‘IStructE Buckling Example’ provides a stiffness matrix and iterative buckling analyses for a 24-node/24-member/2-support double portal plane frame with 3 degrees of freedom. The example relates to the article ‘Buckling Matters II – Plane Frame Buckling Analysis’ in The Structural Engineer, 2025. Results given for bending, axial, shear forces and critical buckling load. Note - Excel file approximately 4 Mb.

Contents (13 pages)

• General Arrangement
• Methodology
• Input data
• Joint loads
• Member Loads
• Matrix Data Input Elastic
• Matrix Results Elastic
• Matrix Data Input Buckling
• Matrix & Results Buckling
• Buckling Results
• Hand Calculations