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INNOVATIVE JOINT SYSTEM FOR SMALL FRAME STRUCTURAL CONNECTIONS
Abstract
The aim of this investigation was to design and determinate the mechanical properties of innovative, externally invisable joints that can be assembled without the use of tools. The purpose of the paper is to determine the strength, stiffness and modulus of the elasticity of T-type mortise, loose tenon +/ glass fibre reinforced plastic clamping furniture and framing joints under tension, bending and share loads LVS EN 310:2001 [1]and Eurocode 5 [2] for wooden indoor and outdoor structural connections. Thesamples are made from European spruce (Picea abies Karst.) C 24 class timber LVS EN14081-2+A1:2016, [3] with relative wood moisture 18%. These samples are assembledwith water/ high temperature resistant polyurethane adhesive [4] Kleiberit PUR LVS EN301:2018 [4]. The European birch (Fagus sylvatica) is used for loose tenon for indoorjoints and the Sipo Mahogany (Entandrophragma utile) is used for outdoor joints [LVS EN 942:2007 [5]. Before gluing and practical tension, bending loads testing themoisture measurement is performed. The total number of samples are 35. The samplewidth and thickness is 95mm and 45mm. T-type loose tenon +/ glass fibre reinforcedplastic clamping furniture joints under tension are 10% stronger than T-type mortise andframing joints but in bending tests were the same results as others joints. The accuracyof the developed strength, stiffness, deformability and elasticity modulus models of theexamined joints was verified positively both by experimental studies and numericalcalculations.
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References11
LVS EN 310:2001 Determination of modulus of elasticity in bending and of bending strength
Eurocode 5 Design of timber structures
LVS EN 14081-2+A1:2016 Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements
LVS EN 301:2018 Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
LVS EN 942:2007 Timber in joinery - General requirements
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Swedish Wood spreads knowledge, provides inspiration and encourages development relating to wood, wood products and wooden construction. Swedish Wood is a department within The Swedish Forest Industries Federation. Swedish Wood is supported by the Swedish sawmill and glulam industries.
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