Abstract
Abstract To analyze the reliability of slender columns subjected to axial force and uniaxial bending moment, with a slenderness index between 100 and 140, 216 columns were modeled. The square cross-section was adopted, with three different configurations for longitudinal reinforcement. In the calculation, the general method with the linear creep theory was applied. Several factors were varied: slenderness index, reinforcement ratio, steel bars arrangement, compressive strength of concrete, and first-order relative eccentricity. For analysis purposes, the Monte Carlo method was adopted, followed by the First Order Reliability Method (FORM). Considering the results obtained, it was observed that the reliability index is usually higher for lower reinforcement ratios and varies according to the configuration of the cross-section.
Highlights
To evaluate the reliability of slender reinforced concrete columns, designed according to the Brazilian Standard NBR 6118 [1], a numerical analysis was conducted with 216 columns, and these columns were modeled to failure exclusively for this research
It is possible to evaluate the variation in the slenderness index and the compressive strength of concrete, among other parameters
There is a reduction in reliability as the reinforcement ratio increases
Summary
To evaluate the reliability of slender reinforced concrete columns, designed according to the Brazilian Standard NBR 6118 [1], a numerical analysis was conducted with 216 columns, and these columns were modeled to failure exclusively for this research. The following variations were considered: slenderness index, compressive strength of concrete, first-order relative eccentricity, reinforcement ratio, and arrangement of steel bars in the cross-section. The study was limited to columns of square cross-section, constant along with the height, with slenderness index between 100 and 140. Cantilever columns with compressive load and moment due to the force eccentricity were.
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