Proceedings of the 4 th World Congress on Civil, Structural, and Environmental Engineering (CSEE’19) Rome, Italy – April, 2019 Paper No. ICSECT 142 DOI: 10.11159/icsect19.142 ICSECT 142-1 A Novel Steel-Concrete Composite Flooring System: Development and Preliminary Experimental Investigation Danilo Di Giacinto 1 , Daniele Losanno 2 , Eugenio Ruocco 1 , Luigi Grassia 1 1 School of Polytechnics and of the Basic Sciences, University of Campania Luigi Vanvitelli Via Roma 9, 81031 Aversa, Italy danilo.digiacinto@unicampania.it; eugenio.ruocco@unicampania.it; luigi.grassia@unicampania.it 2 Department of Structures for Engineering and Architecture, University of Naples Federico II Via Claudio 21, 80125, Naples, Italy daniele.losanno@unina.it Abstract - A new steel-concrete composite system is herein proposed to achieve a stronger, more ductile, and more economical flooring solution. The system consists of a smooth cold-formed steel profile fully embedded into a concrete pouring; Expanded Polystyrene (EPS) or hollow blocks are interposed between the steel profiles in order to lighten the slab weight. The system relies on particular shape and web holes only to achieve vertical interlocking and bonding resistance between concrete and cold-formed profile. The profile’s shape has been properly designed through a multi-objective optimization process considering flexural performance, self- supporting capacity, manufacturability, ease of installation, and compatibility with existing technologies. An experimental testing campaign on full-scale specimens has been carried out to investigate the flexural capacity of the system up to failure. Keywords: Cold-Formed Steel; Steel-Concrete Composite Flooring; Composite Structures Plastic Limit Analysis; Experimental Investigation. 1. Introduction Within the construction industry, the usage of concrete-steel composite slabs and beams is steadily increasing due to the speed of construction and a general cost reduction that can be achieved. Current construction methods in Italy are based on a Prestressed Concrete T-beams (concrete joists) System (PCS) with hollow bricks or ESP blocks to provide a simple and economical suspended flooring system for most types of housing and low-rise buildings. (See Fig. 1). Joists are usually made with high strength concrete (e.g. 40MPa compressive strength) prestressed by means of twisted wires having a minimum tensile strength of 1670MPa. Fig. 1: Lightened ribbed concrete slab with precast joists. Typical cross-sectional dimensions are 9cm (height) and 12cm (width) while relative spacing varies from 50cm to 62cm.