Mechanical Behaviour of Aluminium-Timber Composite Connections with Screws and Toothed Plates.

Marcin Chybiński,Łukasz Polus

doi:10.3390/ma15010068

Abstract

This paper presents an investigation of the load-slip behaviour of aluminium-timber composite connections. Toothed plates with bolts are often used for connecting timber structural members with steel structural members. In this paper, toothed plates (C2-50/M10G, C2-50/M12G or C11-50/M12) have been used as reinforcement in aluminium-timber screwed connections for the first time. The push-out test specimens consisted of laminated veneer lumber slabs, aluminium alloy beams, and hexagon head wood screws (10 mm × 80 mm and 12 mm × 80 mm). Of the specimens, 12 additionally had toothed plates as reinforcement, while 8 had no reinforcement. The load carrying-capacity, the mode of failure and the load-slip response of the strengthened and non-strengthened screwed connections were investigated. The use of toothed plate connectors was found to be effective in increasing the strength of aluminium-timber composite connections and ineffective in improving their stiffness. The examined stiffness and strength of the connections can be used in the design and numerical modelling of aluminium-timber composite beams with reinforced screwed connections.

Highlights

Great importance is attached to civil engineering solutions being sustainable.The use of timber and engineered wood products in the construction industry reduces the carbon footprint
The authors of this paper proposed to use a toothed plate in the screwed connection
The authors of this paper suggested Equation (3) be modified by adding a coefficient of 1.24, taking into account the lowest value of the enhancements obtained from the tests, to characterise the load-carrying capacity of the aluminium-timber screwed connection reinforced with toothed-plate connectors: Pult = 1.24(5.95d − 27.2)/2 (4)

Summary

Introduction

Great importance is attached to civil engineering solutions being sustainable.The use of timber and engineered wood products in the construction industry reduces the carbon footprint. Recent scientific studies on timber structures can be divided into four groups: material tests (e.g., [3,4]), connections for timber elements (e.g., [5,6]), strengthening of timber elements (e.g., [7,8,9]), and composite structures with timber structural members

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