Full-interaction design of composite ribbed lattice girder slabs with cold-formed lipped channel shuttering

Resumo

The development of design methods for steel-concrete composite slabs grew in importance due to an
ever-increasing demand for architectural flexibility, which allows for the reduction of total construction cost and
simplifies construction procedures. An alternative to traditional pre-cast lattice joist slabs was recently developed,
which implements a cold formed steel (CFS) profile fastened to trussed rebar by uniformly distributed plastic
spacers. Previous theoretical studies resulted in methods for predicting the ultimate allowable live load of this slab
system. However, steel-concrete composite behavior was neglected due to the absence of experimental data. As
such, this paper relies on standardized design codes to propose a design method that accounts for composite
behavior, considering full interaction between CFS profile and reinforced concrete (RC). Altogether, the results
obtained have evidenced a better performance of the system regarding the previous design methods, expressed by
the increase of unpropped span in more than 80%.