Experimental investigation of load enhancement in composite columns using FRP wrapping and DIC technology, suggesting improved structural performance.
This study proposes a short column structure composed of lightweight aggregate concrete (LWC) filled aluminum alloy hollow tubes with dual‐layer FRP. Six axial compression tests were conducted, complemented by digital image correlation (DIC) technology, to systematically investigate strain distribution patterns during loading. Experimental results reveal that the failure modes of composite columns primarily manifest as aluminum alloy bulging and FRP rupture, with distinct bulging locations at end regions versus mid‐height sections. The composite configuration demonstrates remarkable load bearing enhancement, achieving 39.7%–102.6% capacity improvement compared to reference specimens. CFRP exhibits superior reinforcement efficiency over BFRP, with both FRP types showing more pronounced strengthening effects on LC20 concrete than LC30 counterparts (LC means lightweight aggregate concrete). Significant ductility improvement is observed, as evidenced by ductility coefficients of composite columns reaching 3.3–6.1 times those of plain concrete specimens. The predictive performance of various models for the load‐bearing capacity of composite columns was evaluated, and a new calculation model was proposed, which provides accurate predictions for LWC‐filled aluminum alloy columns wrapped with FRP.
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Zhao et al. (2026) studied this question.
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