Abstract
This paper aims to describe the performance of mix-glue laminated timber beams that are given a nylon strapping as external reinforcement with the three-point bending test to three groups of beams based on the span-to-depth ratio, i.e.: G11, G8, and G5 groups. Each group consists of three types of lamination compositions, namely: Type I, whole lamination consists of sengon wood; Type II, the placement of the coconut wood lamination as the outermost; Type III, similar to type II with added nylon straps with a distance of 5 mm. The bending test results show differences in elastic modulus, flexural strength and shear strength of the glue-laminated timber beams. Based on the comparison of glulam beams consisting of six laminations of sengon wood it was found that the placement of the coconut wood as the outermost lamination succeeded in increasing the elastic modulus, the flexural and shear strength of beams by 28%, 13%, and 34%, respectively. In addition, the reinforcement with nylon straps results in the modulus of elasticity, bending and shear strength of glulam to increase by by 41%, 2%, and 49% respectively.
Highlights
Sengon wood (Albizia falcatara) is a low-grade timber with a density of only 0.29-0.314 gr /cm3 at 12–15% moisture content [5]
The application of glass fiber-reinforced polymer (GFRP) on the side of the timber beams along the shear span has resulted in an increase in shear strength by 40% [7]
This study aims to describe the performance of glulam mixed beams consisting of coconut wood on outermost laminations and sengon wood on core laminations
Summary
Sengon wood (Albizia falcatara) is a low-grade timber with a density of only 0.29-0.314 gr /cm at 12–15% moisture content [5]. The utilization of these two types of wood for structural components of buildings, especially in Indonesia, is still minimal This is because of the low mechanical characteristics of sengon wood and the varying grades of coconut wood density. This study aims to describe the performance of glulam mixed beams consisting of coconut wood on outermost laminations and sengon wood on core laminations This will explain the effect of nylon-strapped applications as external reinforcement on beam performance. The development of this mix-glulam system is expected to expand the scope of utilization of sengon wood and coconut wood while reducing the dependence of the timber supply from forests. Every type consisted of three beams, so the total glulam beams were 27
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