Elastic Cross-Section Modulus Ratio of Jabon (Anthocephalus cadamba Miq.) Bolt-Laminated Timber Beams. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Pranata, Y A; Kristianto, A; Darmawan, A
• Is Part Of: IOP conference series. Volume 1071:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/1071/1/012016
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: The strength and stiffness of the beams are related to the elastic cross-section modulus of the beam, which are related to the cross-section moment of inertia. The elastic cross-section modulus of mechanically laminated (bolt-laminated) timber beams are not the same as solid timber beam for the beam with the same cross-section, this can be happened due to the inertia moment of cross-section of the bolt-laminated beam is lower than the solid beam due to slip between laminae and the elastic modulus of every lamina are varying. The aim of this research was to study the elastic cross-section modulus of mechanically laminated timber using bolts as a shear connectors. The scope of the study are the beam specimens made from Jabon timber (Anthocephalus cadamba Miq.) 60 mm x 160 mm cross-section size, three beam specimens with 1500 mm clear-span length, four lamina layers, lamination system using bolt as a shear connectors to reduce slip between laminae, flexural testing using the four-point loading test method according to the ASTM D198, the flexural behavior reviewed in this research are the flexural strength, the elastic cross-section modulus ratio, and the displacement ductility ratio. The bending strength of bolt-laminated timber beams obtained from an experimental test is 12.11 MPa (average) in the term of proportional limit load, while the bending strength of a solid timber beam is 37.96 MPa. The results showed that the elastic cross-section modulus and the flexural stress of the bolt-laminated timber beams were lower with a ratio of 0.32 than the solid timber beam, and the ductility ratio of the bolt-laminated timber beams was 1.18 so that they were categorized in the limited ductility criteria. The test results indicate that the failure of bolt-laminated Jabon timber beams are a failure of bending. The elastic modulus cross-section parameters of laminated timber beams are useful for the design of beam structure components in buildings, especially in the calculation of beam strength and beam stiffness as a serviceability requirement.