Análise paramétrica de lajes utilizando o software comercial TQS

Abstract

The use of unidirectional truss slabs and ribbed slabs with plastic molds is increasingly frequent in construction projects, justified by their low consumption of concrete and steel, as well as being lighter compared to solid slabs. This study aims to conduct a parametric analysis regarding the quantities of inputs required for three types of slabs – solid, unidirectional truss, and bidirectional ribbed – taking into account different span dimensions, with residential use overloads. For this work, the design was done using TQS® software to compare the input consumption for different spans and define which type of slab presents the best performance. The software generated quantities of steel, concrete, formwork, as well as other materials, such as EPS blocks and plastic molds. Additionally, using budget compositions from SINAPI, the costs per square meter for formwork and shoring for the three types of slabs were considered. Upon analyzing the results, the truss slab generally showed better performance, with lower concrete consumption, 46.23% lower than the solid and ribbed slabs. The steel consumption was lower than the solid slab in all analyzed spans, and in relation to the ribbed slab, the consumption was generally close. However, when analyzing the spans, the truss slab performed better in 10 out of 15 analyzed spans, along with the lowest cost per square meter for shoring and formwork. The ribbed slab had similar concrete performance to the solid slabs but had a significant advantage in steel consumption, being 47% lower. In comparison to the truss slab, it performed better in spans over 4 meters for steel consumption. The solid slab had the worst performance in material consumption. This study considered the software parameters, being appropriate with normative parameters.