Prediction of withdrawal stiffness of self-tapping screws
conference paper
: Self-tapping screw is a new generation of fasteners which is often inserted into the face of timber members
at an angle to develop stiff and strong connections. The withdrawal stiffness of self-tapping screws is an important
property that influences the performance of the connection. The designs of composite timber hybrids incorporating
inclined self-tapping screws, such as timber-concrete and timber-steel, can be governed by the stiffness of their
connections, which is in turn influenced by the fastener withdrawal stiffness. This study proposes empirical equations for
directly predicting the withdrawal stiffness of the self-tapping screws, based on wood density, fastener diameter, insertion
angle and penetration length. These empirical equations were developed based on an analysis of withdrawal test data from
several test programs, covering two wood species and two screw diameters. They could be used in conjunction with
appropriate models to predict the stiffness of connection containing self-tapping screws inserted at an angle to the wood
member surface
at an angle to develop stiff and strong connections. The withdrawal stiffness of self-tapping screws is an important
property that influences the performance of the connection. The designs of composite timber hybrids incorporating
inclined self-tapping screws, such as timber-concrete and timber-steel, can be governed by the stiffness of their
connections, which is in turn influenced by the fastener withdrawal stiffness. This study proposes empirical equations for
directly predicting the withdrawal stiffness of the self-tapping screws, based on wood density, fastener diameter, insertion
angle and penetration length. These empirical equations were developed based on an analysis of withdrawal test data from
several test programs, covering two wood species and two screw diameters. They could be used in conjunction with
appropriate models to predict the stiffness of connection containing self-tapping screws inserted at an angle to the wood
member surface
TNO Identifier
987589
Source title
World Conference on Timber Engineering, Oslo, 2023
Pages
1-6
Files
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