Abstract
Reinforced concrete codes worldwide establish that the design of slender columns must ensure that under the most unfavorable load combination, there is neither instability nor material failures. Thus, it is mandatory to consider material as well as geometrical nonlinearities. The consideration of second order effects can be done using simplified methods or the general method. This work analyses second order effects based on the approximate methods shown in NBR 6118 [1]: approximate curvature method and approximate stiffness procedure. Due to the importance of the columns in the stability of buildings is essential that these simplified design methods provide safe solutions for the design of columns. In this scenario, the objective of this study is to evaluate these simplified design procedures in terms of safety, precision and economy with respect to test results of RC slender columns subjected to eccentric loads found in the literature. The comparative analysis reveals that the approximate stiffness procedure provides better results.
Highlights
Reinforced concrete (RC) columns are linear structural elements, usually cast vertically, responsible for carrying the loads from floors to the foundations
The objective of this study is to evaluate these simplified design procedures in terms of safety, precision and economy with respect to test results of RC slender columns subjected to eccentric loads found in the literature
The goal of this paper is to analyze NBR 6118 [1] approximate design criteria for slender rectangular columns subjected to eccentric loads with respect to safety, precision and economy, by comparing code based calculations with respect to experimental results of columns built with conventional concrete
Summary
Reinforced concrete (RC) columns are linear structural elements, usually cast vertically, responsible for carrying the loads from floors to the foundations. Under the above conditions, must be designed to ensure that there is neither instability nor material failures Use of such an analysis to determine column compressive axial forces and bending moments for section design is the most rational approach. Due to the responsibility of columns in the stability and strength of concrete structures, these approximate approaches must provide adequate safety in the design In this scenario, the goal of this paper is to analyze NBR 6118 [1] approximate design criteria for slender rectangular columns subjected to eccentric loads with respect to safety, precision and economy, by comparing code based calculations with respect to experimental results of columns built with conventional concrete (fc ≤ 55 MPa). The investigation includes columns with concrete having compressive strength above 55 MPa since NBR 6118 procedures are being changed to allow the use of concrete with compressive strength above 55 MPa
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