Abstract
A new beech and self-tapping screw composite dowel is proposed and studied, its performance being compared with that of beech dowels and self-tapping screws alone. The single shear performance of components connected by composite dowels was tested. Results show that the dowels are a good choice for components requiring high stiffness. Screws remain a good choice for components requiring excellent seismic performance. Combination group presents similar maximum load stiffness to those of composite dowels, but other ductility parameters are superior for composite dowels. The best connection mode was provided by two composite dowels. Based on connecting two points, structural elements with two composite dowels showed much better load bearing ability than when joined by two beech dowels or by two self-tapping screws separately. The structural element with two composite dowels not only presented better initial stiffness, but also exhibited a better ductility coefficient and less energy consumption. So, the composite dowels can be used for beam column connection, dowel laminated timber, and restoration or enhancement of ancient buildings.
Highlights
With the development of wood-based engineering materials, especially laminated timber and crosslaminated timber (CLT), self-tapping screws (STSs) have been studied [1]
We study the single shear performance of components connected by composite dowels
Screws can be selected for components requiring excellent seismic performance
Summary
With the development of wood-based engineering materials, especially laminated timber and crosslaminated timber (CLT), self-tapping screws (STSs) have been studied [1]. Traditional wood dowels are continuously used as a green and low-carbon alternative for connecting CLT [2,3,4]. Teng found for the basic connection properties of STSs that as the angle decreased their withdrawal strength at first decreased and increased. When pulling out the STSs driven in an end face, the damage was obvious brittle fracture [9]. A generic model approach was proposed by Brandner et al [10,11] to calculate the withdrawal strength of axially-loaded STSs inserted in structural timber or glued to laminated timber products made of either coniferous or deciduous timber
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