A generalised mechanical model for the characterisation of steel joints

Component-based mechanical models compliant with Eurocode 3 becomes a popular alternative to complex Finite Element (FE) analyses for characterising the behaviour of steel joints. However, several key aspects are not accommodated by the existing spring models, i.e., group mechanisms, component interactions, and the variation of the shear force on the height of the column web panel. This paper introduces an innovative mechanical model suitable for the characterisation of structural joints under generalised loading. The model relies on the principles of the Component Method and incorporates the features systematically disregarded in the classical spring models. This guarantees code-compliant predictions, and by virtue of its universality, the model can be used for any loading protocol (bending moment - sagging or hogging, axial force, bending moment + axial force). Conclusive evidence given by comparisons with experimental data and analytical results shows the compliance of the proposed model with the Eurocode 3 and proves its accuracy in predicting the actual behaviour of steel joints. The proposed modelling method-ology allows integrating the model as a macro-element in dedicated software, thus presenting promising perspectives for reliable and time efficient structural analyses.