Connections
The behaviour of a structural system is very much dependent on how its members are connected to each other. The properties of connections are a long-standing problem under investigation and have been scrutinised by many researchers to the point that is difficult to have one solution that fits to all problems.
Structural engineers are devising designs for specific loading regimes and have to ignore other complex forces that may be applied to the entire structure during construction, operation and dismantling phases in order to come up with reasonable solutions that save as much material as possible without being too complex to fabricate, install and dismantle.
Moreover, modular building systems pose another difficulty which is related to the nature of the modules (volumetric or panelised), the building height, the type of installation, the tooling used, and others.
