The focus is on recent developments which may be classified as follows:
- Adaptation of the general theoretical achievements to specific types of structures and, at the micro-scale, to heterogeneous materials;
- Generalisation of the basic theory to dynamics, i.e. to the time-dependence due to inertia and damping forces;
- Reformulation of the fundamental theorems in the broader frame of geometrically non-linear theory of solids and structures;
- Allowing for more sophisticated models of inelastic material behaviour, including non-linear hardening and softening, non-associated flow rules, viscous effects, multi-phase poro-plasticity, and material damage;
- Development of computational procedures and specific ad-hoc algorithms by which direct methods can be efficiently used to solve large-scale industrial problems.