College of Engineering, University of Babylon investigated the structural response of composite reinforced concrete slabs with a lintel section to a column of cold-formed iron with semi-rigid joints by the postgraduate student, Mr. Mustafa Salah Shaker.

The dissertation reviewed that the semi-rigid joints have many benefits, including reducing the depth of the beam and thus reducing its weight. It also has great absorption capacity and good performance when exposed to earthquakes.

The dissertation highlighted an experimental test of a joint of a beam to a semi-rigid column consisting of a composite reinforced concrete slab and two sections of cold-formed iron in the shape of (C) for the beam and the column.

The dissertation demonstrated that the tested samples with lintel-to-column joints connected at angles in the main compound joints group possess high ductile properties, as the turning capacity exceeded 30 milliradians, as all of these proposed samples are classified as semi-rigid joints according to European specifications and are suitable for flexible analysis and design seismic.