A Predictive Nonlinear 2D Mechanical Model for FEM Analysis of Trait de Jupiter Wooden Joints

This chapter aims to evaluate the nonlinear mechanical behaviour of the trait de jupiter for supporting through computational analysis of the use of traditional techniques to be employed in restoration interventions. This joint represents a favourite solution within traditional construction techniques due to its ability to have both compressive and tensile high strength. However, technical specifications still rely on oversimplified mechanical models, which do not account for the inherent nonlinear nature of traditional connections like the trait de jupiter, which can noticeably affect the structural response. The present work contributes to this direction by proposing a 2D nonlinear model for the contact interface of the joint. Modern case studies have been selected which preserve material evidence of construction solutions in full continuity with others discovered in archaeological contexts. Survey campaigns of the structures are then pursued on several wooden roof structures of the Roman monumental architectural heritage. As key, a nonlinear predictive mechanical model is developed and numerically analysed using the finite element method (FEM). This determines the stiffness and bearing capacity of the beam element in the function of the level of constraint offered by the joint.