Numerical analysis and experimental study on axial compressive behavior of glass sand concrete filled steel tubular short columns

To explore new avenues for solid waste utilization and energy conservation and emission reduction, waste glass was crushed, ground, and sieved to obtain waste glass sand, which was then used to replace fine aggregate and cement in concrete, respectively. Steel tube glass sand concrete short columns were fabricated, and subjected to axial compression tests, finite element simulation analysis, and theoretical calculations of bearing capacity. The study investigated the effects of waste glass sand replacement rates of 0%, 5%, 15%, 30%, and 60% on the mechanical performance of these axially loaded steel tube glass sand concrete short columns. The results show that: the failure mode of all fabricated steel tube glass sand concrete short columns was a bulging shape, and their ductility was higher than that of concrete-filled steel tube short columns without waste glass sand. When the waste glass sand replacement rate did not exceed 30%, the energy dissipation capacity of the steel tube glass sand concrete short columns was higher than that of those without waste glass sand. The axial bearing capacity calculated using the CECS28-2012 formula for steel tube glass sand concrete short columns had an error within 4%, while calculations using the Zhong Shantong formula provided higher accuracy and conservative prediction results for the axial bearing capacity of these columns.