考虑轴力效应下单切角梁承载性能研究OA

In steel structure buildings and bridges,the beam ends of secondary beams often need to be coped to align with the flanges of primary beams.Under seismic loads,wind loads,or temperature loads,axial forces may develop in secondary beams,affecting their structural performance.Systematic research on the performance of coped beams under axial forces is still lacking.Therefore,this study aims to investigate the performance of single-coped beams considering axial forces.Four full-scale single-coped beam specimens were designed and tested under static loading,and finite element analysis was conducted to provide an in-depth analysis of the specimens,focusing on the influence of axial forces in the coped region on the ultimate resistance.The results show that the failure mode of the specimens is local web buckling in the coped area.Axial compression intensifies the stress concentration in the coped region,leading to an increase in the principal compressive stress within the area.This makes the web more susceptible to buckling instability,thereby reducing the ultimate resistance of the coped beam.In contrast,axial tension alleviates the stress concentration in the coped region,reduces the principal compressive stress within the area,and enhances the ultimate resistance of the coped beam.Comparing the experimental data with the predicted values from existing calculation formulas for the ultimate resistance of single-coped beams reveals that existing formulas do not account for the effect of axial force on stress distribution and buckling mode in the coped area,leading to discrepancies between the predicted results and the experimental results.