Aanálise comparativa entre laje treliçada e laje mista steel deck aplicadas à laje do pavimento superior de um sobrado comercial com aplicação de matriz de decisão multicritério

Abstract

This study presents a comparative analysis between a precast lattice slab with EPS infill and a Steel deck composite slab, applied to a 244 m² commercial mezzanine. The objective was to evaluate the structural, executive, and economic performance of both solutions. The methodology included structural design according to ABNT NBR 6118:2023 and NBR 8800:2024, budgeting based on the SINAPI database (Goiás), and the application of a multicriteria decision matrix based on Expert Judgment. Results showed that both systems met the structural requirements for the 2.48 m main span and 3.0 kN/m² commercial live load. However, the lattice slab presented a direct cost of R$ 125.11/m², proving to be more economically viable than the Steel deck, which cost R$ 205.80/m² (a 64.5% increase). In the decision matrix, the lattice slab achieved the highest global score (3.80 versus 3.50 for the Steel deck), driven by the weight of the financial factor. It is concluded that for this scenario of short spans and no critical schedule constraints, the lattice slab is the most cost-effective solution.