A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Elastic and inelastic major-axis flexural buckling of cellular steel columns
Abstract This study investigates the elastic and inelastic major-axis flexural buckling of cellular steel columns. Based on the stationary principle of potential energy, the existing elastic buckling load equation is refined to incorporate the local bending deformations at web posts. The column strength curve for determining the critical loads is then derived. For the elastic buckling, the refinement provides a significant improvement. For the inelastic buckling, the effects of residual stresses and initial geometric imperfections on the column strength are examined by the validated nonlinear finite element (FE) models. The initial geometric imperfection amplitudes of L/300 and L/500, where L is the column length, are recommended for global buckling of cellular steel columns fabricated from the parent steel shapes with h/b ≤ 1.2 and h/b > 1.2, respectively, where h/b is the depth-to-width ratio of the parent steel shapes. The developed column strength curve conservatively predicts the major-axis flexural buckling strength of practical cellular steel shapes, with an average prediction-to-FE buckling stress ratio of 0.97. A comparison also shows that the current EC3 and AISC360 equations are applicable for predicting the strength of practical cellular columns, provided that the refined elastic buckling load is adopted.
Highlights The elastic buckling equation of cellular steel columns is refined to incorporate the local bending deformations. Neglecting local deformations may cause over-prediction as column slenderness or hole spacing-to-diameter ratio decreases. Nonlinear FE models incorporating initial geometric imperfection and residual stresses are validated with experimental data. A column strength curve for predicting the major-axis flexural buckling strength of cellular steel shapes is developed. EC3 and AISC360 equations, incorporating the refined elastic buckling load, can predict practical cellular column strength.
Elastic and inelastic major-axis flexural buckling of cellular steel columns
Abstract This study investigates the elastic and inelastic major-axis flexural buckling of cellular steel columns. Based on the stationary principle of potential energy, the existing elastic buckling load equation is refined to incorporate the local bending deformations at web posts. The column strength curve for determining the critical loads is then derived. For the elastic buckling, the refinement provides a significant improvement. For the inelastic buckling, the effects of residual stresses and initial geometric imperfections on the column strength are examined by the validated nonlinear finite element (FE) models. The initial geometric imperfection amplitudes of L/300 and L/500, where L is the column length, are recommended for global buckling of cellular steel columns fabricated from the parent steel shapes with h/b ≤ 1.2 and h/b > 1.2, respectively, where h/b is the depth-to-width ratio of the parent steel shapes. The developed column strength curve conservatively predicts the major-axis flexural buckling strength of practical cellular steel shapes, with an average prediction-to-FE buckling stress ratio of 0.97. A comparison also shows that the current EC3 and AISC360 equations are applicable for predicting the strength of practical cellular columns, provided that the refined elastic buckling load is adopted.
Highlights The elastic buckling equation of cellular steel columns is refined to incorporate the local bending deformations. Neglecting local deformations may cause over-prediction as column slenderness or hole spacing-to-diameter ratio decreases. Nonlinear FE models incorporating initial geometric imperfection and residual stresses are validated with experimental data. A column strength curve for predicting the major-axis flexural buckling strength of cellular steel shapes is developed. EC3 and AISC360 equations, incorporating the refined elastic buckling load, can predict practical cellular column strength.
Elastic and inelastic major-axis flexural buckling of cellular steel columns
Horsangchai, Voraphol (author) / Lenwari, Akhrawat (author) / Young, Ben (author)
Engineering Structures ; 301
2023-12-03
Article (Journal)
Electronic Resource
English
Weak-axis flexural buckling of cellular and castellated columns
| Elsevier | 2016
Weak-axis flexural buckling of cellular and castellated columns
| Online Contents | 2016
Weak-axis flexural buckling of cellular and castellated columns
| British Library Online Contents | 2016
Major-axis elastic buckling of axially loaded castellated steel columns
| Online Contents | 2009
Major-axis elastic buckling of axially loaded castellated steel columns
| Online Contents | 2009