The Open Web
Joist (OWJ) system supports floor and roof in simple span conditions
slab designed to be reinforced in one way slab method work independently
from the supports.
composite floor joist system (HAMBRO)
system consists of hybrid concrete/steel T-beams running in one
direction, the top cord is embedded in the concrete and functions as a
continuous shear connector.
systems are widespread in North America, mostly in the United States and
Canada, for roof constructions of commercial and industrial buildings