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NUMERICAL AND EXPERIMENTAL STUDY OF THE MAIN PARAMETERS OF RESISTANCE AND STIFFNESS OF CROSS LAMINATED TIMBER ELEMENTS

Grant number: 20/00555-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2020
Effective date (End): February 28, 2023
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Julio Cesar Molina
Grantee:João Vítor Felippe Silva
Home Institution: Universidade Estadual Paulista (UNESP). Campus Experimental de Itapeva. Itapeva , SP, Brazil

Abstract

Cross Laminated Timber (CLT) is a wood-based composite with properties that allow it to be used in structures such as walls, floors and ceilings. The panel is composed of wood lamellae arranged in orthogonally layers. The main parameters used in the calculation of the CLT panel consider the reduction of the cross section inertia as a function of the Rolling Shear (R.S.) effect, which is the relative rolling between two parallel lamellae of the panel. This effect is quantified by the resistance (fv9090) and stiffness (G9090) modules. In Brazil there is still no specific standard for the determination of these parameters and the desirable pressure values used in the production of the panels. Therefore, this research project aims the numerical and experimental study of CLT elements focusing on its resistance and stiffness of the RS effect. The first stage of the study will be to evaluate the bonding quality of reforestation woods (pine, eucalyptus, Indian cedar and Australian cedar) at different pressure levels. In the second stage, the CLT elements will be manufactured for each combination at the previously defined pressure, and the strength (fv9090) and stiffness (G9090) parameters will be determined. For this purpose, proposed specimens will be used to evaluate this effect on flexion and direct shear, according to Draft Standard PN-02: 126.10-001-6 (2013). Complementary analyzes will be performed based on the Finite Element Method (FEM). Thus, it is intended to provide subsidies for the project to revise the Brazilian standard of wood structures NBR 7190 (1997).

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