Abstract
Abstract The objective of this paper is to present the formulation of the optimization problem and its application to the design of concrete-filled composite columns with and without reinforcement steel bars, according to recommendations from NBR 8800:2008, NBR 16239:2013 and EN 1994-1-1:2004. A comparative analysis between the aforementioned standards is performed for various geometries considering cost, efficiency and materials in order to verify which parameters influence the solution of the composite column that satisfies the proposed problems. The solution of the optimization problem is obtained by using the genetic algorithm method featured in MATLAB’s guide toolbox. For the examples analyzed, results show that concretes with compressive strength greater than 50MPa directly influence the solution of the problem regarding cost and resistance to normal forces.
Highlights
When filled with concrete and subjected to compression, tubular steel profiles are commonly referred to as composite filled columns
Results show that the use of concrete with compressive strength larger than 50 MPa is attractive for the cases analyzed
It is important to note that results might have been different if transportation costs were accounted for
Summary
When filled with concrete and subjected to compression, tubular steel profiles are commonly referred to as composite filled columns. In Brazil, procedures for the design of concrete-filled composite columns are currently prescribed by ABNT NBR 8800 [1] – Design of steel structures and steel-concrete composite structures. Particularities concerning the structural behavior of tubular steel profiles resulted in the publication of ABNT NBR 16239 [2] – Design of steel structures and.
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