Comparação técnica e econômica do uso de laje maciça em concreto armado e laje plana em concreto protendido em uma edificação multifamiliar

Abstract

The use of different approaches for the elaboration of a structural project of a building is a very individual process for each professional, since the concepts used, guided by the technique, come from a unique trajectory and at the same time cadenced by advances in the field of engineering. In this sense, the study aims to compare technically and economically the use of two different construction systems for the same transition slab of a multifamily building. The initially conceived project considered the execution of a massive slab in reinforced concrete, which was later replaced by a flat slab in prestressed concrete. Based on the SINAPI table for the cost of inputs, the quantities of materials described in the project were raised and a comparison was made under the economic bias between the two adopted solutions. Usually, the system based on the use of a flat slab in prestressed concrete proved to be less economically viable, due to the costs involving cables and concrete in volumes and cost due to the high Fck. Therefore, the reasons why it was decided to change the structural system of the transition slab of the building under study were not discovered, but it is understood that the fact that no changes were made to the project regarding the optimization of the reduction in the number of pillars directly impacted so that the cost of the adopted solution was higher than the cost of the first one, with a massive slab and conventional reinforced concrete