Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

The Introduction of a Simple and Effective Method for Analysis of Column Bases under the Effect of Axial Force and Biaxial Bending Moment with the LRFD Design Approach

Document Type : Original Article

Authors
Abazar Asghari 1
Ali Zainali 2
1 Aَssociate Professor, School of Civil Engineering, University of Tehran, Tehran, Iran
2 Master of Science, Faculty of Civil Engineering, Urmia University of Technology, Urmia, Iran
10.22065/jsce.2024.452060.3394
Abstract
Considering that in the practical applications many column bases may be subjected to biaxial bending moment due to seismic effects and wind force, and there is no possibility of manual analysis of column bases under the influence of axial force and biaxial bending moment in the AISC design guide 1, therefore, in this article, for the analysis of column bases against axial force and biaxial bending moment, a simple and effective method based on the principles and fundamentals used in the analysis of column bases against uniaxial bending moment has been used. According to this simple method, for the analysis of column bases against biaxial bending moment, it is possible to convert it to a column base with uniaxial bending moment based on the equations presented in this article, and then it can be analyzed based on the relationships used for the analysis of column bases against uniaxial bending moment. To determine the accuracy of the proposed method, modelling in ABAQUS software has been used. The modelling of the specimens under investigation in ABAQUS has been performed in such a way that the results obtained from the finite element method are consistent with the results obtained from the design guide equations of the AISC; so the approximate method presented in this research can also be used for the biaxial bending moment. The results of this research indicate that if the ratio of the smaller bending moment to the larger bending moment is between 5 to 30%, the results of the proposed method are very well aligned with the results obtained from the ABAQUS software and the difference is less than 5%. If the ratio of the smaller bending moment to the larger bending moment is more than 30%, the difference will be more than 5%; However, it is still conservative.
Keywords
Column Base
Anchor Bolt
Biaxial Bending Moment
Tension Force of Anchor
Numerical Modelling
Critical Eccentricity

Subjects

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  • Receive Date 25 April 2024
  • Revise Date 03 June 2024
  • Accept Date 04 July 2024