Abstract
This chapter experimentally investigates the behavior of 18 concrete-filled hollow structural steel (HSS) columns with or without fire protection after exposure to the ISO-834 standard fire subjected to axial or eccentric loads, and presents the results. The chapter develops a mechanics model for concrete-filled HSS columns after exposure to the ISO-834 Standard Fire, and is a development of the analysis used for ambient condition. The predicted load versus mid-span deflection relationship for the composite columns is in good agreement with test results. Based on the theoretical model, influence of the changing strength of the materials, fire duration time, sectional dimensions, steel ratio, load eccentricity ratios, and slenderness ratio on the residual strength index (RSI) is discussed. It is found that, in general, the slenderness ratio, sectional dimensions, and the fire duration time have a significant influence on the residual strength index (RSI). However, the steel ratio, the load eccentricity ratio, and the strength of the materials have a moderate influence on RSI. Finally, formulas suitable for incorporation into building code, for the calculation of the residual strength of the concrete-filled HSS columns after exposure to fire are developed based on the parametric analysis results.
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