Residual strength of concrete-filled RHS columns after exposure to the ISO-834 standard fire

摘要: The residual strength of a composite column may be used to assess the potential damage caused by fire and help establish an approach calculate structural protection for minimum post-fire repair. behavior six rectangular hollow steel (RHS) columns filled with concrete, or without protection, after exposure ISO-834 standard (ISO 834, 1975), subjected axial eccentric loads have been experimentally investigated results presented in this paper. Comparisons are made predicted strengths using existing codes such as LRFD-AISC-1994, AIJ-1997, EC4-1996 GJB4142-2000. It was found, general, that loss specimens protections significantly greater than protection. A mechanics model is developed paper concrete-filled RHS Standard Fire development analysis ambient condition (Han et al., 2001). load versus mid-span deflection relationship good agreement test results. Based on theoretical model, influence changing materials, duration time, sectional dimensions, ratio, eccentricity depth-to-width ratio slenderness index (RSI) discussed. found that, dimensions time significant (RSI). However, materials moderate RSI. Finally, formulas suitable incorporation into building code, calculation based parametric