Abstract
Abstract The purpose of this work is the development and implementation of a numerical procedure for the design of reinforced concrete columns (RC) and composite columns with fully concrete encased steel I-section (SC). For this purpose, a computer program was developed to determine the load capacity of these columns, applying the General Method adopted by ABNT NBR 6118:2014. The program is based on an iterative process from integration of the curvatures along the column, obtained by determining the moment-curvature relationship of the cross section by the Newton-Raphson method. Several experimental and numerical results are compared to the program's to demonstrate the accuracy of the procedure.
Highlights
The purpose of this work is the development and implementation of a general procedure for the design of reinforced concrete columns (RC) and composite columns with fully concrete encased steel I-section (SC)
The main algorithms implemented in CSTMI are: algorithms for obtaining moment-curvature relationship; algorithms for obtaining the deformed cross section according to the applied axial force and moments; algorithms for obtaining axial force-moment interaction surface and interaction surface of moments for a given axial force; and algorithms for obtaining 3D surface interaction to axial force and moments
To validate the procedure for calculation of reinforced concrete columns implemented via CSTMI, the authors have modeled columns subjected to combined compression and uniaxial bending studied by Araújo [6], who compared theoretical results obtained from a computer program implemented by him to results of several experiments by other researchers
Summary
The purpose of this work is the development and implementation of a general procedure for the design of reinforced concrete columns (RC) and composite columns with fully concrete encased steel I-section (SC). A calculation model in accordance with the ABNT NBR 6118:2014 [1] General Method was implemented in order to evaluate the bearing capacity of reinforced concrete columns and composite columns according to the same parameters comparisons. The program is based on an iterative process from integration of the curvatures along the column, obtained by determining the moment-curvature relationship of the cross section by the NewtonRaphson method, based on a discrete fiber model. Several experimental and numerical results are compared to the program’s to verify the efficiency of the procedure
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