Technical and Economic Analysis of Structures of Buildings in Reinforced Concrete with Ribbed Slab from 3 to 21 Floors

摘要

The aim of this study is the technical-economic analysis of buildings from 3 to 21 storey, applying different characteristic resistance values at 28 days (f_(ck)), varying between 25 and 40MPa, with a geometric relation, in plant, of 1:1. By means of the obtained results, it is estimated that it is possible to assist the structural design, the sizing and, mainly, to subsidize the budgeting of the structure of buildings in reinforced concrete with the same geometric relation. The results and data organization were obtained through structural analysis software and electronic spreadsheets. The applied research methods were subdivided into architectural design, structural design, stability analysis, cost composition and technical-financial analysis. With the results, it can be concluded that: (i) the increase in f_(ck) value significantly altered the steel consumption of the pillars, presenting different behaviors according to the height of the building; (II) the average thickness of the pavements type and the consumption of mold presented a slight reduction with the increase of the value of f_(ck); (III) the use of C-35 concrete results in lower overall costs for buildings up to 15 floors and C-40 concrete for buildings of 18 and 21 floors.