞階段，進而降低其延展性。剪力試驗的延展比與單次加載相比減少了23%，而旋轉試驗的延展比與單次加載相比減少了6%。反覆加載出現單次加載所沒有的破壞模式。在剪力試驗強度下降，在旋轉試驗強度上升，因此提出後續試驗相關建議以釐清受力機制並提升反覆載重下強度及延展比，並減少強度和剛度的退化以利提升接點耗散能量的能力。
本研究建立運用在木結構之金屬緊固件反覆加載的試驗機制，並與單次加載數據和破壞模式進行比較，提供鋁合金接合件更完整的分析流程。

The study based on EN 12512 standards, conducted quasi-static cyclic loading tests on aluminum alloy joints used in timber post-and-beam structures to determine yield values, ultimate values, ductility ratios, and equivalent viscous damping. Data from previous single loading tests by Yang (2022) and Chen (2023) were used to compare failure modes under single and cyclic loading. The mid-to-long-term goal is to apply these joints in low-rise timber buildings in Taiwan. Sections of 120x120 mm for columns and 120x180 mm for beams were selected, commonly used in Taiwanese timber structures. The aluminum joints, inspired by traditional dovetail designs, ensure stable performance through prefabrication.
The cyclic loading tests showed yield shear force, ultimate shear force, stiffness, and ductility ratio as 8.19 kN, 12.24 kN, 4.61 kN/mm, and 7.33, respectively—95%, 92%, 88%, and 77% of single loading values. Damage accumulation and stress concentration in cyclic loading caused micro-cracks, weakening friction and screw pullout. For bending tests, yield moment, ultimate moment, stiffness, and ductility ratio were 1.98 kN, 2.24 kN, 110.87 kN-m, and 1.94—122%, 120%, 127%, and 94% of single loading values. Cyclic loading induced different failure modes, reducing ductility and increasing brittleness. In shear tests, strength decreased, while in rotational tests, strength increased. Therefore, further tests are recommended to clarify the loading mechanisms.
This study established a testing mechanism for cyclic loading of metal fasteners in timber structures, comparing it with single loading data to provide comprehensive analysis for aluminum joints.

陳詩瀚（2023）。木構造柱梁接點以鋁合金接合件及竹板加固的抗剪與旋轉性能〔未出版之碩士論文〕。國立成功大學建築研究所，台南市。
楊博馨（2022）。金屬接點開發應用於木構造柱梁接合與其彎矩及剪力行為〔未出版之碩士論文〕。國立成功大學建築研究所，台南市。
葉民權、林玉麗、顏大翔、林秀鑾（2019）。應用自攻螺絲於直交集成板接合之剪斷抵抗探討。台灣林業科學，34（3），179-195。
He, M. J., Liu H. F. (2015). Comparison of glulam post-to-beam connections reinforced by two different dowel-type fasteners. Construction and Building Materials, 99, 99-108. https://doi.org/10.1016/j.conbuildmat.2015.09.005
Huang, Z., Chen, Z., Huang, D., Chui Y. H. (2019). Cyclic loading behavior of an innovative semi-rigid connection for engineered bamboo-steel hybrid frames. Journal of Building Engineering, 24, 100754. https://doi.org/10.1016/j.jobe.2019.100754
Krauss K., Li M., Lam F. (2023). Influence of mixed-angle screw installations in CLT on the cyclic performance of commercial hold-down connections. Construction and Building Materials, 364, 129918. https://doi.org/10.1016/j.conbuildmat.2022.129918
Li, H., Lam, F., Qiu H. (2019). Comparison of glulam beam-to-beam connections with round dovetail and half-lap joints reinforced with self-tapping screws. Construction and Building Materials, 227, 116437. https://doi.org/10.1016/j.conbuildmat.2019.07.163
Li, Z., Wang, X., He, M, J., Shu, Z., Huang, Y., Wu, A., Ma Z. (2021). Mechanical performance of pre-fabricated metal dovetail connections for Cross-Laminated Timber (CLT) structures. Construction and Building Materials, 303, 124468. https://doi.org/10.1016/j.conbuildmat.2021.124468
Masaeli M., Gilbert B. P., Karampour H., Underhill I. D., Lyu C. H., Gunalan S. (2020). Scaling effect on the moment and shear responses of three types of beam-to-column connectors used in mass timber buildings. Engineering Structures, 208, 110329. https://doi.org/10.1016/j.engstruct.2020.110329
Pirmoz, A., Liu, M. (2017). Direct displacement-based seismic design of semi-rigid steel frames. Journal of Constructional Steel Research, 128, 201-209. https://doi.org/10.1016/j.jcsr.2016.08.015
Thoma, T., Lam, F., Vallée, T. (2011). Structural performance of rounded dovetail connections: experimental and numerical investigations. European Journal of Wood and Wood Products, 69(3), 471-482. https://doi.org/10.1007/s00107-010-0459-1
Tomasi R., Crosatti A., Piazza M. (2010). Theoretical and experimental analysis of timber-to-timber joints connected with inclined screws. Construction and Building Materials, 24(9), 1560-1571. https://doi.org/10.1016/j.conbuildmat.2010.03.007
Yan Z., Ottenhaus, L. M., Leardini, P., Jockwer, R. (2022). Performance of reversible timber connections in Australian light timber framed panelised construction. Journal of Building Engineering, 61, 105244.https://doi.org/10.1016/j.jobe.2022.105244