Adaptive boosting Axial capacity Concrete construction Corrosion resistance Decision trees Ensemble learning Fiber reinforced plastics Fiber-reinforced polymer rebar Fiber-reinforced polymers Fibre reinforced polymers Forecasting Gradient boosting Harmony search optimizations Load limits Loads (forces) Machine learning models Polymer rebars Regression analysis Reinforced concrete Reinforced concrete column Steel corrosion Steel fibers Support vector machines axial capacity ensemble learning fiber-reinforced polymer (FRP) rebar harmony search optimization machine learning reinforced concrete columns