The realistic response of the steel frames cannot always be investigated with idealized rigid or articulated joints. For sideways loads, significant calculation errors may occur if the modeling of the joints does not take into account their most realistic behaviour. The use of semi-rigid joints, both in design and construction, can result in favourable structural properties in the case of steel frames, especially in seismic areas.
Earthquake zones cover a significant part of our earth, therefore, when planning and designing residential areas, factories, or other human establishments, professionals have to take into account the seismic hazard of that area. The current earthquake standard in Romania is based on the European code. This paper presents, beside the most significant structural composition rules, the applicable methods that can be used to ensure sufficient load bearing requirements.