Abstract
Six welded H-section steel specimens subjected to the axial compressive load, the in-plane shear force and the resulting bending moment around the cross-section major axis are tested monotonically to investigate the elasto-plastic interactive buckling performances of beam-columns. The specimens are designed to fail due to local interactive buckling which is monitored by strain gauges and displacement meters. Strain curves and displacement curves varying with the shear force are illustrated, based on which the local interactive buckling is identified and the ultimate moment capacity of the specimen is extracted. The tests reveal that the local buckling of the web and flange in the compression zone occurs simultaneously resulting in the decrease of the ultimate moment capacity of the specimen. The normalized moment versus rotation curves are illustrated and compared in pairs to investigate the effects of the axial compression ratio, the flange width-thickness ratio and the web height-thickness ratio on the normalized ultimate moment capacity, which is defined as the ratio of the ultimate moment over the plastic moment. It is observed that the normalized ultimate moment capacity decreases remarkably as the axial compression ratio or the flange width-thickness ratio increases, but varies little as the web height-thickness ratio increases.
Highlights
H-section steel members are among the most widely used steel members composed of flat plates with advantages of economy, satisfactory performance, convenience of manufacture and fabrication, etc
The results have shown that plate width-to-thickness ratio and column slenderness ratio have significant influences on the buckling behavior and ultimate capacity of the column, and local buckling or local-overall interactive buckling may bring about the column failure
When the horizontal load F reaches approximately 75 kN for H2-0.2 and 90 kN for H4-0.2, respectively, the compressive strains begin decreasing and develop tensile strains, and the transverse displacements develop oppositely, both indicating that plate local buckling occurs within the web and flange in the compression zone, and the web and flange buckle simultaneously, which is identified as local interactive buckling
Summary
H-section steel members are among the most widely used steel members composed of flat plates with advantages of economy, satisfactory performance, convenience of manufacture and fabrication, etc. The experimental scheme is outlined, the experimental results and observations are summarized, and the effects of the axial compression ratio, the flange width-thickness ratio and the web height-thickness ratio on the normalized ultimate moment capacity of the beam-column are investigated.
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