Evaluation of the Structural Performance of Portal Frames Using Japanese Cedar Glulam

柳杉集成材門型剛架之結構性能評估

葉民權(Min-Chyuan Yeh) ； 林玉麗(Yu-Li Lin) ； 鄧書宇(Shu-Yu Deng)

《台灣林業科學》 30卷1期 (2015/03) Pp. 31-44

https://doi.org/10.7075/TJFS.201503_30(1).0003

摘要

本研究利用37～39年生柳杉造林木製造對稱異等級結構用集成材，並以尺寸為140×304.8×2200mm之集成材為柱，以140×304.8×3000 mm之集成材為梁組成實大尺寸之門型剛架，用以評估其結構系統對側向力之抵抗性能。在梁柱接合處分別以L及I型金屬連結件設計並以8支插銷扣件採取不同配置進行組合，所組成之門型剛架以7階段反覆載重及單向載重進行側向載重試驗。結果顯示，在I型連結件組合條件下，插銷扣件以方型排列配置之集成材門型剛架的最大水平破壞強度較以圓型配置條件高出12.7%。在結構剛性及能量散逸方面，以L及I型連結件者在插銷扣件方型排列配置條件下較圓型配置條件均能高出20.6～36.4%。所推導之柳杉集成材門型剛架基準剪斷強度為9.6～13.7 kN，其關鍵載重為該剛架系統之P1／120，約為平均最大破壞載重之19.8%。所得之剪力牆乘數約為2.33～3.35，其中又以L型連結件且扣件以方型配置之門型剛架之結構性能為優。

關鍵字

柳杉 ； 門型剛架 ； 結構用集成材 ； 側向抵抗性能

並列摘要

In this study, a symmetrical mixed-grade composition glulam was fabricated using 37~39- yr-old Japanese cedar plantation timber. A full-size portal frame was then constructed with two 140×304.8×2200-mm posts and a 140×304.8×3000-mm beam to investigate the resisting performance of the frame system to lateral forces. Each joint between the glulam beam and post members was assembled with a design L- or I-type metal connector with 2 placement types using 8 pin fasteners. The glulam portal frame was subjected to a rack test with 7 stages of a lateral cyclic loading protocol and a monotonic loading application. Results indicated that a 12.7% increase in the maximum lateral load capacity was found for the glulam portal frame using a straight metal connector with pin fasteners arranged in a square compared to fasteners arranged in a circle. Also, the portal frames assembled with fasteners in the square placement for both the L- and I-type connectors showed 20.6~36.4% higher initial stiffness and dissipated energy values than those in the circular arrangement. The reference shear strengths of the Japanese cedar glulam portal frames were 9.6~13.7 kN, which were derived from critical P1/120 values among all connector and fastener placement conditions. These reference shear strengths of glulam portal frames were 19.8%, on average, of the maximum lateral load capacity. Resultant multiplier parameters of the shear wall were 2.33~3.35, and better structural performance was found for portal frames assembled with the L-type connector and pins arranged in a square.

並列關鍵字

Japanese cedar ； portal frame ； structural glulam ； lateral resisting performance