Abstract
Abstract The Brazilian construction industry still discusses the consequence of the Performance Standard on housing developments. According to ABNT NBR 15575 [1], the systems that compose residential buildings need to meet minimum performance requirements. Among the systems, the structural must reach a minimum Service Life (SL) of 50 years, or intermediate or higher that corresponds to 63 and 75 years, respectively. The industry also debates the impact and viability of increasing the SL of reinforced concrete structures. Therefore, this article aimed to analyze a single reinforced concrete building designed for the 3 SL specified by ABNT NBR 15575 [1]. The study focused on the total consumption of steel and concrete. The structure’s designed conditions of exposure were varied for each performance level, based on the 4 environmental exposure classes (EEC) of ABNT NBR 6118 [3] and ABNT NBR 12655 [11], totalizing 12 situations. It was noted that the increased performance level increases consumption of materials, and the designs made for EEC IV consumed 12.3% and 16.2% more steel and concrete at the intermediate and superior performance levels respectively, when compared to the minimum performance level.
Highlights
The Brazilian construction industry has shown notorious reactions to the implementation of ABNT NBR 15575 [1]
It was noted that the increased performance level increases consumption of materials, and the designs made for exposure classes (EEC) IV consumed 12.3% and 16.2% more steel and concrete at the intermediate and superior performance levels respectively, when compared to the minimum performance level
A slab with Service Life (SL) 75 years to EEC III loses about 15.8% of its usable height when compared to the minimum performance, influencing the increase of area of steel required
Summary
The Brazilian construction industry has shown notorious reactions to the implementation of ABNT NBR 15575 [1]. The standard defines minimum, intermediate and superior performance levels, with direct consequences to their stages of use Among these concepts is the SL, the minimum timespan that systems must remain meeting the performance of design. Foreign standards or technical studies with fundament must be consulted to reach intermediate and superior levels as they allow the adoption of consistent design criteria. Studies such as Bolina et al [7] and Bolina and Tutikian [8,9] serve as starting point for more sophisticated analyses that strive for SL values above the minimum that have not been defined by Brazilian standards yet. As presented by ABNT NBR 12655 [11] and, if the criteria set by ABNT NBR 6118 [3] have been met, the structures’
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