A New Model to Predict the Load-Slip Relationship of Bolted Connections in Timber

Christian P. Heine, J. Daniel Dolan


The development of a new approach to predicting the load-displacement interaction of bolted wood connections is described.

The European Yield Theory for bolted wood connections has gained wide acceptance in recent years attributed to its closed form, simplicity, and accuracy. But the model does not relate capacity or any other loading state to joint slip. A method to determine deflection related properties of bolted joints in timber with a single equation would be an important contribution to the field of timber engineering. The model would simplify the analysis of large structures including schools, gymnasiums, bridges, and light-industrial buildings where wood could be utilized because of its economy, high-strength-to-weight and stiffness-to-weight ratios.

Based on yield characteristics predicted by the European Yield Theory, the joint was abstracted where the dowel rotates about the plastic hinge under a warped force-deformation plane. Through subsequent simple integration along the dowel length, a closed form solution could be developed. The analysis of a two-member connection assembled with a single bolt indicated that the model closely predicts the load-displacement relationship.


Bolted connections;model;load-slip;timber

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