Rasio Modulus Penampang Elastik Balok Kayu Laminasi-Baut

Abstract

. Laminated beam can be an alternative for solid timber, because it provides the advantage that it can be fabricated with a needed-span and a bigger cross section. The purpose of this research is to obtain an empirical equation of the bolt-laminated timber beam elastic section modulus ratio. Elastic section modulus ratio is elastic section modulus ratio between laminated and solid beams. Scope of this research are horizontally laminated system, Indonesian timber with specific grafity ranged 0.4-0.8 which are red meranti (shorea spp), keruing (dipterocarpus spp), and acacia mangium, prismatic beam section, experimental test in laboratorium and numerical simulation using nonlinear finite element method. The parameters discussed are timber type, bolt diameter, number of row, and spacing. Beam has a 3-meter span and arranged by 4 laminae. Timber stress-strain model for numerical simulation based on Hill plasticity, bolt stress-strain model is elasto-plastic. Results obtained are beam load-displacement curve trend is bilinear, the elastic section modulus ratio equation are the fuction of timber type, bolt diameter, and number of row against bolt spacing ratio. The elastic section modulus ratio can be used to predict the bending strength at the proportional limit