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Novel composite connection for timber-glass composite structures

Unuk Žiga, Štrukelj Andrej, Žegarac Leskovar Vesna, Premrov Miroslav

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 1

294--309

This study presents a newly developed timber-glass point connection intended to strengthen existing timber elements in a reversible and visually unobtrusive manner. The new connection consists of an aluminium insertion, two-component struc-tural bonding epoxy resin adhesive, and self-tapping screws. The connection offers the possibility of easy attachment and detachment of the glass element from the strengthened timber element. Seven timber-glass specimens were constructed to perform an experimental investigation of the shear load-bearing capacity and load-slip behaviour of the connection. The aluminium insertion is bonded to a tempered glass strip with a hole and is screwed to the spruce timber block. The timber-glass connection preparation process is thoroughly presented. A special testing apparatus was developed to perform the experiments on a hydraulic universal testing machine. The experimental results are evaluated using analytical expressions and a finite-element simulation. The average connection load-bearing capacity obtained from the experiments of the analysed specimen was 13.31 kN, and the average slip modulus was 20.48 kN/mm. All connections failed on account of self-tapping screw failure, whereas the tempered glass strips remained undamaged.