PERILAKU KEGAGALAN GESER PADA BALOK LAMINASI JABON-BAMBU

Abstract

The development of engineering timber technology such as laminated veneer lumber, cross-laminated timber, and others proposes to satisfy the timber demand deficit in terms of both strength and material dimensions. In addition to being green and sustainable, timber has a higher mass strength ratio than concrete or steel materials. Jabon (Anthocephalus cadamba Miq.) is fast-growing species of timber produced by community plantations commonly used for furniture. Jabon timber including classified as strength timber IV causes this type of timber is not used as a structural element. To increase the strength of Jabon wood, researchers assembled the timber with Petung bamboo  (Dendrocalamus asper) which mechanically has a better toughness. This is what underlies the researchers made an innovation to make the timber laminated beam of bamboo-Jabon. The purpose of this research was to determine the mechanical behavior of bamboo-Jabon lamination due to shear failure. The method used in this study is experimental. The dimensions of the beam in this research are 60 x 120 mm with a length of 900 mm, a static bending test is performed. There are three variations in this research, namely variations in the thickness of timber slabs 10 mm, 15 mm, 20 mm, and bamboo thickness of 5 mm. The results of this research show that the shear stress of the laminated beam experimental results of jabon-bamboo is 1.9 times, 1.67 times, 1.71 times greater compared to the analysis of sequential appearance transformations for the thickness variation of 10 mm, 15 mm, and 20 mm. When compared with the analysis using SNI 7973:2013, the jabon-bamboo laminate beam has a greater shear stress value of 1.89 times, 1.45 times, and 1.31 times respectively for variations in the thickness of the blade of jabon timber 10 mm, 15 mm, and 20 mm.