As seen on Fig.3, cold formed steel were used for columns and beams (i.e., boxsections). Columns, 200 mm high x 100 mm width were constructed using two U shapes (200 x 50 x 30 x 5,0), fillet welded all around the sections. All the beams had the same external dimensions, and were constructed with two U shapes (200 x 50 x 15xt, welded the same way. The structural elements didn't use any traditional fire protection, but they can be considered partially protected by a 100 mm masonry (concrete blocks plus a mortar-based cover), according Fig. 4. A concrete/ceramic composite slab was used, with 70 mm thickness + 50 mm top cover + 20 mm undercover, resulting in a 140 mm composite deck.

a) Cross section 

 b) Typical connections

Fig 3 - Beams and columns 

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