Axial compression performance and finite element analysis of coal gangue ceramsite LAC filled PVC tube-steel wire mesh composite columns

In the present study, a novel composite column was introduced, which integrates polyvinyl chloride tube and steel wire mesh to confine coal gangue ceramsite concrete (PSCC), aiming to provide a more economical and efficient technical approach for practical engineering applications. The effects of different steel wire mesh layers and concrete strength grades on the axial compressive performance of PSCC has been investigated through experiments and finite element analysis. The findings indicated that the combination of polyvinyl chloride tube and steel wire mesh substantially enhanced the compressive strength and ductility of the concrete columns. Specifically, the peak stress and peak strain of C35 grade concrete confined by 3 layers of steel wire mesh were increased by 177 % and 307 %, respectively. Additionally, the C45 grade concrete confined by 3 layers of steel wire mesh exhibited relatively low rigidity degradation. The finite element analysis confirmed that the developed model accurately simulates the mechanical behavior of PSCC under axial compression. The accuracy of stability coefficient calculation formulas from existing literature and major specifications was evaluated, with the formula proposed in AISC 360-16 showing good agreement with the experimental data from this study. Ultimately, a bearing capacity calculation model was proposed based on experimental and finite element results, with an error margin of less than 5 %.