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Title: Bending properties of Mengkulang Glued laminated (glulam) timber and laminated veneer lumber (LVL)
Author(s): Ismail, S., Muhammad N.A, Ahmad, Z
Pages: 1-16 Paper ID:200102-5454-IJBAS-IJENS Published: April, 2020
Abstract: This paper presents the investigation of mechanical properties of glued-laminated timber (glulam) and laminated veneer lumber (LVL) manufactured from a tropical medium hardwood, Mengkulang (Heritiera s.p). The properties included the bending stiffness; local and global modulus of elasticity (MOE local, Em,l and MOE global, Em,g) and the strength (bending strength parallel to grain, fm). Three samples comprising 7 glulam beams, 7 nos. of LVL flatwise beams (for bending flatwise) and 6 nos. LVL edgewise beams (for bending edgewise), were subjected to four-point loading procedures according to Eurocode standards. Results specified Mengkulang glulam had the highest strength and stiffness among the others. The MOE global was higher than MOE local as discovered in the glulam sample, mainly due to the presence of the weak zone at the low bending stiffness. The LVL edgewise sample was proved to have greater values of stiffness and strength than that of the LVL flatwise. The LVL edgewise fracture beam could be observed as grain deviation at the tension zone whereas LVL flatwise exhibited horizontal shear failure. The glulam sample passed the requirement of delamination percentage and the shear strength according to MS 758. The results from experimental also showed that the bending strength and stiffness of glulam and LVL, manufactured from medium hardwood of Mengkulang species (strength group S.G.5) could be improved to the equivalent strength of heavy hardwood.
Keywords: ETP, glulam, LVL, Mechanical properties, Mengkulang
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