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The structural behavior and residual capacity of S700 high strength steel circular hollow section (CHS) columns after exposure to elevated temperatures have been studied through testing and numerical modeling. The testing program was conducted on ten S700 high strength steel CHS columns and comprised heating and cooling of the specimens as well as post-fire material testing, measurements of initial geometric imperfections and pin-ended column tests. Numerical simulations were subsequently performed, where finite element models were built and validated with reference to the experimental results and afterward used to conduct parametric studies to obtain further numerical data. Given that there are no specific provisions for the design of steel structures after exposure to elevated temperatures, the relevant room temperature design buckling curves were evaluated, using post-fire material properties, for their applicability to S700 high strength steel CHS columns after exposure to elevated temperatures, based on the experimental and numerical data. The evaluation results indicated that the buckling curves prescribed in the American Specification and Australian Standard lead

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