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Cold-formed steel members filled with ultra-high-performance concrete (UHPC) have gained increasing attention in modern structural engineering due to their excellent mechanical performance, durability, and potential for lightweight, high-load-bearing applications. In particular, square cold-formed UHPC-filled dual steel stiffened slender columns consist of an outer cold-formed steel tube, an inner steel or stiffening element, and high-strength UHPC infill. The dual steel configuration provides improved confinement, enhanced local and global stability, and increased resistance to buckling, making these composite columns suitable for high-rise buildings, bridge components, protective structures, and other demanding environments.
Together, static and dynamic compression tests provide a comprehensive understanding of the mechanical performance of square cold-formed UHPC-filled dual steel stiffened slender columns. The results support the refinement of constitutive models, optimization of structural design, and development of engineering guidelines for both conventional and extreme-loading scenarios.
