柳杉集成材梁與梁之接合強化技術開發

Development of the Reinforcement Techniques for Japanese Cedar Glulam Beam-Beam Connections

葉民權(Min-Chyuan Yeh) ； 林玉麗(Yu-Li Lin) ； 陳怡臻(Yi- Jhen Chen) ； 郭啟一(Chi- Yi Kuo) ； 林育丞(Yu- Cheng Lin)

《林產工業》 36卷1期 (2017/03) Pp. 1-12

https://doi.org/10.6561/FPI.2017.36(1).1

摘要

本研究探討以結構用集成材在縱向接合條件下，運用結構用自攻螺絲之補強方法對接合性能與梁構材抗彎性能之影響，利用國產柳杉造林木製造E85-F255 等級結構用集成材，以金屬連結件及插銷進行縱向接合成135×304×6000 mm 實大梁，在接合處以8×280 mm 結構用自攻螺絲補強後進行四點彎曲試驗。結果顯示梁接合部經過兩對結構用自攻螺絲預先補強者，其最大載重容量、降伏彎矩、極限彎矩與能量散逸均提升30%以上，補強四對者可提升50%以上。縱向接合梁經彎曲破壞後以四對自攻螺絲補強者其降伏彎矩及極限彎矩高於對照組26%及17%，而補強兩對之條件則能恢復86%及94%。在縱向接合梁之抗彎性質方面，預先補強兩對及四對結構用自攻螺絲之條件，其抗彎強度分別可提升32%及55%。接合梁經彎曲破壞後再補強，則平均可回復抗彎彈性模數56%，而抗彎強度則可回復至對照梁構材之強度。

關鍵字

結構用集成材 ； 接合補強 ； 自攻螺絲 ； 接合強度

並列摘要

Effect of the structural glulam's beam-beam connections reinforced with structural self-tapping screws on the joint performance and bending properties was investigated in this study. Structural glulam members of E85-F255 grade were fabricated from domestic Japanese cedar plantation timber. The glulam members were longitudinally connected with a slotted metal connector and pins into a full size of 135×304×6000 mm beam. A four-point bending test was performed after the beam reinforced with 8×280 mm self-tapping screws at the connection. The experimental results showed that the maximum load capacity, yield bending moment, ultimate bending moment, and energy dissipation of glulam beams were improved 30 and 50% as the connections were pre-reinforced with the structural self-tapping screws by two pairs and four pairs, respectively. In a case of the failed glulam beams retrofitted by four pairs of self-tapping screws at the connection after a bending test, the yield bending moment and ultimate bending moment could be 26% and 17%, respectively, higher than those of the control beam members. While a recovery of 86% and 94% or higher could be reached for the failed glulam beams retrofitted by two pairs of self-tapping screws. In a case of the bending properties of longitudinally connected glulam beams, the bending strength of the beam was improved 32% and 55% as the connections were pre-reinforced with two and four pairs of self-tapping screws, respectively. Further, the failed glulam beams retrofitted by self-tapping screws at the connection after a bending test could recover the modulus of elasticity by 56% in average, and could have regained the same bending strength as the control group.

並列關鍵字

Structural glulam ； Joint reinforcement ； Self-tapping screw ； Joint strength