Paper number 854
|COST VERSUS RELIABILITY IN REINFORCED HSC COLUMN DESIGN|
Sofia M. C. Diniz1
1Department of Structural Engineering, Federal University of Minas Gerais, Av. do Contorno 842, 20 Andar, Belo Horizonte, MG 30110-060 Brazil
|Summary||High-strength concrete (HSC) can largely extend the advantages of reinforced concrete (RC) technology. In fact, HSC has found an increasing utilization, especially in the lower columns of high-rise buildings. From a deterministic viewpoint, it has been shown that the most economical column corresponds to the use of a minimum amount of longitudinal steel and the highest available concrete compressive strength. However, the most economical solution does not necessarily represent a reliable one. In this study, a decision analysis process for the case of axially loaded RC columns is presented. The weighted objective approach is employed; two main objectives are pursued: minimize costs and maximize column reliability. Probabilistic methods are used to define column reliability with respect to ultimate strength. Several combinations of concrete compressive strengths and longitudinal steel ratios are taken as the possible alternatives.
||Keywords|| reinforced concrete, high-strength concrete, columns, random variables, probabilistic methods, reliability, cost, decision process.
Theme : Reinforcement and repair in Civil Engineering and Building Construction
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