Comparativo entre os quantitativos e custos de materiais dos sistemas estruturais em um estudo de caso

Abstract

The need for increasingly complex and slender structures that offer savings and meet current architectural parameters has driven the development of more sophisticated tools in the field of structural calculation, which have allowed the integration of parameters that are increasingly closer to reality. Therefore, it was proposed to verify the best cost-effectiveness for an architectural project through the use of conventional solid slab, ribbed slab molded in place and prefabricated ribbed slab with precast ribs and expanded polypropylene filling. In the first place, a study was carried out on Reinforced Concrete, the material used in the three models, and then the necessary definitions for the structural project were exposed, which involved the class of environmental aggressiveness, the action of the wind, the safety definitions defined by NBR 6118 /2014 and the requirements presented in building performance standart (nbr 15,755/2013) and fire resistance standart (NBR 15.200/2012 and NBR 14.432/2001). Then, the characteristics, advantages and disadvantages of each system were pointed out, as well as the design parameters necessary for launching and sizing them. From this, the methodology was developed, describing each step performed in the TQS software, chosen for structural design. After obtaining the quantities of reinforcement, formwork and concrete in TQS for each model, the cost estimate was performed using the SINAPI price reference table. At last, it was observed that the most expensive model was that of prefabricated ribbed slab with precast ribs, while the second was that of conventional slabs and, at last, that of ribbed slabs casted in place.